LINEAR TECHNOLOGY LTC3425 User's Manual
Summary
The LTC3425 is a high-efficiency, synchronous 4-phase boost DC/DC converter designed for sophisticated power management applications. It ensures extremely low output ripple and operates across a wide input range (0.5V to 4.5V). The manual details its advanced features, including adjustable current limiting, built-in fault protection, and customizable operating modes. Ideal for engineers developing miniaturized and powerful devices, such as handheld computers, requiring reliable, regulated power conversion in a compact package.
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LTC3425
5A, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter
FEATURES DESCRIPTIO High Efficiency: Up to 95% The LTC®3425 is a synchronous, 4-phase boost converter Up to 3A Continuous Output Current with output disconnect capable of operation below 1V
4-Phase Operation for Low Output Ripple input. It includes four N-channel MOSFET switches and and Tiny Solution Size four P-channel synchronous rectifiers for an effective Output Disconnect and Inrush Current Limiting RDS(ON) of 0.045Ω and 0.05Ω, respectively. 4-phase
Very Low Quiescent Current: 12µA operation greatly reduces peak inductor currents, and 0.5V to 4.5V Input Range capacitor ripple current, and increases effective switching 2.4V to 5.25V Adjustable Output Voltage frequency, minimizing inductor and capacitor sizes. True Adjustable Current Limit output disconnect eliminates inrush current and allows Adjustable, Fixed Frequency Operation from zero load current in shutdown. External Schottky diodes 100k Hz to 2MHz per Phase are not required in most applications (VOUT < 4.3V). Power Synchronizable Oscillator with Sync Output saving Burst Mode operation can be user controlled or left Internal Synchronous Rectifiers in automatic mode. Manual or Automatic Burst Mode® Operation
Other features include 1µA shutdown current, program-
Power Good Comparator
mable frequency with sync in and out, programmable
<1µA Shutdown Current
soft-start, antiringing control, thermal shutdown, adjust-
Antiringing Control
able current limit, reference output and power good
EF FI CI EN CY
5mm × 5mm Thermally Enhanced QFN Package
comparator.
APPLICATIO S The LTC3425 is available in a small, thermally enhanced
32-pin QFN package.
Handheld Computers
, LTC and LT are registered trademarks of Linear Technology Corporation.
Point-of-Load Regulators Burst Mode is a registered trademark of Linear Technology Corporation. 3.3V to 5V Conversion
TYPICAL APPLICATIO VIN 2V TO 3V
VIN SWA SWB SWC SWD
VOUTS
SHDNOFF ON VOUTA
Burst Mode FIXED
VOUTB
REFOUT OPERATION FREQUENCY
VOUTC VOUT
CCM VOUTD 3.3V
REFEN
LTC3425
SYNCIN
FB 22p F
BURST
VIN = 2.4V
0.01µF RT
SS 330p F 590k VOUT = 3.3V ILIM SYNCOUT f = 1MHz/PHASE
PGOOD 33k L = 2.7µH
SGND GNDA GNDB GNDC GNDD
LOAD CURRENT (m A)
3425 TA01 3425 TA02
CIN: TAIYO YUDEN JMK107BJ225MA L1-L4: TDK RLF5018T-2R7M1R8
COUT: TAIYO YUDEN JMK212BJ475MG (×4)
Page Summary Contents For LINEAR TECHNOLOGY LTC3425 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 272.63 KB |
| Published | June 20, 2026 |
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Frequently Asked Questions
What is the maximum continuous output current?
The device supports up to 3A of continuous output current.
Can this converter operate with a low input voltage range?
Yes, it accepts an input range from 0.5V to 4.5V.
Does the LTC3425 have adjustable frequency operation?
It offers adjustable, fixed frequency operation from zero load current in shutdown.
What kind of shut-down current does it consume?
The device can operate with a minimum shutdown current of 1mA. It also features an ultra-low quiescent current of 12mA operating at burst mode.