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参数资料
| 型号： | LM3668SD-3.3/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.05 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, DSO12 |
| 封装： | ROHS COMPLIANT, LLP-12 |
| 文件页数： | 14/20页 |
| 文件大小： | 2497K |
| 代理商： | LM3668SD-3.3/NOPB |
Connection Diagrams and Package Mark Information
20191402
Top View
20191403
Bottom View
Pin Descriptions
Pin #
Pin Name
Description
1
VOUT
Connect to output capacitor.
2
SW2
Switching Node connection to the internal PFET switch (P2) and
NFET synchronous rectifier (N2).
3
PGND
Power Ground.
4
SW1
Switching Node connection to the internal PFET switch (P1) and
NFET synchronous rectifier (N1).
5
PV
IN
Supply to the power switch, connect to the input capacitor.
6
EN
Enable Input. Set this digital input high for normal operation. For
shutdown, set low.
7
VDD
Signal Supply input. If board layout is not optimum an optional
1F ceramic capacitor is suggested as close to this pin as
possible.
8
NC*
No connect. Connect this pin to GND on PCB layout.
9
SGND
Analog and Control Ground.
10
MODE/SYNC
Mode = LOW, Automatic Mode. Mode= HI, Forced PWM Mode
SYNC = external clock synchronization from 1.6MHz to 2.7MHz
(When SYNC function is used, device is forced in PWM mode).
11
VSEL
Logic input low = 2.8V and logic high = 3.3V to set output Voltage.
12
FB
Feedback Analog Input. Connect to the output at the output filter.
Ordering Information
Order Number
Package
NSC Package
Marking
Supplied As
LM3668SD - 3.3
LLP-12
S016B
1000 units, Tape and Reel
LM3668SDX - 3.3
S016B
4500 units, Tape and Reel
3
www.national.com
LM3668
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