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参数资料
| 型号： | LM3102TLX-1 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PBGA28 |
| 封装： | USMD-28 |
| 文件页数： | 14/20页 |
| 文件大小： | 623K |
| 代理商： | LM3102TLX-1 |
Pin Descriptions
Pin
Ball
Name
Description
Application Information
1,9,10,12,19,
20
N/C
No Connection
These pins must be left unconnected.
2, 3
A2, A3, B2,
B3, C2, C3,
D2, D3, D4
SW
Switching Node
Internally connected to the source of the main
MOSFET and the drain of the Synchronous
MOSFET. Connect to the inductor.
4, 5
A4, B4
VIN
Input supply voltage
Supply pin to the device. Nominal input range is
4.5V to 42V.
6
C4
BST
Connection for bootstrap
capacitor
Connect a 33 nF capacitor from the SW pin to
this pin. An internal diode charges the capacitor
during the main MOSFET off-time.
7
E3, E4, F1,
F2, F3, G3
AGND
Analog Ground
Ground for all internal circuitry other than the
PGND pin.
8
G2
SS
Soft-start
An 8 A internal current source charges an
external capacitor to provide the soft- start
function.
11
GND
Ground
Must be connected to the AGND pin for normal
operation. The GND and AGND pins are not
internally connected.
13
G1
FB
Feedback
Internally connected to the regulation and over-
voltage comparators. The regulation setting is
0.8V at this pin. Connect to feedback resistors.
14
G4
EN
Enable pin
Connect a voltage higher than 1.26V to enable
the regulator.
15
F4
RON
On-time Control
An external resistor from the VIN pin to this pin
sets the main MOSFET on-time.
16
E1, E2
VCC
Start-up regulator Output
Nominally regulated to 6V. Connect a capacitor
of not less than 680 nF between the VCC and
AGND pins for stable operation.
17, 18
A1, B1, C1,
D1
PGND
Power Ground
Synchronous MOSFET source connection. Tie
to a ground plane.
EP
Exposed Pad
Thermal connection pad. Connect to the ground
plane.
3
www.national.com
LM3102
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