
Oskar-Messter-Straße 24
85737 Ismaning, de
http://www.linear.com
Doug Dickinson
+1 (408) 432-1900 ext 2233
Quad Synchronous Step-Down DC/DC Converter Delivers Independent 300mA, 2 x 200mA & 100mA Outputs from a 3mm x 3mm QFN
The LTC3544's Burst Mode® operation minimizes quiescent current to only 70uA total for all four channels under no load conditions. For applications that require the lowest noise possible, the LTC3544B uses a pulse skipping mode in lieu of Burst Mode operation for lowest output ripple. Both devices deliver efficiencies as high as 95% and offer shutdown current less than 1uA. The LTC3544 and LTC3544B utilize low dropout 100% duty cycle operation, allowing output voltages equal to VIN, further extending battery run-time. Each channel has independent enable pins and internal soft-start, further enhancing design flexibility. Other features include short-circuit protection and over-temperature protection.
The LTC3544EUD and LTC3544BEUD are both available from stock in 16-lead 3mm x 3mm QFN packages.
- High Efficiency: Up to 95%
- Four Independent Regulators Provide Up to 300mA, 200mA, 200mA & 100mA Output Current
- 2.25V to 5.5V Input Voltage Range
- 2.25MHz Constant Frequency Operation
- No Schottky Diodes Required
- Low Dropout Operation: 100% Duty Cycle
- Low Ripple (
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