NX2138 Datasheet, PDF (1/16 Pages) Microsemi Corporation – SINGLE CHANNEL MOBILE PWM CONTROLLER

NX2138
SINGLE CHANNEL MOBILE PWM CONTROLLER
PRODUCTION DATA SHEET
Pb Free Product
DESCRIPTION
The NX2138 controller IC is a compact Buck controller
IC with 16 lead MLPQ package designed for step down
DC to DC converter in portable applications. It can be
selected to operate in synchronous mode or non-syn-
chronous mode to improve the efficiency at light
n
n
n
n
n
load.Constant on time control provides fast response,
good line regulation and nearly constant frequency un-
n
der wide voltage input range. The NX2138 controller is
optimized to convert single supply up to 24V bus volt-
age to as low as 0.75V output voltage. Over current
protection and FB UVLO followed by latch feature. Other
features includes: internal boost schottky diode, 5V gate
drive capability, power good indicator, over current pro-
tection, over voltage protection and adaptive dead band
n
n
n
n
n
control.
n
n
n
n
FEATURES
Internal boost schottky diode
Ultrasonic mode operation available
Bus voltage operation from 4.5V to 24V
Less than 1uA shutdown current with Enable low
Excellent dynamic response with constant on time
control
Selectable between synchronous CCM mode and
diode emulation mode to improve efficiency at
light load
Programmable switching frequency
Current limit and FB UVLO with latch off
Over voltage protection with latch off
Power good indicator available
Pb-free and RoHS compliant
APPLICATIONS
Notebook PCs and Desknotes
Tablet PCs/Slates
On board DC to DC such as
12V to 3.3V, 2.5V or 1.8V
Hand-held portable instruments
TYPICAL APPLICATION
Rev. 1.6
12/09/09
PGOOD
5V
4 _PGOOD
100k
9 _PVCC
10
2 _VCC
1u
1u
15
ENSW
/MODE
16
TON
1n
1MEG
VIN 7V~22V
2x10uF
HDRV ¹²
BST ^{13 2.2}
1u
SW ¹¹
IRF7807
1.5uH
LDRV ⁸
AO4714
Vout 1.8V/7A
2R5TPE330MC
330uF
2
NC
14
NC
5k
OCSET ¹⁰
VOUT ¹
FB ³
AGND
6
PGND
7
10.5k
7.5k
Figure1 - Typical application of NX2138
ORDERING INFORMATION
Device
Temperature
Package
NX2138CMTR -10^o C to 100^o C 4X4 MLPQ-16L
Pb-Free
Yes
1