LM2727, LM2737
www.ti.com SNVS205D – AUGUST 2002 – REVISED MARCH 2013 LM2727/LM2737 N-Channel FET Synchronous Buck Regulator Controller for Low Output
Voltages
Check for Samples: LM2727, LM2737 FEATURES DESCRIPTION The LM2727 and LM2737 are high-speed,
synchronous, switching regulator controllers. They
are intended to control currents of 0.7A to 20A with
up to 95% conversion efficiencies. The LM2727
employs output over-voltage and under-voltage latchoff. For applications where latch-off is not desired, the
LM2737 can be used. Power up and down
sequencing is achieved with the power-good flag,
adjustable soft-start and output enable features. The
LM2737 and LM2737 operate from a low-current 5V
bias and can convert from a 2.2V to 16V power rail.
Both parts utilize a fixed-frequency, voltage-mode,
PWM control architecture and the switching
frequency is adjustable from 50kHz to 2MHz by
adjusting the value of an external resistor. Current
limit is achieved by monitoring the voltage drop
across the on-resistance of the low-side MOSFET,
which enhances low duty-cycle operation. The wide
range of operating frequencies gives the power
supply designer the flexibility to fine-tune component
size, cost, noise and efficiency. The adaptive, nonoverlapping MOSFET gate-drivers and high-side …
