nx4108 Microsemi Corporation, nx4108 Datasheet - Page 3

• Manufacturer Part Number: nx4108
• Description: 1a Synchronous Buck Switcher With Fet On Board
• Manufacturer: Microsemi Corporation

PIN DESCRIPTIONS
Rev. 1.7
12/30/09
Current Limit
Current Limit Threshold
Thermal Shutdown
Thermal shutdown trip point
Hysteresis
Internal Switch
Rdson of Control FET
Rdson of Synchronous FET
Enable
En low Threshold voltage
En high Threshold voltage
PIN SYMBOL
GND
VIN
SW
FB
EN
PARAMETER
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
output inductor.
output supply returns, and negative terminals of the input and output capacitors.
resistor dividers to the output of the switching regulators to set the output DC voltage. A
332kohm resistor is recommended to be connected from VOUT and FB .
SW output. Junction of the internal high-side and low-side power MOSFETs, and
Ground Connection for Chip. Connect GND with large copper areas to the input and
Error amplifier inverting input. Error amplifier inverting input. This pin is connected via
Enable input. Set this pin to GND or less than 0.4V will shut down the regulator.
Enable signal can not be high when VIN is low.
Supply voltage input for switcher.
SYM
Analog Mixed Signal Group
PIN DESCRIPTION
Microsemi
Test Condition
Vin=3.3V
Vin=3.3V
Vin=5V
Vin=5V
Min
1.4
TYP
155
400
480
300
360
1.8
15
MAX
NX4108
0.4
mohm
mohm
Units
o
o
V
V
A
C
C
3