Low Quiescent Current
2 MHz Automotive
Synchronous Buck Controller
NCV891930
The NCV891930 is a 2 MHz fixed−frequency low quiescent current
buck controller with spread spectrum that operates up to 38 V
(typical). It may be synchronized to a clock or to separate
NCV891930. Peak current mode control is employed for fast transient
response and tight regulation over wide input voltage and output load
ranges. Feedback compensation is internal to the device, permitting
design simplification. The NCV891930 is capable of converting from
an automotive input voltage range of 3.5 V (4.5 V during startup) to
18 V at a constant base switching frequency above the sensitive AM
band, eliminating the need for costly filters and EMI countermeasures.
The switching frequency folds back to 1 MHz for input voltages
between 20 V up to 38 V (typical). Under load dump conditions up to
45 V the regulator shuts down. A high voltage bias regulator with
automatic switchover to an external 5 V bias supply is used for
improved efficiency. Several protection features such as UVLO,
current limit, short circuit protection, and thermal shutdown are
provided. High switching frequency produces low output voltage
ripple even when using small inductor values and an all−ceramic
output filter capacitor, forming a space−efficient switching solution.
(410 kHz version offered with NCV881930)
www.onsemi.com
24
1
QFNW24 4x4, 0.5P
CASE 484AE
Note: With wettable flanks – meets JEDEC MO220
MARKING DIAGRAM
24
1
ZZZZZ
30XX
ALYWG
G
= V8919, 8919A
= 00, 01
= Assembly Location
= Wafer Lot
= Year
ZZZZZ
XX
A
L
Y
W
G
Features
• 30 mA Operating Current at No Load
• 75 mV Current Limit Sensing
• Capable of 45 V Load Dump
• Board Selectable Fixed Output Voltages With Lockout
• 2 MHz Operating Frequency
• Adaptive Non−Overlap Circuitry
• Integrated Spread Spectrum
• Logic level Enable Input Can be Tied Directly to Battery
• Short Circuit Protection Pulse Skip
• Battery monitoring for UVLO and Overvoltage Protection
• Thermal Shutdown (TSD)
• Adjustable Soft−Start
• SYNCI, SYNCO, Enable, RSTB, ROSC
• QFN Package with Wettable Flanks (pin edge plating)
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
(Top View)
24
23
22
21
20
19
18
V_CS
CSP
CSN
VOUT
NC
1
2
3
4
5
6
VDRV
VIN
17
16
15
14
13
DBIAS
VSEL
V_SO
GND
• NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
• This Device is Pb−Free, Halogen Free/BFR Free and is RoHS
Compliant
EN
SYNCO
7
8
9
10
11
12
Typical Applications
• Radio and Infotainment
• Instrumentations & Clusters
• ADAS (safety applications)
• Telematics
ORDERING INFORMATION
See detailed ordering and shipping information on page 31 of
this data sheet.
© Semiconductor Components Industries, LLC, 2018
1
Publication Order Number:
May, 2020 − Rev. 4
NCV891930/D