n Wide Input Range: 3.1V to 25V
n Two Switching Regulators with 2A Output Capability
n Independent Supply to Each Regulator
n Adjustable/Synchronizable Fixed Frequency
Operation from 250kHz to 1.5MHz
n Antiphase Switching
n Outputs Can be Paralleled
n Independent, Sequential, Ratiometric or Absolute
Tracking Between Outputs
n Independent Soft-Start and Power Good Pins
n Enhanced Short-Circuit Protection
n Low Dropout: 95% Maximum Duty Cycle
n Low Shutdown Current: <10μA
n 20-Lead TSSOP Package with Exposed Leadframe
n DSP Power Supplies
n Disc Drives
n DSL/Cable Modems
n Wall Transformer Regulation
n Distributed Power Regulation
n PCI Cards
, LT, LTC, and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Monolithic Dual Tracking
2A Step-Down Switching
The LT®3510 is a dual current mode PWM step-down
DC/DC converter with two internal 2.5A switches. Inde-
pendent input voltage, feedback, soft-start and power
good pins for each channel simplify complex power
supply tracking/sequencing requirements.
Both converters are synchronized to either a common
external clock input or a resistor programmable ﬁxed
250kHz to 1.5MHz internal oscillator. At all frequencies, a
180° phase relationship between channels is maintained,
reducing voltage ripple and component size. Programmable
frequency allows for optimization between efﬁciency and
external component size.
Minimum input-to-output voltage ratios are improved
by allowing the switch to stay on through multiple clock
cycles, only switching off when the boost capacitor needs
recharging, resulting in ~95% maximum duty cycle.
Each output can be independently disabled using its own
soft-start pin, or by using the SHDN pin the entire part can
be placed in a low quiescent current shutdown mode.
The LT3510 is available in a 20-lead TSSOP package with
exposed leadframe for low thermal resistance.
3.3V and 1.8V Dual 2A Step-Down Converter with Output Tracking
10k 100μF 2A
VOUT = 5V
VOUT = 3.3V
VOUT = 1.8V VOUT = 2.5V
VIN = 12V
IOUT2 = 0A
FREQUENCY = 500kHz
0.5 1 1.5
LOAD CURRENT (A)