NCV891334 Datasheet, PDF (1/11 Pages) ON Semiconductor – 2 MHz Low-IQ Dual-Mode Step-Down Regulator

NCV891234, NCV891334
2 MHz Low-I_Q Dual-Mode
Step-Down Regulator for
Automotive
The NCV891x34 is a Dual Mode regulator intended for Automotive,
battery−connected applications that must operate with up to a 45 V
input supply. Hybrid Low Power Mode allows the NCV891x34 to
operate either as a PWM Buck Converter or as a Low Drop−Out Linear
Regulator, and the NCV891x34 is suitable for systems with Low Noise
and Low Quiescent Current requirements often encountered in
automotive driver information systems. A reset (with fixed delay) and
a fault pin (flagging low input voltage and high temperature warnings)
simplify interfacing with a microcontroller.
Two pins are provided to synchronize switching to a clock, or to
another NCV891x34. The NCV891x34 also provides several protection
features expected in automotive power supply systems such as current
limit, short circuit protection, and thermal shutdown. In addition, the
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 regulator solution.
Features
• 40 mA Iq in Light Load Condition
• 2.0 A Maximum Output Current in PWM Mode in NCV891234
• 3.0 A Maximum Output Current in PWM Mode in NCV891334
• Internal N−channel Power Switch
• V_IN Operating Range 3.7 V to 36 V, Withstands Load Dump to 45 V
• Logic Level Enable Pin can be Tied to Battery
• Fixed Output Voltage of 5.0 V or 3.3 V with ±2% Accuracy
• 2 MHz Free−running Switching Frequency
• Input and Output Synchronization Pins
• NCV Prefix for Automotive Requiring Site and Control Changes
• Wettable Flanks DFN (pin edge plating)
• These Devices are Pb−Free and are RoHS Compliant
Typical Applications
• Safety−Vision Systems
• Audio, Infotainment
• Instrumentation
• Telematics
CDRV
DBST
VIN
CIN
NCV891x34
VIN
SW
VIN2
BST
CBST
L1
DFW
VOUT
COUT
SYNCO
RESET
DRV
SYNCO
RSTB
VOUT
EN
SYNCI
ENABLE
SYNCI
GND
FLTB
FAULT
Figure 1. Application Schematic
www.onsemi.com
1
DFN12
MW SUFFIX
CASE 506CE
MARKING DIAGRAM
891x34
XX
ALYWG
G
891x34XX = Specific Device Code
x
= 2, 3
XX
= 33, 50
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Device
(Note: Microdot may be in either location)
PIN CONNECTIONS
VIN
VIN2
DRV
SYNCO
RSTB
GND
1
(Top View)
SW
BST
VOUT
EN
SYNCI
FLTB
ORDERING INFORMATION
See detailed ordering and shipping information on page 10 of
this data sheet.
© Semiconductor Components Industries, LLC, 2016
1
June, 2016 − Rev. 0
Publication Order Number:
NCV891334/D