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參數(shù)資料
| 型號(hào)： | LM2631MTCX-ADJ/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 265K |
| 代理商： | LM2631MTCX-ADJ/NOPB |
Connection Diagram and Ordering Information
Pin Description
Pin
Name
Function
1SD
Shutdown control input, active low.
2
SYNC
Oscillator synchronization input. Connect this pin to ground if not used.
3
PGOOD
A constant monitor on the output voltage. PGOOD will go low if the output voltage
exceeds ±9% of its nominal value. Once PGOOD goes low, it will go high if the output
moves within ±3% of its nominal value.
4
SS
The soft-start control pin. A capacitor connected from this pin to ground sets the ramp
time to full current output.
5
COMP
Compensation network connection (connected to the output of the voltage error
amplifier).
6
FB
Output voltage feedback input (connected to the center of the external resistor divider).
7
FADJ
Frequency adjustment input.
8
VREF
The output of the precision reference.
9
GND
Low-noise analog ground.
10
CSH
Current-sense positive input.
11
CSL
Current-sense negative input.
12
NC
No internal connection.
13
V
IN
Main power supply pin.
14
NC
No internal connection.
15
FPWM
When FPWM is high, pulse-skipping mode operation at light load is disabled. The
converter is forced to operate in constant frequency mode.
16
PGND
Power ground.
17
LDRV
Low-side gate-drive output.
18
CBOOT
Bootstrap capacitor connection for high-side gate drive.
19
SW
Switched-node connection, which is connected with the source of the high-side
MOSFET.
20
HDRV
High-side gate-drive output. HDRV is a floating drive output that rides on SW voltage.
20-Lead TSSOP (MTC)
DS100937-2
Top View
Order Number LM2631MTC-ADJ
See NS Package Number MTC20
www.national.com
6
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