LTC3406B

High Efficiency: Up to 96%
600mA Output Current at V_IN= 3V
2.5V to 5.5V Input Voltage Range
1.5MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 300A
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws <1A Supply Current
Current Mode Operation for Excellent Line and
   Load Transient Response
Overtemperature Protected
Low Profile (1mm) ThinSOT ^TMPackage

Input Supply Voltage .................................. 0.3V to 6V
RUN, V_FB Voltages....................................... 0.3V to V_IN
SW Voltage.................................. 0.3V to (V_IN  + 0.3V)
P-Channel Switch Source Current (DC)...............  800mA
N-Channel Switch Sink Current (DC)...................  800mA

Peak SW Sink and Source Current .........................  1.3A
Operating Temperature Range (Note 2).. 40 C to 85

Junction Temperature (Notes 3, 6)........................ 125

Storage Temperature Range.............  65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C

The LTC^(R) 3406B is a high efficiency monolithic synchro-nous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.5V and 1.8V. Supply current with no load is 300A and drops to <1A in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406B ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout op- eration, extending battery life in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications.

Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feed- back reference voltage. The LTC3406B is available in a low profile (1mm) ThinSOT package. Refer to LTC3406 for ^(R) applications that require Burst Mode  operation.