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LM27213MTDX

更新时间： 2024-10-27 04:44:35

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器
页数	文件大小	规格书
22页	959K
描述
Single Phase Hysteretic Buck Controller

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数据手册

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LM27213MTDX 数据手册

February 2006

LM27213

Single Phase Hysteretic Buck Controller

General Description

Features

n Ideal load and line transient responses

n 5V to 30V input range

The LM27213 is a single-phase synchronous buck regulator

controller designed to fully support a portable microproces-

sor. On-chip gate drive makes for a compact, single chip

solution. Output currents in excess of 25 Amps are possible.

n On-chip gate drive

n Convenient CLK_EN# signal

n Input under-voltage lockout

n High light-load efficiency

n Adjustable analog soft start

n Peak current limit

The IC employs a current mode hysteretic control mecha-

nism. Inductor current is sensed through a low value sense

resistor.

The LM27213 will operate over an input voltage range of 5V

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

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

64 steps.

n Over-voltage protection

n Error correction for good static accuracy

1% DAC accurcy over temperature

Since the error in the 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 feedfor-

ward characteristic of hysteretic control, the line transient

response is excellent as well.

n Interfaces with the LM2647 system supply

n Available in TSSOP or tiny LLP package

Applications

n Core voltage supply for Low Power Processors

n Low voltage high current buck regulators

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

voltage protection, and a power good signal. The LM27213

fully supports the Stop CPU and Sleep modes offered by

some processors. When enabled, the IC enters a power-

saving “diode emulator” mode which helps prolong battery

runtime for portable systems.

Benefits

n Single chip core power solution

n Minimum output capacitance required

n Low cost, compact design

The LM27213 also has a soft start feature for the external

adjustment of soft start speed.

Typical Application

20154330

DS201543

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