NCP1530
600 mA PWM/PFM
Step鈭扗own Converter with
External Synchronization Pin
The NCP1530 is a PWM/PFM non鈭抯ynchronous step鈭抎own
(Buck) DC鈭扗C converter for usage in systems supplied from 1鈭抍ell
Li鈭抜on, or 2 or more cells Alkaline/NiCd/NiMH batteries. It can
operate in Constant鈭扚requency PWM mode or PWM/PFM mode in
which the controller will automatically switch to PFM mode
operation at low output loads to maintain high efficiency. The
switching frequency can also be synchronized to external clock
between 600 kHz and 1.2 MHz. The maximum output current is up
to 600 mA. Applying an external synchronizing signal to SYN pin
can supersede the PFM operation.
The NCP1530 consumes only 47
mA
(typ) of supply current
(V
OUT
= 3.0 V, no switching) and can be forced to shutdown mode by
bringing the enable input (EN) low. In shutdown mode, the regulator
is disabled and the shutdown supply current is reduced to
0.5
mA
(typ). Other features include built鈭抜n undervoltage lockout,
internal thermal shutdown, an externally programmable soft鈭抯tart
time and output current limit protection. The NCP1530 operates
from a maximum input voltage of 5.0 V and is available in a space
saving, low profile Micro8鈩?package.
Features
http://onsemi.com
MARKING
DIAGRAM
Micro8]
DM SUFFIX
CASE 846A
1
xxxx
ALYW
8
xxxx
A
L
Y
W
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
PIN CONNECTIONS
V
IN
SYN
SS
GND
1
2
3
4
(Top View)
8
7
6
5
LX
V
REF
V
OUT
EN
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Pb鈭扚ree Package is Available
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High Conversion Efficiency, up to 92% at V
IN
= 4.3 V,
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V
OUT
= 3.3 V, I
OUT
= 300 mA
Current鈭扢ode PWM Control
Automatic PWM/PFM Mode for Current Saving at Low Output Loads
Internal Switching Transistor Support 600 mA Output Current
(V
IN
= 5.0 V, V
OUT
= 3.3 V)
High Switching Frequency (600 kHz), Support Small Size Inductor
and Capacitor, Ceramic Capacitors Can be Used
Synchronize to External Clock Signal up to 1.2 MHz
100% Duty Cycle for Maximum Utilization of the Supply Source
Programmable Soft鈭扴tart Time through External Chip Capacitor
Externally Accessible Voltage Reference
Built鈭捍n Input Undervoltage Lockout
Built鈭捍n Output Overvoltage Protection
Power Saving Shutdown Mode
Space Saving, Low Profile Micro8 Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
Typical Applications
PDAs
Digital Still Camera
Cellular Phone and Radios
Portable Test Equipment
Portable Scanners
Portable Audio Systems
1
Publication Order Number:
NCP1530/D
漏
Semiconductor Components Industries, LLC, 2004
November, 2004 鈭?Rev. 3
NCP1530DM27R2相關(guān)型號PDF文件下載
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描述
廠商
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