ST STOD1317B handbook
Contents
1. um 1 55 Ahead do Ir 3d 1 2 3 4 5 6 0 45 te 20 22 Doc ID 022607 Rev 1 ST STOD1317B Revision history Revision history Document revision history Table 7 Date Revision 19 Dec 2011 1 lnitial release Changes Doc ID 022607 Rev 1 21 22 STOD1317B Please Read Carefully Information in this document is provided solely in connection with ST products STMicroelectronics NV and its subsidiaries ST reserve the right to make changes corrections modifications or improvements to this document and the products and services described herein at any time without notice All ST products are sold pursuant to ST s terms and conditions of sale Purchasers are solely responsible for the choice selection and use of the ST products and services described herein and ST assumes no liability whatsoever relating to the choice selection or use of the ST products and services described herein No license express or implied by estoppel or otherwise to any intellectual property rights is granted under this document If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or service2. ky7 STOD1317B 170 mA 13 V high efficiency boost converter LDO Features m Operating input voltage range from 2 6 V to 4 8 V 1 output voltage tolerance Low output ripple True shutdown Short circuit protection Digital low power function Very high efficiency at light load thanks to pulse skipping operation Very fast line and load transients 1 2 MHz switching freguency 1 HA max guiescent current DFN12L 3 x 3 x 0 8 mm Applications m Single rail AMOLED display m Cellular phones m Battery powered equipment Description The STOD1317B is a fixed frequency high efficiency boost DC DC converter with cascaded LDO able to provide output voltages ranging from 6 V to 13 V starting with an input voltage from 2 6 V to 4 8 V The device is designed to supply loads that are very sensitive to output ripple such as AMOLED display panels A dedicated LDO is able to suppress any ripple and noise coming out from the DC DC converter The LDO works with a constant drop in order to maintain high efficiency in the whole operating range The low Rpson N channel and P channel MOSFET switches are Table 1 Device summary Nf NG DFN12L 3 x 3 mm integrated and contribute to achieving high efficiency The true shutdown feature allows physical disconnection of the battery from the load when the device is in shutdown mode The control technique is able to maintain efficiency higher than 85 at light
3. VINMIN 2x Vmip xfs xL where Vwip step up output voltage it is fixed internally to Vour 0 38 V lout output current Vin input voltage of the STOD1317B fs switching frequency Use the minimum value of 1 MHz for worst case n efficiency of the step up converter 0 80 at maximum load Input and output capacitor selection It is recommended to use ceramic capacitors with low ESR as input and output capacitors in order to filter any disturbance present in the input line and to obtain stable operation of the step up converter and LDO A minimum real capacitance value of 3 uF must be guaranteed for Cyjp and Cour in all conditions Recommended PCB layout The STOD1317B is a high frequency power switching device so it requires a proper PCB layout in order to obtain the necessary stability and optimize line load regulation and output voltage ripple The input capacitor must be as close as possible to the Vj pin In order to minimize the ground noise a common ground node for power ground PGND and a different one for analog ground GND must be used The exposed pad is connected to PGND through vias Grounding is fundamental to the operation of DC DC converters run separate ground paths for critical parts of the circuit GND and Power GND each connected back to a single ground point Separate ground lines prevent the current and noise of one component from interfering with other components If using a ground plane utilize
4. split plane techniques to give effective grounding Use multiple vias to decrease the trace impedance to ground Doc ID 022607 Rev 1 ky STOD1317B Application information Figure 12 Ground schematic V routing the incoming and the outgoing Do not track are not connected to each This track can be longer other but only to the capacitor pad In fact we add here an inductor Via wich dives into the power supply plane that creates a second order filter with the CoHF Vout We add here an impedance that lowers the resonating frequency of Start from the component pad and not the incoming track Via wich dives into SI the ground plane 100nF 30nH via 100nF 10nH 100nF inH 16MHz Co HF resonating frequency Such isolation is necessary to prevent high level switching currents from returning to the battery or other power supply through the same ground return path as the analog signals If that happens the ground path of those sensitive signals is disturbed the high level switching currents flowing through the ground s resistance and inductance cause the voltage along the return path to vary In addition to the grounding scheme proper placement of the regulator s components is important Beginning a new layout for the reasons above it is necessary to firstly place the capacitors Cin Cout and Cwip as close as possible to the related device pins After that it is pos
5. the Vour pin Undervoltage lockout and soft start guarantee proper operation during startup BOOST multiple mode of operation The boost DC DC operates in three different modes pulse skipping PS discontinuous conduction mode DCM and continuous conduction mode CCM It switches automatically between the three modes according to input voltage output current and output voltage conditions Pulse skipping operation The STOD1317B works in pulse skipping mode when the load current is below some tens of mA The load current level at which this way of operation occurs depends on the input and output voltage Discontinuous conduction mode When the load increases above some tens of mA the STOD1317B enters DCM operation In order to obtain this type of operation the controller must avoid the inductor current going negative The discontinuous mode detector DMD block senses the voltage across the synchronous rectifier and turns off the switch when the voltage crosses a defined threshold which in turn represents a certain current in the inductor This current can vary according to the slope of the inductor current which depends on input voltage inductance value and output voltage Continuous conduction mode At medium high output loads the STOD1317B enters full CCM at constant switching freguency mode Doc ID 022607 Rev 1 11 22 Detailed description STOD1317B 6 2 6 3 6 4 6 5 12 22 Enable pin The device oper
6. 4 000 eee 14 7 1 External passive components 14 7 1 1 Inductor selection 14 7 1 2 Input and output capacitor selection 14 7 2 Recommended PCB layout 14 8 Package mechanical data 17 9 Revision history eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee 21 2 22 Doc ID 022607 Rev 1 ky STOD1317B Schematic 1 Schematic Figure 1 Application schematic STODO1317B vour VO SET FB Table 2 Typical external components Comp Manufacturer Part number Value Ratings Size MURATA GRM219R61A106KE44 410 X5R 10V 0805 Cin Taiyo Yuden LMK212BJ106KD T 104F 410 X5R 10V 0805 TDK C1608X5R0J106 110 X5R 6 3V 0603 c MURATA GRM219R61C475KE15 A7UE 410 X5R 16V 0805 MID TDK C2012X5R1C475 S R 10 X5R 16V 0805 c MURATA GRM219R61C475KE15 GE 10 XSR 16V 0805 SNI TDK C2012X5R1C475 ia 210 X5R 16V 0805 CoilCraft LPS4012 472ML 20 curr 1 7A resist 0 1750 4 0x4 0x1 2 L TDK VLS252012T 4R7MR81 4 7uH 20 curr 1 3A resist 0 3380 2 5 x 2 0 x 1 2 DASTEK PNL3008 4R7M 20 curr 0 9A resist 0 2800 3 1 x 3 1 x 0 8 R1 ko 0402 R2 ko 0402 1 Inductor used for the typical application conditions Inductance values ranging from 3 3 HH to 6 8 HH can be used together with the STOD1317B A minimum saturation
7. Hz lpk Switch current limitation 1 6 2 2 4 A Output voltage Vout V pg Feedback voltage Ta 25 C 1 08 1 2 1 32 AVpp Accuracy 40 C lt T lt 85 C 1 02 1 38 V Vour Output voltage range 6 10 13 AVLINE LOA Total line load static Ta 25 C Vinz2 6V to D variation V 4 8V lour 5mA to 170mA ni a0 my Vout Output voltage ripple Vin 3 7V Vour 10V 30 mV RIPPLE loyr lt 10mA Vovp Overvoltage protection Vpg lt 0 14 15 16 V ILKFB FB pin leakage current Vep 5V to 13V 1 HA Step up output voltage Vout Vout Vout SMID regulation 0 38 0 56 0 7 ki Logic inputs VIL EN low level input voltage 0 4 V ViH EN high level input voltage 1 2 V ka EN input leakage current Vey Viy 4 8V 1 HA Power switches P Channel ON resistance lsw p lt 100mA 550 900 Rpson mo N Channel ON resistance Isw nz100mA 250 400 liKkaix LX leakage current Vin VLx 4 8V Ven 0 1 HA ky Doc ID 022607 Rev 1 7 22 Electrical characteristics STOD1317B Table 6 Electrical characteristics continued Symbol Parameter Test conditions Min Typ Max Unit DLP function Vin 3 7V VEN 0 lo LEax Leakage current from load Voyr lt 6V supplied by 0 5 2 HA external power 1 Not tested in production This value is guaranteed by correlation with Rpgon peak current limit and operating input voltage 2 Not tested in production 8 22 Doc ID 022607 Rev 1 s STOD1317B Typical performance characteristics 5 Typical performance charac
8. ames are the property of their respective owners 2011 STMicroelectronics All rights reserved STMicroelectronics group of companies Australia Belgium Brazil Canada China Czech Republic Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Philippines Singapore Spain Sweden Switzerland United Kingdom United States of America www st com 22 22 Doc ID 022607 Rev 1 ky
9. ates when the EN pin is set high If the EN pin is set low the device stops switching all the internal blocks are turned off In this condition the current drawn from Vjn is below 1 pA in the whole temperature range In addition the internal switches are in OFF state so the load is electrically disconnected from the input this avoids unwanted current leakage from the input to the load Soft start and inrush current limiting After the EN pin is pulled high or after a suitable voltage is applied to Vin and EN the device initiates the startup phase As a first step the Cyjp capacitor is charged the P1 switch implements a current limiting technique in order to keep the charge current below 400 mA This avoids battery overloading during startup After Vip reaches the Vin voltage level the P1 switch is fully turned on and the soft start procedure for the step up is started Vour starts to softly increase until it reaches the regulation value Undervoltage lockout The undervoltage lockout function avoids improper operation of the STOD1317B when the input voltage is not high enough When the input voltage is below the UVLO threshold the device is in shutdown mode The hysteresis of 100 mV avoids unstable operation when the input voltage is close to the UVLO threshold Overtemperature protection An internal temperature sensor continuously monitors the IC junction temperature If the IC temperature exceeds 150 C typical the device stop
10. current of 1 2 A must be ensured to support 170 mA at 2 6 V in full range Note All the above components refer to a typical application Operation of the device is not limited to the choice of these external components ky Doc ID 022607 Rev 1 3 22 Schematic STOD1317B Figure 2 Block schematic LX VMID MI LI s s SCP M1 rd M2 s PGND W 7 i H a ji VOUT GND i Mo 5 I RING KILLER PWM LOGIC CONTROL amp DRIVER SHUT DOWN NC Doc ID 022607 Rev 1 s 4 22 STOD1317B Pin configuration 2 sa Pin configuration Figure 3 Pin configuration top view VMID LX VOUT LX VO SET PGND GND PGND FB VIN EN NC Table 3 Pin description Pin name Pin number Description VMID 1 Step up output voltage VOUT 2 LDO output voltage VO SET 3 LDO output voltage set GND 4 Analog ground FB 5 Feedback voltage Enable pin Connect this pin to GND or a voltage lower than 0 4V EN 6 to shut down the IC A voltage higher than 1 2V is reguired to enable the IC NC 7 Not connected VIN 8 Supply voltage PGND 9 10 Power ground LX 11 12 Switch pin Inductor connection to the internal switches Exposed PAD Internally connected to PGND Doc ID 022607 Rev 1 5 22 Maximum ratings STOD1317B 3 Maximum ratings Table 4 Absolute maximum
11. loads and higher than 80 at full load The device includes soft start control inrush current limiter thermal shutdown and inductor peak current limit The STOD1317B is packaged in DFN12L 3 x 3 x 0 8 mm height STOD1317BPUR 1317B DFN12L 3 x 3mm 3000 parts per reel December 2011 Doc ID 022607 Rev 1 1 22 www st com Contents STOD1317B Contents 1 I LL ammmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmman 3 2 Pinconfiguration eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee 5 3 Maximum ratings eeeeeeeeeeeeeeeeeeeeeeeeeeee ei kalo 6 4 Electrical characteristics 7 5 Typical performance characteristics 9 6 Detailed description 11 6 1 BOOST multiple mode of operation 11 6 1 1 Pulse skipping operation 11 6 1 2 Discontinuous conduction mode 11 6 1 3 Continuous conduction mode 11 6 2 Enable pi resno sa AIGE ae kepe ah i kore k ENE MN deal geis ae akte i 12 6 3 Soft start and inrush current limiting 12 6 4 Undervoltage lockout ee eeeee ee ee Penko kil ka scenes 12 6 5 Overtemperature protection 12 6 6 Digital low power function 13 7 Application information
12. oc ID 022607 Rev 1 s STOD1317B Detailed description 6 6 1 Detailed description The STOD1317B is a high efficiency DC DC converter which integrates a step up and LDO power stage suitable for supplying AMOLED panels Thanks to the high level of integration it needs only 6 external components to operate and it achieves very high efficiency using a synchronous rectification technigue The controller uses an average current mode technigue in order to obtain good stability and precise voltage regulation in all possible conditions of input voltage output voltage and output current In addition the peak inductor current is monitored in order to avoid saturation of the coils The STOD1317B implements a power saving technigue in order to maintain high efficiency at very light load and it switches to PWM operation as the load increases in order to guarantee the best dynamic performances and low noise operation In order to guarantee very low ripple on the output voltage the step up output is filtered by the LDO There are two control loops the LDO control loop regulates Vour in order to provide the right voltage to the output while the boost control loop is internally set to provide and output voltage 380 mV higher than Vour in order to maintain the LDO in regulation at the minimum possible drop The STOD1317B avoids battery leakage thanks to the true shutdown feature and it is self protected from overtemperature and short circuit on
13. ratings Symbol Parameter Value Unit LX Switching node 0 3 to 16 Vour SET LDO output voltage set 16 V Vour Output voltage 0 3 to 16 V EN Logic pin 0 3 to 4 6 V FB Feedback pin 0 3 to 2 5 V tag Machine model 200 V Human body model 2000 V TAMB Operating ambient temperature 40 to 85 C Tj Maximum operating junction temperature 150 C TsTG Storage temperature 65 to 150 C Note Absolute maximum ratings are those values beyond which damage to the device may occur Functional operation under these conditions is not implied Table 5 Thermal data Symbol Parameter Value Unit Thermal resistance junction ambient Rihuc Thermal resistance junction case FR 4 PCB 4 216 C W s 6 22 Doc ID 022607 Rev 1 STOD1317B Electrical characteristics 4 Electrical characteristics Ty 25 C Vin 3 7 V Vout 10 V Cin 2x10 UF Cmip 2x4 7 HF Cour 2x4 7 HF L 4 7 UH Vpn z 2 V unless otherwise specified Table 6 Electrical characteristics Symbol Parameter Test conditions Min Typ Max Unit General section VIN Operating power input 26 37 48 V voltage range Shutdown mode ig Shutdown mode Ven GND 0 5 1 HA No switching Ven Vin 3 7V Veg 1 3V 1 1 5 mA V Undervoltage lockout Vin rising 2 4 2 5 V UVLO threshold Vin falling 2 1 2 2 fsw Switching freguency 1 1 2 1 35 M
14. s operating As soon as the temperature falls below 135 C typical normal operation is restored Doc ID 022607 Rev 1 ST Detailed description STOD1317B 6 6 Digital low power function The digital low power DLP function allows physical disconnection of the load from the device Figure 11 Digital low power function D IC VPNL Charge Pump DDVDH 6V SW lt Enable sip GPIO2 y GPIO1 Disable DCDC Disable EN EN T FB kk sw Enable Disable Refer to next page Disable LL Operation 1 When the power IC is disabled in order to disconnect leakage current through the feedback node the S W function is active 2 Anew EN transition from low to high and or device power up turn off the DLP function and allow IC to work under typical conditions ky Doc ID 022607 Rev 1 13 22 Application information STOD1317B 7 7 1 7 2 14 22 Application information External passive components Inductor selection The inductor is the key passive component for switching converters For the step up converter an inductance between 3 3 HH and 6 8 uH is recommended It is very important to select the right inductor according to the maximum current the inductor can handle in order to avoid saturation The peak current for the step up can be calculated as Eguation 1 Vip xlouT VINMin x Vip VINMIN z PEO nx
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16. sible to place the inductors and the Power GND routing Next we can trace the GND connected through vias to the PGND near to one of the main filter capacitors The LDO needs a quiet ground signal in order to operate properly It is important to pay close attention to the routing of traces from capacitor terminals in a DC DC converter circuit Large valued low ESR capacitors are expensive and bad routings can cancel their performance A good routing on the other hand can lower the output noise Ripple is directly related to the inductor value the capacitor ESR the switching frequency and so forth but HF noise spikes depends on parasitic elements and the switching action In a bad routing parasitic inductance associated with trace lengths causes problems In Figure 12 L1 brings about an increase in noise and L2 limits the attenuation of an added HF capacitor The solution is to bring the input trace in on one side of the capacitor pad and the output trace out on the other side of the pad Doc ID 022607 Rev 1 15 22 Application information STOD1317B 16 22 Figure 13 Top layer Doc ID 022607 Rev 1 STOD1317B Package mechanical data 8 Package mechanical data In order to meet environmental reguirements ST offers these devices in different grades of ECOPACK packages depending on their level of environmental compliance ECOPACK specifications grade definitions and product status are a
17. teristics Tj z 25 C VIN z 3 7 V Vout 10 V Cin 2x10 HF Cwip 2 X 4 7 HF Cour z 2 x4 7 HF L 4 7 UH Ven 2 V unless otherwise specified Figure 4 Guiescent current vs temperature Figure 5 Switching frequency vs temperature 2 75 Quiescent Current mA R n amp Switching Frequency KHz R B b e 2 25 0 25 50 75 100 125 1 25 7 7 25 0 25 50 75 100 125 Temperature C Temperature C Figure 6 Efficiency vs output current Figure 7 Switching freguency sw 80 275 VMID 8 701 VIN 4 2V VIN 3 7V E c5 VIN 3 2V VIN 2 9V 60 VOUT 55 i i i r 0 20 40 60 80 100 120 140 160 180 Output Current mA Frequency 1 285 MHz Vin 3 7 V lour 170 mA Ty 25 C Figure 8 Soft start inrush current Figure 9 Feedback voltage vs temperature 1 22 1 21 2 a 1 19 gt 1 18 1 17 1 16 1 15 7 7 7 r r r r i r r 7 23 25 27 29 3 1 33 35 37 39 41 43 45 47 49 Input Voltage V Vin 3 7 V NO LOAD Ty 25 C SS 1 265 ms Inrush current 260 mA ky Doc ID 022607 Rev 1 9 22 Typical performance characteristics STOD1317B Figure 10 TDMA noise immunity VIN z 2 6 V to 3 1 V lout 20 mA 10 22 D
18. vailable at www st com ECOPACK is an ST trademark ky Doc ID 022607 Rev 1 17 22 Package mechanical data STOD1317B DFN12L 3 x 3 x 0 6 mm mechanical data 18 22 mm inch Dim A A1 A3 b D D2 E E2 e 0 45 0 018 L 0 30 0 40 0 50 0 012 0 016 0 020 BOTTOM VIEW i i f 7 i EXPOSED PAD PIN ID ru p pa ka ji perch ome om T T T T 12 FEE 9 8 bail i AAO ii 4 i i Y SEATING PLANE mA T mere COPLANARITY IS 49 i af RN NR l _ TE Baan 7 E 2 b 5 PIN 1 b 7 a g 4 amp TTT rop vew 8085116 A Doc ID 022607 Rev 1 a STOD1317B Package mechanical data Tape amp reel OFNxx DFNxx 3x3 mechanical data mm inch DIM MIN TYP MAX MIN TYP MAX A 330 12 992 C 12 8 13 2 0 504 0 519 D N T Ao Bo Ko Po P V PKO N C V Y A i UU AT Bo O I O 6 b 0 4 O O m Ko AO aP Note Drawing not in scale ky Doc ID 022607 Rev 1 19 22 Package mechanical data STOD1317B Figure 15 DFN12L 3 x 3 mm footprint recommended data DIMENSIONS IN MILLIMETRES
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ST STOD1317B handbook