LM27213

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SNVS377A – FEBRUARY 2006 – REVISED MARCH 2013

LM27213 Single Phase Hysteretic Buck Controller

Check for Samples: LM27213

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FEATURES

DESCRIPTION

The LM27213 is a single-phase synchronous buck

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•

Ideal Load and Line Transient Responses

regulator controller designed to fully support a

•

5V to 30V Input Range

portable microprocessor. On-chip gate drive makes

•

On-Chip Gate Drive

for a compact, single chip solution. Output currents in

excess of 25 Amps are possible.

•

Convenient CLK_EN# Signal

•

Input Under-Voltage Lockout

The IC employs a current mode hysteretic control

mechanism. Inductor current is sensed through a low

•

High Light-Load Efficiency

value sense resistor.

•

Adjustable Analog Soft Start

The LM27213 will operate over an input voltage

•

Peak Current Limit

range

of

5V

to

30V.

The

output

voltage

is

•

Over-Voltage Protection

programmed through 6 Voltage Identification (VID)

•

Error Correction for Good Static Accuracy

pins and ranges from 0.700V to 1.708V in 64 steps.

•

±1% DAC Accuracy Over Temperature

Since the error in the output voltage directly sets the

inductor current, the dynamic response to a large,

•

Interfaces with the LM2647 System Supply

fast load transient is close to a square wave. This is

•

Available in TSSOP or WQFN Packages

optimal for mode transition requirements. Also, due to

the intrinsic input voltage feedforward characteristic of

APPLICATIONS

hysteretic control, the line transient response is

•

Core Voltage Supply for Low Power

excellent as well.

Processors

The IC provides cycle-by-cycle peak current limit,

•

Low Voltage High Current Buck Regulators

over-voltage protection, and a power good signal.

The LM27213 fully supports the Stop CPU and Sleep

Benefits

modes offered by some processors. When enabled,

•

Single Chip Core Power Solution

the IC enters a power-saving “diode emulator” mode

•

Minimum Output Capacitance Required

which helps prolong battery runtime for portable

systems.

•

Low Cost, Compact Design

The LM27213 also has a soft start feature for the

external adjustment of soft start speed.

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PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.