1FEATURES
2• Input Power from 2.2V to 16V
• Output Voltage Adjustable Down to 0.6V
• Power Good flag, Adjustable Soft-Start and
Output Enable for Easy Power Sequencing
• Output Over-Voltage and Under-Voltage Latch-
Off (LM2727)
• Output Over-Voltage and Under-Voltage Flag
(LM2737)
• Reference Accuracy: 1.5% (0°C - 125°C)
• Current Limit Without Sense Resistor
• Soft Start
• Switching Frequency from 50 kHz to 2 MHz
• TSSOP-14 Package

APPLICATIONS
• Cable Modems
• Set-Top Boxes/ Home Gateways
• DDR Core Power
• High-Efficiency Distributed Power
• Local Regulation of Core Power

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 latch-
off. 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
bootstrap structure helps to further maximize
efficiency. The high-side power FET drain voltage can
be from 2.2V to 16V and the output voltage is
adjustable down to 0.6V.