NCP1580 Datasheet, PDF (1/12 Pages) ON Semiconductor – Low Voltage Synchronous Buck Controller

NCP1580
Low Voltage Synchronous
Buck Controller
The NCP1580 is a voltage mode PWM controller designed to
operate from a 5.0 V or 12 V supply and produce an output voltage as
low as 0.8 V. This 8−pin device provides an optimal level of
integration to reduce size and cost of the power supply. The NCP1580
has a fixed 350 kHz oscillator and soft−start function. The NCP1580
provides a 1.5 A floating gate driver design to drive N−Channel
MOSFETs in a synchronous configuration. Adaptive non−overlap
circuitry reduces switching losses by preventing simultaneous
conduction of both outputs. Protection features include thermal
shutdown and undervoltage lockout (UVLO). The NCP1580 is
available in an 8−pin SOIC package.
Features
• Input Voltage Range from 4.5 V to 13.2 V
• 350 kHz Internal Oscillator
• Boost Pin Operates to 26.5 V
• Voltage Mode PWM Control
• 0.8 V $1.5% Internal Reference Voltage
• Adjustable Output Voltage
• Internal Soft−Start
• Internal 1.5 A Gate Drivers
• Adaptive Non−Overlap Circuit
• 90% Max Duty Cycle
• Input UVLO
• Overtemperature Protection
• Fully Specified over −40°C to 85°C
• Pb−Free Package is Available
Applications
• Graphics Cards
• Desktop Computers
• Servers/Networking
• DSP and FPGA Power Supply
• DC−DC Regulator Modules
V_IN
http://onsemi.com
8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAM
8
1580
ALYW
1
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
PIN CONNECTIONS
BST 1
TG 2
GND 3
BG 4
8 PHASE
7 COMP
6 FB
5 V_CC
(Top View)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP1580DR2
SOIC−8 2500/Tape & Reel
NCP1580DR2G 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.
V_OUT
V_CC
BST
TG
FB
SWN
COMP
BG _GND
Figure 1. Typical Application Diagram
© Semiconductor Components Industries, LLC, 2005
1
January, 2005 − Rev. 4
Publication Order Number:
NCP1580/D