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NCP1500/D

更新时间： 2024-11-18 23:53:23
品牌 Logo 应用领域
安森美 - ONSEMI 转换器
页数 文件大小 规格书
12页 90K
描述
Dual Mode PWM/Linear BUCK Converter

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NCP1500/D 数据手册

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NCP1500  
Dual Mode PWM/Linear  
BUCK Converter  
The NCP1500 is a dual mode converter that operates as either a  
pulse width modulated (PWM) buck converter or as a linear regulator.  
The converter automatically transitions between the two modes. The  
converter operates as a PWM when a synchronization signal is present  
at the sync input. The converter operates as a linear regulator in the  
absence of a synchronization signal. The PWM mode offers excellent  
performance at normal to heavy loads at the sacrifice of output ripple  
voltage. The linear mode offers excellent noise rejection at the  
sacrifice of system efficiency. The user is able to select which mode  
will give the best performance for a given operating condition.  
Internal protection features include thermal shutdown with hysteresis  
and cycle−by−cycle current limit in the PWM mode. Additionally, the  
converter transitions into PFM mode at very light loads if a  
synchronization signal is present and an output overvoltage condition  
is detected.  
http://onsemi.com  
MARKING  
DIAGRAM  
8
Micro8t  
(MSOP−8)  
DM SUFFIX  
CASE 846A  
1500  
AYW  
8
1
1
A
Y
= Assembly Location  
= Year  
W = Work Week  
PWM Features  
• Current Mode Control with Cycle−by−Cycle Current Limit  
• Nominal Synchronization Frequency of 270 to 630 kHz  
• Built−in Slope Compensation  
Linear Regulator Features  
PIN CONNECTIONS  
• Low Output Noise  
Overall Features  
SHD  
SYN  
1
2
8
7
6
5
CB0  
CB1  
• Thermal Shutdown with Hysteresis  
• Digitally Programmable Output Voltage Between 4 Voltages:  
1.0, 1.3, 1.5, and 1.8  
V
O
GND  
3
4
LX  
V
IN  
(Top View)  
• Fast Transient Response  
• Input Voltage Range From 2.7 V to 5.4 V  
• Space Saving Micro8 Package  
• Low Shutdown Current of 0.18 m A Typical  
• Pb−Free Package is Available  
Typical Applications  
ORDERING INFORMATION  
†
Device  
Package  
Shipping  
NCP1500DMR2  
Micro8  
4000 Tape/Reel  
4000 Tape/Reel  
NCP1500DMR2G  
Micro8  
• Baseband Supplies for Portable Handsets  
• PDAs  
(Pb−Free)  
• Supplies for DSP Circuitry  
†For information on tape and reel specifications,  
including part orientation and tape sizes, please  
refer to our Tape and Reel Packaging Specifications  
Brochure, BRD8011/D.  
SHD  
SYN  
CB0  
CB1  
GND  
1
2
8
7
6
5
V
O
3
4
LX  
V
IN  
L
C
V
IN  
C
MBRM120  
IN  
OUT  
L = 15 m H  
C
C
= 10 m F  
= 10 m F  
IN  
OUT  
Figure 1. Typical Operating Circuit  
Semiconductor Components Industries, LLC, 2004  
1
Publication Order Number:  
February, 2004 − Rev. 4  
NCP1500/D  
 
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