LINEAR TECHNOLOGY LT3724 User's Manual
Summary
The LT3724 is a high-voltage DC/DC switching regulator controller engineered for robust power management (4V to 60V). This manual details advanced features such as Burst Mode operation, programmable soft-start control, and internal voltage biasing capabilities. It offers reliable solutions for demanding industrial applications, including avionics, telecom power systems, and automotive heavy equipment.
Page 1 Text Content
POW ER LOSS (W
LT3724
High Voltage, Current Mode Switching Regulator Controller
FEATURES DESCRIPTIO Wide Input Range: 4V to 60V The LT®3724 is a DC/DC controller used for medium Output Voltages up to 36V (Step-Down) power, low part count, low cost, high efficiency supplies. Burst Mode® Operation: <100µA Supply Current It offers a wide 4V-60V input range (7.5V minimum startup 10µA Shutdown Supply Current voltage) and can implement step-down, step-up, inverting ±1.3% Reference Accuracy and SEPIC topologies. 200k Hz Fixed Frequency
The LT3724 includes Burst Mode operation, which re-
Drives N-Channel MOSFET
duces quiescent current below 100µA and maintains high
Programmable Soft-Start
efficiency at light loads. An internal high voltage bias
Programmable Undervoltage Lockout
regulator allows for simple biasing and can be back driven
Internal High Voltage Regulator for Gate Drive
to increase efficiency.
Thermal Shutdown
Current Limit Unaffected by Duty Cycle Additional features include fixed frequency current mode 16-Pin Thermally Enhanced TSSOP Package control for fast line and load transient response; a gate driver capable of driving large N-channel MOSFETs; a precision undervoltage lockout function; 10µA shutdown
APPLICATIO S current; short-circuit protection; and a programmable
soft-start function that directly controls output voltage
Industrial Power Distribution
slew rates at startup which limits inrush current, mini-
12V and 42V Automotive and Heavy Equipment
EF FI CI EN CY
mizes overshoot and facilitates supply sequencing.
High Voltage Single Board Systems Distributed Power Systems The LT3724 is available in a 16-lead thermally enhanced Avionics TSSOP package. Telecom Power , 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 property of their respective owners. Protected by U.S. Patents including 5731694, 6498466, 6611131.
TYPICAL APPLICATIO
Efficiency and Power Loss vs Load Current High Voltage Step-Down Regulator
VIN 30V TO 60V CIN VIN BOOST 68µF
1M TG Si7852
EFFICIENCY
LT3724 0.025Ω
10Ω VOUT
SHDN SW 24V
68.1k SS3H9
CSS COUT
200k Burst_EN VCC
VFB PGND LOSS
VC SENSE+ VIN = 48V
SGND SENSE–
LOAD CURRENT (A)
3724 TA01a 3724 TA01b
3724fa
Page Summary Contents For LINEAR TECHNOLOGY LT3724 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 276.26 KB |
| Published | June 22, 2026 |
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Frequently Asked Questions
What is the acceptable input voltage range for this controller?
The LT3724 accepts a wide input voltage range from 4V to 60V.
Does it offer different topographies for power conversion?
Yes, it can implement step-down, step-up, inverting, and SEPIC topologies.
What is the minimum standby current when using Burst Mode?
The continuous supply current in Burst Mode is induced below 100µA.
What features ensure stable operation during voltage fluctuations?
It includes a programmable soft-start function to limit overshoots and reduce inrush current at startup.