NCP1587_12 Datasheet, PDF (1/16 Pages) ON Semiconductor – Low Voltage Synchronous Buck Controller

NCP1587, NCP1587A
Low Voltage Synchronous
Buck Controller
The NCP1587 and NCP1587A are low cost PWM controllers
designed to operate from a 5 V or 12 V supply. These devices are
capable of producing an output voltage as low as 0.8 V. These 8−pin
devices provide an optimal level of integration to reduce size and cost
of the power supply. The NCP1587/A provide a 1 A gate driver design
and an internally set 275 kHz (NCP1587) and 200 kHz (NCP1587A)
oscillator. In addition to the 1 A gate drive capability, other efficiency
enhancing features of the gate driver include adaptive non−overlap
circuitry. The devices also incorporate an externally compensated
error amplifier and a capacitor programmable soft−start function.
Protection features include programmable short circuit protection and
under voltage lockout (UVLO). The NCP1587/A comes in an 8−pin
SOIC package.
Features
• Input Voltage Range from 4.5 to 13.2 V
• 275 kHz (NCP1587) and 200 kHz (NCP1587A) Internal Oscillator
• Boost Pin Operates to 30 V
• Voltage Mode PWM Control
• 0.8 V ±1.0 % Internal Reference Voltage
• Adjustable Output Voltage
• Capacitor Programmable Soft−Start
• Internal 1 A Gate Drivers
• 80% Max Duty Cycle
• Input Under Voltage Lockout
• Programmable Current Limit
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• Graphics Cards
• Desktop Computers
• Servers / Networking
• DSP & FPGA Power Supply
• DC−DC Regulator Modules
http://onsemi.com
MARKING DIAGRAM
8
1
8
SOIC−8
D SUFFIX
CASE 751
1587x
ALYW
G
1
1587x = Specific Device Code
(x = A for NCP1587A,
blank for NCP1587)
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Device
PIN CONNECTIONS
BST 1
TG 2
GND 3
BG 4
8 PHASE
7 COMP/DIS
6 FB
5 V_CC
(Top View)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP1587DR2G SOIC−8 2500/Tape & Reel
(Pb−Free)
NCP1587ADR2G SOIC−8 2500/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.
© Semiconductor Components Industries, LLC, 2012
1
May, 2012 − Rev. 5
Publication Order Number:
NCP1587/D