DATA SHEET
www.onsemi.com
Step-Down Regulator Automotive, Low-Iq,
Dual-Mode
8
1
SOIC−8
EXPOSED PAD
CASE 751AC
NCV891330
3 A, 2 MHz
MARKING DIAGRAM
8
The NCV891330 is a Dual Mode regulator intended for Automotive,
battery−connected applications that must operate with up to a 45 V
input supply. Depending on the output load, it operates either as a PWM
Buck Converter or as a Low Drop−Out Linear Regulator, and is suitable
for systems with low noise and Low Quiescent Current requirements
often encountered in automotive driver information systems. A reset
pin (with fixed delay) simplifies interfacing with a microcontroller.
The NCV891330 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.
891330xG
ALYW
G
1
x
A
L
Y
W
G
PIN CONNECTIONS
Features
•
•
•
•
•
•
•
•
•
•
•
= 3 for 3.3 V Output
= 5 for 5.0 V Output
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Device
30 mA Iq in Light Load Condition
3.0 A Maximum Output Current in PWM Mode
Internal N−channel Power Switch
VIN 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
2 MHz Free−running Switching Frequency
±2 % Output Voltage Accuracy
NCV Prefix for Automotive Requiring Site and Control Changes
These Devices are Pb−Free and are RoHS Compliant
VIN
1
8
SW
DRV
2
7
BST
RSTB
3
6
VOUT
GND
4
5
EN
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information on page 15 of
this data sheet.
Typical Applications
•
•
•
•
Audio
Infotainment
Instrumentation
Safety−Vision Systems
NCV891330
VIN
CIN
RESET
CDRV
VIN
SW
DRV
BST
RSTB
GND
DBST
L1
CBST
DFW
VOUT
COUT
VOUT
EN
EN
Figure 1. Typical Application
© Semiconductor Components Industries, LLC, 2015
November, 2021 − Rev. 4
1
Publication Order Number:
NCV891330/D
NCV891330
CDRV
DBST
VIN
VIN
CIN
SW
3.3 V
Reg
VOUT
Enable
comp
Soft−Start
RESET
EN
EN
+
Switcher Supply
ON
MODE
SELECTION
LINEAR
REGULATOR
ON OVLD
GND
+
−
RESET
VOLTAGES
MONITORS
3A
detector
+
−
+
−
+
+S
TSD
COUT
BST
Low PWM
LOGIC
ON OFF
Oscillator
RSTB
DFW
CBST
DRV
VOUT
L1
+
Logic
NCV891330
Figure 2. Simplified Block Diagram
Table 1. PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
1
VIN
Input voltage from battery. Place an input filter capacitor in close proximity to this pin.
2
DRV
Output voltage to provide a regulated voltage to the Power Switch gate driver.
3
RSTB
Reset function. Open drain output, pulling down to ground when the output voltage is out of regulation.
4
GND
Battery return, and output voltage ground reference.
5
EN
This TTL compatible Enable input allows the direct connection of Battery as the enable signal. Grounding
this input stops switching and reduces quiescent current draw to a minimum.
6
VOUT
Output voltage feedback and LDO output. Feedback of output voltage used for regulation, as well as LDO
output in LDO mode.
7
BST
Bootstrap input provides drive voltage higher than VIN to the N−channel Power Switch for minimum
switch Rdson and highest efficiency.
8
SW
Switching node of the Regulator. Connect the output inductor and cathode of the freewheeling diode to
this pin.
EPAD
Description
Connect to Pin 4 (electrical ground) and to a low thermal resistance path to the ambient temperature
environment.
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2
NCV891330
Table 2. ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
Min/Max Voltage VIN
Value
Unit
−0.3 to 45
V
45
V
−0.7 to 40
V
Max Voltage VIN to SW
Min/Max Voltage SW
Min Voltage SW − 20 ns
−3.0
V
Min/Max Voltage EN
−0.3 to 40
V
Min/Max Voltage BST
−0.3 to 43
V
Min/Max Voltage BST to SW
−0.3 to 3.6
V
Min/Max Voltage on RSTB
−0.3 to 6
V
Min/Max Voltage VOUT
−0.3 to 18
V
Min/Max Voltage DRV
Thermal Resistance, SOIC8−EP Junction–to–Ambient (Note 1)
−0.3 to 3.6
V
30
°C/W
−55 to +150
°C
TJ
−40 to +150
°C
VESD
2.0
kV
MSL
Level 2
RθJA
Storage Temperature range
Operating Junction Temperature Range
ESD withstand Voltage (Note 2)
Human Body Model
Moisture Sensitivity
Peak Reflow Soldering Temperature (Note 3)
260
°C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. Value based on 4 layers of 645 mm2 (or 1 in2) of 1 oz copper thickness on FR4 PCB substrate.
2. This device series incorporates ESD protection and is tested by the following methods:
ESD Human Body Model tested per AEC−Q100−002 (EIA/JESD22−A114)
Latchup Current Maximum Rating: v150 mA per JEDEC standard: JESD78
3. For information, please refer to our Soldering and Mounting Techniques Reference Manual, SOLDERRM/D
Table 3. ELECTRICAL CHARACTERISTICS
VIN = 4.5 to 28 V, VEN = 5 V, VBST = VSW + 3 V, CDRV = 0.1 mF, for typical values TJ = 25°C, Min/Max values are valid for the temperature
range −40°C v TJ v 150°C unless noted otherwise, and are guaranteed by test, design or statistical correlation (Notes 4, 5)
Parameter
Test Conditions
Symbol
Min
Typ
Max
Unit
Iq
30
39
mA
IqSD
9
12
mA
QUIESCENT CURRENT
Quiescent Current, enabled
VIN = 13.2 V, IOUT = 100 mA, 25°C
Quiescent Current, shutdown
VIN = 13.2 V, VEN = 0 V, 25°C
UNDERVOLTAGE LOCKOUT – VIN (UVLO)
UVLO Start Threshold
VIN rising
VUVLSTT
4.1
4.5
V
UVLO Stop Threshold
VIN falling
VUVLSTP
3.1
3.7
V
VUVLOHY
0.4
1.4
V
tSS
0.8
1.4
2.0
ms
4.9
3.234
5.0
3.3
5.1
3.366
1.8
0.9
2.0
1.0
2.2
1.1
UVLO Hysteresis
SOFT−START (SS)
Soft−Start Completion Time
OUTPUT VOLTAGE
Output Voltage during regulation
100 mA < IOUT < 2.5 A
5.0 V option
3.3 V option
VOUTreg
4.5 < VIN < 18 V
20 V
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