LINEAR LTC3425 Data Sheet User Manual
Summary
Technical datasheet for Linear Technology LTC3425 5A, 8MHz, 4-phase synchronous step-up DC/DC converter capable of operation below 1V input. Features four N-channel MOSFET switches and four P-channel synchronous rectifiers for effective RDS(ON) of 0.045Ω and 0.05Ω respectively, 4-phase operation greatly reducing peak inductor currents and capacitor ripple current while increasing effective switching frequency to minimize inductor and capacitor sizes. Provides true output disconnect eliminating i
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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 LTC3425 Data Sheet User Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 301.74 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What is the maximum continuous output current?
The device can provide up to 3A of continuous output current.
How efficient is the LTC3425 converter?
It provides high efficiency, achieving up to 95% efficiency in typical operation.
Are external Schottky diodes required for most applications?
No, external Schottky diodes are generally not needed in most applications where V < 4.3V.
What is the usable input voltage range?
The device supports a wide power input range from 2V to 6V (operating ambient temperature range).
Does it have adjustable operation modes?
Yes, it features adjustable output voltage and allows for both fixed and variable frequency operation.