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Número de pieza NCV890101
Descripción 2MHz Automotive Buck Switching Regulator
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NCV890101
1.2A, 2MHz Automotive
Buck Switching Regulator
The NCV890101 is a fixedfrequency, monolithic, Buck switching
regulator intended for Automotive, batteryconnected applications
that must operate with up to a 36V input supply. The regulator is
suitable for systems with low noise and small form factor
requirements often encountered in automotive driver information
systems. The NCV890101 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
NCV890101. The NCV890101 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 allceramic output filter
capacitor forming a spaceefficient switching regulator solution.
http://onsemi.com
MARKING DIAGRAM
DFN10
CASE 485C
V8901
01
ALYWG
G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbFree Device
(*Note: Microdot may be in either location)
Features
Internal NChannel Power Switch
Low VIN Operation Down to 4.5 V
High VIN Operation to 36 V
Withstands Load Dump to 40 V
2 MHz Freerunning Switching Frequency
Autosynchronizes with Other NCV890101 or to an
External Clock
Logic level Enable Input Can be Directly Tied to
Battery
1.4 A (min) CyclebyCycle 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 SoftStart
Thermal Shutdown (TSD)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
Low Shutdown Current
Wettable Flanks DFN
NCV Prefix for Automotive and Other Applications
Requiring Unique Site and Control Change
Requirements; AECQ100 Qualified and PPAP
Capable
These Devices are PbFree and are RoHS Compliant
Applications
Audio
Infotainment
Safety Vision Systems
Instrumentation
VIN
CIN
SYNC
OUT
EN
CDRV
NCV890101
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, 2013
February, 2013 Rev. 1
1
Publication Order Number:
NCV890101/D

1 page




NCV890101 pdf
NCV890101
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
5 mA
3 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
SOFTSTART (SS)
VENLO
VENHI
IEN
0.8 V
2V
8 30 mA
SoftStart 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
Minimum COMP voltage
OSCILLATOR
IFBBIAS
gm
gm(HV)
ROUT
ISOURCE
ISINK
VCMPMIN
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
VFB = 0.97 V
0.25 1 mA
mmho
0.6 1 1.5
0.3 0.5 0.75
1.4 MW
mA
75
40
mA
75
40
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
VFLDUP
VFLDDN
Frequency Foldback Hysteresis
VFLDHY
1. Not tested in production. Limits are guaranteed by design.
VFB = 0.63 V
18.4 20
18 19.8
0.2 0.3 0.4
V
V
http://onsemi.com
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NCV890101 arduino
NCV890101
GENERAL INFORMATION
INPUT VOLTAGE
An Undervoltage Lockout (UVLO) circuit monitors the
input, and inhibits switching and resets the Softstart circuit
if there is insufficient voltage for proper regulation. The
NCV890101 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 NCV890101 withstands input voltages up to 40 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
1
inductor current at which the power switch shuts off. The
Current Mode control method employed by the NCV890101
allows the use of a simple, Type II compensation to optimize
the dynamic response according to system requirements.
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 subharmonic 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
NCV890101 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 autorecovery burst mode that further reduces the
dissipated power.
4 18 20
36
VIN (V)
Figure 27. NCV890101 Switching Frequency
Reduction at High Input Voltage
CURRENT LIMITING
Due to the ripple on the inductor current, the average
output current of a buck converter is lower than the peak
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
NCV890101 can deliver to a load.
ENABLE
The NCV890101 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 softstart of the
switching regulator output.
SOFTSTART
Upon being enabled or released from a fault condition,
and after the DRV voltage is established, a softstart circuit
ramps the switching regulator error amplifier reference
voltage to the final value. During softstart, the average
switching frequency is lower than its normal mode value
(typically 2 MHz) until the output voltage approaches
regulation.
ERROR AMPLIFIER
The error amplifier is a transconductance type amplifier.
The output voltage of the error amplifier controls the peak
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. NCV890101 Load Current Capability
with 4.7 mH Inductor
http://onsemi.com
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