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NCP1530/D

更新时间： 2024-09-19 23:53:23
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600 mA PWM/PFM Step-Down Converter with External Synchronization Pin

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NCP1530/D 数据手册

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NCP1530  
600 mA PWM/PFM  
Step−Down Converter with  
External Synchronization Pin  
The NCP1530 is a PWM/PFM non−synchronous step−down  
(Buck) DC/DC converter for usage in systems supplied from 1−cell  
Li−ion, 2 and more cells Alkaline/NiCd/NiMH batteries. It can  
operate in Constant−Frequency 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.  
http://onsemi.com  
MARKING  
DIAGRAM  
Micro8]  
DM SUFFIX  
CASE 846A  
xxxx  
ALYW  
8
1
The NCP1530 consumes only 47 mA (typ.) of supply current  
(V  
= 3.0 V, no switching) and can be forced to shutdown mode by  
OUT  
xxxx = Specific Device Code  
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−in undervoltage lockout, internal  
thermal shutdown, an externally programmable soft−start 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 package.  
A
L
Y
W
= Assembly Location  
= Wafer Lot  
= Year  
= Work Week  
PIN CONNECTIONS  
V
1
2
8
7
6
5
LX  
V
IN  
Features  
SYN  
REF  
• High Conversion Efficiency, up to 92% at V = 4.3 V,  
IN  
SS  
V
OUT  
3
4
V
OUT  
= 3.3 V, I  
= 300 mA  
OUT  
GND  
EN  
• Current−Mode PWM Control  
• Automatic PWM/PFM Mode for Current Saving at Low Output Loads  
• Internal Switching Transistor Support 600 mA Output Current  
(Top View)  
(V = 5.0 V, V  
= 3.3 V)  
OUT  
IN  
• 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−Start Time through External Chip Capacitor  
• Externally Accessible Voltage Reference  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 14 of this data sheet.  
• Built−In Input Undervoltage Lockout  
• Built−In Output Overvoltage Protection  
• Power Saving Shutdown Mode  
• Space Saving, Low Profile Micro8 Package  
Typical Applications  
• PDAs  
• Digital Still Camera  
• Cellular Phone and Radios  
• Portable Test Equipment  
• Portable Scanners  
• Portable Audio Systems  
Semiconductor Components Industries, LLC, 2004  
1
Publication Order Number:  
March, 2004 − Rev. 1  
NCP1530/D  
1234567...16

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