NCV891130
Step-Down Regulator Automotive, Low-Iq,
Dual-Mode
1.2 A, 2 MHz
www.onsemi.com
The NCV891130 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 NCV891130 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.
8
1
SOIC−8
EXPOSED PAD
CASE 751AC
MARKING DIAGRAM
8
891130XX
ALYW
G
Features
•
•
•
•
•
•
•
•
•
•
•
30 mA Iq in Light Load Condition
1.2 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, 4.0 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
Typical Applications
•
•
•
•
Audio
Infotainment
Instrumentation
Safety−Vision Systems
NCV891130
VIN
CIN
RESET
VIN
DRV
RSTB
GND
CDRV
SW
1
With XX = 33 for 3.3 V Output
= 40 for 4.0 V Output
= 50 for 5.0 V Output
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Device
PIN CONNECTIONS
VIN
1
8
SW
DRV
2
7
BST
RSTB
3
6
VOUT
GND
4
5
EN
(Top View)
DBST
L1
CBST
VOUT
DFW
BST
COUT
ORDERING INFORMATION
See detailed ordering and shipping information on page 13 of
this data sheet.
VOUT
EN
EN
Figure 1. Typical Application
© Semiconductor Components Industries, LLC, 2016
August, 2019 − Rev. 1
1
Publication Order Number:
NCV891130/D
NCV891130
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
1.2 A
detector
+
−
+
−
+
+S
TSD
COUT
BST
Low PWM
LOGIC
ON OFF
Oscillator
RSTB
DFW
CBST
DRV
VOUT
L1
+
Logic
NCV891130
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
NCV891130
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 VIN to EN
−1.5 to 45
V
Min/Max Voltage BST
−0.3 to 43
V
Min/Max Voltage BST to SW
−0.3 to 3.6
V
−0.3 to 6
V
Min/Max Voltage VOUT
−0.3 to 18
V
Min/Max Voltage DRV
−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
Min/Max Voltage on RSTB
Thermal Resistance, SOIC8−EP Junction–to–Ambient (Note 1)
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
UVLO Stop Threshold
VIN falling
UVLO Hysteresis
VUVLSTT
4.1
4.5
V
VUVLSTP
3.1
3.7
V
VUVLOHY
0.4
1.4
V
tSS
0.8
1.4
2.0
ms
4.9
3.92
3.234
5.0
4.0
3.3
5.1
4.08
3.366
SOFT−START (SS)
Soft−Start Completion Time
OUTPUT VOLTAGE
Output Voltage during regulation
100 mA < IOUT < 1.2 A
5.0 V option
4.0 V option
3.3 V option
VOUTreg
V
4. Refer to ABSOLUTE MAXIMUM RATINGS and APPLICATION INFORMATION for Safe Operating Area.
5. Performance guaranteed over the indicated operating temperature range by design and/or characterization tested at TJ = TA = 25°C. Low
duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.
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3
NCV891130
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
FSW
FSW(HV)
1.8
0.9
2.0
1.0
2.2
1.1
MHz
Frequency Foldback Threshold
VIN rising
VIN falling
VFLDUP
VFLDDN
18.4
18
Frequency Foldback Hysteresis
VFLDHY
0.2
INtoL
3
OSCILLATOR
Frequency
4.5 < VIN < 18 V
20 V
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