LTC3548EMSE#TRPB Power Path Management IC Switching Voltage Regulators Dual, Sync. 800mA/400mA, 2.25MHz Step Down in DFN
microchip battery management
,battery charge management ic
LTC3548EMSE#TRPB Power Path Management IC Switching Voltage Regulators Dual, Sync. 800mA/400mA, 2.25MHz Step Down in DFN
FEATURES
n High Efficiency: Up to 95%
n Very Low Quiescent Current: Only 40μA
n Low Output Ripple Burst Mode® Operation n 2.25MHz Constant-Frequency Operation
n High Switch Current: 0.7A and 1.2A
n No Schottky Diodes Required
n Low RDS(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: IQ < 1μA
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
APPLICATIONS
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PDAs/Palmtop PCs
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Digital Cameras
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Cellular Phones
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Portable Media Players
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PC Cards
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Wireless and DSL Modems
DESCRIPTION
The LTC®3548 is a dual, constant-frequency, synchronous step down DC/DC converter. Intended for low power ap- plications, 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 ≤1mm. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 0.7A/1.2A 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 runtime, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent cur- rent of only 40μA. In shutdown, the device draws <1μA.
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