ML4900 datasheet(1/8 Pages) MICRO-LINEAR

Teilenummer	ML4900

Bauteilbeschribung	High Current Synchronous Buck Controller

PDF	8 Pages

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Hersteller	MICRO-LINEAR [Micro Linear Corporation]

Direct Link	http://www.microlinear.com

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July 2000

ML4900*

High Current Synchronous Buck Controller

1

GENERAL DESCRIPTION

The ML4900 high current synchronous buck controller has

been designed to provide high efficiency DC/DC

conversion for next generation processors such as the

Pentium® Pro from Intel®.

The ML4900 controller, when combined with two

N-channel MOSFETs, generates output voltages between

2.1V and 3.5V from a 5V supply. The output voltage is

selected via an internal 4-bit DAC. Output currents in

excess of 14A can be attained at efficiencies greater than

90%.

The ML4900 can be enabled/disabled via the SHDN pin.

While disabled, the output of the regulator is completely

isolated from the circuit’s input supply. The ML4900

employs fixed-frequency PWM control combined with a

dual mode control loop to provide excellent load transient

response.

BLOCK DIAGRAM (Pin Configuration Shown for 16-Pin SOIC Version)

FEATURES

s

Designed to meet Pentium® Pro power supply

requirements

s

DC regulation to +1% maximum

s

Proprietary circuitry provides transient response of +5%

maximum over 300mA to 14A load range

s

Programmable output voltage (2.1V to 3.5V) is set by

an onboard 4-bit DAC

s

Synchronous N-channel buck topology for maximum

power conversion efficiency

s

Fixed frequency operation for easier system integration

s

Integrated antishoot-through logic, short circuit

protection, and UV lockout

s

Shutdown control provides load isolation

(* Indicates Part is End of Life as of July 1, 2000)

3.5V

REFERENCE

7

VREF

GND

N DRV H

N DRV L

ISENSE

PWR GOOD

15

UVLO

13

10

14

6

VDD

+

–

16

PROTECT

+

–

VDAC

1

D0

2

D1

3

D2

4

D3

4 BIT DAC

4.4V

10.5V

4V

8

5

SHDN

+

–

+

–

VFB

VDAC + 3%

VDAC - 3%

+

–

+

–

VFB

VDAC - 3%

VDAC - 10%

VDAC + 3%

VDAC + 10%

VFB

9

PWR GND

12

CONTROL

LOGIC

+

–

-73mV

+

–

VDAC

+

–

COMP

11

200kHz

35µA

+

–

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