LTC3561A
1A, 4MHz, Synchronous
Step-Down DC/DC Converter
FEATURES
DESCRIPTION
Uses Tiny Capacitors and Inductor
■ High Frequency Operation: Up to 4MHz
■ Low R
DS(ON) Internal Switches: 0.15Ω
■ High Efficiency: Up to 96%
■ 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: I ≤ 1µA
Q
■ Low Quiescent Current: 330µA
■ Output Voltages from 0.8V to 5V
■ V : 2.5V to 5.5V
IN
■ Small 8-Lead 3mm × 3mm DFN Package
The LTC®3561A is a constant frequency, synchronous
step-down DC/DC converter. Intended for medium power
applications, it operates from a 2.5V 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 1mm or less in height. The output voltage is
adjustable from 0.8V to 5.5V. Internal synchronous power
switches provide high efficiency. The LTC3561A’s current
mode architecture and external compensation allow the
transient response to be optimized over a wide range of
loads and output capacitors.
■
To further maximize battery life, the P-channel MOSFET
is turned on continuously in dropout (100% duty cycle).
In shutdown, the device draws
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