NCP1575 Datasheet, PDF (1/16 Pages) ON Semiconductor – Low Voltage Synchronous Buck Controller with Adjustable Switching Frequency

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 V²t
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
• V² 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
http://onsemi.com
8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAM
8
1575
ALYW
1
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
PIN CONNECTIONS
1
V_CC
R_OSC
NC
COMP
8
GND
V_FB
GATE(L)
GATE(H)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP1575D
NCP1575DG
SOIC−8
SOIC−8
(Pb−Free)
98 Units/Rail
98 Units/Rail
NCP1575DR2 SOIC−8
NCP1575DR2G SOIC−8
(Pb−Free)
2500 Tape & Reel
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.
© Semiconductor Components Industries, LLC, 2004
1
November, 2004 − Rev. 6
Publication Order Number
NCP1575/D