NCV97311MW50AGEVB
NCV97311A Evaluation
Board User'sꢀManual
Description
The NCV97311A 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 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.
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EVAL BOARD USER’S MANUAL
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 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.
Figure 1. Evaluation Board Photo
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
© Semiconductor Components Industries, LLC, 2019
1
Publication Order Number:
April, 2019 − Rev. 0
EVBUM2621/D