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鈭抌y鈭抍ycle 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
http://onsemi.com
MARKING
DIAGRAM
8
8
1
Micro8t
(MSOP鈭?)
DM SUFFIX
CASE 846A
1
1500
AYW
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Current Mode Control with Cycle鈭抌y鈭扖ycle Current Limit
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Nominal Synchronization Frequency of 270 to 630 kHz
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Built鈭抜n Slope Compensation
Linear Regulator Features
A = Assembly Location
Y = Year
W = Work Week
PIN CONNECTIONS
SHD
SYN
V
O
LX
1
2
3
4
(Top View)
8
7
6
5
CB0
CB1
GND
V
IN
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Low Output Noise
Overall Features
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Thermal Shutdown with Hysteresis
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Digitally Programmable Output Voltage Between 4 Voltages:
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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鈭扚ree Package is Available
ORDERING INFORMATION
Device
NCP1500DMR2
NCP1500DMR2G
Package
Micro8
Micro8
(Pb鈭扚ree)
Shipping
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4000 Tape/Reel
4000 Tape/Reel
Typical Applications
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Baseband Supplies for Portable Handsets
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PDAs
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Supplies for DSP Circuitry
1 SHD
2 SYN
3 V
O
L
C
OUT
4 LX
MBRM120
CB0
CB1
GND
V
IN
8
7
6
5
C
IN
V
IN
鈥燜or information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
L = 15
mH
C
IN
= 10
mF
C
OUT
= 10
mF
Figure 1. Typical Operating Circuit
漏
Semiconductor Components Industries, LLC, 2004
1
February, 2004 鈭?Rev. 4
Publication Order Number:
NCP1500/D
NCP1500DMR2相關型號PDF文件下載
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