NX2141 Datasheet, PDF (1/21 Pages) Microsemi Corporation – SINGLE CHANNEL MOBILE PWM CONTROLLER WITH FEEDFORWARD AND ENABLE

NX2141
SINGLE CHANNEL MOBILE PWM CONTROLLER WITH
FEEDFORWARD AND ENABLE
ADVANCE DATA SHEET
Pb Free Product
DESCRIPTION
FEATURES
The NX2141 controller IC is a compact synchronous Buck n Bus voltage operation from 7V to 24V
controller IC designed for step down DC to DC con- n Less than 1uA shutdown current with Enable low
verter applications with voltage feedforward functionality. n Excellent dynamic response with input voltage feed-
Voltage feedforward provides fast response, good line forward and voltage mode control
regulation and nearly constant power stage gain under n Internal Digital Soft Start Function
wide voltage input range. The NX2141 controller is opti- n Fixed internal hiccup current limit
mized to convert single supply up to 24V bus voltage to n FB UVLO followed by hiccup feature
as low as 0.8V output voltage. Internal UVLO keeps the n Power Good indicator available
regulator off until the supply voltage exceeds 7V where n Start into precharged output
internal digital soft starts get initiated to ramp up output. n Pb-free and RoHS compliant
The NX2141 employs fixed current limiting and FB UVLO
followed by hiccup feature. Other features includes: 5V
gate drive capability , Adaptive dead band control, avail- n
able in 16 lead MLPQ and 10 lead MSOP package. n
n
APPLICATIONS
Notebook PC
Graphic Card on board converters
On board DC to DC such as
12V to 3.3V, 2.5V or 1.8V
n Set Top Box and LCD Display
TYPICAL APPLICATION
Vin1
1uH
+8 to 20V
100uF
1uF
MBR0530T1
25TQC33M
25V,33uF
Vin2
+5V
1uF
13
8
16
10
1uF
PVCC VIN
14 _VCC
BST
Hdrv ¹
0.1uF
M1
10k
ON
OFF
5 _PGOOD
9 _EN
SW ¹⁵
12 _COMP
2.3k
1nF
15nF
11 _FB
Pgnd
2
Ldrv ³
Gnd
17
1uH
M2 1.5k
2.2nF
Vout
+1.05V 10A
Co
2*2R5TPE220MC
(220uF,12mohm)
10k
32k
Figure1 - Typical application of NX2141(MLPQ)
ORDERING INFORMATION
Device
NX2141CMTR
NX2141CUTR
Temperature
-40^o C to 85^o C
-40^o C to 85^o C
Package
MLPQ-16L
MSOP-10L
Frequency
200kHz
200kHz
Pb-Free
Yes
Yes
Rev. 1.6
1
05/15/07