LT1431

LT1431_15 LINER | Alldatasheet

Document overview

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Technical content

The L T®1431 is an adjustable shunt voltage regulator with 100mA sink capability, 0.4% initial reference voltage tolerance and 0.3% typical temperature stability. On-chip divider resistors allow the L T1431 to be configured as a 5V shunt regulator , with 1% initial voltage tolerance and requiring no additional external components. By adding two external resistors, the output voltage may be set to any value between 2.5V and 36V . The nominal internal current limit of 100mA may be decreased by including one external resistor . A simplified 3-pin version, the L T1431CZ/L T1431IZ, is available for applications as an adjustable reference and is pin compatible with the TL431. Isolated 5V Regulator

applicaTions

n Guaranteed 0.4% Initial Voltage T olerance n 0.1Ω Typical Dynamic Output Impedance n Fast Turn-On n Sink Current Capability, 1mA to 100mA n Low Reference Pin Current n Available in J8, N8, S8 or 3-Lead TO-92 Z Packages n Linear Regulators n Adjustable Power Supplies n Switching Power Supplies VREF vs Temperature LT1431 TA01 COLLCOMPV+ LT1431 GND-FGND-S RTOP REF RMID 2.5V gm = 4mA/V SWITCHING REGULATOR VIN TEMPERATURE (°C) –50 VREF (V) 2.4975 2.5000 2.5025 25 75 LT1431 TA01b 2.4950 2.4925 –25 0 50 100 125 2.4900 2.4875 L, L T , L TC, L TM, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

.7V Ambient Temperature Range 5°C to 125°C 40°C to 85°C °C TO 70°C (Note 1) pin conFiguraTion orDer inForMaTion LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE L T1431CN8#PBF L T1431CN8#TRPBF L T1431 CN8 8-Lead Plastic DIP 0°C to 70°C L T1431IN8#PBF L T1431IN8#TRPBF L T1431 IN8 8-Lead Plastic DIP –40°C to 85°C L T1431CS8#PBF L T1431CS8#TRPBF L T1431 8-Lead Plastic SO 0°C to 70°C L T1431IS8#PBF L T1431IS8#TRPBF L T1431I 8-Lead Plastic SO –40°C to 85°C L T1431MPS8#PBF L T1431MPS8#TRPBF L T1431 8-Lead Plastic SO –55°C to 125°C L T1431MJ8#PBF L T1431MJ8#TRPBF L T1431 MJ8 8-Lead CERDIP –55°C to 125°C L T1431CZ#PBF L T1431CZ#TRPBF L T1431 CZ 3-Lead TO-92 Plastic 0°C to 70°C L T1431IZ#PBF L T1431IZ#TRPBF L T1431 IZ 3-Lead TO-92 Plastic –40°C to 85°C Consult L TC Marketing for parts specified with wider operating temperature ranges. Consult L TC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear .com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear .com/tapeandreel/ Junction Temperature Range 5°C to 150°C 40°C to 100°C °C to 100°C 65°C to 150°C 00°C TOP VIEW COLLECTOR COMP RTOP REF R MID GND-F GND-S J8 PACKAGE 8-LEAD CERDIP TJMAX = 150°C, θJA = 100°C/W TOP VIEW COLLECTOR COMP RTOP REF R MID GND-F GND-S N8 PACKAGE 8-LEAD PLASTIC DIP TJMAX = 100°C, θJA = 130°C/W TOP VIEW REF RMID GND-F GND-S COLLECTOR COMP V RTOP S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 100°C, θJA = 170°C/W BOTTOM VIEW REF ANODE CATHODE Z PACKAGE 3-LEAD TO-92 PLASTIC TJMAX = 100°C, θJA = 150°C/W

elecTrical characTerisTics

Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: V KA is the cathode voltage of the LT1431CZ/IZ and corresponds to V+ of the LT1431CN8/IN8/CS8/IS8. I K is the cathode current of the The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. IK = 10mA unless otherwise specified (Note 2) SYMBOL PARAMETER CONDITIONS L T1431I, L T1431M L T1431C UNITSMIN TYP MAX MIN TYP MAX VREF Reference Voltage VKA = 5V , IK = 2mA, (Note 3) l 2.490 2.465 2.500 2.510 2.535 2.490 2.480 2.500 2.510 2.520 V V REF/∆T Reference Drift VKA = 5V , IK = 2mA l 50 30 ppm/°C ∆VREF/∆VKA Voltage Ratio, Reference to Cathode (Open-Loop Gain) I K = 2mA, VKA = 3V to 36V l 0.2 0.5 0.2 0.5 mV/V |IREF| Reference Input Current VKA = 5V , TA = 25°C l 0.2 1.0 1.5 0.2 1.0 1.2 µA µA I MIN Minimum Operating Current V KA = VREF to 36V 0.6 1.0 0.6 1.0 mA |IOFF| Off-State Cathode Current V KA = 36V , VREF = 0V l µA µA LEAK| Off-State Collector Leakage Current V COLL = 36V , V+ = 5V , VREF = 2.4V l µA µA KA| Dynamic Impedance VKA = VREF, IK = 1mA to 100mA, f ≤ 1kHz 0.2 0.2 Ω ILIM Collector Current Limit VKA = VREF + 50mV l 80 360 100 260 mA LT1431CZ/IZ and corresponds to I(V +) + ICOLLECTOR of the LT1431CN8/ IN8/CS8/IS8. Note 3: The LT1431 has bias current cancellation which is effective only for VKA ≥ 3V. A slight (≈2mV) shift in reference voltage occurs when VKA drops below 3V. For this reason, these tests are not performed at VKA = VREF.

Typical perForMance characTerisTics VREF and IREF vs Temperature ILIMIT vs Temperature with External Resistor COLLECTOR VSAT vs Temperature vs Current Propagation Delay vs Overdrive Voltage Gain and Phase vs Frequency T ransconductance and Phase vs Frequency (REF to COLL) 2.5V Reference I K vs VKA VREF and IREF vs V+ VREF and IREF vs V+ VKA (V) IK (µA) 600 800 1000 4.0 LT1431 TPC01 400 200 1.0 2.0 3.0 5.0 IMIN 500 700 900 300 100 V+ (V) 2.5 VREF (V) 2.501 2.503 2.505 3.3 LT1431 TPC02 2.499 2.497 2.495 2.7 2.9 3.1 3.5 IREF (µA) 1.5 2.5 3.5 0.5 –0.5 –1.5 VREF IREF 2.500 2.502 2.504 2.498 2.496 1.0 2.0 3.0 –1.0 V+ (V) VREF (V) 2.501 2.503 2.505 LT1431 TPC03 2.499 2.497 2.495 8 16 24 40 IREF (µA) 1.5 2.5 3.5 0.5 –0.5 –1.5 VREF IREF 2.500 2.502 2.504 2.498 2.496 284 12 20 36 1.0 2.0 3.0 –1.0 TEMPERATURE (°C) –50 VREF (V) 2.4975 2.5000 2.5025 25 75 LT1431 TPC04 2.4950 2.4925 –25 0 50 100 125 2.4900 2.4875 0.33 0.66 1.00 –0.33 –0.66 –1.00 IREF (µA) VREF IREF TEMPERATURE (°C) –50 ILIMIT (NORMALIZED) 1.000 1.125 1.250 25 75 LT1431 TPC05 0.875 0.750 –25 0 50 100 125 0.625 0.500 ILIMIT = 0.7 RLIM + 3.6 AT 25°C TEMPERATURE (°C) –50 VSAT (V) 0.80 1.00 1.20 25 75 LT1431 TPC06 0.60 0.40 –25 0 50 100 125 0.20 ICOLL = 100mA ICOLL = 20mA ICOLL = 10mA ICOLL = 50mA OVERDRIVE (mV) PROPAGATION DELAY (µs) 120 150 200 LT1431 TPC07 50 100 150 250 105 135 3 1 OUTPUT 5 6 LT1431VREF ± OVERDRIVE OUTPUT HIGH-TO-LOW OUTPUT LOW-TO-HIGH FREQUENCY (Hz) REF-TO-COLL 1k LOAD AV (dB) 120 140 100 10k 100k 10M LT1431 TPC08 1k 1M 100 –20 –90 –45 135 180 –135 –180 PHASE (DEG) PHASE AV FREQUENCY (Hz) 1010 100 10k 100k 10M LT1431 TPC09 1k 1M –90 –45 135 180 –135 –180 PHASE (DEG) 109 108 107 106 105 104 103 102 REF-TO-COLL gm (µ )/uni03A9 PHASE gm

Typical perForMance characTerisTics ICOMP vs VCOMP vs VREF Noise vs Frequency 0.1Hz to 10Hz Noise T ransconductance and Phase vs Frequency (Ref to Comp) Dynamic Impedance vs Frequency V COMP vs Temperature vs ICOLL FREQUENCY (Hz) 104 100 10k 100k 10M LT1431 TPC10 1k 1M –100 –80 –40 –120 –20 –60 –140 PHASE (DEG) 3 × 103 103 0.1 REF-TO-COLL gm (µ )/uni03A9 PHASE gm 3 × 102 FREQUENCY (Hz) 100 0.8 1.0 1.2 1.4 1k 10k 100k LT1431 TPC11 0.6 0.4 0.2 IK ≤ 100mA ZKA (/uni03A9) TEMPERATURE (°C) –50 VCOMP (V) 2.0 2.5 3.0 25 75 LT1431 TPC12 1.5 1.0 –25 0 50 100 125 0.5 ICOLL = 100mA ICOLL = 10mA VCOMP (V) ICOMP (µA) 400 500 600 1.5 2.5 LT1431 TPC13 300 200 100 VREF = 5V VREF = 4V VREF = 3V VREF = 2.53V FREQUENCY (Hz) NOISE (nV/√Hz) 1000 1 100 1k 100k LT1431 G14 10 10k 500 TIME (MINUTES) 0 3 5 LT1431 TPC15 1 2 4 6 NOISE VOLTAGE (50µV/DIV)

COLL (Pin 1): Open collector of the output transistor . The maximum pin voltage is 36V . The saturation voltage at 100mA is approximately 1V . COMP (Pin 2): Base of the driver for the output transis- tor . This pin allows additional compensation for complex feedback systems and shutdown of the regulator . It must be left open if unused. V + (Pin 3): Bias voltage for the entire shunt regulator . The maximum input voltage is 36V and the minimum to operate is equal to VREF (2.5V). The quiescent current is typically 0.6mA. RTOP (Pin 4): Top of the on-chip 5k-5k resistive divider that guarantees 1% accuracy of operation as a 5V shunt regulator with no external trim. The pin is tied to COLL for self-contained 5V operation. It may be left open if unused. See note on parasitic diodes below. GND-S (Pin 5): Ground reference for the on-chip resis- tive divider and shunt regulator circuitry except for the output transistor . This pin allows external current limit of the output transistor with one resistor between GND-F (force) and GND-S (sense). GND-F (Pin 6): Emitter of the output transistor and sub- strate connection for the die. R MID (Pin 7): Middle of the on-chip resistive divider string between RTOP and GND-S. The pin is tied to REF for self- contained 5V operation. It may be left open if unused. REF (Pin 8): Control pin of the shunt regulator with a 2.5V threshold. If V+ > 3V , input bias current cancellation reduces IB to 0.2µA typical. COMP , RTOP, RMID, and REF have static discharge protection circuits that must not be activated on a continuous basis. Therefore, the absolute maximum DC voltage on these pins is 6V , well beyond the normal operating conditions. As with all bipolar ICs, the L T1431 contains parasitic diodes which must not be forward biased or else anomalous behavior will result. Pin conditions to be avoided are R TOP below RMID in voltage and any pin below GND-F in voltage (except for GND-S). The following pin definitions apply to the Z package. CATHODE: Corresponds to COLL and V + tied together . ANODE: Corresponds to GND-S and GND-F tied together . REF: Corresponds to REF . L T1431 BD COMPV+ GND-FORCEGND-SENSE RTOP REF RMID 2.5V gm = 4mA/V COLLECTOR 4 3 2 1

As a shunt regulator , the L T1431 is stable for all capacitive loads on the COLL pin. Capacitive loading between 0.01µF and 18µF causes reduced phase margin with some ringing under transient conditions. Output capacitors should not be used arbitrarily because output noise is not necessar- ily reduced. Excess capacitance on the REF pin can introduce enough phase shift to induce oscillation when configured as a reference >2.5V . This can be compensated with capacitance between COLL and REF (phase lead). More complicated feedback loops may require shaping of the frequency response of the L T1431 with dominant pole or pole-zero compensation. This can be accomplished with a capacitor or series resistor and capacitor between COLL and COMP . The compensation schemes mentioned above use voltage feedback to stabilize the circuits. There must be voltage gain at the COLL pin for them to be effective, so the COLL pin must see a reasonable AC impedance. Capacitive loading of the COLL pin reduces the AC impedance, voltage gain, and frequency response, thereby decreasing the effective- ness of the compensation schemes, but also decreasing their necessity. 2.5V Reference 3-Pin Package 2.5V Reference 8-Pin Package 5V Reference Increasing 5V Reference Programmable Reference with Adjustable Current Limit VIN RL 2.5V LT1431 TA02 CATHODE REF LT1431Z ANODE VIN RL 2.5V LT1431 TA03 COLL REF LT1431 GND-F GND-S VIN RL LT1431 TA04 COLL REF LT1431 GND-F GND-S RTOP RMID VIN RL 5V + ∆ LT1431 TA05 R ∆ = R • (0.5mA) ±25% PROCESS TOLERANCE ∆ ≤ 500mV COLL REF LT1431 GND-F GND-S RTOP RMID VIN RL LT1431 TA06 RLIM VOUT = ( )1 + R1 R2 VREF ILIMIT = 0.7 RLIM + 3.6 AT 25°C COLL REF LT1431 GND-F GND-S

PNP Low Dropout 5V Regulator* FET Low Dropout 5V Regulator with Current Limit 0.015µF 150/uni03A9 LT1431 TA07 COLL REF LT1431 GND-F COMP GND-S RMIDRTOP 2 1 5 6 20/uni03A9** 47/uni03A9 330µF 0.1µF VIN MEASURED DROPOUT VOLTAGE 420mV AT 4A 190mV AT 2A 95mV AT 1A 60mV AT 0.5A *NO SHORT-CIRCUIT PROTECTION **MAY BE INCREASED AT LOWER WATTAGE FOR LOWER OUTPUT CURRENTS MJE2955 2N2219 1.5k LT1431 • TA08 5 6 COLL REF LT1431 GND-FGND-S RMIDRTOP 1N4148 LT1006 2 3 – + 4 0.002Ω* 47µF MTP50N05EL MTM25N05L D S G VIN ≥ 5.2V 47µF 5V, 2.5A 12V ILOAD 0.5A MTP50N05EL 47mV 22mV 11.5mV MTM25N05L 145mV 73mV 37mV *1.5" #23 SOLID COPPER WIRE ~0.002Ω → 3A LIMIT Measured Dropout Voltages + + LT1006

Isolated 5V to ± 15V Flyback Converter Fully Loaded Output Ripple vs Filtering 12V to 5V Buck Converter with Foldback Current Limit* Buck Converter Efficiency COLL REF GND-F COMP GND-S RMIDRTOP 1500pF 5 6 VIN VOUT GNDLOGIC IN VIN LT1089 HI-SIDE SWITCH MBR735 100/uni03A9 0.5W PULSE ENGINEERING #PE-51515 5V, 7A 3300µF*CONTACT LTC FOR HIGH EFFICIENCY SWITCHING REGULATORS LT1431 TA09 LT1431 ILOAD (A) EFFICIENCY (%) 3 5 8 LT1431 TA10 1 2 4 6 7 VIN = 9V VIN = 12V VIN = 15V 5 6 REF GND-FGND-S COLL COMP 2.4k 0.1µF 20k 13.3k 2.7k VOUT VCGND VIN LT1172 OR LT1072 1.5k 0.68µF 3k0.47µF 50µF 4.5V TO 5.5V MUR105 4, 5 6, 7 MUR105 C* 15k MUR105 –15V, 70mA 15V, 70mA COILTRONICS CTX02-11934 MEASURED EFFICIENCY LT1172 67.8% AT 2.2W OUT LT1072 68.6% AT 2.2W OUT LT1071 61.1% AT 4.4W OUT LT1431 TA11 LT1431 4N36 210µF 100µF 100µF C* LT1172 30mVP-P LT1072 40mVP-P 6mVP-P 8mVP-P *L BELL INDUSTRIES J.W. MILLER DIVISION 9310-36 10µH, 450mA LT1431 TA12

5V Power Supply Monitor with ± 500mV Window and 50mV Hysteresis T ransfer Function High Efficiency Buck Converter E = 85% to 89% COLL REF GND-F GND-S 10/uni03A9 “HIGH” FOR OVER VOLTAGE OR UNDER VOLTAGE5k 1N4148 COLL REF GND-F GND-S 10/uni03A9 4k*1k6k*1k *DETERMINES WINDOW SIZE V = (R – 5k)(0.5mA) **SETS HYSTERESIS LT1431 TA13 LT1431 LT1431 VIN VOUT 1 2 3 4 LT1431 TA14 5 6 COLL REF RMID 3Q3 2N3904 RTOP R8* 24.9k COMP GND-FGND-S LT1431CN8 + R2 0.1µF 0.047µF 0.033µF R6* 23.7k 2.5A 470µF 16V 0.12/uni03A9 ESR R7* 24.9k

1431 TA15

4.7µF 35V TANT L1 50µH 3A 680/uni03A9 VN2222LL RUN = 0 SHUTDOWN > 3V 100/uni03A9 10k NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTANCES ARE IN /uni03A9, 0.25W, 5% 2. ALL CAPACITANCES ARE IN µF, 50V, 10% 3. SHUTDOWN LOGIC STATE MUST BE DEFINED BY A LOGIC GATE OR BY TYING TO GND RTN OFF VIN BAT85 220µF 35V D3 MBR330 BOLD LINES INDICATE HIGH CURRENT PATHS *1% FILM RESISTORS C1: NICHICON UPL1V221MPH C3, C4, C5: WIMA MKS-2 C6: NICHICON UPL1C471MPH6 D1, D2: PHILIPS BAT85 D3: MOTOROLA MBR330 L1: COILTRONICS CTX50-3-MP LT1170 VIN VCGND VSW FB 3 1

3.6/uni03A9 Q7 Q13 8.5k Q17 COMP COLLECTOR Q14 22pF R12 65pF R13 6.5k R11 11k 10X Q15 Q16 Q21 2.5X GND-FORCE 1pF R17 1.5k R15 R20 45X 6pF LT1431 SD01 2.5k 2.5k Q22 Q20 4X 3X R16 11/uni03A9 Q3 Q11 Q12 Q10 Q18 Q19 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference L TC DWG # 05-08-1110) J8 0801 .014 – .026 (0.360 – 0.660) .200 (5.080) MAX .015 – .060 (0.381 – 1.524) .125 3.175 MIN.100 (2.54) BSC .300 BSC (7.62 BSC) .008 – .018 .045 – .065 (1.143 – 1.651) .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .023 – .045 (0.584 – 1.143) HALF LEAD OPTION CORNER LEADS OPTION (4 PLCS) .005 (0.127) MIN .405 (10.287) MAX .220 – .310 (5.588 – 7.874) 1 2 3 4 8 7 6 5 .025 (0.635) RAD TYP NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS

.065 (1.651) TYP .045 – .065 (1.143 – 1.651) .130 ± .005 (3.302 ± 0.127) .020 (0.508) MIN.018 ± .003 (0.457 ± 0.076) .120 (3.048) MIN .008 – .015 (0.203 – 0.381) .300 – .325 (7.620 – 8.255) .325 +.035 –.015 +0.889 –0.3818.255() 12 3 4 87 6 5 .255 ± .015* (6.477 ± 0.381) .400* (10.160) MAX NOTE: 1. DIMENSIONS ARE INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) .100 (2.54) BSC package DescripTion .016 – .050 (0.406 – 1.270) .010 – .020 0°– 8° TYP .008 – .010 (0.203 – 0.254) SO8 0303 .053 – .069 (1.346 – 1.752) .014 – .019 (0.355 – 0.483) TYP .004 – .010 (0.101 – 0.254) .050 (1.270) BSC 1 2 3 4 .150 – .157 (3.810 – 3.988) NOTE 3 8 7 6 5 .189 – .197 (4.801 – 5.004) NOTE 3 .228 – .244 (5.791 – 6.197) .245 MIN .160 ±.005 RECOMMENDED SOLDER PAD LAYOUT .045 ±.005 .050 BSC .030 ±.005 TYP INCHES (MILLIMETERS) NOTE: 1. DIMENSIONS IN 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 8-Lead PDIP (Narrow .300 Inch) (Reference L TC DWG # 05-08-1510) 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference L TC DWG # 05-08-1610)

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

revision hisTory

REV DATE DESCRIPTION PAGE NUMBER D 4/10 M-grade parts re-released. Obsolete package shading removed. 2, 11 E 7/11 Added L T1431MPS8 to data sheet. Changes reflected throughout. 1 to 14 (Revision history begins at Rev D)

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com  LINEAR TECHNOLOGY CORPORATION 1992 LT 0711 REV E • PRINTED IN USA relaTeD parTs Z Package 3-Lead Plastic TO-92 (Similar to TO-226) (Reference L TC DWG # 05-08-1410 Rev C) package DescripTion .050 (1.27) BSC .060 ± .005 (1.524± 0.127) DIA .90 (2.286) NOM .180 ± .005 (4.572 ± 0.127) .180 ± .005 (4.572 ± 0.127) .500 (12.70) MIN .050 (1.270) MAX UNCONTROLLED LEAD DIMENSION .016 ± .003 (0.406 ± 0.076) NOM BULK PACK .015 ± .002 (0.381 ± 0.051) .060 ± .010 (1.524 ± 0.254) 10° NOM .140 ± .010 (3.556 ± 0.127) Z3 (TO-92) 1008 REV C 3 2 1 .098 +.016/–.04 (2.5 +0.4/–0.1)

2 PLCS

REFER TO TAPE AND REEL SECTION OF LTC DATA BOOK FOR ADDITIONAL INFORMATION PART NUMBER DESCRIPTION COMMENTS L T4430 Secondary-Side Optocoupler Driver with Reference Voltage Overshoot Control Prevents Output Overshoot during Start-Up and Short-Circuit Recovery L T3757/L T3758 Boost, Flyback, SEPIC and Inverting Controller 2.9V/5.5V ≤ V IN ≤ 40V/100V , 100kHz to 1MHz Fixed Frequency, 3mm × 3mm DFN-10 and MSOP-10E Packages L TC3803/L TC3803-3/ L TC3803-5 Flyback DC/DC Controller with Fixed 200kHz or 300kHz Operating Frequency V IN and VOUT Limited by External Components, 6-Pin ThinSOT™ Package L TC3873/L TC3873-5 No R SENSE Constant Frequency Flyback, Boost, SEPIC Controller VIN and VOUT Limited Only by External Components, 8-Pin ThinSOT and 2mm × 3mm DFN-8 Packages L TC3805/L TC3805-5 Adjustable Constant Frequency (70KHz to 700kHz) Frequency Flyback DC/DC Controller VIN and VOUT Limited by External Components, MSOP-10E and 3mm × 3mm DFN-10 Packages L T1952/L T1952-1 Isolated Synchronous Forward Controllers Ideal for Medium Power 24V and 48V Input Applications L TC3723-1/L TC3723-2 Synchronous Push-Pull and Full-Bridge Controllers High Efficiency with On-Chip MOSFET Drivers L TC3721-1/L TC3721-2 Non-Synchronous Push-Pull and Full-Bridge Controllers Minimizes External Components, On-Chip MOSFET Drivers L TC3722/L TC3722-2 Synchronous Isolated Full Bridge Controllers Ideal for High Power 24V and 48V Input Applications