NCV890203
2.0 A, 2 MHz Automotive
Buck Switching Regulator
with RSTB
The NCV890203 is a fixed−frequency, monolithic, Buck switching
regulator intended for Automotive, battery−connected applications
that must operate with up to a 36 V input supply. The regulator is
suitable for systems with low noise and small form factor
requirements often encountered in automotive driver information
systems. The NCV890203 is capable of converting the typical 4.5 V to
18 V automotive input voltage range to outputs as low as 3.3 V at
a constant switching frequency above the sensitive AM band,
eliminating the need for costly filters and EMI countermeasures.
A Reset pin signals when the output is in regulation, and a pin is
provided to adjust the delay before the RSTB signal goes high.
The NCV890203 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
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MARKING DIAGRAM
V8902
03
ALYWG
G
DFN10
CASE 485C
A
L
Y
W
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Device
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 17 of this data sheet.
•
•
•
•
•
•
•
•
•
•
•
Internal N−Channel Power Switch
Low V
IN
Operation Down to 4.5 V
High V
IN
Operation to 36 V
Withstands Load Dump to 40 V
2 MHz Free−running Switching Frequency
Logic level Enable Input Can be Directly Tied to
Battery
Reset with Adjustable Delay
2.2 A (min) Cycle−by−Cycle Peak Current Limit
Short Circuit Protection enhanced by Frequency
Foldback
±1.75%
Output Voltage Tolerance
Output Voltage Adjustable Down to 0.8 V
•
•
•
•
•
1.4 Millisecond Internal Soft−Start
Thermal Shutdown (TSD)
Low Shutdown Current
Wettable Flanks DFN (pin edge plating)
NCV Prefix for Automotive and Other Applications
Requiring Unique Site and Control Change
Requirements; AEC−Q100 Qualified and PPAP Capable
•
These Devices are Pb−Free and are RoHS Compliant
Applications
•
•
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Audio
Infotainment
Safety − Vision Systems
Instrumentation
©
Semiconductor Components Industries, LLC, 2014
1
November, 2014 − Rev. 0
Publication Order Number:
NCV890203/D
NCV890203
CDRV
NCV890203
VIN
1 VIN
CIN
2 DRV
RSTB
3 RSTB
4 GND
EN
5 EN
COMP 6
RCOMP
CCOMP
RFB2
DELAY 8
CDELAY
FB 7
BST 9
DELAY
SW 10
CBST
DFW
RFB1
L1
VOUT
COUT
DBST
Figure 1. Typical Application
CDRV
DBST
VIN
CIN
3V
Reg
DRV
VOUT
RSTB
RSTB
Oscillator
PWM
LOGIC
ON OFF
2A
+
+
S
+
−
FB
TSD
VOLTAGES
MONITORS
Enable
EN
+
−
+
CCOMP
+
−
+
COMP
RCOMP
BST
DELAY
CDELAY
CBST
VIN
SW
L1
DFW
VOUT
COUT
GND
Reset
Delay
Soft−Start
RESET
Figure 2. NCV890203 Block Diagram
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2
NCV890203
MAXIMUM RATINGS
Rating
Min/Max Voltage VIN, BST
Max Voltage VIN to SW
Min/Max Voltage SW
Min Voltage SW − 20ns
Min/Max Voltage BST to SW
Min/Max Voltage on EN
Min/Max Voltage COMP
Min/Max Voltage FB
Min/Max Voltage DRV, DELAY
Min/Max Voltage RSTB
Thermal Resistance, 3x3 DFN Junction−to−Ambient*
Storage Temperature Range
Operating Junction Temperature Range
ESD withstand Voltage
Human Body Model
Moisture Sensitivity
Peak Reflow Soldering Temperature
T
J
V
ESD
2.0
MSL
Level 1
260
°C
R
qJA
Symbol
Value
−0.3 to 40
40
−0.7 to 40
−3.0
−0.3 to 3.6
−0.3 to 40
−0.3 to 2
−0.3 to 18
−0.3 to 3.6
−0.3 to 6
50
−55 to +150
−40 to +150
Unit
V
V
V
V
V
V
V
V
V
V
°C/W
°C
°C
kV
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.
*Mounted on 1 sq. in. of a 4−layer PCB with 1 oz. copper thickness.
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NCV890203
VIN
DRV
RSTB
GND
EN
1
2
3
4
5
(Top View)
10
9
8
7
6
SW
BST
DELAY
FB
COMP
Figure 3. Pin Connections
PIN FUNCTION DESCRIPTIONS
Pin No.
1
2
3
Symbol
VIN
DRV
RSTB
Description
Input voltage from battery. Place an input filter capacitor in close proximity to this pin.
Output voltage to provide a regulated voltage to the Power Switch gate driver.
RSTB open drain output. Goes high impedence when the output is above 94% of its regulation level,
after the delay set by the DELAY pin times out. Goes low when the output is below 92 % of its
regulation level (sensed on the FB signal)
Battery return, and output voltage ground reference.
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.
Error Amplifier output, for tailoring transient response with external compensation components.
Feedback input pin to program output voltage, and detect pre−charged or shorted output conditions.
Delay adjust input. Connecting an external capacitor adjusts the delay for the RSTB function.
Bootstrap input provides drive voltage higher than VIN to the N−channel Power Switch for optimum
switch R
DS(on)
and highest efficiency.
Switching node of the Regulator. Connect the output inductor and cathode of the freewheeling diode
to this pin.
Connect to Pin 4 (electrical ground) and to a low thermal resistance path to the ambient temperature
environment.
4
5
6
7
8
9
10
Exposed
Pad
GND
EN
COMP
FB
DELAY
BST
SW
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NCV890203
ELECTRICAL CHARACTERISTICS
(V
IN
=
4.5 V to 28 V, V
EN
= 5 V, V
BST
= V
SW
+ 3.0 V, C
DRV
= 0.1
mF,
Min/Max values are valid for the temperature range
−40°C
≤
T
J
≤
150°C unless noted otherwise, and are guaranteed by test, design or statistical correlation.)
Parameter
QUIESCENT CURRENT
Quiescent Current, shutdown
Quiescent Current, enabled
UNDERVOLTAGE LOCKOUT − VIN (UVLO)
UVLO Start Threshold
UVLO Stop Threshold
UVLO Hysteresis
ENABLE (EN)
Logic Low (Voltage input needed to guarantee
logic low)
Logic High (Voltage input needed to
guarantee logic high)
Input Current
SOFT−START (SS)
Soft−Start Completion Time
VOLTAGE REFERENCE
FB Pin Voltage during regulation
ERROR AMPLIFIER
FB Bias Current
Transconductance
g
m
g
m(HV)
Output Resistance
COMP Source Current Limit
R
OUT
I
SOURCE
V
FB
= 0.63 V, V
COMP
= 1.3 V
4.5 V < V
IN
< 18 V
20 V < V
IN
< 28 V
V
FB
= 0.97 V, V
COMP
= 1.3 V
4.5 V < V
IN
< 18 V
20 V < V
IN
< 28 V
V
FB
= 0.97 V
0.05
I
FBBIAS
V
FB
= 0.8 V
V
COMP
= 1.3 V
4.5 V < V
IN
< 18 V
20 V < V
IN
< 28 V
0.25
0.6
0.3
1
0.5
1.4
75
40
mA
75
40
0.55
V
1
1.5
0.75
MW
mA
mA
mmho
V
FBR
COMP shorted to FB
0.786
0.8
0.814
V
t
SS
0.8
1.4
2.0
ms
V
ENLO
V
ENHI
I
EN
2
8
30
0.8
V
V
mA
V
UVLSTT
V
UVLSTP
V
UVLOHY
V
IN
rising
V
IN
falling
4.1
3.2
0.5
4.5
3.6
1.3
V
V
V
I
qSD
I
qEN
V
IN
=
13.2 V, V
EN
= 0 V, T
J
= 25°C
V
IN
=
13.2 V
5
3
mA
mA
Symbol
Conditions
Min
Typ
Max
Unit
COMP Sink Current Limit
I
SINK
Minimum COMP voltage
OSCILLATOR
Frequency
VIN FREQUENCY FOLDBACK MONITOR
Frequency Foldback Threshold
Frequency Foldback Hysteresis
SLOPE COMPENSATION
Ramp Slope (Note 1)
(With respect to switch current)
V
IN
rising
V
IN
falling
V
CMPMIN
F
SW
F
SW(HV)
4.5 < V
IN
< 18 V
20 V < V
IN
< 28 V
1.8
0.9
2.0
1.0
2.2
1.1
MHz
V
FLDUP
V
FLDDN
V
FLDHY
V
FB
= 0.63 V
18.4
18
0.2
0.3
20
19.8
0.4
V
V
S
ramp
S
ramp(HV)
4.5 < V
IN
< 18 V
20 V < V
IN
< 28 V
1.70
0.80
3.20
1.60
A/ms
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
1. Not tested in production. Limits are guaranteed by design.
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