NCP1511
Advance Information
PWM Buck Converter with a
Very Low Iq During Low
Load Conditions
The NCP1511 is a tri-mode regulator that operates either as a
Synchronized PWM Buck Converter, PWM Buck Converter with
internal oscillator or as a Pulsed Switching Regulator. If a
synchronization signal is present, the NCP1511 operates as a current
mode PWM converter with synchronous rectification. The optional
external frequency input signal allows the user to control the location
of the spurious frequency noise generated by a PWM converter. The
Pulsed Switching Regulator mode is active when the Sync Pin is
Low. The Pulsed Mode is an extremely low quiescent current Buck
Converter. NCP1511 operates in a PWM mode with an internal
oscillator when the Sync Pin is held high. The NCP1511
configuration allows the flexibility of efficient high power operation
and low input current during system sleep modes.
http://onsemi.com
MARKING
DIAGRAM
XXXX
9 PIN
YYWW
MICRO BUMP
FC SUFFIX
CASE 499E
1
XX = Device Code
YY = Year
WW = Work Week
Features
PIN CONNECTIONS
• Synchronous Rectification for Higher Efficiency in PWM Mode
• Pulsed Switching Mode Operation for Low Current Consumption at
Low Loads
Pin: A1. - GNDP
A2. - LX
A1
A2
A3
B1
B2
C1
C2
C3
• Integrated MOSFETs and Feedback Circuits
• Cycle-by-Cycle Current Limit
• Automatic Switching Between PWM, with External or Internal
Oscillator, and Pulsed Mode
• Operating Frequency Range of 450 to 1000 kHz
• Internal 1.0 MHz Oscillator
A3. - VCC
B1. - SYNC
B2. - GNDA
B3. - FB
C1. - SHD
C2. - CB1
C3. - CB0
B3
• Thermal Limit Protection
(Bottom View)
• Built-in Slope Compensation for Current Mode PWM Converter
• 1.0, 1.3, 1.5, 1.89 Fixed Output Voltages
• Shutdown Current Consumption of 0.2 mA
• Pb Free Package for Green Manufacturing
Applications
ORDERING INFORMATION
Device
Package
Shipping
TBD
NCP1511FCT1G 9 Pin Pb Free
Micro Bump
• Cellular Phones and Pagers
• PDA
• Digital Cameras
• Supplies for DSP Cores
• Portable Applications
This document contains information on a new product. Specifications and information
herein are subject to change without notice.
Semiconductor Components Industries, LLC, 2003
1
Publication Order Number:
June, 2003 - Rev. 2
NCP1511/D