3A, 2MHz Monolithic
Synchronous Regulator for
DDR/QDR Memory Termination
n High Efﬁciency: Up to 90%
n ±3A Output Current
n Symmetrical Source and Sink Output Current Limit
n Low RDS(ON) Internal Switch: 85mΩ
n No Schottky Diode Required
n 2.25V to 5.5V Input Voltage Range
n VOUT = VREF/2
n ±1% Output Voltage Accuracy
n Programmable Switching Frequency: Up to 2MHz
n Power Good Output Voltage Monitor
n Overtemperature Protected
n Available in 16-Lead TSSOP Exposed Pad Package
n Bus Termination: DDR and QDR™ Memory,
SSTL, HSTL, ...
n Notebook Computers
n Distributed Power Systems
The LTC®3413 is a high efﬁciency monolithic synchro-
nous step-down DC/DC converter utilizing a constant
frequency, current mode architecture. It operates from
an input voltage range of 2.25V to 5.5V and provides a
regulated output voltage equal to (0.5)VREF while sourcing
or sinking up to 3A of output current. An internal voltage
divider reduces component count and eliminates the need
for external resistors by dividing the reference voltage in
half. The internal synchronous power switch with 85mΩ
on-resistance increases efﬁciency and eliminates the need
for an external Schottky diode. Switching frequencies up
to 2MHz are set by an external resistor.
Forced-continuous operation in the LTC3413 reduces
noise and RF interference. Fault protection is provided
by an overcurrent comparator that limits output current
during both sourcing and sinking operations. Adjustable
compensation allows the transient response to be optimized
over a wide range of loads and output capacitors.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178.
L1: VISHAY DALE IHLP-2525CZ-01 0.47
COUT: TDK C4532X5R0J107M
Figure 1a. High Efﬁciency Bus Termination Supply
VIN = 2.5V
f = 1MHz
LOAD CURRENT (A)
Figure 1b. Efﬁciency vs Load Current