Datasheet > LM2633

LM2633

更新时间： 2024-11-22 22:01:47

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器电脑控制器
页数	文件大小	规格书
40页	1348K
描述
Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs

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LM2633 数据手册

August 2001

LM2633

Advanced Two-Phase Synchronous Triple Regulator

Controller for Notebook CPUs

General Description

Features

The LM2633 is a feature-rich IC that combines three regu-

lator controllers - two current mode synchronous buck regu-

lator controllers and a linear regulator controller.

GENERAL

n Three regulated output voltages

n 4.5V to 30V input range

n Power good function

n Input under-voltage lockout

n Thermal shutdown

The two switching regulator controllers operate 180˚ out of

phase. This feature reduces the input ripple RMS current,

resulting in a smaller input filter.

The first switching controller (Channel 1) features an Intel

mobile CPU compatible precision 5-bit digital-to-analog con-

verter which programs the output voltage from 0.925V to

2.00V. It is also compatible with the dynamic VID require-

ments. The second switching controller (Channel 2) is ad-

justable between 1.25V to 6.0V.

n Tiny TSSOP package

SWITCHING SECTION

n Two channels operating 180˚ out of phase

n Separate on/off control for each channel

n Current mode control without sense resistor

n Skip-mode operation available

n Adjustable cycle-by-cycle current limit

n Negative current limit

n Analog soft start independent of input voltage slew rate

n Power ground pins separate

n Output UVP and OVP

Use of synchronous rectification and pulse-skip operation at

light load achieves high efficiency over a wide load range.

Fixed-frequency operation can be obtained by disabling the

pulse-skip mode.

Current-mode feedback control assures excellent line and

load regulation and a wide loop bandwidth for good re-

sponse to fast load transient events. Current mode control is

achieved through sensing the Vds of the top FET and thus

an external sense resistor is not necessary.

n Programmable output UVP delay

n 250kHz switching frequency (for Vin 17V)

n Channel 1 output from 0.925V to 2.00V

A power good signal is available to indicate the general

health of the output voltages.

1.5% DAC accuracy from 0˚C to 125˚C

1.7% initial tolerance for Channel 2

A unique feature is the analog soft-start for the switching

controllers is independent of the slew rate of the input volt-

age. This will make the soft start behavior more predictable

and controllable. An internal 5V rail is available externally for

boot-strap circuitry (only) when no 5V is available from other

sources.

n Dynamic VID change ready

n Power good flags VID changes

n Channel 2 output from 1.3V to 6.0V

LINEAR SECTION

n Output voltage adjustable

n 50mA maximum driving current

n Output UVP

Current limit for either of the two switching channels is

achieved through sensing the top FET V_DSand the value is

adjustable. The two switching controllers have under-voltage

and over-voltage latch protections, and the linear regulator

has under-voltage latch protection. Under-voltage latch can

be disabled or delayed by a programmable amount of time.

2% initial tolerance

Applications

n Power supply for CPUs of notebook PCs that require

The input voltage for the switching channels ranges from 5V

to 30V, which makes possible the choice of different battery

chemistries and options.

™

the SpeedStep technique

n Power supply for information appliances

n General low voltage DC/DC buck regulators

™

SpeedStep is a trademark of Intel Corporation.

DS200008

www.national.com

12 3 4 5 6 7...40

中文翻译

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与LM2633相关器件

型号	品牌	获取价格	描述	数据表
LM2633MTD	NSC	获取价格	Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs
LM2633MTD/NOPB	ROCHESTER	获取价格	SWITCHING CONTROLLER, 275kHz SWITCHING FREQ-MAX, PDSO48, TSSOP-48
LM2635	NSC	获取价格	5-Bit Programmable Synchronous Buck Regulator Controller
LM2635M	NSC	获取价格	5-Bit Programmable Synchronous Buck Regulator Controller
LM2635MX	ETC	获取价格	Voltage-Mode SMPS Controller
LM2635MX/NOPB	TI	获取价格	SWITCHING CONTROLLER, 350kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, SO-20
LM2636	NSC	获取价格	5-Bit Programmable Synchronous Buck Regulator Controller
LM2636M	NSC	获取价格	5-Bit Programmable Synchronous Buck Regulator Controller
LM2636MTC	NSC	获取价格	5-Bit Programmable Synchronous Buck Regulator Controller
LM2636MTC/NOPB	ROCHESTER	获取价格	SWITCHING CONTROLLER, 2000kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, TSSOP-20

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