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NCV8851B Datasheet, PDF (1/18 Pages) ON Semiconductor – Automotive Grade Synchronous Buck Controller | |||
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NCV8851B
Automotive Grade
Synchronous Buck
Controller
The NCV8851B is an adjustable output, synchronous buck
controller, which drives dual Nâchannel 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 lowâdropout linear regulator (LDO), which supplies charge to
the switch mode power supplyâs (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.
Additional controller features include undervoltage lockout,
internal soft start, low quiescent current sleep mode, programmable
frequency, SYNC function, average current limiting, cycleâbyâcycle
overcurrent protection and thermal shutdown.
Features
⢠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 Lowâdropout Linear Regulator (LDO)
⢠Input UVLO (Undervoltage Lockout)
⢠Internal Softâstart
⢠1.0 mA Maximum Quiescent Current in Sleep Mode
⢠Adaptive Nonâoverlap Circuitry
⢠150 ns Minimum Highâside Gate Offâtime
⢠Programmable Fixed Frequency â 170 kHz to 500 kHz
⢠External Clock Synchronization up to 600 kHz
⢠Average Current Limiting (ACL)
⢠CycleâbyâCycle Overcurrent Protection (OCP)
⢠Thermal Shutdown (TSD)
⢠This is a PbâFree Device
Applications
⢠Automotive Systems Requiring High Current
⢠Preâregulated Supply for Lowâvoltage SMPSs and LDOs
http://onsemi.com
TSSOPâ20
SUFFIX DB
CASE 948E
MARKING DIAGRAM
NCV
8851B
ALYWG
G
NCV8851B = Specific Device Code
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= PbâFree Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
Package
Shippingâ
NCV8851BDBR2G TSSOPâ20 2500/Tape & Reel
(PbâFree)
â 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.
© Semiconductor Components Industries, LLC, 2010
1
June, 2010 â Rev. 1
Publication Order Number:
NCV8851B/D
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