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NCV8512 데이터시트 PDF




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기능 LDO Linear Regulator
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NCV8512 데이터시트, 핀배열, 회로
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NCV8512
5.0 V Micropower 150 mA
LDO Linear Regulator with
DELAY, Adjustable RESET,
and Monitor FLAG
The NCV8512 is a 5.0 V precision micropower voltage regulator.
The output current capability is 150 mA.
The output voltage is accurate within ±2.0% with a maximum
dropout voltage of 0.6 V at 150 mA. Low quiescent current is a feature
drawing only 130 mA with a 100 mA load. This part is ideal for any and
all battery operated microprocessor equipment.
Microprocessor control logic includes an active RESET (with
DELAY), and a FLAG monitor which can be used to provide an early
warning signal to the microprocessor of a potential impending RESET
signal. The use of the FLAG monitor allows the microprocessor to
finish any signal processing before the RESET shuts the
microprocessor down.
The active RESET circuit operates correctly at an output voltage as
low as 1.0 V. The RESET function is activated during the power up
sequence or during normal operation if the output voltage drops
outside the regulation limits.
The reset threshold voltage can be decreased by the connection of an
external resistor divider to RADJ lead.
The regulator is protected against reverse battery, short circuit, and
thermal overload conditions. The device can withstand load dump
transients making it suitable for use in automotive environments. The
device has also been optimized for EMC conditions.
Features
5.0 V ± 2.0% Output
Low 130 mA Quiescent Current
Active RESET
Adjustable Reset
150 mA Output Current Capability
Fault Protection
+60 V Peak Transient Voltage
−15 V Reverse Voltage
Short Circuit
Thermal Overload
Early Warning through FLAG/MON Leads
Thermally Enhanced in SOW−16 Exposed Pad
NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
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16
1
SOIC 16 LEAD
WIDE BODY
EXPOSED PAD
PW SUFFIX
CASE 751AG
MARKING
DIAGRAM
16
NCV8512
AWLYYWWG
1
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Device
PIN CONNECTIONS*
1
NC
VOUT
NC
NC
NC
NC
VIN
MON
16
FLAG
RESET
NC
GND
NC
NC
DELAY
RADJ
*Pin connections for reference only.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
December, 2006 − Rev. 0
1
Publication Order Number:
NCV8512/D




NCV8512 pdf, 반도체, 판매, 대치품
NCV8512
PACKAGE PIN DESCRIPTION
Package Pin Number
SOW−16 Exposed Pad
1, 3−6, 11, 12, 14
Pin Symbol
NC
2 VOUT
7 VIN
8 MON
9 RADJ
10 DELAY
13 GND
15 RESET
16 FLAG
No connection.
Function
±2.0%, 150 mA output.
Input Voltage.
Monitor. Input for early warning comparator. If not needed connect to VOUT.
Reset Adjust. If not needed connect to ground.
Timing capacitor for RESET function.
Ground. All GND leads must be connected to Ground.
Active reset (accurate to VOUT 1.0 V).
Open collector output from early warning comparator.
TYPICAL PERFORMANCE CHARACTERISTICS
5.01
5.00
4.99
VOUT = 5.0 V
VIN = 14 V
IOUT = 5.0 mA
1.2
1.0
0.8
0.6
0.4
VIN = 12 V
+125°C
+25°C
−40°C
0.2
4.98
−40 −25 −10 5 20 35 50 65 80 95 110 125
Temperature (°C)
Figure 2. Output Voltage vs. Temperature
0
0 5 10 15 20 25
IOUT (mA)
Figure 3. Quiescent Current vs. Output Current
14
VIN = 12 V
12
10
+125°C
8
+25°C
6
−40°C
4
2
0
0 15 30 45 60 75 90 105 120 135 140
IOUT (mA)
Figure 4. Quiescent Current vs. Output Current
7
T = 25°C
6
5 IOUT = 100 mA
4
3
2 IOUT = 50 mA
1
IOUT = 10 mA
0
6 8 10 12 14 16 18 20 22 24 26
VIN (V)
Figure 5. Quiescent Current vs. Input Voltage
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NCV8512 전자부품, 판매, 대치품
NCV8512
CIRCUIT DESCRIPTION
VIN
VOUT
DELAY
RESET Threshold
1.8V VDT
0.45V VLD
RESET
Td
Td
Power on Input Under−voltage
Reset V Dip
Secondary Output
Spike Overload
Figure 11. Reset and Delay Circuit Wave Forms
REGULATOR CONTROL FUNCTIONS
The NCV8512 contains a microprocessor−compatible
control function RESET (Figure 11).
RESET Function
A RESET signal (low voltage) is generated as the IC
powers up. After VOUT increases above the RESET
threshold, the DELAY timer is started. When the DELAY
timer passes 1.8 V, the RESET signal goes high. A discharge
of the DELAY timer is started when VOUT drops and stays
below the RESET threshold. When the DELAY timer level
drops below 0.45 V, the RESET signal is brought low.
The RESET output is an open collector NPN transistor,
controlled by a low voltage detection circuit. The circuit is
functionally independent of the rest of the IC thereby
guaranteeing that the RESET signal is valid for VOUT as low
as 1.0 V.
Adjustable Reset Function
The reset threshold VRL can be decreased from a typical
value of 4.65 V to as low as 3.5 V by using an external
voltage divider connected from VOUT to the pin RADJ as
displayed in Figure 12. The resistor divider keeps the
voltage above the VRADJ.TH (typical 1.31 V) and overrides
the internal threshold detector. Adjust the voltage divider
according to the following relationship:
VTHRES + VRADJ.TH
RADJ1 ) RADJ2
RADJ2
(2)
Where;
VTHRES is the desired output threshold voltage that starts
the time delay for Power on Reset Delay.
VRADJ.TH is the default threshold voltage of 1.31 V typ.
RADJ1 is the resistor connected from the 5 V output to the
RADJ pin.
RADJ2 is the resistor connected from the RADJ pin to
ground.
If the reset adjust option is not needed, the RADJ pin
should be connected to GND causing the reset threshold to
go to its default value (4.65 V typical).
As an example, select resistors to give a threshold voltage
of 4.0 V. This will allow the delay timer to start when the
output crosses the 4.0 V level.
VTHRES = 4.0 V = 1.31 V x (RADJ1 + RADJ2) / RADJ2
Let RADJ2 be 100 kW for low current consumption.
RADJ1 = 2.05 x 100 k = 205 kW
With 5 V on the output, the voltage on the RADJ pin will
be 1.64 V.
RADJ1
RADJ2
RADJ
VOUT
NCV8512
RRST
to mP and
System
Power
COUT
Delay
RESET
CDELAY
6.4 V
to mP and
RESET
Port
Figure 12. Adjustable RESET
DELAY Function
The reset delay circuit provides a delay (programmable by
external capacitor) on the RESET output lead.
The DELAY lead provides source current (typically 9 mA)
to the external DELAY capacitor at the following times:
1. During Power Up (once the regulation threshold
has been exceeded).
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