©
Semiconductor Components Industries, LLC, 2014
October, 2014 − Rev. 1
1
Publication Order Number:
EVBUM2218/D
NCV97310MW50GEVB
NCV97310 Evaluation Board
User'sManual
Description
The NCV97310 is 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 36 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 synchronous switchers. Each
downstream output is adjustable from 1.2 V to 3.3 V, with
a 1.5 A current limit and a constant 2 MHz switching
frequency. Each switcher has independent enable and reset
pins, 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
m
A. 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.
Key Features
•
Low Quiescent Current in Standby Mode
•
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
•
These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
Typical Applications
•
Infotainment, Body Electronics, Telematics, ECU
Figure 1. Evaluation Board Photo
http://onsemi.com
EVAL BOARD USER’S MANUAL
