LTC3548-2
Dual Synchronous,
Fixed /Adjustable Output, 2.25MHz
Step-Down DC/DC Regulator
DESCRIPTION
FEATURES
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High Efficiency: Up to 95%
1.8V/800mA Fixed Output and 400mA Adjustable
Output Voltage
Only 40μA Quiescent Current (Both Channels)
2.25MHz Constant-Frequency Operation
High Switch Current Limits: 1.2A and 0.7A
No Schottky Diodes Required
Low RDS(ON) Internal Switches: 0.35Ω
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: IQ < 1μA
Power-On Reset Output
Externally Synchronizable Oscillator
Small, Thermally Enhanced 3mm × 3mm DFN Package
APPLICATIONS
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PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Wireless and DSL Modems
The LTC®3548-2 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. For channel 1, the output voltage is
fixed at 1.8V/800mA; for channel 2, the output voltage is
adjustable from 0.6V to VIN Internal synchronous 0.35Ω,
1.2A/0.7A power switches provide high efficiency without
the need for external Schottky diodes.
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 run time, 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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