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NX2154A PDF预览

NX2154A

更新时间: 2024-11-02 06:00:43
品牌 Logo 应用领域
美高森美 - MICROSEMI 控制器
页数 文件大小 规格书
17页 556K
描述
300kHz SYNCHRONOUS PWM CONTROLLER

NX2154A 数据手册

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Evaluation board available.  
NX2154/2154A  
300kHz SYNCHRONOUS PWM CONTROLLER  
PRELIMINARY DATA SHEET  
Pb Free Product  
FEATURES  
DESCRIPTION  
n
Bus voltage operation from 2V to 40V  
The NX2154/2154A 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 40V to outputs as low as 0.8V voltage.  
The NX2154/2154A operates at fixed 300kHz. The  
NX2154/2154A employs fixed loss-less current limiting  
by sensing the Rdson of synchronous MOSFET followed  
by hiccup feature.NX2154A has higher current limit  
threshold than NX2154. Feedback under voltage also  
triggers hiccup.  
n Fixed 300kHz voltage mode controller  
n Internal Digital Soft Start Function  
n Prebias Startup  
n Less than 50 nS adaptive deadband  
n
n
Current limit triggers hiccup by sensing Rdson of  
Synchronous MOSFET  
No negative spike at Vout during startup and  
shutdown  
n Pb-free and RoHS compliant  
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.  
APPLICATIONS  
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  
n
n
Set Top Box  
TYPICAL APPLICATION  
Vin  
Vin  
+33V  
+5V  
MBR0530T1  
1uF  
50ME180WX  
1uF  
5
1
BST  
Vcc  
0.1uF  
M1A STM6920  
15uH  
7
2
Comp  
Hdrv  
M3  
12nF  
HI=SD  
Vout  
+5V,3A  
82pF  
8
4
SW  
Ldrv  
13.3k  
6
M1B  
6ME1000WG(1000uF,30mohm)  
Fb  
Gnd  
3
1k  
191  
Figure1 - Typical application of 2154  
ORDERING INFORMATION  
Device  
NX2154CSTR  
NX2154ACSTR  
Temperature  
0 to 70oC  
0 to 70o C  
Package  
SOIC-8L  
SOIC-8L  
Frequency  
300kHz  
300kHz  
OCP Threshold  
360mV  
Pb-Free  
Yes  
Yes  
540mV  
Rev.1.2  
02/26/07  
1

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