Datasheet Analog Devices LTC3544BEUD#PBF

LTC3544B
Quad Synchronous
Step-Down Regulator: 2.25MHz,
300mA, 200mA, 200mA, 100mA
Features Description High Efficiency: Up to 95%
■ Four Independent Regulators Provide Up to 300mA,
200mA, 200mA and 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
■ Pulse Skipping at Low Load for Minimum Ripple
■ 0.8V Reference Allows Low Output Voltages
■ Shutdown Mode Draws 1μF) supply bypass capacitors. The
discharged bypass capacitors are effectively put in parallel
with COUT, causing a rapid drop in VOUT. No regulator can
deliver enough current to prevent this problem if the load
switch resistance is low and it is driven quickly. The only
solution is to limit the rise time of the switch drive so that
the load rise time is limited to approximately (25 • CLOAD).
Thus, a 10μF capacitor charging to 3.3V would require a
250μs rise time, limiting the charging current to about
130mA. 3. Keep C8 and C9 as close to the part as possible. …