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Número de pieza NCV890131
Descripción 2MHz Automotive Buck Switching Regulator
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NCV890131
1.2 A, 2 MHz Automotive
Buck Switching Regulator
The NCV890131 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 NCV890131 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. Two
pins are provided to synchronize switching to a clock, or to another
NCV890131. The NCV890131 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.
www.onsemi.com
MARKING DIAGRAM
DFN10
CASE 485C
V8901
31
ALYWG
G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Device
(Note: Microdot may be in either location)
Features
Internal N−Channel Power Switch
Low VIN Operation Down to 4.5 V
High VIN Operation to 36 V
Withstands Load Dump to 45 V
2 MHz Free−running Switching Frequency
Auto−synchronizes with Other NCV890131 or to an
External Clock
Logic level Enable Input Can be Directly Tied to
Battery
1.4 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)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
Low Shutdown Current
Wettable Flanks − DFN
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
Audio
Infotainment
Safety − Vision Systems
Instrumentation
VIN
CIN
SYNC
OUT
EN
CDRV
NCV890131
DBST
1 VIN
SW 10
2 DRV
BST 9
3 SYNCO SYNCI 8
CBST
SYNC IN
L1
DFW
RFB1
4 GND
FB 7
5 EN COMP 6
RCOMP
CCOMP
VOUT
COUT
RFB2
Figure 1. Typical Application
© Semiconductor Components Industries, LLC, 2015
February, 2015 − Rev. 3
1
Publication Order Number:
NCV890131/D

1 page




NCV890131 pdf
NCV890131
ELECTRICAL CHARACTERISTICS (VIN = 4.5 V to 28 V, VEN = 5 V, VBST = VSW + 3.0 V, CDRV = 0.1 mF, Min/Max values are valid
for the temperature range −40°C TJ 150°C unless noted otherwise, and are guaranteed by test, design or statistical correlation.)
Parameter
Symbol
Conditions
Min Typ Max Unit
QUIESCENT CURRENT
Quiescent Current, shutdown
Quiescent Current, enabled
UNDERVOLTAGE LOCKOUT − VIN (UVLO)
IqSD
IqEN
VIN = 13.2 V, VEN = 0 V, TJ = 25°C
VIN = 13.2 V
10 mA
3.0 mA
UVLO Start Threshold
UVLO Stop Threshold
UVLO Hysteresis
ENABLE (EN)
VUVLSTT
VIN rising
4.1
4.5 V
VUVLSTP
VIN falling
3.9
4.4 V
VUVLOHY
0.1 0.2 V
Logic Low
Logic High
Input Current
SOFT−START (SS)
VENLO
VENHI
IEN
0.8 V
2.0 V
8.0 30 mA
Soft−Start Completion Time
VOLTAGE REFERENCE
tSS
0.8 1.4 2.0 ms
FB Pin Voltage during regulation
ERROR AMPLIFIER
VFBR
COMP shorted to FB
0.786 0.8 0.814
V
FB Bias Current
Transconductance
Output Resistance
COMP Source Current Limit
COMP Sink Current Limit
IFBBIAS
gm
gm(HV)
ROUT
ISOURCE
ISINK
VFB = 0.8 V
VCOMP = 1.3 V
4.5 V < VIN < 18 V
20 V < VIN < 28 V
VFB = 0.63 V, VCOMP = 1.3 V
4.5 V < VIN < 18 V
20 V < VIN < 28 V
VFB = 0.97 V, VCOMP = 1.3 V
4.5 V < VIN < 18 V
20 V < VIN < 28 V
0.25 1.0 mA
mmho
0.6 1.0 1.5
0.3 0.5 0.75
1.4 MW
mA
75
40
mA
75
40
Minimum COMP voltage
OSCILLATOR
VCMPMIN
VFB = 0.97 V
0.2
0.7 V
Frequency
FSW
FSW(HV)
4.5 < VIN < 18 V
20 V < VIN < 28 V
1.8 2.0 2.2 MHz
0.9 1.0 1.1
VIN FREQUENCY FOLDBACK MONITOR
Frequency Foldback Threshold
VIN rising
VIN falling
Frequency Foldback Hysteresis
SYNCHRONIZATION
VFLDUP
VFLDDN
VFLDHY
VFB = 0.63 V
18.4 20
18 19.8
0.2 0.3 0.4
V
V
SYNCO Output Pulse Duty Ratio
D(SYNC)
CLOAD = 40 pF
40
60 %
SYNCO Output Pulse Falltime
tR(SYNC)
CLOAD = 40 pF, 90% to 10%
4 ns
SYNCO Output Pulse Risetime
tF(SYNC)
CLOAD = 40 pF, 10% to 90%
4 ns
SYNCI Input Resistance to ground
RH(SYNC)
VSYNCI = 5.0 V
50
200 kW
SYNCI Input High Threshold Voltage
VHSYNC
2.0 V
SYNCI Input Low Threshold Voltage
VLSYNC
0.8 V
SYNCI High Pulse Width
tHSYNCI
VSYNC > max VHSYNC
40
ns
1. Not tested in production. Limits are guaranteed by design.
www.onsemi.com
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NCV890131 arduino
NCV890131
GENERAL INFORMATION
INPUT VOLTAGE
An Undervoltage Lockout (UVLO) circuit monitors the
input, and inhibits switching and resets the Soft−start circuit
if there is insufficient voltage for proper regulation. The
NCV890131 can regulate a 3.3 V output with input voltages
above 4.5 V and a 5.0 V output with an input above 6.5 V.
The NCV890131 automatically terminates switching if
input voltage exceeds VOVSTP (see Figure 27), and
withstands input voltages up to 45 V.
To limit the power lost in generating the drive voltage for
the Power Switch, the switching frequency is reduced by a
factor of 2 when the input voltage exceeds the VIN
Frequency Foldback threshold VFLDUP (see Figure 27).
Frequency reduction is automatically terminated when the
input voltage drops back below the VIN Frequency Foldback
threshold VFLDDN.
Fsw
(MHz)
2
SLOPE COMPENSATION
A fixed slope compensation signal is generated internally
and added to the sensed current to avoid increased output
voltage ripple due to bifurcation of inductor ripple current
at duty cycles above 50%. The fixed amplitude of the slope
compensation signal requires the inductor to be greater than
a minimum value, depending on output voltage, in order to
avoid sub−harmonic oscillations. For 3.3 V and 5 V output
voltages, the recommended inductor value is 4.7 mH.
SHORT CIRCUIT FREQUENCY FOLDBACK
During severe output overloads or short circuits, the
NCV890131 automatically reduces its switching frequency.
This creates duty cycles small enough to limit the peak
current in the power components, while maintaining the
ability to automatically reestablish the output voltage if the
overload is removed. If the current is still too high after the
switching frequency folds back to 500 kHz, the regulator
enters an auto−recovery burst mode that further reduces the
dissipated power.
CURRENT LIMITING
Due to the ripple on the inductor current, the average
output current of a buck converter is lower than the peak
1 current setpoint of the regulator. Figure 28 shows − for a
4.7 mH inductor − how the variation of inductor peak current
with input voltage affects the maximum DC current the
NCV890131 can deliver to a load.
4
18 20
30 36
45
VIN (V)
Figure 27. NCV890131 Switching Frequency
Reduction at High Input Voltage
ENABLE
The NCV890131 is designed to accept either a logic level
signal or battery voltage as an Enable signal. EN low induces
a ’sleep mode’ which shuts off the regulator and minimizes
its supply current to a couple of mA typically (IqSD) by
disabling all functions. Upon enabling, voltage is
established at the DRV pin, followed by a soft−start of the
switching regulator output.
SOFT−START
Upon being enabled or released from a fault condition,
and after the DRV voltage is established, a soft−start circuit
ramps the switching regulator error amplifier reference
voltage to the final value. During soft−start, the average
switching frequency is lower than its normal mode value
(typically 2 MHz) until the output voltage approaches
regulation.
1.4
1.3
1.2 (3.3 VOUT)
1.1
(5 VOUT)
1.0
0.9
0.8
0.7
0.60 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
Figure 28. NCV890131 Load Current Capability
with 4.7 mH Inductor
www.onsemi.com
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