Datasheet > LM2638

LM2638

更新时间： 2024-09-08 12:09:43

品牌	Logo	应用领域
德州仪器 - TI		开关控制器
页数	文件大小	规格书
8页	353K
描述
LM2638 Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers

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LM2638 数据手册

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LM2638

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SNVS046A –MAY 2004–REVISED NOVEMBER 2004

LM2638 Motherboard Power Supply Solution with a 5-Bit Programmable Switching

Controller and Two Linear Regulator Controllers

Check for Samples: LM2638

FEATURES

– Linear Section

•

N-FET and NPN drive capability

Ultra fast response speed

2345

•

Provides 3 regulated voltages

Power Good flag and output enable

Charge pump pin

•

Under voltage latch-off at 0.63V

Output voltages default to 1.5V and 2.5V yet

adjustable

–

Switching Section

•

Synchronous rectification

5-bit DAC programmable down to 1.3V

Typical ±1% DAC tolerance

APPLICATIONS

•

Embedded power supplies for motherboards

Triple DC/DC power supplies

Switching frequency: 50 kHz to 1 MHz

Over-voltage protection

Programmable high current DC/DC power

supply

Two methods of over-current protection

Adaptive non-overlapping FET gate drives

Soft start without external capacitor

DESCRIPTION

The LM2638 provides a comprehensive embedded power supply solution for motherboards hosting high

performance MPUs such as Pentium™ II, M II™, K6™-2 and other similar high performance MPUs. The LM2638

incorporates a 5-bit programmable, synchronous buck switching controller and two high-speed linear regulator

controllers in a 24-pin SO package. In a typical application, the switching controller supplies the MPU core, and

the linear regulator controllers supply the GTL+ bus and the clock or graphics chip core. A charge pump pin

helps provide the necessary voltage to power the linear sections when 12V is shut off during system standby

such as STR mode.

Switching Section — The switching regulator controller features an Intel-compatible, 5-bit programmable output

voltage, over-current and over-voltage protection, a power good signal, and a logic-controlled output enable.

There are two user-selectable over-current protection methods. One provides accurate over-current protection

with the use of an external sense resistor. The other saves cost by taking advantage of the r_{DS_ON}of the high-

side FET. When there is an over voltage, the controller turns off the high side FET and turns on the low side.

Linear Section — The two linear regulator controllers feature wide control bandwidth, N-FET and NPN transistor

driving capability and an adjustable output. The wide control bandwidth makes meeting the GTL+ bus transient

response requirement an easy job. In minimum configuration, the two controllers default to 1.5V and 1.25V

respectively.

Both linear controllers have under voltage latch-off.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

K6 is a trademark of Advanced Micro Devices, Inc..

M II is a trademark of Cyrix Corporation.

Pentium is a trademark of Intel Corporation.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7 8

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与LM2638相关器件

型号	品牌	获取价格	描述	数据表
LM2638M	NSC	获取价格	Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two L
LM2638M/NOPB	TI	获取价格	SWITCHING CONTROLLER, 286kHz SWITCHING FREQ-MAX, PDSO24, SOIC-24
LM2638MX	TI	获取价格	LM2638 Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller an
LM2639	NSC	获取价格	5-Bit Programmable, High Frequency Multi-phase PWM Controller
LM2639M	NSC	获取价格	5-Bit Programmable, High Frequency Multi-phase PWM Controller
LM2639M/NOPB	TI	获取价格	SWITCHING CONTROLLER, 8700kHz SWITCHING FREQ-MAX, PDSO24, PLASTIC, SOIC-24
LM2639MDC	NSC	获取价格	IC SWITCHING CONTROLLER, 8700 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or Con
LM2639MWC	NSC	获取价格	IC SWITCHING CONTROLLER, 8700 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator or C
LM2639MX	ETC	获取价格	Voltage-Mode SMPS Controller
LM2640	NSC	获取价格	Dual Adjustable Step-Down Switching Power Supply Controller

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