®
Advanced
SPX2967
400mA Low Dropout Voltage Regulator
FEATURES
■
Output voltage tolerance
≤
2%
■
400mA current capability
■
Low Dropout Voltage
■
Very low standby current consumption
■
Input voltage up to 40V
■
Overvoltage protection up to 60V (≤ 400ms)
■
Reset function down to 1V output voltage
■
ESD protection up to 2000V
■
Adjustable reset time
■
On/Off logic
■
■
■
■
Over temperature protection
Reverse polarity protection
Short-circuit protection
Wide temperature range
SPX2967
SPX2967
7 Pin TO-220
7 Pin TO-263
1 2 3 4 5 6 7
1 2 3 4
5 6 7
GND
E2
RO
I
E2
RO
GND
D
E6
Now Available in Lead Free Packaging
APPLICATIONS
■
Automotive
■
Industrial
■
Wireless Base Station
DESCRIPTION
Sipex’s SPX2967 is a 5 volt low dropout voltage regulator for automotive applications. It supplies
output current at 400mA. The IC has short-circuit protection and has an overtemperature
protection circuit. The part is available in 7 pin TO-220 and TO-263 packages.
TYPICAL APPLICATION CIRCUIT
Input
I
Q
Q
+
E2; eg from
terminal 15
Reset to
µC
470nF
Inhibit
SPX2967
RO
SO
100nF
22µF
RI
GND
Hold
From
µC
RS2
0.1µF
Date: 8/23/04
SPX2967 400mA Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
1
D
E2
Q
I
5V Ouptut
APPLICATIONS INFORMATION
The IC regulates an input voltage V
I
in the range of 5.5 V < V
I
<40 V to a nominal output voltage
of V
Q
= 5.0V. A reset signal is generated for an output voltage of V
Q
< V
RT
(typ. 4.5V). The reset
delay can be set with an external capacitor. The device has two logic inputs. A voltage of V
E2
>4.0V
given to the E2-pin (e.g. by ignition) turns the device on. Depending on the voltage on pin E6 the
IC may be hold in active-state even if V
E2
goes down to low level. This makes it simple to
implement a self-holding circuit without external components. When the device is turned off, the
output voltage drops to 0V and current consumption tends towards 0
µA.
DESIGN NOTES FOR EXTERNAL COMPONENTS
The input capacitor C
I
is necessary for compensation of line influences. The resonant circuit
consisting of lead inductance and input capacitance can be damped by a resistor of approxi-
mately 1Ω in series with C
I
. The output capacitor is necessary for the stability of the regulating
circuit. Stability is guaranteed at values of
≥
22µF and an ESR of less than 3Ω within the operating
temperature range.
CIRCUIT DESCRIPTION
The control amplifier compares a reference voltage, which is kept highly accurate by resistance
adjustment, to a voltage that is proportional to the output voltage and drives the base of the series
transistor via a buffer. Saturation control as a function of the load current prevents and over-
saturation of the power element.
The reset output RO is in high state if the voltage on the delay capacitor C
D
greater than or equal
to V
UD.
The delay capacitance C
D
is charged with the current I
D
for output voltages greater than
the reset threshold V
RT.
If the output voltage gets lower than V
RT
a fast discharge of the delay
capacitor C
D
sets in and as soon as V
CD
gets lower than V
LD
the reset output RO is set to low-level.
The reset delay can be set within wide range by dimensioning the capacitance of the external
capacitor.
PIN DESCRIPTION
PIN
NUMBER
1
2
3
4
5
6
7
PIN NAME
I
E2
RO
GND
D
E6
Q
DESCRIPTION
Input;
Block to GND directly at the IC with a ceramic capacitor.
Inhibit;
Device is turned on by High signal on this pin; internal pulldown
resistor of 100k
Ω
Reset Output;
The open-collector output is internally linked to Q via a 30k
Ω
resistor. Keep it open if not needed.
Ground;
connected to rear of chip
Reset Delay;
connect via capacitor to GND for setting delay
Hold;
see truth table for function; this input is connected to output voltage
via a pull up resistor of 50k
Ω
5V Output;
block to GND with 22µF capacitor, ESR < 3
Ω
Date: 8/23/04
SPX2967 400mA Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
2
TRUTH TABLE FOR TURN-ON/TURN -OFF LOGIC
Pin 2,
Inhibit
L
H
H
X
L
L
Pin 6,
Hold
X
X
L
L
L
H
V
Q
OFF
ON
ON
ON
ON
OFF
Comments
Initial state, Inhibit internally pulled up
Regulator switched on via Inhibit, by ignition for example
Hold clamped active to ground by controller while Inhibit is still
high.
Previous state remains, even ignition is shut off: self-holding state
Ignition shut off while regulator is in self-holding state
Regulator shut down by releasing of Hold while Inhibit remains
Low, final state. No active clamping required by external self-
holding circuit (µC) to keep regulator in off-state
Pin 2, Inhibit:
E2 Enable function, active High
Pin 6, Hold:
E6 Hold and release function, active Low
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the
specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
Limit Values
Parameter
Input
Voltage
Voltage
Current
Reset Output
Voltage
Current
Reset Delay
Voltage
Current
Output
Voltage
Current
Inhibit
Voltage
Current
Date: 8/23/04
Symbol
Unit
Notes
min.
max.
V
I
V
I
I
I
-42
-
-
42
60
-
V
V
-
-
T
≤
400ms
Internally Limited
V
RO
I
RO
-0.3
-
7
-
V`
-
-
Internally Limited
V
D
V
D
-0.3
-
42
-
V
-
-
-
V
Q
I
Q
-0.3
-
7
-
V
-
-
Internally Limited
V
E2
I
E2
-42
-5
42
5
V
mA
-
t
≤
400ms
© Copyright 2004 Sipex Corporation
SPX2967 400mA Low Dropout Voltage Regulator
3
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the
specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
Parameter
Hold
Voltage
Current
GND
Current
Temperatures
Junction Temperature
Storage Temperature
Operating Range
Input Voltage
Thermal Resistance
Junction Ambient
Junction-case
Junction-case
Junction Ambient
Junction-case
Junction-case
Symbol
Limit Values
Unit
Notes
V
E6
I
E6
-0.3
-
7
-
V
mA
-
Internally Limited
I
GND
-0.5
-
A
-
T
J
T
stg
-40
-50
150
150
ºC
ºC
-
-
V
I
5.5
40
V
-
R
thja
R
thjc
Z
thjc
R
thja
R
thjc
Z
thjc
-
-
-
-
-
-
65
6
2
70
6
2
K/W
K/W
K/W
K/W
K/W
K/W
7 Pin TO220 package
7 Pin TO220 package
7 Pin TO220 package
7 Pin TO263 package
7 Pin TO263 package
7 Pin TO263 package
Date: 8/23/04
SPX2967 400mA Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
4
ELECTRICAL CHARACTERISTICS
V
IN
= 13.5V; -40°C < T
J
< 125°C.
The
♦
denotes the specifications which apply over the full operating temperature range, unless
otherwise specified.
Parameter
Output Volatage
Output Volatage
Output Current Limiting
Current Consumption
I
q
= I
I
- I
Q
Current Consumption
I
q
= I
I
- I
Q
Current Consumption
I
q
= I
I
- I
Q
Current Consumption
I
q
= I
I
- I
Q
Current Consumption
I
q
= I
I
- I
Q
Drop Voltage
Load Regulation
Supply-voltage regulation
Supply-voltage rejection
Longterm stability
Sym
V
Q
V
Q
I
Q
I
q
I
q
I
q
I
q
I
q
V
DR
∆
V
Q
∆
V
Q
∆
V
Q
∆
V
Q
Min
4.9
4.9
500
-
-
Typ
5.0
5.0
-
-
1.0
Max
5.1
5.1
-
50
10
Units
V
V
mA
µA
µA
Conditions
5mA
≤
I
Q
≤
400mA
6V
≤
V
I
≤
26V
5mA
≤
I
Q
≤
150mA
6V
≤
V
I
≤
40V
Tj = 25° C
IC turned off
Tj = 25° C
IC turned off
I
Q
=5mA
IC turned on
I
Q
= 400mA
I
Q
= 400mA
V
r
= 5V
I
Q
= 400mA (note 1)
5mA
≤
I
Q
≤
400mA
V
I
= 6 to 36V
I
Q
= 5mA
f
r
= 100Hz
V
r
= 0.5V
1000 h
-
1.3
4
mA
-
-
-
-
-
-
-
-
-
0.3
-
15
54
0
60
80
0.6
50
25
-
-
mA
mA
V
mV
mV
dB
mV
Note 1:
Drop voltage = V
I
- V
Q
measured when the output voltage has dropped 100mV from the nominal value obtained at 13.5V input.
Date: 8/23/04
SPX2967 400mA Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
5
Analog electronics
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