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Número de pieza NCV8614
Descripción Ultra-Low Iq Automotive System Power Supply IC Power Saving Triple-Output Linear Regulator
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NCV8614
Ultra-Low Iq Automotive
System Power Supply IC
Power Saving Triple-Output
Linear Regulator
The NCV8614 is a multiple output linear regulator IC’s with an
Automatic Switchover (ASO) input voltage selector. The ASO circuit
selects between three different input voltage sources to reduce power
dissipation and to maintain the output voltage level across varying
battery line voltages associated with an automotive environment.
The NCV8614 is specifically designed to address automotive radio
systems and instrument cluster power supply requirements. The
NCV8614 can be used in combination with the 4Output
Controller/Regulator IC, NCV885x, to form a complete automotive
radio or instrument cluster power solution. The NCV8614 is intended
to supply power to various “always on” loads such as the CAN
transceivers and microcontrollers (core, memory and IO). The
NCV8614 has three output voltages, a reset / delay circuit, and a host
of control features suitable for the automotive radio and instrument
cluster systems.
Features
Operating Range 7.0 V to 18.0 V (45 V Load Dump Tolerant)
Output Voltage Tolerance, All Rails, $2%
< 50 mA Quiescent Current
Independent Input for LDO3 Linear Regulator
High Voltage Ignition Buffer
Automatic Switchover Input Voltage Selector
Independent Input Voltage Monitor with a High Input Voltage and
Low Input Voltage (Brownout) Indicators
Thermal Warning Indicator with Thermal Shutdown
Single Reset with Externally Adjustable Delay for the 3.3 V Rail
PushPull Outputs for Logic Level Control Signals
All Ceramic Solution for Reduced Leakage Current at the Output
NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
This is a PbFree Device
Applications
Automotive Radio
Instrument Cluster
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MARKING
DIAGRAM
20
1
DFN20
MN SUFFIX
CASE 505AB
NCV8614
AWLYYWWG
G
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = PbFree Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
ASO_RAIL
VINB
VINH
VINA
VBATT_MON
HV_DET
BO_DET
NC
GND
HOT_FLG
VIN_S3
VOUT3
VOUT2
VOUT1
VOUT3FB
RST
DLY
GND
IGNOUT
IGNIN
ORDERING INFORMATION
Device
Package
Shipping
NCV8614MNR2G DFN20 2500 / Tape & Reel
(PbFree)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2008
December, 2008 Rev. 0
1
Publication Order Number:
NCV8614/D

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NCV8614 pdf
NCV8614
SUPPLY VOLTAGES AND SYSTEM SPECIFICATION ELECTRICAL CHARACTERISTICS (7 V < ASO_RAIL < 18 V, VINH
= VINB w ASO_RAIL, VPP = 3.3 V, VIN_S3 tied to ASO_RAIL, VBATT_MON = 0 V, IGNIN = 0 V, ISYS = 3 mA (Note 6))
Minimum/Maximum values are valid for the temperature range 40°C v TJ v 150°C unless noted otherwise. Min/Max values are
guaranteed by test, design or statistical correlation.
Parameter
Symbol
Conditions
Min Typ Max Unit
SUPPLY RAILS
Quiescent Current (Notes 4 and 6)
iq TJ = 25°C, ISYS = 70 mA, VINA =
VIN_S3 = 0 V, VINB = 13.2 V
34 50
mA
Minimum Operating Voltage
(VINH, VINB)
4.5 V
THERMAL MONITORING
Thermal Warning (HOT_FLG)
Temperature
TWARN
140 150 160
°C
TWARN Hysteresis
Thermal Shutdown
Thermal Shutdown Hysteresis
Delta Junction Temperature
(TSD TWARN)
HOT_FLG Voltage Low
HOT_FLG Voltage High
TJ < TWARN, 10 kW Pullup to 3.3 V
TJ > TWARN, 10 kW Pulldown to GND
10 20
160 170 180
10 20
10 20 30
VOUT2
0.5
0.4
°C
°C
°C
°C
V
V
AUTO SWITCHOVER
VINA Quiescent Current
VINA to VINB Risetime
VINB to VINA Falltime
VINA Operating Threshold
TJ = 25°C, CASO_RAIL = 1 mF,
ISYS = 400 mA
TJ = 25 °C, CASO_RAIL = 1 mF,
ISYS = 400 mA
VINA Rising
24 mA
200 msec
100 msec
7.2 7.5 7.75
V
VINA Operating Hysteresis
VINA Falling
100 175 250
mV
Max VINB to VASO_RAIL Voltage Drop
Max VINH to VASO_RAIL Voltage Drop
RESET (RST Pin)
ISYS = 400 mA, VINB = 7 V
ISYS = 400 mA, VINH = 7.5 V
1.5 V
2.0 V
RESET Threshold
Hysteresis
Reset Voltage High
% of VOUT2
% of VOUT2
10 kW Pulldown to GND
90 93
VO0U.T52
96
2.5
%
%
V
Reset Voltage Low
DELAY (DLY Pin)
10 kW Pullup to 3.3 V
0.4 V
Charge Current
Delay Trip Point Voltage
2.4 5
2.0
7
mA
V
IGNITION BUFFER
Schmitt Trigger Rising Threshold
2.75 3.25 3.75
V
www.DaStacShhmeitet tT4rUig.gceormFalling Threshold
IGNOUT Voltage Low
IGNOUT Leakage Current
VBATT MONITOR
IGNIN = 5 V, 10 kW Pullup to 5 V
TJ = 25°C, IGNOUT = 5 V
0.8 1.0 1.2
0.4
0.1 0.5
V
V
mA
VBATT_MON Quiescent Current
TJ = 25°C, VBATT_MON = 13.2 V
3 5 mA
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NCV8614 arduino
NCV8614
therefore is not effected by the softstart function upon the
device’s return from an over voltage condition. Also, when
VIN_S3 is connected to an independent supply and the
supply is made available after the softstart function, LDO3
will not have an independent softstart.
LDO1 Regulator
The LDO1 error amplifier compares the reference voltage
to a sample of the output voltage (VOUT1) and drives the gate
of an internal PFET. The reference is a bandgap design to
give it a temperaturestable output.
LDO2 Regulator
The LDO2 error amplifier compares the reference voltage
to a sample of the output voltage (VOUT2) and drives the gate
of an internal PFET. The reference is a bandgap design to
give it a temperaturestable output.
LDO3 Regulator
The LDO3 error amplifier compares the reference voltage
to a sample of the output voltage (VOUT3) and drives the gate
of an internal PFET. The reference is a bandgap design to
give it a temperaturestable output
LDO3 is an adjustable voltage output. The adjustable
voltage option requires an external resistor divider feedback
network. LDO3 can be adjusted up to 10 V. The internal
reference voltage is 0.996 V. To determine the proper
feedback resistors, the following formula can be used:
VOUT3 = VOUT3FB [(R1+R2)/R2]
VOUT3
R1
VOUTA FB
R2
Figure 4. Feedback Network
Stability Considerations
The output or compensation capacitors, COUTX help
determine three main characteristics of a linear regulator:
startup delay, load transient response and loop stability. The
capacitor values and type should be based on cost,
availability, size and temperature constraints. Tantalum,
aluminum electrolytic, film, or ceramic capacitors are all
acceptable solutions, however, attention must be paid to
ESR constraints. The aluminum electrolytic capacitor is the
least expensive solution, but, if the circuit operates at low
www.DtaetmaSpheereatt4uUre.sco(m25°C to 40°C), both the value and ESR of
the capacitor will vary considerably. The capacitor
manufacturer’s data sheet usually provides this information.
The value for each output capacitor COUTX shown in
Figures 22 27 should work for most applications; however,
it is not necessarily the optimized solution. Stability is
guaranteed at the following values:
COUT1 w 47 mF, ESR v 10 W
COUT2 w 47 mF, ESR v 10 W
COUT3 w 47 mF, ESR v 10 W
Actual limits are shown in graphs in the Typical
Performance Characteristics section.
Thermal
As power in the NCV8614 increases, it might become
necessary to provide some thermal relief. The maximum
power dissipation supported by the device is dependent
upon board design and layout. Mounting pad configuration
on the PCB, the board material, and the ambient temperature
affect the rate of junction temperature rise for the part. When
the NCV8614 has good thermal conductivity through the
PCB, the junction temperature will be relatively low with
high power applications.
The maximum dissipation the NCV8614 can handle is
given by:
PD(max) = (TJ(max)TA)/RthJA
See Figure 20 for RthJA versus PCB Area.
RthJA could be further decreased by using Multilayer PCB
and/or if Air Flow is taken into account.
IGNOUT Circuitry
The IGNOUT pin is an open drain output Schmitt Trigger,
externally pulled up to 3.3 V via a 10 kW resistor. The
IGNOUT pin can be used to monitor the ignition signal of
the vehicle, and send a signal to mute an audio amplifier
during engine crank. The IGNIN pin is ESD protected, and
can handle peak transients up to 45 V. An external diode is
recommended to protect against negative voltage spikes.
The IGNOUT circuitry requires the device to be enabled
for proper operation.
VPP Function
The reset and warning circuits utilize a pushpull output
stage. The high signal is provided by VPP. VPP is tied
internally to LDO2. Under this setup, and any setup where
LDO’s 13 are tied to VPP, loss of the VPP signal can occur
if the pull up voltage is reduced due to over current, thermal
shutdown, or overvoltage conditions.
Reset Outputs
The Reset Output is used as the power on indicator to the
Microcontroller. The NCV8614 Reset circuitry monitors the
output on LDO2.
This signal indicates when the output voltage is suitable
for reliable operation. It pulls low when the output is not
considered to be suitable. The Reset circuitry utilizes a push
pull output stage, with VPP as the high signal. In the event
of the part shutting down via Battery voltage or Enable, the
Reset output will be pulled to ground.
The input and output conditions that control the Reset
Output and the relative timing are illustrated in Figure 5,
Reset Timing. Output voltage regulation must be maintained
for the delay time before the reset output signals a valid
condition. The delay for the reset output is defined as the
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