LINEAR TECHNOLOGY LT3510 User's Manual
Summary
Achieve robust and reliable dual power conversion with this step-down switching regulator. The LT3510 provides two independent, high-efficiency 2A outputs, optimizing performance across wide input ranges (3.1V–25V). Engineered for complex systems like DSP supplies, disc drives, and modem applications, the unit offers highly synchronized tracking and low dropout performance. This technical resource covers synchronous operational modes, deep dive electrical characteristics, and integration guides necessary for reliable distributed power regulation design.
Page 1 Text Content
LT3510
Monolithic Dual Tracking 2A Step-Down Switching
Regulator
FEATURES DESCRIPTION n Wide Input Range: 3.1V to 25V The LT®3510 is a dual current mode PWM step-down n Two Switching Regulators with 2A Output Capability DC/DC converter with two internal 2.5A switches. Inde- n Independent Supply to Each Regulator pendent input voltage, feedback, soft-start and power n Adjustable/Synchronizable Fixed Frequency good pins for each channel simplify complex power Operation from 250k Hz to 1.5MHz supply tracking/sequencing requirements. n Antiphase Switching
Both converters are synchronized to either a common
n Outputs Can be Paralleled
external clock input or a resistor programmable fi xed
n Independent, Sequential, Ratiometric or Absolute
250k Hz to 1.5MHz internal oscillator. At all frequencies, a
Tracking Between Outputs
180° phase relationship between channels is maintained,
n Independent Soft-Start and Power Good Pins
reducing voltage ripple and component size. Programmable
n Enhanced Short-Circuit Protection
frequency allows for optimization between effi ciency and
n Low Dropout: 95% Maximum Duty Cycle
external component size.
n Low Shutdown Current: <10μA
n 20-Lead TSSOP Package with Exposed Leadframe Minimum input-to-output voltage ratios are improved
by allowing the switch to stay on through multiple clock
APPLICATIONS cycles, only switching off when the boost capacitor needs
recharging, resulting in ~95% maximum duty cycle.
n DSP Power Supplies
n Disc Drives
Each output can be independently disabled using its own
n DSL/Cable Modems FF IC IE
soft-start pin, or by using the SHDN pin the entire part can
n Wall Transformer Regulation
be placed in a low quiescent current shutdown mode.
n Distributed Power Regulation
The LT3510 is available in a 20-lead TSSOP package with
n PCI Cards
exposed leadframe for low thermal resistance.
, LT, LTC, and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION 3.3V and 1.8V Dual 2A Step-Down Converter with Output Tracking VIN
Effi ciency
VIN1 VIN2 61.9k
VOUT = 3.3V
SHDN RT/SYNC VOUT = 5V
BST1 BST2
SW1 SW2
VOUT = 2.5VVOUT = 1.8V
PMEG4005 PMEG4005 B360A B360A
LT3510
VOUT1 IND1 IND2 VOUT2
3.3V VOUT1 VOUT2 1.8V 2A 47μF 100μF24.9k 2A
PG1 PG2 FB1 FB2 VIN = 12V
VC1 VC2 IOUT2 = 0A 470p F SS/TRACK1 SS/TRACK2 470p F FREQUENCY = 500k Hz
LOAD CURRENT (A)
0.1μF 3510 TA01b
TA01a
3510fc
Page Summary Contents For LINEAR TECHNOLOGY LT3510 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 306.18 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What is the maximum output capability of each regulator?
Each dual current mode PWM step-down converter has a 2A output capability.
How do the two converters maintain synchronization?
They maintain an 180° phase relationship (antiphase switching) at all operating frequencies.
What is the span of the adjustable operating frequency?
The internal oscillator allows for operation at frequencies ranging from 250kHz to 1.5MHz.
How can I manage individual outputs during low power states?
Each output can be independently managed using its own SHDN pin or Power Good (PG) pin.
What range of input voltages does the LT3510 support?
The product supports a wide input voltage range from 3.1V to 25V.