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PDF NCV890104 Data sheet ( Hoja de datos )
| Número de pieza | NCV890104 | |
| Descripción | 2MHz Automotive Buck Switching Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCV890104
1.2 A, 2 MHz Automotive
Buck Switching Regulator
with Programmable Spread
Spectrum and Adjustable
RSTB
www.onsemi.com
The NCV890104 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 NCV890104 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 NCV890104 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.
MARKING DIAGRAM
1
DFN12
CASE 506CE
V8901
04
ALYWG
G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = 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 18 of this data sheet.
Features
• Internal N−Channel Power Switch
• Low VIN Operation Down to 4.5 V
• High VIN 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
• 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)
• Low Shutdown Current
• NCV Prefix for Automotive and Other Applications
Requiring Unique Site and Control Change
Requirements; AEC−Q100 Qualified and PPAP
Capable
• Wettable Flanks DFN (pin edge plating)
• These Devices are Pb−Free and RoHS Compliant
Applications
• Audio
• Infotainment
• Safety − Vision Systems
• Instrumentation
© Semiconductor Components Industries, LLC, 2014
November, 2014 − Rev. 2
1
Publication Order Number:
NCV890104/D
1 page  
NCV890104
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
3.2
3.6 V
VUVLOHY
0.5 1.3 V
Logic Low (Voltage input needed to guarantee VENLO
logic low)
0.8 V
Logic High (Voltage input needed to
guarantee logic high)
VENHI
2V
Input Current
SOFT−START (SS)
IEN
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
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
0.05 0.55 V
Frequency
VIN FREQUENCY FOLDBACK MONITOR
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
Frequency Foldback Threshold
VIN rising
VIN falling
Frequency Foldback Hysteresis
RESET
VFLDUP
VFLDDN
VFLDHY
VFB = 0.63 V
18.4 20
18 19.8
0.2 0.3 0.4
V
V
Threshold (in percentage of targeted regula-
tion VOUT).
KRESD
KRESU
VOUT going down
VOUT going up
90 92 94
92 94.5 97
%
Filtering delay (high-to-low transitions)
tRESD
VOUT going down
1.5 2.0 3.0 ms
Sink current
IRES
VRESET = 0.4 V
1
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.
www.onsemi.com
5
5 Page 
NCV890104
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 NCV890104 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 NCV890104 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 25).
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 NCV890104 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 26 shows − for
a 4.7 mH inductor − how the variation of inductor peak
current with input voltage affects the maximum DC current
the NCV890104 can deliver to a load.
4 18 20
36
VIN (V)
Figure 25. NCV890104 Switching Frequency
Reduction at High Input Voltage
ENABLE
The NCV890104 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
0.6 0
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
Figure 26. NCV890104 Load Current Capability
with 4.7 mH Inductor
OUTPUT VOLTAGE SELECTION
The voltage output for the switcher is adjustable and can
be set with a resistor divider. The FB reference for the
switcher is 0.8 V.
www.onsemi.com
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet NCV890104.PDF ] | |
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