LTC3411A
1.25A, 4MHz, Synchronous
Step-Down DC/DC Converter
FEATURES
DESCRIPTION
Uses Tiny Capacitors and Inductor
nn High Frequency Operation: Up to 4MHz
nn Low R
DS(ON) Internal Switches: 0.15Ω
nn High Efficiency: Up to 96%
®
nn Selectable Low Ripple (25mV
P-P) Burst Mode
Operation: IQ = 40µA
nn Stable with Ceramic Capacitors
nn Current Mode Operation for Excellent Line and Load
Transient Response
nn Short-Circuit Protected
nn Low Dropout Operation: 100% Duty Cycle
nn Low Shutdown Current: I ≤ 1µA
Q
nn Output Voltages from 0.8V to 5V
nn Synchronizable to External Clock
nn Supports Prebiased Outputs
nn Small 10-Lead 3mm × 3mm DFN or MSOP Package
The LTC®3411A 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 LTC3411A’s current
mode architecture and external compensation allow the
transient response to be optimized over a wide range of
loads and output capacitors.
nn
APPLICATIONS
The LTC3411A can be configured for automatic power
saving Burst Mode operation (IQ = 40µA) to reduce gate
charge losses when the load current drops below the level
required for continuous operation. For reduced noise and
RF interference, the SYNC/MODE pin can be configured
to skip pulses or provide forced continuous operation.
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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