NCV8881PWR2G Datasheet, PDF (1/33 Pages) ON Semiconductor – 1.5A Automotive Buck Regulator with Watchdog

NCV8881
1.5A Automotive Buck
Regulator with Watchdog
The NCV8881 consists of a Buck switching regulator (SMPS) with
a combination SMPS output undervoltage monitor and CPU watchdog
circuit. In addition, two fixed−voltage low dropout regulator outputs
are provided, and share an LDO output voltage status output. Once
enabled, regulator operation continues until the Watchdog signal is no
longer present. The NCV8881 is intended for Automotive,
battery−connected applications that must withstand a 40 V load dump.
The switching regulator is capable of converting the typical 9 V to
19 V automotive input voltage range to outputs from 3.3 V to 8 V at a
constant switching frequency, which can be resistor programmed or
synchronized to an external clock signal. Enable input threshold and
hysteresis are programmable, with the enable input state replicated at
an open drain Ignition Buffer output. The regulators are protected by
current limiting, input overvoltage and overtemperature shutdown, as
well as SMPS short circuit shutdown.
Features
• 1.5 A Switching Regulator (internal power switch)
• 100 mA, 5 V LDO Output
• 40 mA, 8.5 V LDO Output
• Operating Range 5 V to 19 V
• Programmable SMPS Frequency
• SMPS can be Synchronized to an External Clock
• Programmable SMPS Output Voltage Down to 0.8 V
• $2% Reference Voltage Tolerance
• Internal SMPS Soft−Start
• Voltage−mode SMPS Control
• SMPS Cycle−by−Cycle Current Limit and Short−Circuit Protection
• Internal Bootstrap Diode
• Logic level Enable Input
• Enable Input Hysteresis Programmable by External Resistor Divider
• Enable Input State is Replicated at an Open Drain Output
• CPU Watchdog with Resistor Programmable Delays
• Watchdog Reset Output also Indicates SMPS Output Out of Regulation
• Battery Input Withstands Load Dump to 40 V
• Low Standby Current
• Thermal Shutdown (TSD)
• NCV Prefix for Automotive and Other Applications Requiring Site
and Change Controls
• These are Pb−Free Devices
http://onsemi.com
MARKING
DIAGRAMS
16
16
1
SO−16W EP
PW SUFFIX
CASE 751AG
NCV8881
AWLYYWWG
1
A
= Assembly Location
WL
= Wafer Lot
YY
= Year
WW = Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
1
IGNBUF
WDI
RDLY
RESB
EN
SYNC
ROSC
GND
16
5P0
LDOMON
8P5
VIN
SW
BST
FB
COMP
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 32 of this data sheet.
Applications
• Audio
• Infotainment
• Safety – Vision Systems
• Instrumentation
© Semiconductor Components Industries, LLC, 2011
1
January, 2011 − Rev. 1
Publication Order Number:
NCV8881/D