NCV8851 Datasheet, PDF (1/18 Pages) ON Semiconductor – Automotive Grade Synchronous Buck Controller

NCV8851
Automotive Grade
Synchronous Buck
Controller
The NCV8851 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 20 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, cycle−by−cycle
overcurrent protection and thermal shutdown.
Features
• Average Current Mode Control
• 0.8 V ±2% Reference Voltage
• Input Voltage Range of 4.5 V to 20 V
• 6.0 V Low−dropout Linear Regulator (LDO)
• Input UVLO (Undervoltage Lockout)
• Internal Soft−start
• 1.0 mA Maximum Quiescent Current in Sleep Mode
• Adaptive Non−overlap Circuitry
• 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)
• Cycle−by−Cycle Overcurrent Protection (OCP)
• Thermal Shutdown (TSD)
Applications
• Automotive Systems Requiring High Current
• Pre−regulated Supply for Low−voltage SMPSs and LDOs
http://onsemi.com
TSSOP−20
SUFFIX DB
CASE 948E
MARKING DIAGRAM
NCV
8851
ALYWG
G
NCV8851 = Specific Device Code
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
NCV8851DBG
Package
TSSOP−20
(Pb−Free)
Shipping^†
75 Units/Rail
NCV8851DBR2G TSSOP−20 2500/Tape & Reel
(Pb−Free)
†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
April, 2010 − Rev. 2
Publication Order Number:
NCV8851/D