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
http://onsemi.com
2
regulator using the V t control method to achieve the fastest possible
MARKING
DIAGRAM
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.
8
SOIC−8
D SUFFIX
CASE 751
1571
ALYW
8
1
1
Features
A
L
Y
W
= Assembly Location
= Wafer Lot
= Year
• Pb−Free Package is Available
• 0.980 V ± 1.0% Reference Voltage
= Work Week
2
• V 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
PIN CONNECTIONS
1
8
V
CC
GND
PWRGD
PGDELAY
COMP
V
FB
GATE(L)
GATE(H)
• 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
ORDERING INFORMATION
†
Device
Package
SOIC−8
SOIC−8
Shipping
NCP1571D
98 Units/Rail
NCP1571DR2
NCP1571DR2G
2500 Tape & Reel
2500 Tape & Reel
SOIC−8
(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
Publication Order Number
October, 2004 − Rev. 4
NCP1571/D