LINEAR LT3437 Data Sheet / User Manual
Summary
The LT3437 is a high-efficiency, 200kHz monolithic buck switching regulator designed for robust power conversion in demanding environments. It features an ultra-wide input voltage range (3.3V to 60V, with protection up to 80V) and exceptionally low quiescent current (<1µA). This manual provides comprehensive technical details on its performance, covering transient response, burst mode operation, and soft-start capabilities. Ideal for engineers developing sophisticated solutions for Automotive, Industrial, Distributed Power Systems, and battery-powered electronics.
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LT3437
High Voltage 500m A, 200k Hz Step-Down Switching Regulator with 100µA Quiescent Current
FEATURES DESCRIPTIO
Wide Input Range: 3.3V to 60V The LT®3437 is a 200k Hz monolithic buck switching Load Dump (Input Transient) Protection to 80V regulator that accepts input voltages up to 80V. A high 500m A Peak Switch Current efficiency 500m A, 0.8Ω switch is included on the die along Burst Mode® Operation: 100µA Quiescent Current** with all the necessary oscillator, control and logic cir- Low Shutdown Current: IQ < 1µA cuitry. Current mode topology is used for fast transient Burst Mode Operation Defeat response and good loop stability.
200k Hz Switching Frequency
Innovative design techniques along with a new high volt-
Saturating Switch Design: 0.8Ω On-Resistance
age process achieve high efficiency over a wide input
SU PP LY UR RE NT (µ A)
Peak Switch Current Maintained Over
range. Efficiency is maintained over a wide output current
Full Duty Cycle Range*
range by employing Burst Mode operation at low currents,
1.25V Feedback Reference Voltage
utilizing the output to bias the internal circuitry, and by
Easily Synchronizable
using a supply boost capacitor to fully saturate the power
Soft-Start Capability
switch. Burst Mode operation can be defeated by a logic
Small 10-Pin Thermally Enhanced DFN Package
high signal on the SYNC pin which results in lower light load ripple at the expense of light load efficiency. Patented APPLICATIO S circuitry maintains peak switch current over the full duty cycle range.* Shutdown reduces input supply current to
High Voltage Power Conversion
less than 1µA. External synchronization can be imple-
14V and 42V Automotive Systems
mented by driving the SYNC pin with logic-level inputs. A
Industrial Power Systems
single capacitor from the CSS pin to the output provides a
Distributed Power Systems
controlled output voltage ramp (soft-start).
Battery-Powered Systems
The LT3437 is available in a low profile (0.75mm) 3mm ×
Powered Ethernet
3mm 10-pin DFN package or a 16-Pin TSSOP Package
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the both with exposed pad leadframes for low thermal property of their respective owners. *Protected by U.S. Patents including 6498466. **See
Burst Mode Operation section for conditions. resistance.
TYPICAL APPLICATIO
Input Voltage
Supply Current vs Input Voltage Transient Response
14V to 3.3V Step-Down Converter with 100µA No Load Quiescent Current
VIN BOOST 3.3V
4.5V TO 80V* VIN
BAS21 20V/DIV
100V SHDN
CER LT3437 0.1µF
10MQ100N
CSSVC VIN
VBIAS
27p F 165k VOUT
100µF 20m V/DIV SYNC FB 6.3V AC COUPLED
TANT 3437 TA03
GND 100k 50ms/DIVIOUT 250m A
LOAD DUMP COLD CRANK
*FOR INPUT VOLTAGES ABOVE 60V RESTRICTIONS APPLY 3437 TA01
INPUT VOLTAGE (V)
3435 TA02
Page Summary Contents For LINEAR LT3437 Data Sheet / User Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 508.14 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What are the input voltage limits for the LT3437 regulator?
It functions with a wide input range from 3.3V up to 60V, accepting inputs even up to 80V.
How is efficiency maintained during light load conditions?
Burst Mode Operation allows the device to maintain high efficiency over a wide output current full duty cycle range.
Can an external circuit synchronize with this regulator's switching frequency?
Yes, external synchronization can be accomplished by driving the SYNC pin on the chip.
Does the LT3437 protect against sudden input voltage spikes?
It includes High Load Dump (Input Transient) Protection up to 80V.