LTC3407-2
Dual Synchronous, 800mA, 2.25MHz
Step-Down DC/DC Regulator
FEATURES
DESCRIPTION
High Efficiency: Up to 95%
n Very Low Quiescent Current: Only 40µA
n 2.25MHz Constant-Frequency Operation
n High Switch Current: 1.2A on Each Channel
n No Schottky Diodes Required
n Low R
DS(ON) Internal Switches: 0.35Ω
n Current Mode Operation for Excellent Line
and Load Transient Response
n Short-Circuit Protected
n Low Dropout Operation: 100% Duty Cycle
n Ultralow Shutdown Current: I < 1µA
Q
n Output Voltages from 5V down to 0.6V
n Power-On Reset Output
n Externally Synchronizable Oscillator
n Small Thermally Enhanced MSOP and 3mm × 3mm
DFN Packages
n AEC-Q100 Qualified for Automotive Applications
The LTC®3407-2 is a dual, constant-frequency, synchronous step down DC/DC converter. Intended for low power
applications, it operates from 2.5V to 5.5V input voltage
range and has a constant 2.25MHz switching frequency,
allowing the use of tiny, low cost capacitors and inductors with a profile ≤1.2mm. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 1.2A
power switches provide high efficiency without the need
for external Schottky diodes.
n
APPLICATIONS
PDAs/Palmtop PCs
n Digital Cameras
n Cellular Phones
n Portable Media Players
n PC Cards
n Wireless and DSL Modems
A user selectable mode input is provided to allow the user
to trade-off noise ripple for low power efficiency. Burst
Mode® operation provides high efficiency at light loads,
while pulse-skipping mode provides low noise ripple at
light loads.
To further maximize battery life, the P-channel MOSFETs
are turned on continuously in dropout (100% duty cycle),
and both channels draw a total quiescent current of only
40µA. In shutdown, the device draws
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