NX9548 Datasheet, PDF (1/18 Pages) Microsemi Corporation – 9A SINGLE CHANNEL MOBILE PWM SWITCHING REGULATOR

NX9548
9A SINGLE CHANNEL MOBILE PWM SWITCHING REGULATOR
PRELIMINARY DATA SHEET
Pb Free Product
DESCRIPTION
FEATURES
The NX9548 is buck switching converter in multi chip n Internal Boost Schottky Diode
module designed for step down DC to DC converter in n Ultrasonic mode operation available
portable applications. It is optimized to convert single n Bus voltage operation from 4.5V to 24V
supply up to 24V bus voltage to as low as 0.75V output n Less than 1uA shutdown current with Enable low
voltage.The output current can be up to 9A. It can be n Excellent dynamic response with constant on time
selected to operate in synchronous mode or non-syn- control
chronous mode to improve the efficiency at light load. n Selectable between Synchronous CCM mode and
Constant on time control provides fast response, good diode emulation mode to improve efficiency at light
line regulation and nearly constant frequency under wide load
voltage input range. Over current protection and FB UVLO n Programmable switching frequency
followed by latch feature. Other features includes: inter- n Current limit and FB UVLO with latch off
nal boost schottky diode, 5V gate drive capability, power n Over voltage protection with latch off
good indicator, over current protection, over voltage pro-
tection and adaptive dead band control.NX9548 is avail- _n
able in 5x5 MCM package.
n
n
APPLICATIONS
UMPC, Notebook PCs and Desknotes
Tablet PCs/Slates
On board DC to DC such as
12V to 3.3V, 2.5V or 1.8V
n Hand-held portable instruments
TYPICAL APPLICATION
PGOOD
5V
PGOOD
100k
PVCC
10
VCC
1u
1u
ENSW
/MODE
TON
D1
1M
1n
4.7
BST
1u
S1
D2
10k
OCP
VIN 8V~22V
2x10uF
3.3uH
Vout 1.5V/9A
2R5TPE330MC
330uF
Rev.1.6
03/06/09
HG
HDRV
GND
VOUT
FB
S2
330p
7.5k
7.5k
Figure 1 - Typical application of 9548
ORDERING INFORMATION
Device
NX9548CMTR
Temperature
0 to 70^oC
Package
5X5 MCM-32L
Pb-Free
Yes
1