NCP1501 Datasheet, PDF (1/14 Pages) ON Semiconductor – Dual Mode PWM/Linear Buck Converter

NCP1501
Dual Mode PWM/Linear
Buck Converter
The NCP1501 is a dual mode regulator that operates either as a
PWM Buck Converter or as a Low Drop Out Linear Regulator. If a
synchronization signal is present, the NCP1501 operates as a current
mode PWM converter with synchronous rectification. The
synchronization signal allows the user to control the location of the
spurious frequency noise generated by a PWM converter. Linear mode
is active when a synchronization signal is not present. The NCP1501
configuration allows an efficient high power operation and low noise
during system sleep modes.
Features
• Synchronous Rectification for Higher Efficiency in PWM Mode
• Linear Mode Operation for Low Noise Output at Low Loads
• Integrated MOSFETs and Feedback Circuits
• Cycle−by−Cycle Peak Current Limit of 800 mA (typ)
• Automatic Switching Between PWM and Linear Mode
• Operating Frequency Range of 500 to 1000 kHz
• Optimized for Ceramic Capacitors and Low Profile Inductors
• Thermal Limit Protection
• Built−in Slope Compensation for Current Mode PWM Converter
• Fixed Output Voltages of 1.05 V, 1.35 V, 1.57 V, 1.8 V
• Shutdown Current Consumption of 0.2 mA
• Internal Soft Start
• Transistor Count: 3500
• Pb−Free Package is Available
Typical Applications
• Cellular Phones
• PDAs
• Pagers
• Supplies for DSP Cores
• Portable Applications
V_out
10 m
L 10 mH
C_OUT
1 SHD CB0 8
2 SYN CB1 7
3 V_O
4 LX
GND 6
V_in 5
NCP1501
V_bat
10 m ^CIN
http://onsemi.com
MARKING
DIAGRAM
8
1
Micro8E
(MSOP−8)
DM SUFFIX
CASE 846A
8
1501
AYW
1
1501= Device Code
A = Assembly Location
Y = Year
W = Work Week
PIN CONNECTIONS
SHD 1
SYN 2
V_O 3
LX 4
(Top View)
8 CB0
7 CB1
6 GND
5 Vin
ORDERING INFORMATION
Device
Package
Shipping^†
NCP1501DMR2
Micro8 4000/Tape & Reel
NCP1501DMR2G Micro8 4000/Tape & Reel
(Pb−Free)
†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.
Figure 1. Typical Applications Circuit
© Semiconductor Components Industries, LLC, 2004
1
March, 2004 − Rev. 7
Publication Order Number:
NCP1501/D