NCV8851B
Automotive Grade
Synchronous Buck
Controller
The NCV8851B is an adjustable output, synchronous buck
controller, which drives dual N−channel MOSFETs, ideal for high
power applications. Average current mode control is employed for
very fast transient response and tight regulation over wide input
voltage and output load ranges. The IC incorporates an internal fixed
6.0 V low−dropout linear regulator (LDO), which supplies charge to
the switch mode power supply’s (SMPS) bottom gate driver, limiting
the power lost to excess gate drive. The IC is designed for operation
over a wide input voltage range (4.5 V to 40 V) and is capable of 10 to
1 voltage conversion at 500 kHz.
http://onsemi.com
TSSOP−20
SUFFIX DB
CASE 948E
Additional controller features include undervoltage lockout,
internal soft start, low quiescent current sleep mode, programmable
frequency, SYNC function, average current limiting, cycle−by−cycle
overcurrent protection and thermal shutdown.
MARKING DIAGRAM
Features
NCV
8851B
ALYWG
G
• Average Current Mode Control
• 0.8 V 2% Reference Voltage
• Wide Input Voltage Range of 4.5 V to 40 V
• Operates through Load Dump Conditions
• 6.0 V Low−dropout Linear Regulator (LDO)
• Input UVLO (Undervoltage Lockout)
• Internal Soft−start
NCV8851B = Specific Device Code
A
L
Y
W
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
• 1.0 mA Maximum Quiescent Current in Sleep Mode
• Adaptive Non−overlap Circuitry
(Note: Microdot may be in either location)
• 150 ns Minimum High−side Gate Off−time
• Programmable Fixed Frequency – 170 kHz to 500 kHz
• External Clock Synchronization up to 600 kHz
• Average Current Limiting (ACL)
ORDERING INFORMATION
†
Device
Package
Shipping
NCV8851BDBR2G TSSOP−20 2500/Tape & Reel
(Pb−Free)
• Cycle−by−Cycle Overcurrent Protection (OCP)
• Thermal Shutdown (TSD)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
• This is a Pb−Free Device
Applications
• Automotive Systems Requiring High Current
• Pre−regulated Supply for Low−voltage SMPSs and LDOs
© Semiconductor Components Industries, LLC, 2010
1
Publication Order Number:
June, 2010 − Rev. 1
NCV8851B/D