LM2638MX

LM2638MX, 24-SOIC, Motherboard Power Supply Solution, 7V, 1.6W

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Price:: US $3.50~4.00 / piece [Get Latest Price]

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PartNumber:: LM2638MX

Brand:: National Semiconductor - NS | Pack: SOP | D/C: 03+

Availability:: Supply Ability: 10000/Week Can Ship Immediately
Delivery: 10-15 Business Days (ships out within 3 Business days)

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Products Upload time: 2012-11-15

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Part Number:LM2638MX
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Product Summary

The LM2638MX is a Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers. The LM2638MX 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 LM2638MX 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. Applications include: Embedded power supplies for motherboards, Triple DC/DC power supplies, and Programmable high current DC/DC power supply.

Parametrics

LM2638MX absolute maximum ratings: (1)VCC: 7V; (2)VDD: 17V; (3)Junction Temperature: 150℃; (4)Power Dissipation: 1.6W; (5)Storage Temperature: 65℃ to +150℃; (6)ESD Susceptibility: 3 kV; (7)Soldering Time, Temperature (10 sec.): 300℃.

Features

LM2638MX features: (1)Provides 3 regulated voltages; (2)Power Good flag and output enable; (3)Charge pump pin Switching Section; (4)Synchronous rectification; (5)5-bit DAC programmable down to 1.3V; (6)Typical ±1% DAC tolerance; (7)Switching frequency: 50 kHz to 1 MHz; (8)Over-voltage protection; (9)Two methods of over-current protection; (10)Adaptive non-overlapping FET gate drives; (11)Soft start without external capacitor Linear Section; (12)N-FET and NPN drive capability; (13)Ultra fast response speed; (14)Under voltage latch-off at 0.63V; (15)Output voltages default to 1.5V and 2.5V yet adjustable.