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NX2124 参数 Datasheet PDF下载

NX2124图片预览
型号: NX2124
PDF下载: 下载PDF文件 查看货源
内容描述: 300kHz的同步PWM控制器 [300kHz SYNCHRONOUS PWM CONTROLLER]
分类和应用: 控制器
文件页数/大小: 17 页 / 517 K
品牌: MICROSEMI [ MICROSEMI CORPORATION ]
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Evaluation board available.
NX2124/2124A
300kHz SYNCHRONOUS PWM CONTROLLER
PRELIMINARY DATA SHEET
Pb Free Product
DESCRIPTION
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.
The NX2124/2124A operates at fixed 300kHz, employs
fixed loss-less current limiting by sensing the Rdson of
synchronous MOSFET followed by hiccup feature.
NX2124A has higher current limit threshold than NX2124.
Feedback under voltage also triggers hiccup.
Other features of the device are: 5V gate drive, Adaptive
deadband control, Internal digital soft start, Vcc
undervoltage lock out and shutdown capability via the
comp pin.
FEATURES
n
n
n
n
n
n
Bus voltage operation from 2V to 25V
Fixed 300kHz voltage mode controller
Internal Digital Soft Start Function
Prebias Startup
Less than 50 nS adaptive deadband
Current limit triggers hiccup by sensing Rdson of
Synchronous MOSFET
n
No negative spike at Vout during startup and
shutdown
n
Pb-free and RoHS compliant
APPLICATIONS
n
n
n
n
n
Graphic Card on board converters
Memory Vddq Supply in mother board applications
On board DC to DC such as
5V to 3.3V, 2.5V or 1.8V
Hard Disk Drive
Set Top Box
TYPICAL APPLICATION
Vin
+5V
C4
100uF
L2 1uH
C5
1uF
D1
MBR0530T1
1
Cin
280uF
18mohm
R5
10
5
C3
1uF
Vcc
7
BST
Hdrv
2
C6
0.1uF
M1
L1 1.5uH
HI=SD
M3
NX2124
COMP
R4
37.4k
C7
27pF
C2
2.2nF
6
SW
Ldrv
8
4
M2
R1
4k
R2
10k
Co
2 x (1500uF,13mohm)
Vout
+1.8V 9A
FB
Gnd
3
C1
4.7nF
R3
8k
Figure1 - Typical application of 2124
ORDERING INFORMATION
Device
NX2124CSTR
NX2124ACSTR
Rev.1.8
02/28/08
Temperature
0 to 70
o
C
0 to 70
o
C
Package
SOIC-8L
SOIC-8L
Frequency
300kHz
300kHz
OCP Threshold
360mV
540mV
Pb-Free
Yes
Yes
1