NCP1571 Datasheet, PDF (1/16 Pages) ON Semiconductor – Low Voltage Synchronous Buck Controller

NCP1571
Low Voltage Synchronous
Buck Controller
The NCP1571 is a low voltage buck controller. It provides the
control for a DC−DC power solution producing an output voltage as
low as 0.980 V over a wide current range. The NCP1571−based
solution is powered from 12 V with the output derived from a 2−7 V
supply. It contains all required circuitry for a synchronous NFET buck
regulator using the V²t control method to achieve the fastest possible
transient response and best overall regulation. NCP1571 operates at a
fixed internal 200 kHz frequency and is packaged in an SOIC−8.
This device provides undervoltage lockout protection, Soft−Start,
Power Good with delay, and built−in adaptive non−overlap. During
undervoltage lockout, the NCP1571 controller allows the power
supply output to drift down, allowing the load time to shut off. This
operation distinguishes the NCP1571 from other parts in its family.
Features
• Pb−Free Package is Available
• 0.980 V ± 1.0% Reference Voltage
• V² Control Topology
• 200 ns Transient Response
• Programmable Soft−Start
• Power Good
• Programmable Power Good Delay
• 40 ns Gate Rise and Fall Times (3.3 nF Load)
• Adaptive FET Non−Overlap Time
• Fixed 200 kHz Oscillator Frequency
• Undervoltage Lockout Holds Both Gate Outputs Low
• On/Off Control Through Use of the COMP Pin
• Overvoltage Protection through Synchronous MOSFETs
• Synchronous N−Channel Buck Design
• Dual Supply, 12 V Control, 2−7 V Power Source
http://onsemi.com
MARKING
DIAGRAM
8
1
SOIC−8
D SUFFIX
CASE 751
8
1571
ALYW
1
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
PIN CONNECTIONS
1
V_CC
PWRGD
PGDELAY
COMP
8
GND
V_FB
GATE(L)
GATE(H)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP1571D
SOIC−8
98 Units/Rail
NCP1571DR2
SOIC−8 2500 Tape & Reel
NCP1571DR2G 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, 2004
1
October, 2004 − Rev. 4
Publication Order Number
NCP1571/D