Home

LINEAR TECHNOLOGY LT1930/LT1930A handbook

1. FEATURES 1 2MHz Switching Frequency LT1930 2 2MHz Switching Frequency LT1930A Low Vcesat Switch 400mV at 1A High Output Voltage Up to 34V 5V at 480mA from 3 3V Input LT1930 12V at 250mA from 5V Input LT1930A Wide Input Range 2 6V to 16V Uses Small Surface Mount Components Low Shutdown Current lt 1pA Low Profile 1mm ThinSOT Package Pin for Pin Compatible with the LT1613 APPLICATIONS TFT LCD Bias Supply Digital Cameras Cordless Phones Battery Backup Medical Diagnostic Equipment Local 5V or 12V Supply External Modems PC Cards XDSL Power Supply LTC and LT are registered trademarks of Linear Technology Corporation ThinSOT is a trademark of Linear Technology Corporation D LTI930 LTI930A TECHNOLOGY 1 2MHz 2 2MHz Step Up DC DC Converters DESCRIPTION Erden The LT 1930 and LT1930A are the industry s highest power SOT 23 switching regulators Both include an internal 1A 36V switchallowing high current outputs to be generated in a small footprint The LT1930 switches at 1 2MHz allowing the use of tiny low cost and low height capacitors and inductors The faster LT1930A switches at 2 2MHz enabling further reductions in inductor size Complete regulator solutions approaching one tenth of a square inch in area are achievable with these devices Multiple output power supplies can now use a separate regulator for each output voltage replacing cumbersome quasi regulated app
2. ON SEMICONDUCTOR MBR0520 www onsemi com L1 SUMIDA CR43 5R6 www sumida com 1930 A TA07a 0 100 200 300 400 500 LOAD CURRENT mA 1930 A TA07b 5V to 12V 250mA Step Up Converter Efficiency L1 Di 30 Vin 5V V 2 2uH Vout 85 L Vour 12V 12V 250mA 80 g 75 C2 amp 2 2uF g 70 GND 85 60 C1 TAIYO YUDEN X5R LMK212BJ225MG LR 55 C2 TAIYO YUDEN X5R EMK316BJ225ML D1 ON SEMICONDUCTOR MBR0520 50 L1 MURATA LQH3C2R2M24 0 50 100 150 200 250 300 LOAD CURRENT mA 1930 A TAO8b LT1930 LT1930A TYPICAL APPLICATIONS 9V 18V 9V Triple Output TFT LCD Bias Supply with Soft Start 1 Di 24 a T 10mA C4 1uF VIN 9V 3 3V 200mA C1 2 2uF c5 Vss 10uF 3 3V m vw C1 X5R OR X7R 6 3V C2 C3 C5 X5R OR X7R 10V C4 XbR OR X7R 25V D1 D4 BAT54S OR EQUIVALENT D5 MBR0520 OR EQUIVALENT L1 PANASONIC ELTSKT4R7M 9V 8V 23V 8V Triple Output TFT LCD Bias Supply with Soft Start i 1 D4 aes Eee Peer C4 C5 C6 C1 X5R OR X7R 6 3V C2 04 C7 C8 5 OR X7R 10V C5 X5R OR X7R 16V C6 X5R OR X7R 25V D1 D6 BAT54S OR EQUIVALENT D7 MBR0520 OR EQUIVALENT 8V L1 PANASONIC ELTSKT4R7M 10mA 10 1930 4 TAt1a Start Up Waveforms 9V OUTPUT 5V DIV 9V OUTPUT 5V DIV 18V OUTPUT 10V DIV li1 0 5A DIV 2ms DIV Start Up Waveforms 2ms DIV 10 LT1930 LT1930A P
3. LT1617 Micropower Inverting DC DC Converter in 5 Lead ThinSOT 15V at 12mA from 2 5V Input ThinSOT Package LT1931 LT1931A Inverting 1 2MHz 2 2MHz Switching Regulator in 5 Lead ThinSOT 5V at 350mA from 5V input ThinSOT Package Burst Mode is a trademark of Linear Technology Corporation 1 Linear Technology Corporation 1630 McCarthy Blvd Milpitas CA 95035 7417 408 432 1900 FAX 408 434 0507 www linear com 1930af LT TP 0801 2K PRINTED IN USA TECHNOLOGY LINEAR TECHNOLOGY CORPORATION 2001
4. Manufacturers Taiyo Yuden 408 573 4150 www t yuden com AVX 803 448 9411 WWW avxcorp com Murata www murata com 714 852 2001 Thedecision to use either low ESR ceramic capacitors or the higher ESR tantalum or OSCON capacitors can affect the stability of the overall system The ESR of any capaci tor along with the capacitance itself contributes a zero to the system For the tantalum and OSCON capacitors this zero is located ata lower frequency due to the higher value of the ESR while the zero of a ceramic capacitor is at a much higher frequency and can generally be ignored A phase lead zero can be intentionally introduced by placing a capacitor C3 in parallel with the resistor R1 between Vgyrand Veg as shown in Figure 1 The frequency of the zero is determined by the following equation 1 By choosing the appropriate values for the resistor and capacitor the zero frequency can be designed to improve the phase margin of the overall converter The typical target value for the zero frequency is between 35kHz to 55kHz Figure 3 shows the transient response of the step up converter from Figure 1 without the phase lead capaci tor C3 The phase margin is reduced as evidenced by more ringing in both the output voltage and inductor current A 10pF capacitor for C3 results in better phase margin which is revealed in Figure 4 as a more damped response and less overshoot Figure 5 shows the
5. VOLTAGE To set the output voltage select the values of R1 and R2 see Figure 1 according to the following equation R1 Ro OUT 4 1 255V A good value for R2 is 13 3k which sets the current in the resistor divider chain to 1 255V 13 3k 94 7uA VIN 16V LT1930 SHDN LAYOUT HINTS The high speed operation of the LT1930 LT1930A demands careful attention to board layout You will not get advertised performance with careless layout Figure 6 shows the recommended component placement L1 He at AU C1 j Viu SHUTDOWN 1930 F06 Figure 6 Suggested Layout Driving SHDN Above 10V The maximum voltage allowed on the SHDN pin is 10V If you wish to use a higher voltage you must place a resistor in series with SHDN A good value is 121k Figure 7 shows a circuit where Viy 16V and SHDN is obtained from Viy The voltage on the SHDN pin is kept below 10V 1930 FO7 Figure 7 Keeping SHDN Below 10V LT1930 LT1930A TYPICAL APPLICATIONS Efficiency 4 Cell to 5V SEPIC Converter a C3 Vin 6 5V L1 iu 5 75 4V TO 6 5V 10uH Vout Vin 4V 5V 70 EFFICIENCY 4 CELL BATTERY SHDN SEN C2 SHDN 10uF 55 GND 50 45 C1 TAIYO YUDEN X5R LMK212BJ225MG sons i C2 TAIYO YUDEN X5R JMK316BJ106ML 01 ON SEMICONDUCTOR MBR0520 5 ao 2a S o END C3 TAIYO YUDEN X5R LMK212BJ105MG L1 L2 MURATA LQH3C100K24 LOAD
6. and is simply an amplified version of the difference between the feedback voltage and the reference voltage of 1 255V In this manner the error amplifier sets the correct peak current level to keep the output in regulation If the error amplifier s output increases more current is delivered to the output if it decreases less current is delivered The LT1930 has a current limit circuit not shown in Figure 2 The switch current is constantly monitored and not al lowed to exceed the maximum switch current typically 1 2A Ifthe switch current reaches this value the SR latch is reset regardless of the state of comparator A2 This current limit helps protect the power switch as well as the external components connected to the LT1930 The block diagram for the LT1930A not shown is iden tical except that the oscillator frequency is 2 2MHz LT1930 LT1930A APPLICATIONS INFORMATION LT1930 AND LT1930A DIFFERENCES Switching Frequency The key difference between the LT1930 and LT1930A is the faster switching frequency of the LT1930A At 2 2MHz the LT1930A switches at nearly twice the rate of the LT1930 Care must be taken in deciding which part to use The high switching frequency of the LT1930A allows smaller cheaper inductors and capacitors to be used in a given application but with a slight decrease in efficiency and maximum output current when compared to the LT1930 Generally if efficiency and maximum output current are crit
7. transient response when a 33uF tantalum capacitor with no phase lead capacitor is used on the output The higher output voltage ripple is revealed in the upper waveform as a set of double lines The transient response is not greatly improved which implies that the ESR zero frequency is too high to increase the phase margin Vout 0 2V DIV AC COUPLED lu 0 5A DIV AC COUPLED LOAD 250mA CURRENT 150mA 50us DIV 1930 F03 Figure 3 Transient Response of Figure 1 s Step Up Converter without Phase Lead Capacitor Vout 0 2V DIV AC COUPLED lu 0 5A DIV AC COUPLED LOAD 250mA CURRENT 155A 50us DIV 1930 F04 Figure 4 Transient Response of Figure 1 s Step Up Converter with 10pF Phase Lead Capacitor 6 LT1930 LT1930A APPLICATIONS INFORMATION 0 2V DIV AC COUPLED LOAD 250mA ME CURRENT 150mA 200us DIV 1930 F04 Figure 5 Transient Response of Step Up Converter with 33uF Tantalum Output Capacitor and No Phase Lead Capacitor DIODE SELECTION ASchottky diode is recommended for use with the LT1930 LT1930A The Motorola MBR0520 is a very good choice Where the switch voltage exceeds 20V use the MBR0530 a 30V diode Where the switch voltage exceeds 30V use the MBR0540 a 40V diode These diodes are rated to handle an average forward current of 0 5A In applications where the average forward current of the diode exceeds 0 5A a Microsemi UPS5817 rated at 1A is recommended SETTING OUTPUT
8. 0 C Lead Temperature Soldering 10 sec 300 C PACKAGC ORDER INFORMATION ORDER PART NUMBER TOP VIEW SW 1 5 Vin LT1930ES5 GND 2 LT1930AES5 FB3 4 SHON 5 PACKAGE 5 PART MARKING 5 LEAD PLASTIC SOT 23 Tymax 125 C Oya 256 C W LTKS LTSQ Consult LTC Marketing for parts specified with wider operating temperature ranges ELECTRICAL CHARACTERISTICS The e denotes specifications which apply over the full operating temperature range otherwise specifications are T 25 C Vin Vin unless otherwise noted Note 2 LT1930 LT1930A PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Minimum Operating Voltage 2 45 2 6 2 45 2 6 V Maximum Operating Voltage 16 16 V Feedback Voltage 1 240 1 255 1270 1 240 1 255 1 270 V 1 230 1 280 1 230 1 280 V FB Pin Bias Current Vrg 1 255V 120 360 240 720 nA Quiescent Current VsupN 2 4V Not Switching 4 2 6 5 5 8 mA Quiescent Current in Shutdown VspN OV Vin 3V 0 01 1 0 01 1 Reference Line Regulation 2 6V lt Viy lt 16V 0 01 0 05 0 01 0 05 9 N Switching Frequency 1 1 2 14 1 8 2 2 2 6 MHz 0 85 1 6 1 6 2 9 MHz Maximum Duty Cycle 84 90 75 90 Switch Current Limit Note 3 1 1 2 2 1 1 2 2 5 A Switch VcEsAT Isw 1A 400 600 400 600 mV Switch Leakage Current Vow 5V 0 01 1 0 01 1 pA SHDN Input Voltage High 24 24 V SHDN Input Voltage Low 0 5 0 5 V SHDN Pin B
9. 60 70 80 90 50 25 0 25 50 75 100 DUTY CYCLE 96 n SURE A TEMPERATURE C 1930 A G04 1930 A G05 1930 A G06 PIN FUNCTIONS SW Pin 1 Switch Pin Connect inductor diode here SHDN Pin 4 Shutdown Pin Tie to 2 4V or more to enable Minimize trace area at this pin to reduce EMI device Ground to shut down GND Pin 2 Ground Tie directly to local ground plane Viy Pin 5 Input Supply Pin Must be locally bypassed FB Pin 3 Feedback Pin Reference voltage is 1 255V Connect resistive divider tap here Minimize trace area at FB Set Voyr according to Vor 1 255V 1 R1 R2 LT1930 LT1930A BLOCK DIAGRAM 1 255V REFERENCE R1 EXTERNAL FB R2 EXTERNAL Vout SHUTDOWN SHDN COMPARATOR 1930 A BD 2 2MHz FOR LT1930A Figure 2 Block Diagram OPERATION The LT1930 uses a constant frequency current mode control scheme to provide excellent line and load regula tion Operation can be best understood by referring to the block diagram in Figure 2 At the start of each oscillator cycle the SR latch is set which turns on the power switch Q1 A voltage proportional to the switch current is added to a stabilizing ramp and the resulting sum is fed into the positive terminal of the PWM comparator A2 When this voltage exceeds the level at the negative input of A2 the SR latch is reset turning off the power switch The level at the negative input of A2 is set by the error amplifier A1
10. ACKAGE DESCRIPTION 5 Package 5 Lead Plastic SOT 23 Reference LTC DWG 05 08 1633 Reference LTC DWG 05 08 1635 2 80 3 10 lt 110 118 e NOTE 3 P 807 23 507 23 Original ThinSOT 90 145 1 00 MAX d 035 057 039 MAX 20 15 01 10 2 60 3 00 150 175 00 006 0004 004 102 118 059 069 a2 20 130 80 90 NOTE 3 035 051 031 035 35 55 30 50 REF L 014021 012 019 REF c Erg PIN ONE gt Y 95 25 50 037 gt 010 020 REF BPLCS NOTE 2 20 y 008 A A A2 DATUM A Y 1 90 _ 09 20_ 074 M NOTE 004 008 REF 55 507 23 0401 1 CONTROLLING DIMENSION MILLIMETERS NOTE 2 MILLIMETERS INCHES 3 DRAWING NOT TO SCALE 4 DIMENSIONS ARE INCLUSIVE OF PLATING 5 DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 6 MOLD FLASH SHALL NOT EXCEED 254mm 7 PACKAGE EIAJ REFERENCE IS SC 74A EIAJ FOR ORIGINAL JEDEL 193 FOR THIN 2 DIMENSIONS ARE IN Information furnished by Linear Technology Corporation is believed to be accurate and reliable However no responsibility is assumed for its use Linear Technology Corporation makes no represen tation that the interconnec
11. CURRENT mA 1930 TA02b 4 Cell to 5V SEPIC Converter with Coupled Inductors 5V to 24V Boost Converter L1A Bi L1 4V TO 6 5V 10g Vour Vour 5V 24V 300mA 90mA 4 CELL C2 BATTERY C2 2 2uF 10uF C1 TAIYO YUDEN X5R LMK212BJ225MG EE ik C1 TAIYO YUDEN X5R EMK316BJ475ML C2 TAIYO YUDEN X5R JMK316BJ106ML C2 TAIYO YUDEN X5R JMK212BJ475MG 7 C3 TAIYO YUDEN X5R LMK212BJ105MG D1 ON SEMICONDUCTOR MBR0530 D1 ON SEMICONDUCTOR MBR0520 L1 SUMIDA CR43 100 L1 SUMIDA CLS62 100 15V Dual Output Converter with Output Disconnect C4 L1 01 3 3uH Vin 15V 5V 70mA LT1930 d SHDN 2 2uF GND C1 TAIYO YUDEN X5R LMK212BJ225MG C2 C3 TAIYO YUDEN X5R EMK316BJ225ML 5 C4 C5 TAIYO YUDEN X5R TMK316BJ105ML 408 573 4150 D1 TO D4 ON SEMICONDUCTOR 520 800 282 9855 L1 SUMIDA CR43 3R3 874 956 0666 19391405 mA LT1930 LT1930A TYPICAL APPLICATIONS Boost Converter with Reverse Battery Protection L1 4 7uH 01 Vin n Vout 3Vto6V 8V 520mA AT Viy 6V 240mA AT 3V LT1930 EE C2 SHDN 22uF GND C1 TAIYO YUDEN X5R LMK432BJ226MM E uds C2 TAIYO YUDEN X5R LMK212BJ225MG 01 ON SEMICONDUCTOR MBR0520 L1 SUMIDA CR43 4R7 1 SILICONIX 51643300 3 3V to 5V Boost Converter Efficiency L1 5 6uH n Vour Vin 5V 3 3V LT1930 T SHDN GND 5 EFFICIENCY C1 TAIYO YUDEN X5R JMK212BJ475MG www t yuden com C2 TAIYO YUDEN X5R JMK316BJ106ML D1
12. ciency use similar valued inductors with a larger volume For example the Sumida CR43 series in values ranging from 2 2uH to 4 7 will give an LT1930A application a few percentage points increase in efficiency compared to the LI WIR smaller Murata LQH3C Series LT1930 LT1930A APPLICATIONS INFORMATION CAPACITOR SELECTION Low ESR equivalent series resistance capacitors should be used atthe output to minimize the output ripple voltage Multi layer ceramic capacitors are an excellent choice as they have extremely low ESR and are available in very small packages X5R dielectrics are preferred followed by X7R as these materials retain the capacitance over wide voltage and temperature ranges A 4 7uF to 10uF output capacitor is sufficient for most applications but systems with very low output currents may need only a 1uFor 2 2uF output capacitor Solid tantalum or OSCON capacitors can be used but they will occupy more board area than a ceramic and will have a higher ESR Always use a capacitor with a sufficient voltage rating Ceramic capacitors also make a good choice for the input decoupling capacitor which should be placed as close as possible to the LT1930 LT1930A 1uF to 4 7uF input capacitor is sufficientfor most applications Table 3 shows list of several ceramic capacitor manufacturers Consult the manufacturers for detailed information on their entire selection of ceramic parts Table 3 Ceramic Capacitor
13. ctor has a low DCR copper wire resistance to minimize I R power losses A 4 7uH or 10uH inductor will be the best choice for most LT1930 designs For LT1930A designs a 2 2uH to 4 7 inductor will usually suffice Note that in some applica tions the current handling requirements of the inductor can be lower such as in the SEPIC topology where each inductor only carries one half of the total switch current Table 1 Recommended Inductors LT1930 MAX SIZE L DCR LxWxH PART mo mm VENDOR CDRH5D18 4R1 4 1 57 45 47 2 0 Sumida CDRH5D18 100 10 124 847 956 0666 CR43 4R7 4 7 109 32x2 5x2 0 www sumida com CR43 100 10 182 DS1608 472 47 60 45x6 6x2 9 Coilcraft DS1608 103 10 75 847 639 6400 www coilcraft com ELT5KT4R7M 47 240 5 2x5 2x1 1 Panasonic ELT5KT6R8M 6 8 360 408 945 5660 Www panasonic com Table 2 Recommended Inductors LT1930A MAX SIZE L DCR LxWxH PART uH mo mm VENDOR LQH3C2R2M24 2 2 126 32x2 5x2 0 Murata LQH3C4R7M24 47 195 404 573 4150 www murata com CR43 2R2 2 2 71 45x 4 0 x 3 0 Sumida CR43 3R3 3 3 86 847 956 0666 www sumida com 1008PS 272 24 100 3 7x3 7x2 6 Coilcraft 1008PS 332 3 3 110 800 322 2645 www coilcraft com ELT5KT3R3M 3 8 204 5 2x5 2x 1 1 Panasonic 408 945 5660 Www panasonic com The inductors shown in Table 2 for use with the LT1930A were chosen for small size For better effi
14. ias Current VSHDN 3V 16 32 35 70 VsHpNn OV 0 0 1 0 0 1 pA Vote 1 Absolute Maximum Ratings are those values beyond which the life of a device may be impaired Note 2 The LT1930E LT1930AE are guaranteed to meet performance specifications from 0 C to 70 C Specifications over the 40 to 85 C operating temperature range are assured by design characterization and correlation with statistical process controls Vote 3 Current limit guaranteed by design and or correlation to static test LT1930 LT1930A TYPICAL PERFORMANCE CHARACTERISTICS Quiescent Current FB Pin Voltage SHDN Pin Current 7 0 1 28 NOT SWITCHING 6 5 127 LT1930A 6 0 3 55 51 26 ce S 50 F 1 25 5 E Q z 45 amp o4 LT1930 5 40 5 1 23 3 5 3 0 1S 50 25 0 25 50 75 100 100 1 2 3 4 5 6 TEMPERATURE C SHDN PIN VOLTAGE V 1930 A G01 1930 A G02 1930 A G03 Current Limit Switch Saturation Voltage Oscillator Frequency CURRENT LI MIT A FREQUENCY MHz 1 6 0 45 25 14 0 40 2 3 21 LT1930A 12 0 30 13 17 0 25 15 amp 0 20 0 6 1 3 LT1930 0 15 i 0 10 08 0 2 0 05 07 _ 1 1 0 5 0 i 10 20 30 40 50
15. ical the L T1930 should be used If applica tion size and cost are more important the LT1930A will be the better choice In many applications tiny inexpensive chip inductors can be used with the LT1930A reducing solution cost Duty Cycle The maximum duty cycle DC of the LT1930A is 75 compared to 8496 for the LT1930 The duty cycle for a given application using the boost topology is given by DC Vout Mn Vout Fora dV to 12V application the DC is 58 3 indicating that the LT1930A could be used A 5V to 24V application has a DC of 79 2 making the LT1930 the right choice The LT1930A can still be used in applications where the DC as calculated above is above 75 However the part must be operated in the discontinuous conduction mode so that the actual duty cycle is reduced INDUCTOR SELECTION Several inductors that work well with the LT1930 are listed in Table 1 and those for the LT1930A are listed in Table 2 These tables are not complete and there are many other manufacturers and devices that can be used Consult each manufacturer for more detailed information and for their entire selection of related parts as many different sizes and shapes are available Ferrite core inductors should be used to obtain the best efficiency as core losses at 1 2MHz are much lower for ferrite cores than for cheaper powdered iron types Choose an inductor that can handle at least 1A without saturating and ensure that the indu
16. roaches using a single regulator and custom transformers Aconstantfrequency internally compensated current mode PWM architecture results in low predictable output noise that is easy to filter Low ESR ceramic capacitors can be used at the output further reducing noise to the millivolt level The high voltage switch on the LT1930 LT1930A is rated at 36V making the device ideal for boost converters up to 34V as well as for single ended primary inductance converter SEPIC and flyback designs The LT1930 can generate 5V at up to 480mA from a 3 3V supply or 5V at 300mA from four alkaline cells in a SEPIC design The LT1930 LT1930A are available in the 5 lead ThinSOT package TYPICAL APPLICATION C1 TAIYO YUDEN X5R LMK212BJ225MG C2 TAIYO YUDEN X5R EMK316BJ475ML D1 ON SEMICONDUCTOR MBRO0520 L1 SUMIDA CR43 100 OPTIONAL Figure 1 5V to 12V 300mA Step Up DC DC Converter Efficiency Viy 5V EFFICIENCY gt 0 100 200 300 400 LOAD CURRENT mA 1930 TA01 LT1930 LT1930A ABSOLUTE MAXIMUM RATINGS Note 1 Viy VONAGO ee ee ee een ee EE 16V SW Voltage RR E 0 4V to 36V FE VONAGE NND 2 5V Current Into FB 1mA SHDN Voltage acte ttes 10V Maximum Junction Temperature 125 C Operating Temperature Range Note 2 40 C to 85 C Storage Temperature Range 65 C to 15
17. tion of its circuits as described herein will not infringe on existing patent rights 11 LTI930 LTI930A TYPICAL APPLICATION Vout 50mV DIV AC COUPLED lu 0 5A DIV AC COUPLED LOAD 300mA CURRENT pora 3 3V to 5V 450mA Step Up Converter L1 2 2uH D1 VIN 3 3V C1 TAIYO YUDEN X5R LMK212BJ225MG C2 TAIYO YUDEN X5R JMK316B106ML D1 ON SEMICONDUCTOR MBRO0520 L1 MURATA LQH3C2R2M24 3 3V to 5V Transient Response EFFICIENCY 96 20us DIV 1930 F03 CT 1980 4 09 Efficiency Vin 3 3V Vout 5V 100 200 300 400 500 LOAD CURRENT mA RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1307 Single Cell Micropower 600kHz PWM DC DC Converter 3 3V at 75mA from Single Cell MSOP Package LT1316 Burst Mode Operation DC DC Converter with Programmable Current Limit 1 5V Minimum Precise Control of Peak Current Limit LT1317 2 Cell Micropower DC DC Converter with Low Battery Detector 3 3V at 200mA from 2 Cells 600kHz Fixed Frequency LT1610 Single Cell Micropower DC DC Converter 3V at 30mA from 1V 1 7MHz Fixed Frequency LT1611 Inverting 1 4MHz Switching Regulator in 5 Lead ThinSOT 5V at 150mA from 5V Input ThinSOT Package LT1613 1 4MHz Switching Regulator in 5 Lead ThinSOT 5V at 200mA from 3 3V Input ThinSOT Package LT1615 Micropower Constant Off Time DC DC Converter in 5 Lead ThinSOT 20V at 12mA from 2 5V ThinSOT Package

LINEAR TECHNOLOGY LT1930/LT1930A handbook

Contents

Download Pdf Manuals

Related Search

Related Contents