Single Phase Hysteretic Buck Controller

 

 

The LM27213 is a single-phase synchronous buck regulator

controller designed to fully support a portable microprocessor. On-chip gate drive makes for a compact, single chip

solution. Output currents iexcess of 25 Amps are possible.

The IC employs a current mode hysteretic control mechanism. Inductor current is sensed through a low value sense

resistor.

The LM27213 will operate over ainput voltage range of 5V

to 30V. The output voltage is programmed through 6 Voltage

Identificatio(VID) pins and ranges from 0.700V to 1.708V in

64 steps.

Since the error ithe output voltage directly sets the inductor

current, the dynamic response to a large, fast load transient

is close to a square wave. This is optimal for mode transition

requirements. Also, due to the intrinsic input voltage feedforward characteristic of hysteretic control, the line transient

response is excellent as well.

The IC provides cycle-by-cycle peak current limit, overvoltage protection, and a power good signal. The LM27213

fully supports the Stop CPU and Sleep modes offered by

some processors. Wheenabled, the IC enters a powersaving “diode emulator” mode which helps prolong battery

runtime for portable systems.

The LM27213 also has a soft start feature for the external

adjustment of soft start speed

 

 

Features

Ideal load and line transient responses

5V to 30V input range

On-chip gate drive

Convenient CLK_EN# signal

Input under-voltage lockout

High light-load efficiency

Adjustable analog soft start

Peak current limit

Over-voltage protection

Error correctiofor good static accuracy

±1% DAC accurcy over temperature

Interfaces with the LM2647 system supply

Available iTSSOP or tiny LLP package

Applications

Core voltage supply for Low Power Processors

Low voltage high current buck regulators

Benefits

Single chip core power solution

Minimum output capacitance required

Low cost, compact design

 

 

 

 

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