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Torex XC9220/XC9221Series 16V Input Voltage Step-Down DC/DC Controller ICs. Manual

1. 100 VOUT 3 3V 90 VIN 5 0V 80 70 47 VIN 12V 60 50 40 30 PWM XC9220 20 uds PFM XC9221 10 0 0 1 1 10 100 1000 10000 Output Current IOUT mA XC9220 21x095xx Tr 2SJ646 SBD DE5PC3 CDRH 127 10uH CIN 10uF ceramic CL 44uF ceramic RSENSE 50mohm VOUT 3 3V 3 7 VIN 5 0V 35 12V 3 1 2 9 PWM XC9220 PFM XC9221 27 0 1 1 10 100 1000 10000 Output Current IOUT mA XC9220 21x095xx Tr 2SJ646 SBD DE5PC3 CDRH 127 10uH CIN 10uF ceramic CL 44uF ceramic RSENSE 50mohm VOUT 3 3V 100 90 9221 70 60 50 40 VIN 5 0V 30 viN 12V 20 1 10 100 1000 Output Current IOUT mA 10000 XC9220 XC9221 B YPICAL PERFORMANCE CHARACTERISTICS Continued 4 FB Voltage Temperature Characteristics 1 00 0 95 0 90 0 85 FB Voltage VFB V 0 80 6 Input 50 40 30 20 Supply Current IDD uA XC9220 21 Series VIN 5V 1 00 0 95 0 90 0 85 FB Voltage VFB V 0 80 50 25 0 25 50 15 100 Ambient Temperature Ta C Voltage Temperature Characteristics XC9220 21 Series VIN 5V Fosc 300k 500kHz 50 40 _ 30 20 Supply Current IDD uA 10 50 25 0 25 50 75 100 8 Oscillation Frequency Temperature Characteristics 550 T 525 P 500 LL gt
2. 200kQ NOTE 1 Internal soft start time In case where the U V L O function operates temporarily due to the power cutoff etc when an external CSS is charged VCE22 6V the IC restarts operation by the internal soft start time Minimum value of soft start time set externally is equal to the internal soft start time 2 EFFI output voltage x output current input voltage x input current x 100 3 The integral latch and short circuit protection do not function when the CE CSS pin voltage become lower than 2 6V while the soft start time 4 No Integral protection function is available with the XC9220 XC9221 D series Refer to the CHARACTERISTICS CHART BY OSCILLATION FREQUENCY MCHARACTERISTICS CHART BY OSCILLATION FREQUECY VESTEM SupyCumm2 w 25 5 25 so 4 9 ssf 2 fo 8 TOIREX 9 22 XC9220 XC9221 series MTYPICAL APPLICATION CIRCUITS VIN CE Pch MOSFET E e External Components Pch MOSFET 2SJ646 SANYO SBD DE5PC3 SHINDENGEN L CDRH8D28 4R7 4 7 H SUMIDA fosc 1 0MHz CDRH8D43 100 10 H SUMIDA fosc 500kHz CDRH127 220 22 H SUMIDA fosc 300kHz CIN 47 u F OS CON SANYO CL 47 u F OS CON SANYO z Hd ONS BOPERATIONAL EXPLANATION The XC9220 XC9221 series consists of a reference voltage source ramp wave circuit error amplifier PWM comparator phas
3. 475 c gt o 450 LL 425 400 Ambient Temperature Ta XC9220 21x095xx VIN 5V 2 8 2 6 2 4 2 2 UVLO Voltage VUVLO V 2 0 50 25 0 25 50 15 100 50 Ambient Temperature Ta 5 FB Voltage vs Input Voltage XC9220 21 Series Series Se Ta 85 C 25 C 40 C 4 6 8 10 12 14 Input Voltage VIN V 7 Supply Current vs Input Voltage XC9220 21 Series 16 Fosc 300k 500kHz Ta 85 C 25 C 40 C 2 4 6 8 10 12 14 Input Voltage VIN V XC9220 21Series 9 U V L O Temperature Characteristics 16 UVLO R elease L l UVLO Detect 25 0 25 50 75 Ambient Temperature Ta 100 TOIREX 15 22 XC9220 XC9221 series E PERFORMANCE CHARACTERISTICS Continued 11 EXT L ON Resistance Characteristics 10 EXT H ON Resistance Characteristics XC9220 21 Series 30 I 25 4 20 pr Ta 85 C 15 p 5 40 C 40 I x 5 LU 0 0 2 4 6 8 10 12 14 16 Input Voltage VIN V 11 Soft Start Time Temperature Characteristics XC9220 21 Series VIN 5V Fosc 300k 500kHz 8 0 7 0 6 0 5 0 Soft Start Time TSS msec 3 0 2 0 50 25 0 25 50 15 10
4. EXT The dissipation pad for the USP 6C package preliminary should be solder plated in recommended mount pattern and metal masking so as to enhance mounting strength and heat release f the pad needs to be connected to other pins it should be connected to the Vss No 5 pin CE CSS VSS FB SOT 25 USP 6C TOP VIEW BOTTOM VIEW ASSIGNMENT rediens PIN NAME FUNCTION SOT 25 USP 6C 6 Crip Enable Soesan 3 4 FB _______ 4 3 EX 1 ternal Transistor Drive 0 2 NoComedon 8 1 Power Supply MPRODUCT CLASSIFICATION Ordering Information 9220 5 PWM control 9221 4 2 3 4 6 6 7 09 PWM PFM automatic switching control Type of DC DC Controller ICs rd Oscillation Frequency SOT 25 3 000 Reel SOT 25 3 000 Reel ER USP 6C 3 000 Reel USP 6C 3 000 Reel Packages Order Unit The G suffix denotes Halogen and Antimony free as well as being fully RoHS compliant 2 22 XC9220 XC9221 Series DIAGRAMS QXC9I220 21A and C series XC9220 21B and D series Each circuit Each circuit vss CE CSS ip Enable HP to vss Diodes inside the circuits are ESD protection diodes and parasitic diodes FUNCTIONS CHIP ENABLE I
5. depend on values of input voltage load current coil and so on 6 22 7 XC9220 XC9221 Series B OPERATIONAL EXPLANATION Continued UVLO Under Voltage Lock Out gt When the input voltage becomes 2 3V or lower the external P channel driver transistor is forced OFF Once the UVLO operates the XC9220 XC9221A and C series soft start internally set type resets the internal circuit For this by releasing the UVLO function the IC performs the soft start function to initiate output startup operation When the input voltage falls because of a power cutoff etc and the IC stops operation due to the UVLO function the IC resumes its operation by internal soft start circuit of the XC9220 XC9221B and D series f the soft start time is needed to set externally the CE Css pin voltage should be reset to OV Please see the soft start circuit example UVLO Operation U V L O operation VIN U V L O InternalSignal VOUT XC9220 21A and C series XC9220 21B and D series E U V L O U V L O release delay release delay Soft start time Tss1 Soft start time Externally set up Tss2 Soft start time Tss1 Soft Start Time The XC9220 XC9221B and D series can adjust the soft start time externally via the CE pin The soft start function operates until the CE pin voltage becomes 2 6V Please refer to the following equation
6. et A 4 e 0 4 3 la t ar 1 x May 79 2008 0010 XC9220 XC9221 Series IE PACKAGING INFORMATION SOT 25 Unit mm USP 6C Unit mm 18 0 05 TOIREX ES 19 22 XC9220 XC9221 series E PACKAGING INFORMATION Continued USP 6C Reference Pattern Layout USP 6C Reference Metal Mask Design 0 5 0 5 20 22 a oI O OoOo XC9220 XC9221 Series MARKING RULE 9301 25 D represents product series MARK PRODUCT SERIES Enn enn _______ 9221 2 represents product types 507 25 TOP VIEW m Soft start internally set with integral protection function 922 NN Soft start externally set with integral protection function XC922xB ooxx Soft start internally set without integral protection function 922 NE a Soft start externally set without integral protection function XC922xDxxxxx 3 represents oscillation frequency MARK OSCILLATION FREQUENCY PRODUCT SERIES 300kHz XC922xxxx3xx 500kHz 922 5 922 4 represents production lot number Oto 9 Ato Z and inverted 0 to 9 A to Z repeated 1 J W excluded USP 6C D represents product series MARK PRODUCT SERIES 9220 9221 2 represent product types B Sofestar externally set with integral protection function _XC922xBx00x
7. for calculating the soft start time Minimum soft start time is equal to the time set internally TSS CSS x RSS x In VCE 2 2 VCE Internal sotf starttime Tss1 XC9220 21A series XC9220 21A series a Externallyset mes soft starttime Tss2 CE CSS PIN XC9220 21A series XC9220 21B series p Minimum soft starttime when externally set Tss2_min Tss1 gt Circuit Example1 N ch Open Drain gt Circuit Examle2 CMOS logic low current dissipation gt Cicuit Examle3 CMOS logic low current dissipation quick off VCE VCE VCE ON OFF Signal ON OFF Signal ON OFF CE CSS Signal PIN CE CSS PIN CE CSS PIN li TOIREX 7122 XC9220 XC9221 series E OPERATIONAL EXPLANATION Continued lt Protection Circuits gt 1 Integral Protection Circuit Latch Type In the circuit of the 9220 9221 A and B series the more load current becomes larger the duty of the EXT pin gradually expands and the duty reaches maximum EXT L When the MAXDUTY state continues a certain amount of time TPRO the EXT pin holds high level latching and keeps the P ch output driver transistor in OFF state resuming the operation from the latching state please turn off the IC via the CE pin or apply the input voltage again operates UVLO function and release The latching state does not mean a complete shutdown but a state in which pulse output is susp
8. within the specified ranges Should you wish to use the products under conditions exceeding the specifications please consult us or our representatives We assume no responsibility for damage or loss due to abnormal use All rights reserved No part of this datasheet may be copied or reproduced without the prior permission of TOREX SEMICONDUCTOR LTD TOREX SEMICONDUCTOR LTD 22 22
9. 0 Ambient Temperature Ta C 12 Integral Protection Time Temperature Characteristics XC9220 21A B Series VIN 5V Fosc 300k 500kHz _ 20 o o E o 1 6 e 49 eS R 9 0 8 9 a 8 5 0 4 0 0 50 25 0 25 50 75 100 Ambient Temperature Soft Start Time TSS msec EXT L Resistance REXTBL Q Integral Protection Time Tpro msec XC9220 21Series 0 2 4 6 8 10 12 14 16 Input Voltage VIN V XC9220 21Series VIN 5V Fosc 1 0MHz 50 25 0 25 50 15 100 1 0 0 8 0 6 0 4 0 2 Ambient Temperature Ta XC9220 21A B Series VIN 5V Fosc 1MHz 50 25 0 25 50 75 100 Ambient Temperature 16 22 ze XC9220 XC9221 Series B PERFORMANCE CHARACTERISTICS Continued 13 Short Circuit Protection Temperature Characteristics XC9220 21 Series VIN 5V 0 8 0 7 Short Protection Voltage Vshort V 50 25 0 25 50 75 100 Ambient Temperature 15 CE Threshold Temperature Characteristics XC9220 21 Series VIN 5V CE Voltage VCEH VCEL V CE Voltage VCEL V m m 50 25 0 25 50 75 100 Ambient Temperature 14 Short Circuit Protection Volta
10. 1 series MTYPICAL PERFORMANCE CHARACTERISTICS 1 Efficiency vs Output Current XC9220 21x095xx Efficiency EFFI 96 Output Voltage VOUT V 100 25 646 SBD DE5PC3 CDRH127 10uH CIN 10uF ceramic CL 44uF ceramic RSENSE 50mohm VIN 12V gt VOUT 5V me PWM XC9220 PFM XC9221 10 100 1000 10000 Output Current IOUT mA 2 Output Voltage vs Output Current XC9220 21x095xx Tr 2SJ646 SBD DESPC3 CDRH127 10uH CIN 10uF ceramic CL 44uF ceramic RSENSE 50mohm VIN 12V gt VOUT 5V 5 4 5 2 50 M 4 8 4 6 PWM XC 9220 lach di ala a fae PFM XC 9221 4 4 0 1 1 10 100 1000 10000 Output Current IOUT mA 3 Output Ripple Voltage vs Output Current Ripple Voltage Vr mV 14 22 XC9220 21x095xx Tr 28J646 SBD DE5PC3 CDRH127 10uH CIN 10uF ceramic CL 44uF ceramic RSENSE 50mohm VIN 12V gt VOUT 5V 100 80 PWM XC9220 p PFM XC 9221 60 40 20 iy 0 1 1 10 100 1000 10000 Output Current IOUT mA Output Voltage VOUT V Efficiency EFFI 96 Ripple Voltage Vr mV XC9220 21x095xx Tr 2SJ646 SBD DE5PC3 CDRH127 10uH CIN 10uF ceramic CL 44uF ceramic RSENSE 50mohm
11. C OPERATION PRODUCT TYPE E SE Integral protection function WE ABSOLUTE MAXIMUM RATINGS Ta 25 C J Power Dissipation mW USP C 6 ko YN TI Operating Ambient Temperature 40 85 Storage Temperature 59 125 TOIREX 3 22 XC9220 XC9221 series MELECTRICAL CHARACTERISTICS XC9220 XC9221 A and C series 25 8 1 5 9 91 8 v 2 Input Voltage Range UVLO Voltage VUVLO Minimum Operating Voltage Supply Current 2 VIN 5 0V FB 1 0V RUE NET RUN Connected to external components Maximum Duty Rato MAXDTY pwo po 2 EXT HighOnResistane REXTBH 6 40 6 Q pan EXT LowOnResistance REXIBL 1 1 1 1 6 12 2 4 Int k tion Ti ntegral Protection lime XC9220 9221 A series wee L Satan mme Oscillation Frequency Efficiency 1 EFFI 92 3 FB Voltage AVFB ppm 0 100 2 Temperature Characteristics ATopr VFB CE High Level Voltage CE Low Level Voltage km fa wa ft CE Low Level Current VIN 16V CE OV FB High Level Current Lem ai FB Low Level Current IFBL VIN 16V FB OV 0 1 0 1 UA Unless otherwise stated VIN 5 0V NOTE 1 EFFI output voltage x output current input voltage x input
12. D Sofestatextemaly set without integral protection function XC922xDxoxoo 3 4 represents FB voltage FB VOLTAGE PRODUCT SERIES 0 9 O0S9Vfied 922 09 5 represents oscillation frequency MARK OSCILLATION FREQUENCY PRODUCT SERIES 300kHz XC922xxxx3xx 500kHz XC922xxxx5xx A XC922xxxxAxx 6 represents production lot number Oto 9 Ato Z repeated 1 J Q W excluded No character inversion used TOIREX 21 22 9220 9221 series The products and product specifications contained herein are subject to change without notice to improve performance characteristics Consult us or our representatives before use to confirm that the information in this datasheet is up to date We assume no responsibility for any infringement of patents patent rights or other rights arising from the use of any information and circuitry in this datasheet Please ensure suitable shipping controls including fail safe designs and aging protection are in force for equipment employing products listed in this datasheet The products in this datasheet are not developed designed or approved for use with such equipment whose failure of malfunction can be reasonably expected to directly endanger the life of or cause significant injury to the user e g Atomic energy aerospace transport combustion and associated safety equipment thereof Please use the products listed in this datasheet
13. TOIREX ETRO511 011 XC9220 XC9221 series 16V Input Voltage Step Down DC DC Controller ICs MGENERAL DESCRIPTION The XC9220 XC9221 series is a group of multi purpose step down DC DC controller ICs ICs enable a high efficiency stable power supply with an output current up to 3A to be configured using only a transistor a coil a diode and two capacitors connected externally Low ESR capacitors such as a ceramic capacitor can be used as an output capacitor The XC9220 XC9221 series has 0 9 1 5 reference voltage and using externally connected resistors the output voltage can be set freely With an internal switching frequency of 300kHz and 500kHz 1 0MHz small external components can also be used The XC9220 series is PWM control and the XC9221 series is PWM PFM mode which automatically switches from PWM to PFM during light loads and high efficiencies can be achieved over a wide range of load conditions As for the soft start time the XC9220 XC9221A and C series is internally set to 4msec and the XC9220 XC9221B and D series can be externally set up With the built in UVLO Under Voltage Lock Out function the external P channel driver transistor is forced OFF when input voltage becomes 2 3V or lower B APPLICATIONS MFEATURES Operating Voltage Range 2 8V 16 0V top boxes Dub Vin Externally Set Range 1 2V or more Digital TVs Vep 0 9V 1 5 DVD HDD recorders Output Current Less than 3 0A l l Oscillatio
14. current x 100 2 No Integral protection function is available with the XC9220 9221 C series Refer to the CHARACTERISTICS CHART BY OSCILLATION FREQUENCY 4 22 XC9220 XC9221 Series MELECTRICAL CHARACTERISTICS Continued XC9220 XC9221 B and D series Ta 25 1 ve __________________ 5 v 2 Input Voltage Range UVLO Voltage VUVLO Minimum Operating Voltage Supply Current 2 VIN 5 0V FB 1 0V ae NET UN NI Connected to external components Maximum Duty Rato MAXDTY poo 2 EXT HighOnResistane REXTBH 6 40 6 4 EXT LowOnResistance REXIBL 26 12 4 Int li tion Ti megral Protectan Time XC9220 9221 B series aea wee 2 6s AL 50 100 200 m 5 Oscillation Frequency Internal Soft Start Time 1 155 CE VIN Efficiency 2 CT 3 FB Voltage XE ppm TES 100 Temperature Characteristics ATopr VFB VFB PC CE High Level Volt 0 _ E ED CE Low Level Voltage pe a p p 2 High Level Current ___ 160 0 1 O1 gA 1 CE Low Level Current Ice 16 0 _ 014 01 uA 1 FB High Level Current M MEE ME FB Low Level Current 0 1 01 4 Unless otherwise stated VIN 5 0V External components 55 0 1 F RSS
15. e compensation circuit protection circuits UVLO circuit and others The series ICs compare using the error amplifier the voltage of the internal voltage reference source with the feedback voltage from the Vour pin through split resistors Phase compensation is performed on the resulting error amplifier output to input a signal to the PWM comparator to determine the turn on time during PWM operation The PWM comparator compares in terms of voltage level the signal from the error amplifier with the ramp wave from the ramp wave circuit and delivers the resulting output to the buffer driver circuit to cause the EXT pin to output a switching duty cycle This process is continuously performed to ensure stable output voltage Reference Voltage Source The reference voltage source provides the reference voltage to ensure stable output voltage of the DC DC converter lt Oscillator gt The oscillator determines switching frequency The frequency is fixed internally and can be selected from 300kHz 500kHz and 1 0MHz Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation and to synchronize all the internal circuits lt Error Amplifier gt The error amplifier is designed to monitor output voltage The amplifier compares the reference voltage with the feedback voltage FB pin voltage divided by the internal split resistors When a voltage lower than the reference voltage is fed back the output voltage of t
16. ended therefore the internal circuitry remains in operation However the integral protection circuit uses the MAXDUTY as a trigger for its operation it suspends the pulse output no matter what dropout voltage decreases For the specification including small dropout voltage the XC9220 XC9221 C or D series which do not have the integral protection function are recommended Integral protection circuit SESI SE SE SE SESI SE SESI SE SE SO SE SE SE SSI SO LISE LO SE OS RSSICON PI TITIS KISA vot di 7060606 Waveform o oah TORONTE R rs Tpro Integral Protection Circuit n Delay Time Internally set 4 5 n Protection circuit operates and Ton lt Ton Tpro Output shut down 2 Short Circuit Protection Circuit Latching Type When the FB pin is shorted to the Ground or the output voltage drops rapidly because of over load state etc the P ch driver transistor is kept OFF as in the case with the integral protection circuit The protection circuit operates when the FB voltage becomes 0 7V or lower For releasing the latching state the circuit is needed to restart via the VIN or the CE pin Short circuit protection circuit EBVONKAagE ee VREF Less than 100usec Not latching Soft start time Tss x 90 About 100 to 200usec delay time is set to avoid latching w hen instantaneous transient response dro
17. ending on the setting output voltage as the chart below OUTPUT VOLTAGE RSENSE mQ Vour 2 5V gt 25 VIN External Components gt P ch MOSFET 25646 SANYO SBD DE5PC3 SHINDENGEN L CDRH8D28 4R7 4 7 u H SUMIDA fosc 1 0MHz CDRH8D43 100 10 H SUMIDA fosc 500kHz CDRH127 220 22 H SUMIDA fosc 300kHz CIN 224 F ceramic CL 224 F ceramic fosc 1 0MHz 500kHz 47 F ceramic fosc 300kHz 100mQ VouTS2 5V 50mQ gt 2 5V INO 32 TOIREX 9 22 XC9220 XC9221 series OPERATIONAL EXPLANATION Continued Setting of Coil Value Recommended inductance value of coil by oscillation frequency is shown in the chart below fosc kHz L 4 H 500 1000 However the more current change in each pulse becomes larger the more output ripple voltage becomes higher when dropout voltage is high This may lead to instability In this case increasing the coil inductance value will make AC small and it makes output stable lpk VIN Vour x Vour VIN x L x fosc L Coil inductance value fosc Oscillation frequency Please do not exceed the coil rating Coil peak current is determined by the following equation lpk lour AC 2 IOUT Output Current IL Current flow through coil Ipk Peak Current Amount of coil current change in each pulse 10 22 XC9220 XC9221 Series MNOTES ON USE 1 T
18. ge vs Input Voltage XC9220 21 Series 0 8 0 7 Short Protection Voltage Vshort V 0 2 4 6 8 10 12 14 16 Input Voltage VIN V 16 CE Threshold vs Input Voltage XC9220 21 Series 0 2 4 6 8 10 12 14 16 Input Voltage VIN V TOIREX ES 17 22 XC9220 XC9221 series PERFORMANCE CHARACTERISTICS Continued 17 Load Transient Response Characteristics XC9220x095xx 500kHz PWM Control lt External Components gt Tr 2899616 SANYO SBD D1FH3 SHINDENGEN L 10 CDRH8D43 SUMIDA 47 u F OS Con CL 47 F OS Con Olout 0 1mA 1000mA VIN 5 0V VOUT 3 3V VouT 100mV div Time 50 s div a ee ee ia b ee ee ee ee eee ep ee ET 1 sa i ca Fres Bip Wi L haw zs Miass 18543 man AF Olout 0 1mA 1000mA VIN 10 0V VouT 3 3V Vour 100mV div Time 50 u s div 2 avan ti m sav 5008 25099 C Ome ov 5 jean a Depped ma av ou Moy 79 2008 ce OIOUT 300MA 23000mA VIN 10 0V 3 3 100 50 s div VIN 5 0V VOUT 3 3V VouT 100mV div Time 10ms div e e 4 4 A 0 0 A AD b b 6_4_ O A O A W W e AM t AH 0_ W d b H ba 6 A a e
19. he XC9220 XC9221 series designed for use with an output ceramic capacitor If however the potential difference between input and output is too large a ceramic capacitor may fail to absorb the resulting high switching energy and oscillation could occur on the output If the input output potential difference is large connect the output capacitor with large performance to compensate for insufficient capacitance 2 Spike noise and ripple voltage arise in a switching regulator as with a DC DC converter These are greatly influenced by external component selection such as the coil inductance capacitance values and board layout of the external components Once the design has been completed verification with actual components should be done 3 When the difference between input voltage and output voltage is large in PWM control and the load current is light very narrow pulses will be outputted and there is the possibility that some cycles my be skipped completely 4 When the difference between input voltage and output voltage is small in PWM control and the load current is heavy very wide pulses will be outputted and there is the possibility that some cycles my be skipped completely 5 When using the pin by pulling up to the Vin pin please be noted to the rising time of the Vin pin voltage If the rising time of the Vin pin voltage is much slower than the soft start time of the XC9220 XC9221 series the short protection circuit starts to
20. he error amplifier increases The gain and frequency characteristics of the error amplifier output are fixed internally to deliver an optimized signal to the PWM comparator Control Methods The XC9220 series is PWM control and the XC9221 series is PWM PFM automatic switching mode In the XC9220 series it is controlled at a constant frequency from light load to heavy load When a noise etc is concerned it is easy to set up a filter etc since the frequency is fixed the other hand the efficiency at the time of light load may fall In the XC9221 series the high efficiency be drawn from control at the time of light load In PWM PFM automatic switching mode a control method is automatically changed from PWM control to PFM control at the time of light load If coil current becomes discontinuous at the time of light load ON time duty intends to reduce less than 25 Therefore the circuit operates to output the pulse which ON time duty fixed to 2596 from the EXT pin ON time duty is fixed when PFM operation The pulse is outputted with the cycle suitable for the conditions at that time In order that the number of times of switching per unit time may decrease the efficiency which it is at the light load time is improved However output cycle of the pulse cannot be fixed For this the circuit should be designed with this point in mind when using a noise filter etc conditions shifting to the operation is
21. n Frequency 300kHz 500kHz and 1 0MHz Q Portable information terminals Control Methods PWM control XC9220 Notebook computers PWM PFM automatic switching XC9221 Soft Start Function 4ms internally set XC9220 XC9221A 500kHz Externally set XC9220 XC9221B Protection Circuits Integral protection 1 0 ms XC9220 XC9221 Aand B series Short circuit protection Low ESR Capacitor Compatible Ceramic capacitor Operating Ambient Temperature 40 C 85 C Packages SOT 25 USP 6C Environmentally Friendly EU RoHS Compliant Pb Free APPLICATION CIRCUIT PERFORMANCE CHARACTERISTICS Efficiency vs Output Current VIN XC9221A095MR VOUT 3 3V FOSC 500kHz CIN 47 F OS Con CL 47 u F OS Con CE Pch L 10 H CDRH8D43 SUMIDA PchMOSFET CPH3308 SANYO CDD 1 0 uF ceramic 109 gt MOSFET n pistons 90 VIN 5 0V for ceramic CL yourt TIBI LAT 80 7 gt TO MS Ll HEH 42 60 vat VIN 16 0V VIN 12 0V 50 vu o 5 40 4 30 y pe 20 Fa RSENSE Tantalum and electrolytic capacitors can be used in w hich case 10 RSENSE becomes unnecessary 0 0 1 1 10 100 1000 10000 Output Current IOUT mA 1 22 XC9220 XC9221 series EPIN CONFIGURATION VIN
22. operate so that the output may not rise f you are using the A or the C series please use a voltage detector or something similar in order to check that the input voltage rises fully Then start the series via the CE pin If you don t want to use an additional detector in this way we recommend that you use the B or D series adjusting the soft start period externally so that the voltage at the Vin pin rises fully before the soft start period is completed VIN Pin Voltage ARising time of the VIN pin voltage Soft Start Time Releasing of the VIN pin vallage gt gt Soft Start Time Normal Operation FB Pin Voltage Because the VIN pin voltage is low and the FB pin valtage i amp nat reached t the short protection voltage at the time the soft Start Time s ft start time completes the output turns out to be OFF by 2msec TYP the short protection operation fosc 1 MHE Short protection function starts 6 Use of the IC at voltages below the recommended minimum operating voltage may lead to instability 7 This IC and external components should be used within the stated absolute maximum ratings in order to prevent damage to the device 8 For temporary transitional voltage drop or voltage rising phenomenon the IC is liable to malfunction should the ratings be exceeded 9 Torex places an importance on improving our products and their reliability We request that users incorp
23. orate fail safe designs and post aging protection treatment when using Torex products in their systems TOIREX ES 11 22 XC9220 XC9221 series NOTES ON USE Continued Q Instructions on Pattern Layout 1 Wire external components as close to the IC as possible and use thick short connecting traces to reduce the circuit impedance Please pay special attention to the strengthening of Vin and Vss wiring Switching noise which occurs from the GND may cause the instability of the IC For that matter it is recommended to connect Rin about 109 and Cpp about 1 u F to the Vin pin if Vin voltage is high and noise is high Board layout when XC9220 XC9221 series is mounted with external components ed x Ceramic Capacitor 9220 21 Schottky Barrier Diode Inductor Resistor M Low value resistor ES gt o 12 22 EEST CIRCUITS Circuit 1 Supply Current Stand by Current CE Current Circuit 3 Oscillation Frequency PFMDUTY UVLO Efficiency Circuit 4 EXT On Resistance FB Current XC9220 XC9221 Series Circuit 2 FB Voltage Integral Protection Short Circuit Soft Start MAXDUTY CE Voltage VIN 55 ola 274 CIN 1uF 1 4 TUH Fosce1 0MHz L 1OuH Fosc 500kHz L 22uH Fosc z300kHz Circuit 5 Soft Start Externally set B and D series CIN 1uF TOIREX 13 22 XC9220 XC922
24. p 100 usec Protection circuit does not operate 8 22 MM XC9220 XC9221 Series BOPERATIONAL EXPLANATION Continued Q Output Voltage Setting Output voltage can be set by adding split resistors Output voltage is determined by the following equation based on the values of RFB1 and RrB2 The sum of RFB1 and RFB2 should normally be 1 9 or less VOUT 0 9 x RFB1 RFB2 RFB2 The value of CFB speed up capacitor for phase compensation should be adjusted by the following equation Fzfb should usually be 5kHz Adjustments are required from 1kHz to 20kHz depending on the application value of inductance L and value of load capacity C CFB 1 2 x RFBI x fzfb Sample calculation Setting 3 3V Vour RFB1 200k 2 RFB2 75k 4 VOUT 0 9 x 200k 75k 75k 3 300V CFB 1 2 x mx 200k x 5k 2150pF Typical examples VOUT RFB1 RFB2 CFB VOUT RFB1 RFB2 CFB pF 150 29 220 220 Recommended MOSFET SBD Examples a Schottky ten Diode D1FH3 2 d to use P ch or Ciss less than 1500pF 2 SBD should be used with high toned reverse characteristics Ceramic Capacitor With the XC9220 9221 series a ceramic capacitor can be used as an output capacitor RSENSE resistor is required for using the ceramic capacitor The value of RSENSE resistor is determined dep

Torex XC9220/XC9221Series 16V Input Voltage Step-Down DC/DC Controller ICs. Manual

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