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Número de pieza | NCV8614BMNR2G | |
Descripción | Ultra-Low Iq Automotive System Power Supply IC Power Saving Triple-Output Linear Regulator | |
Fabricantes | ON Semiconductor | |
Logotipo | ||
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No Preview Available ! NCV8614B
Ultra-Low Iq Automotive
System Power Supply IC
Power Saving Triple-Output
Linear Regulator
The NCV8614B 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 NCV8614B is specifically designed to address automotive
radio systems and instrument cluster power supply requirements. The
NCV8614B can be used in combination with the 4−Output
Controller/Regulator IC, NCV885x, to form a complete automotive
radio or instrument cluster power solution. The NCV8614B is
intended to supply power to various “always on” loads such as the
CAN transceivers and microcontrollers (core, memory and IO). The
NCV8614B 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 (Brown−out) Indicators
• Thermal Warning Indicator with Thermal Shutdown
• Single Reset with Externally Adjustable Delay for the 3.3 V Rail
• Push−Pull 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 Pb−Free Device
Applications
• Automotive Radio
• Instrument Cluster
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MARKING
DIAGRAM
20
1
DFN20
MN SUFFIX
CASE 505AB
NCV8614B
AWLYYWWG
G
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
ASO_RAIL
VIN−B
VIN−H
VIN−A
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†
NCV8614BMNR2G DFN20 2500 / Tape & Reel
(Pb−Free)
†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, 2010
July, 2010 − Rev. 1
1
Publication Order Number:
NCV8614B/D
1 page NCV8614B
SUPPLY VOLTAGES AND SYSTEM SPECIFICATION ELECTRICAL CHARACTERISTICS (7 V < ASO_RAIL < 18 V, VIN−H
= VIN−B 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, VIN−A =
VIN_S3 = 0 V, VIN−B = 13.2 V
34 50
mA
Minimum Operating Voltage
(VIN−H, VIN−B)
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
VIN−A Quiescent Current
VIN−A to VIN−B Risetime
VIN−B to VIN−A Falltime
VIN−A Operating Threshold
TJ = 25°C, CASO_RAIL = 1 mF,
ISYS = 400 mA
TJ = 25 °C, CASO_RAIL = 1 mF,
ISYS = 400 mA
VIN−A Rising
24 mA
200 msec
100 msec
7.2 7.5 7.75
V
VIN−A Operating Hysteresis
VIN−A Falling
100 175 250
mV
Max VIN−B to VASO_RAIL Voltage Drop
Max VIN−H to VASO_RAIL Voltage Drop
RESET (RST Pin)
ISYS = 400 mA, VIN−B = 7 V
ISYS = 400 mA, VIN−H = 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
VOUT2 −
0.5
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
Schmitt Trigger Falling Threshold
0.8 1.0 1.2
V
IGNOUT Voltage Low
IGNOUT Leakage Current
VBATT MONITOR
IGNIN = 5 V, 10 kW Pullup to 5 V
TJ = 25°C, IGNOUT = 5 V
0.4
0.1 0.5
V
mA
VBATT_MON Quiescent Current
TJ = 25°C, VBATT_MON = 13.2 V
3 5 mA
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5
5 Page NCV8614B
therefore is not effected by the soft−start 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 soft−start function, LDO3
will not have an independent soft−start.
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 temperature−stable 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 temperature−stable 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 temperature−stable 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
temperatures (−25°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 NCV8614B 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 NCV8614B has good thermal conductivity through the
PCB, the junction temperature will be relatively low with
high power applications.
The maximum dissipation the NCV8614B 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 push−pull output
stage. The high signal is provided by VPP. VPP is tied
internally to LDO2. Under this setup, and any setup where
LDO’s 1−3 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 NCV8614B 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
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Número de pieza | Descripción | Fabricantes |
NCV8614BMNR2G | Ultra-Low Iq Automotive System Power Supply IC Power Saving Triple-Output Linear Regulator | ON Semiconductor |
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