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參數(shù)資料
| 型號(hào)： | LM2637M/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | SOIC-24 |
| 文件頁數(shù)： | 16/17頁 |
| 文件大?。?/td> | 803K |
| 代理商： | LM2637M/NOPB |
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
OVP
Over-voltage protection output for the switching regulator. Can be used to fire an external
SCR.
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 2.5V linear regulator.
22
SNS3
Feedback pin for the 2.5V linear regulator.
23
EN
Output Enable. A logic low shuts the whole chip down.
24
HG
High side N-FET gate driver output.
Preferred Startup Timing
10084831
Note: See Start Up section in Application Information.
Applications Information
OVERVIEW
The LM2637 provides control and protection for three volt-
age regulators. Namely, a synchronous buck switching con-
troller and two linear regulator controllers that drive an ex-
ternal N-FET or NPN transistor.
Switching Section — The switching controller features a
VRM-compatible, 5-bit programmable output voltage, over-
current and over-voltage protection, under-voltage latch-off,
a power good signal, and an output enable. The 5-bit DAC
has a typical tolerance of 1%. 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. The over-voltage protection
LM2637
www.national.com
8
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