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شماره قطعه NCP1500
شرح مفصل Dual Mode PWM/Linear BUCK Converter
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NCP1500 شرح
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.
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
Low Output Noise
Overall Features
Thermal Shutdown with Hysteresis
Digitally Programmable Output Voltage Between 4 Voltages:
1.0, 1.3, 1.5, and 1.8
Fast Transient Response
Input Voltage Range From 2.7 V to 5.4 V
Space Saving Micro8 Package
Low Shutdown Current of 0.18 mA Typical
Pb−Free Package is Available
Typical Applications
Baseband Supplies for Portable Handsets
PDAs
Supplies for DSP Circuitry
L
COUT
1 SHD
2 SYN
3 VO
4 LX
MBRM120
CB0 8
CB1 7
GND 6
VIN 5
CIN VIN
L = 15 mH
CIN = 10 mF
COUT = 10 mF
Figure 1. Typical Operating Circuit
© Semiconductor Components Industries, LLC, 2004
February, 2004 − Rev. 4
1
http://onsemi.com
8
1
MARKING
DIAGRAM
Micro8t
(MSOP−8)
DM SUFFIX
CASE 846A
8
1500
AYW
1
A = Assembly Location
Y = Year
W = Work Week
PIN CONNECTIONS
SHD
SYN
VO
LX
1
2
3
4
(Top View)
8 CB0
7 CB1
6 GND
5 VIN
ORDERING INFORMATION
Device
Package
Shipping
NCP1500DMR2
Micro8
4000 Tape/Reel
NCP1500DMR2G Micro8
(Pb−Free)
4000 Tape/Reel
†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.
Publication Order Number:
NCP1500/D

قانون اساسیصفحه 12
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