Datasheet > LM27212SQ

LM27212SQ

更新时间： 2024-11-21 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
23页	1061K
描述
Two-Phase Current-Mode Hysteretic Buck Controller

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LM27212SQ 数据手册

March 2006

LM27212

Two-Phase Current-Mode Hysteretic Buck Controller

The LM27212 also has a soft start pin for the external

adjustment of soft start speed.

General Description

The LM27212 is a two-phase synchronous buck regulator

The LM27212 combined with the LM27222 series of MOS-

controller that is designed to support high-current loads such

FET drivers, provides a layout-friendly, thermally optimized

as microprocessors.

and noise-immune power solution for the mobile platform.

The IC employs a two-phase current-mode hysteretic control

mechanism. During normal operation, the two switching

channels operate 180˚ out of phase, helping reduce the

Features

n 5V to 30V input range

number of input capacitors.

n Two channels operating 180˚ out of phase

n Ideal load and line transient responses

n Dynamic output voltage swing supported

n Excellent inductor current sharing

n High efficiency Sleep mode

Inductor currents are sensed through low value sense resis-

tors. Current sharing between the two channels is automati-

cally guaranteed by multiplexing the feedback comparator.

The regulator input voltage range supported by the LM27212

is 5V to 30V. The output voltage is programmed through six

voltage identification pins and ranges from 0.700V to 1.708V

in 64 steps.

n Soft start and soft shutdown

n Cycle-by-cycle current limit

The IC provides accurate load-line characteristic. The regu-

lator can be programmed to lower its output voltage linearly

with increasing load current, so that the power generated by

the load can be significantly reduced.

n Adjustable over-voltage protection

n Accurate load-line supported

1% reference over temperature

n On/off pin and power good signal

Since the error in the output voltage directly sets the inductor

currents, the dynamic response to a large and fast load

transient is close to a square wave. This is optimal for

meeting CPU supply voltage specifications.

n TSSOP package or tiny LLP package

Applications

n Power Supply For Mobile CPUs

n Low Output Voltage Buck Regulators Up To 50A

Due to the intrinsic input voltage feed forward characteristic

of a peak current-mode controller, the IC has a superior line

transient response.

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

voltage protection, and a power good signal.

The LM27212 fully supports the Stop CPU mode and Sleep

mode required by some mobile CPUs. In the Sleep mode,

the IC enters single-phase power-saving operation which

significantly enhances the light load efficiency.

Typical Application

20152031

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与LM27212SQ相关器件

型号	品牌	获取价格	描述	数据表
LM27212SQX	NSC	获取价格	Two-Phase Current-Mode Hysteretic Buck Controller
LM27213	NSC	获取价格	Single Phase Hysteretic Buck Controller
LM27213	TI	获取价格	LM27213 Single Phase Hysteretic Buck Controller
LM27213_15	TI	获取价格	LM27213 Single Phase Hysteretic Buck Controller
LM27213MTD	NSC	获取价格	Single Phase Hysteretic Buck Controller
LM27213MTD/NOPB	TI	获取价格	LM27213 Single Phase Hysteretic Buck Controller
LM27213MTDX	NSC	获取价格	Single Phase Hysteretic Buck Controller
LM27213MTDX/NOPB	TI	获取价格	LM27213 Single Phase Hysteretic Buck Controller
LM27213SQ	NSC	获取价格	Single Phase Hysteretic Buck Controller
LM27213SQ/NOPB	TI	获取价格	LM27213 Single Phase Hysteretic Buck Controller

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