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NX2124A fiches techniques PDF

Microsemi - 300kHz SYNCHRONOUS PWM CONTROLLER

Numéro de référence NX2124A
Description 300kHz SYNCHRONOUS PWM CONTROLLER
Fabricant Microsemi 
Logo Microsemi 





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NX2124A fiche technique
Evaluation board available.
NX2124/2124A
300kHz SYNCHRONOUS PWM CONTROLLER
PRODUCTION DATA SHEET
Pb Free Product
DESCRIPTION
FEATURES
The NX2124/2124A controller IC is a synchronous Buck
controller IC designed for step down DC to DC con-
verter applications. It is optimized to convert bus volt-
ages from 2V to 25V to outputs as low as 0.8V voltage.
n
n
n
n
Bus voltage operation from 2V to 25V
Fixed 300kHz voltage mode controller
Internal Digital Soft Start Function
Prebias Startup
The NX2124/2124A operates at fixed 300kHz, employs n Less than 50 nS adaptive deadband
fixed loss-less current limiting by sensing the Rdson of n Current limit triggers hiccup by sensing Rdson of
synchronous MOSFET followed by hiccup feature.
NX2124A has higher current limit threshold than NX2124.
n
Synchronous MOSFET
No negative spike at Vout during startup and
Feedback under voltage also triggers hiccup.
Other features of the device are: 5V gate drive, Adaptive
n
shutdown
Pb-free and RoHS compliant
deadband control, Internal digital soft start, Vcc
APPLICATIONS
undervoltage lock out and shutdown capability via the
comp pin.
n
n
Graphic Card on board converters
Memory Vddq Supply in mother board applications
n On board DC to DC such as
5V to 3.3V, 2.5V or 1.8V
n Hard Disk Drive
n Set Top Box
TYPICAL APPLICATION
Vin
+5V
HI=SD
M3
C7
27pF
L2 1uH
C4
100uF
R5 D1
10 MBR0530T1
C3
1uF 5
Vcc
R4
37.4k
7 COMP
1
BST
Hdrv 2
SW 8
C6
0.1uF
C2
2.2nF
6 FB
Ldrv 4
Gnd
3
C5 Cin
1uF 280uF
18mohm
M1
L1 1.5uH
M2
R1
4k
Vout
+1.8V 9A
Co
2 x (1500uF,13mohm)
C1
4.7nF
R2
10k
R3
8k
Figure1 - Typical application of 2124
ORDERING INFORMATION
Device
NX2124CSTR
NX2124ACSTR
Temperature
0 to 70 oC
0 to 70o C
Package
SOIC-8L
SOIC-8L
Frequency
300kHz
300kHz
OCP Threshold
360mV
540mV
Pb-Free
Yes
Yes
Rev.1.9
06/12/12
1

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