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LM2638 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM2638
Description  Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2638 Datasheet(HTML) 5 Page - National Semiconductor (TI)

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Pin Description
Pin
Pin Name
Pin Function
1
LG
Low side N-FET gate driver output.
2
PGND
Ground for the two FET drivers of the switching section.
3V
DD
Supply for the FET gate drivers. Usually tied to +12V.
4
SNS2
Feedback pin for the 1.5V linear regulator.
5
G2
Gate drive output for the external N-MOS of the fast 1.5V linear regulator.
6
SGND
Ground for internal signal circuitry and system ground reference.
7V
CC
Supply voltage. Usually +5V.
8
SNS1
Output voltage monitor input for the switching regulator.
9
CS+
Switching regulator current sense input, positive node.
10
CS−
Switching regulator current sense input, negative node.
11
CP
Charge pump. Output is a square wave with 50% duty cycle. Amplitude is close to V
CC
voltage.
12
FREQ
Switching frequency adjustment pin. An external resistor is needed to set the desired
frequency.
13
EAO
Output of the error amplifier. Used for compensating the switching regulator.
14
FB
Inverting input of the error amplifier. Used for compensating the switching regulator.
15
PWGD
Open collector Power Good signal.
16
VID4
5-Bit DAC input, MSB.
17
VID3
5-Bit DAC input.
18
VID2
5-Bit DAC input.
19
VID1
5-Bit DAC input.
20
VID0
5-Bit DAC input, LSB.
21
G3
Gate drive pin for the external N-MOS of the 1.25V linear regulator.
22
SNS3
Feedback pin for the 1.25V linear regulator.
23
EN
Output Enable. A logic low shuts the whole chip down.
24
HG
High side N-FET gate driver output.
www.national.com
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