Semiconductor Components Industries, LLC, 2004
November, 2004 − Rev. 6
1 Publication Order Number
NCP1575/D
NCP1575
Low Voltage Synchronous
Buck Controller with
Adjustable Switching
Frequency
The NCP1575 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. It contains all required
circuitry for a synchronous NFET buck regulator using the V
2
control method to achieve the fastest possible transient response and
best overall regulation. The NCP1575 operates at a default switching
frequency of 200 kHz, but switching frequency is user−programmable
with an additional resistor between R
OSC
and ground. This device
provides undervoltage lockout protection, soft−start, and built−in
adaptive nonoverlap and is assembled in an SOIC−8 package.
The NCP1575−based solution requires a bias supply of 12 V, and it
can convert from a bulk power supply ranging from 2 V to 12 V.
Conversion from bulk supplies greater than 7 V is best accomplished
by using an external doubler circuit to raise the enhancement voltage
for the external NFET switches.
Features
• Pb−Free Packages are Available
• 0.980 V ±1.0% Reference Voltage
• V
2
Control Topology
• 200 ns Transient Response
• Programmable Soft−Start
• 40 ns Gate Rise and Fall Times (3.3 nF Load)
• Adaptive FET Nonoverlap Time
• Default 200 kHz Oscillator Frequency (No External
Resistor Required)
• User−Programmable Oscillator Frequency (One External
Resistor Required)
• Undervoltage Lockout
• On/Off Control Through Use of the COMP Pin
• Overvoltage Protection through Synchronous MOSFETs
• Synchronous N−Channel Buck Design
• “12 V Only” or Dual Supply Operation
Device Package Shipping
†
ORDERING INFORMATION
NCP1575D
SOIC−8
98 Units/Rail
NCP1575DR2 2500 Tape & Reel
SOIC−8
D SUFFIX
CASE 751
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
GATE(H)COMP
18
GATE(L)NC
V
FB
R
OSC
GNDV
CC
PIN CONNECTIONS
1
8
http://onsemi.com
1575
ALYW
1
8
MARKING
DIAGRAM
NCP1575DG
SOIC−8
(Pb−Free)
98 Units/Rail
SOIC−8
SOIC−8
(Pb−Free)
NCP1575DR2G 2500 Tape & Reel
†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.
