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Microsemi - SINGLE CHANNEL MOBILE PWM AND LDO CONTROLLER

Numéro de référence NX2139A
Description SINGLE CHANNEL MOBILE PWM AND LDO CONTROLLER
Fabricant Microsemi 
Logo Microsemi 





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NX2139A fiche technique
NX2139A
SINGLE CHANNEL MOBILE PWM AND LDO CONTROLLER
PRODUCTION DATA SHEET
DESCRIPTION
The NX2139A controller IC is a compact Buck control-
ler 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-synchronous mode to improve the efficiency at light
n
n
n
n
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load.Constant on time control provides fast response,
good line regulation and nearly constant frequency un-
n
der wide voltage input range. The NX2139 A controller
is optimized to convert single supply up to 22V bus
voltage to as low as 0.75V output voltage. Over cur-
rent protection and FB UVLO followed by latch fea-
ture. A built-in LDO controller can drive an external N-
MOSFET to provide a second output voltage from ei-
ther PWM output source or other power source. Both
PWM controller and LDO controller have separate EN
n
n
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feature. Other features includes: 5V gate drive capa-
bility, power good indicator, over voltage protection, n
internal Boost schottky diode and adaptive dead band n
control.
n
n
Pb Free Product
FEATURES
Internal Boost Schottky Diode
Ultrasonic mode operation available
Bus voltage operation from 4.5V to 22V
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
LDO controller with seperate enable
Two independent 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
PGOOD
5V
4 PGOOD
100k
9 PVCC
10 2 VCC
1u 1u
15
ENSW
/MODE
TON 16
1MEG
1n
VIN 7V~22V
2x10uF
HDRV 12
BST 13 2.2
SW 11
IRF7807
1u
1.5uH
LDRV 8
AO4714
Vout 1.8V/7A
2R5TPE330MC
330uF
OCSET 10
5k
VOUT 1
FB 3
330p
10.5k
7.5k
14
ENLDO
LDODRV 7
50
1n
M3
SI4800
1.5V@2A
5V
100k
LDOPG
5 LDOPG
33n
LDOFB 6
GND
PAD
20k
7.5k
7.5k
2x10uF
Figure1 - Typical application of NX2139A
ORDERING INFORMATION
Device
Temperature
Package
NX2139ACMTR -10 o C to 100o C 3X3 MLPQ-16L
Pb-Free
Yes
Rev. 2.4
06/13/12
1

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