NCV97311 Datasheet, PDF (1/25 Pages) ON Semiconductor – 3 Buck Regulators

NCV97311
Automotive Battery-
Connected Low-Iq Multi-
Output Power Management
Unit with 3 Buck Regulators
Description
The NCV97311 is a 3−output regulator consisting of a low−Iq
battery−connected 3 A, 2 MHz non−synchronous switcher and two
low−voltage 1.5 A, 2 MHz synchronous switchers; all using integrated
power transistors.
The high−voltage switcher is capable of converting a 4.1 V to 18 V
battery input to a 5 V or 3.3 V output at a constant 2 MHz switching
frequency, delivering up to 3 A. In overvoltage conditions up to 37 V,
the switching frequency folds back to 1 MHz; in load dump conditions
up to 45 V the regulator shuts down.
The output of the battery−connected buck regulator serves as the low
voltage input for the 2 downstream synchronous switchers. Each
downstream output is adjustable from 1.2 V to 3.3 V, with a 1.5 A
average current limit and a constant 2 MHz switching frequency. Each
switcher has an independent enable and reset pin, giving extra power
management flexibility.
For low−Iq operating mode, the low−voltage switchers are disabled
and the standby rail is supplied by a low−Iq LDO (up to 150 mA) with
a typical Iq of 30 mA. The LDO regulator is in parallel to the
high−voltage switcher, and is activated when the switcher is forced in
standby mode.
All 3 SMPS outputs use peak current mode control with internal
slope compensation, internally−set soft−start, battery undervoltage
lockout, battery overvoltage protection, cycle−by−cycle current
limiting, hiccup mode short−circuit protection and thermal shutdown.
An error flag is available for diagnostics.
www.onsemi.com
1 32
QFN32
MW SUFFIX
CASE 488AM
MARKING DIAGRAM
1
NCV97311
XX
AWLYYWWG
G
XX
= 33 or 50
A
= Assembly Location
WL = Wafer Lot
YY
= Year
WW = Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering, marking and shipping information on
page 24 of this data sheet.
Features
• 5.0 V and 3.3 V Versions Available
• Low Quiescent Current in Standby Mode
• Programmable Spread Spectrum for EMI Reduction
• 2 Microcontroller Enabled Low Voltage Synchronous
Buck Converters
• Large Conversion Ratio of 18 V to 3.3 V Battery
Connected Switcher
• Wide Input of 4.1 to 45 V with Undervoltage Lockout
(UVLO)
• Fixed Frequency Operation Adjustable from 2.0 to
2.6 MHz
• Internal 1.5 ms Soft−starts
• Cycle−by−cycle Current Limit Protections
• Hiccup Overcurrent Protections (OCP)
• Individual Reset Pins with Adjustable Delays
• QFN Package with Wettable Flanks (pin edge plating)
• NCV Prefix for Automotive and Other Applications
Requiring Unique Site and Control Change
Requirements; AEC−Q100 Qualified and PPAP
Capable
• These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
Typical Applications
• Infotainment, Body Electronics, Telematics, ECU
© Semiconductor Components Industries, LLC, 2015
1
September, 2015 − Rev. 2
Publication Order Number:
NCV97311/D