LINEAR LT3434 Data Handbook/Specifications Sheet
Summary
The LT3434 is a high-performance, 60V step-down switching regulator designed for efficient power conversion in demanding applications, including industrial, automotive, and battery systems. This manual provides comprehensive technical documentation covering electrical specifications, advanced operational features like Burst Mode and Load Dump protection, efficiency graphs, and application guidelines. It is essential reference material for engineers developing reliable high-voltage external power solutions.
Page 1 Text Content
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POW ER LOSS (W
LT3434
High Voltage 3A, 200k Hz Step-Down Switching Regulator with 100µA Quiescent Current FEATURES DESCRIPTIO Wide Input Range: 3.3V to 60V The LT®3434 is a 200k Hz monolithic buck switching 3A Peak Switch Current regulator that accepts input voltages up to 60V. A high Burst Mode® Operation: 100µA Quiescent Current** efficiency 3A, 0.1Ω switch is included on the die along with Low Shutdown Current: IQ < 1µA all the necessary oscillator, control and logic circuitry. Power Good Flag with Programmable Threshold Current mode topology is used for fast transient response Load Dump Protection to 60V and good loop stability.
200k Hz Switching Frequency
Innovative design techniques integrated in a new high
Saturating Switch Design: 0.1Ω
SU PP LY UR RE NT (µ A)
voltage process achieve high efficiency over a wide input
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. Patented circuitry maintains peak switch current
Small 16-Pin Thermally Enhanced TSSOP Package
over the full duty cycle range.* Shutdown reduces input supply current to less than 1µA. External synchronization APPLICATIO can be implemented by driving the SYNC pin with logic-level inputs. A single capacitor from the CSS pin to the output
High Voltage Power Conversion EF FI CI EN CY
provides a controlled output voltage ramp (soft-start). The
14V and 42V Automotive Systems
device also has a power good flag with a programmable
Industrial Power Systems
threshold and time-out, and thermal shutdown protection.
Distributed Power Systems
The LT3434 is available in a 16-pin TSSOP package with
Battery-Powered Systems
exposed pad leadframe for low thermal resistance.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Burst Mode is a registered trademark of Linear Technology Corporation. *Protected by U.S. Patents including 6498466. **See Burst Mode Operation section for conditions.
TYPICAL APPLICATIO
Supply Current vs Efficiency and Power Loss
14V to 3.3V Step-Down Converter with Input Voltage vs Load Current 100µA No Load Quiescent Current
VOUT = 3.3V VIN = 12V
VOUT = 5V
VOUT COUT = 100µF VIN VIN BOOST 3.3V
SHDN EFFICIENCY
100V SW CER LT3434 0.1µF
30MQ100 VOUT = 3.3V
CSS 0.1
VC 4700p F 470p F VBIAS
165k TYPICAL POWER
FB 27p F
10k 1% 100µF LOSS
CT 0.01
PGFB 6.3V
1µF SYNC TANT
GND 1%
3434 TA01 0.0001 0.001 0.01 0.1
INPUT VOLTAGE (V) LOAD CURRENT (A)
3434 TA02a 3434 TA02b
Page Summary Contents For LINEAR LT3434 Data Handbook/Specifications Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 362.01 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What is the maximum input voltage the LT3434 can handle?
The LT3434 accepts input voltages up to 60V.
How does the LT3434 maintain high efficiency during low current periods?
It uses Burst Mode operation for a full duty cycle range and has a very low shutdown current (I < 1µA).
What specialized protection features are included in this device?
It includes Load Dump Protection (up to 60V), thermal shutdown, and can offer programmable Power Good Flag (PGFB) with adjustable thresholds.
Does the LT3434 have an exposed pad for better heat dissipation?
Yes, it features an exposed pad leadframe, which is essential for low thermal resistance.