LTC3561
1A, 4MHz, Synchronous
Step-Down DC/DC Converter
U
FEATURES
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DESCRIPTIO
The LTC®3561 is a constant-frequency, synchronous,
step-down DC/DC converter. Intended for medium power
applications, it operates from a 2.63V to 5.5V input voltage
range and has a user configurable operating frequency up
to 4MHz, allowing the use of tiny, low cost capacitors and
inductors 2mm or less in height. The output voltage is
adjustable from 0.8V to 5V. Internal synchronous 0.11Ω
power switches with 1.4A peak current ratings provide
high efficiency. The LTC3561’s current mode architecture
and external compensation allow the transient response
to be optimized over a wide range of loads and output
capacitors.
Uses Tiny Capacitors and Inductor
High Frequency Operation: Up to 4MHz
High Switch Current: 1.4A
Low RDS(ON) Internal Switches: 0.110Ω
High Efficiency: Up to 95%
VIN: 2.63V to 5.5V
Stable with Ceramic Capacitors
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Low Shutdown Current: IQ ≤ 1µA
Low Quiescent Current: 240µA
Output Voltages from 0.8V to 5V
Low Noise Pulse-Skipping Operation
Small 8-Pin DFN Package
To further maximize battery life, the P-channel MOSFET is
turned on continuously in dropout (100% duty cycle). The
no-load quiescent current is only 240µA. In shutdown, the
device draws
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