NCV890204
2.0 A, 2 MHz Automotive
Buck Switching Regulator
with Programmable Spread
Spectrum and Adjustable
RSTB
The NCV890204 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 NCV890204 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.
The NCV890204 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
04
ALYWG
G
1
DFN12
CASE 506CE
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 on page 18 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
Adjustable Spread Spectrum
Reset with Adjustable Delay
Logic level Enable Input Can be Directly Tied to
Battery
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, 2015
1
August, 2017 − Rev. 4
Publication Order Number:
NCV890204/D
NCV890204
CDRV
NCV890204
VIN
1 VIN
CIN
2 DRV
RSTB
3
RSTB
DELAY 10
BST 11
SW 12
CBST
DBST
L1
DFW
VOUT
COUT
RFB1
CDELAY
4 GND
EN
5 EN
6 RDEPTH
RDEPTH
FB 9
COMP 8
RCOMP
RMOD 7
RMOD
CCOMP
RFB2
Figure 1. Typical Application
CDRV
VIN
CIN
3V
Reg
DRV
VOUT
RSTB
RSTB
2A
+
+
S
+
−
FB
TSD
VOLTAGES
MONITORS
Enable
EN
+
−
+
+
−
+
COMP
Oscillator
PWM
LOGIC
ON OFF
BST
DELAY
CBST
VIN
SW
DBST
L1
DFW
VOUT
COUT
CDELAY
GND
Reset
Delay
Soft−Start
RESET
RCOMP
CCOMP
RMOD
RMOD
RDEPTH
RDEPTH
Spread
Spectrum
Figure 2. NCV890204 Block Diagram
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2
NCV890204
MAXIMUM RATINGS
Rating
Min/Max Voltage VIN, BST
Max Voltage VIN to SW
Min/Max Voltage SW
Min Voltage SW − 20 ns
Min/Max Voltage BST to SW
Min/Max Voltage on EN
Min/Max Voltage COMP
Min/Max Voltage FB
Min/Max Voltage DRV, DELAY, RMOD, RDEPTH
Min/Max Voltage RSTB
Thermal Resistance, 4x4 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
35
−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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3
NCV890204
VIN
DRV
RESET
GND
EN
1
2
3
4
5
12 SW
11 BST
10 DELAY
9 FB
8 COMP
7 RMOD
(Top View)
RDEPTH 6
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 impedance 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.
Modulation depth adjustment for spread spectrum. Set with a resistor to GND.
Modulation frequency adjustment for spread spectrum. Set with a resistor to GND.
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
11
12
Exposed
Pad
GND
EN
RDEPTH
RMOD
COMP
FB
DELAY
BST
SW
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4
NCV890204
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
V
IN
rising
V
IN
falling
Frequency Foldback Hysteresis
RESET
Threshold (in percentage of targeted regula-
tion V
OUT
).
Filtering delay (high-to-low transitions)
Sink current
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
FB
= 0.63 V
V
FLDUP
V
FLDDN
V
FLDHY
18.4
18
0.2
0.3
20
19.8
0.4
V
V
K
RESD
K
RESU
t
RESD
I
RES
V
OUT
going down
V
OUT
going up
V
OUT
going down
V
RESET
= 0.4 V
90
92
1.5
1
92
94.5
2.0
94
97
3.0
%
ms
mA
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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