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PDF NCV890230 Data sheet ( Hoja de datos )
| Número de pieza | NCV890230 | |
| Descripción | 2MHz Automotive Buck Switching Regulator | |
| Fabricantes | ON Semiconductor | |
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NCV890230
2 A, 2 MHz Automotive
Buck Switching Regulator
The NCV890230 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
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requirements often encountered in automotive driver information
systems. The NCV890230 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,
MARKING
DIAGRAM
8
eliminating the need for costly filters and EMI countermeasures. The
V890230
NCV890230 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
8
1
SOIC−8 EP
CASE 751AC
ALYWX
G
1
inductor values and an all−ceramic output filter capacitor − forming a
space−efficient switching regulator solution.
A = Assembly Location
L = Wafer Lot
Y = Year
Features
• Internal N−Channel Power Switch
W = Work Week
G = Pb−Free Device
• Low VIN Operation Down to 4.5 V
• High VIN Operation to 36 V
• Withstands Load Dump to 45 V
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 17 of this data sheet.
• 2 MHz Free−running Switching Frequency
• 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
• These Devices are Pb−Free and are RoHS Compliant
• Thermal Shutdown (TSD)
Applications
• Low Shutdown Current
• Audio
• NCV Prefix for Automotive and Other Applications
• Infotainment
Requiring Unique Site and Control Change
• Safety − Vision Systems
Requirements; AEC−Q100 Qualified and PPAP
Capable
• Instrumentation
VIN
CIN
EN
CDRV
NCV890230
1 VIN
SW 8
2 DRV
BST 7
3 GND
FB 6
4 EN COMP 5
DBST
CBST
L1
DFW
RFB1
VOUT
COUT
RCOMP
CCOMP
RFB2
Figure 1. Typical Application
© Semiconductor Components Industries, LLC, 2014
October, 2014 − Rev. 2
1
Publication Order Number:
NCV890230/D
1 page  
NCV890230
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
SOFT−START (SS)
VENLO
VENHI
IEN
0.8 V
2V
8 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 mA
mmho
0.6 1 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
VIN OVERVOLTAGE SHUTDOWN MONITOR
VFLDUP
VFLDDN
VFLDHY
VFB = 0.63 V
18.4 20
18 19.8
0.2 0.3 0.4
V
V
Overvoltage Stop Threshold
Overvoltage Start Threshold
Overvoltage Hysteresis
SLOPE COMPENSATION
VOVSTP
VOVSTT
VOVHY
32.4 36
30 35.4
0.6 1.5 2.4
V
V
V
Ramp Slope (Note 1)
(With respect to switch current)
Sramp
Sramp(HV)
4.5 < VIN < 18 V
20 V < VIN < 28 V
0.7
0.25
1.3 A/ms
0.6
1. Not tested in production. Limits are guaranteed by design.
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5
5 Page 
NCV890230
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
NCV890230 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 NCV890230 automatically terminates switching if
input voltage exceeds VOVSTP (see Figure 25), 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 25).
Frequency reduction is automatically terminated when the
input voltage drops back below the VIN Frequency Foldback
threshold VFLDDN.
Fsw
(MHz)
2
1
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
NCV890230 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
current setpoint of the regulator. Figure 26 shows − for a
4.7 mH inductor − how the variation of inductor peak current
with input voltage affects the maximum DC current the
NCV890230 can deliver to a load.
4
18 20
30 36
45
VIN (V)
Figure 25. NCV890230 Switching Frequency
Reduction at High Input Voltage
ENABLE
The NCV890230 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.
2.3
2.2
2.1 (3.3 VOUT)
2.0 (5 VOUT)
1.9
1.8
1.7
1.6
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
Figure 26. NCV890230 Load Current Capability
with 4.7 mH Inductor
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11
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| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet NCV890230.PDF ] | |
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