®
Preliminary
SPX2967
400mA Low Dropout Voltage Regulator
FEATURES
■
Output voltage tolerance
≤
2%
SPX2967
■
400mA current capability
7 Pin TO-263
■
Low Dropout Voltage
1 2 3 4 5 6 7
■
Very low standby current consumption
■
Overvoltage protection up to 60V (≤ 400ms)
■
Reset function down to 1V output voltage
■
ESD protection up to 2000V
■
Adjustable reset time
Now Available in Lead Free Packaging
■
On/Off logic
■
Over temperature protection
APPLICATIONS
■
Reverse polarity protection
■
Short-circuit protection
■
Industrial
■
Wide temperature range
■
Wireless Base Station
■
Close functional compatibility to
TLE4267 in TO-220-7-X package
DESCRIPTION
GND
E2
RO
The Sipex SPX2967 is a 5 volt LDO regulator with output current up to 400mA. The IC has
short-circuit protection and has an overtemperature protection circuit, ideal for industrial or
wireless base station applications. The part is available in a 7 pin TO-263 package.
TYPICAL APPLICATION CIRCUIT
Input
1
7
D
E6
Q
I
I
Q
E6
6
5V
Output
HOLD
From
µC
22µF
Inhibit;
e.g. from
terminal 15
470nF
Reset
to
µC
2
E2
SPX2967
3
RO
GND
4
D
5
100nF
Date: 9/01/05
SPX2967 400mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
1
APPLICATIONS INFORMATION
The SPX2967 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 at pin E6 the
IC can be held in an active-state even if V
E2
goes to a low level. This makes it simple to
implement a self-holding circuit without ex-
ternal components. When the device is
turned off, the output voltage drops to ZeroV
and current consumption tends towards Zero
µA.
Design Notes for External Components
The input capacitor is necessary for com-
pensation of line influences. The resonant
circuit consisting of lead inductance and
input capacitance can be damped by a
resistor of approximately 1Ω in series with
the input capacitance . The output capacitor
is necessary for the stability of the regulat-
ing 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 highly
accurate reference voltage 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 an over-satura-
tion of the power element.
The reset output RO is held high if the
voltage on the delay capacitor C
D
is 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 goes lower than
V
RT
, the delay capacitor C
D
is quickly dis-
charged. As soon as V
CD
gets lower than V
LD,
the reset output RO is set to a low level. The
reset delay can be set within a wide range
by adjusting 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;
decouple 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 .
Reset Output;
the open-collector output is internally linked to Q via a 30k
resistor. Leave open if not needed.
Ground;
connected to rear of chip.
Reset Delay;
connect capacitor to GND to set delay.
Hold;
see truth table for function; this input is connected to output voltage via
a pull up resistor of 50k .
5V Output;
decouple to GND with 22µF capacitor, ESR < 3 .
Date: 9/01/05
SPX2967 400mA Low Dropout Voltage Regulator
© Copyright 2005 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
Symbol
Min.
Input
Voltage
Voltage
Current
Reset Output
Voltage
Current
Reset Delay
Voltage
Current
Output
Voltage
Current
Inhibit
Voltage
Current
Date: 9/01/05
Unit
Max .
Notes
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
I
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
SPX2967 400mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
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
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
-
-
70
6
K/W
K/W
7 Pin TO263 package
7 Pin TO263 package
Date: 9/01/05
SPX2967 400mA Low Dropout Voltage Regulator
© Copyright 2005 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 Voltage
Output Voltage
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
Dropout 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
-
1.3
4
mA
-
-
-
-
-
-
-
-
-
0.3
30
15
54
0
60
80
0.6
80
25
-
-
mA
mA
V
mV
mV
dB
mV
V
I
= 6 to 36V
I
Q
= 5mA
f
r
= 100Hz
V
r
= 0.5V
1000 h
Note 1:
Dropout voltage = V
I
- V
Q
measured when the output voltage has dropped 100mV from the nominal value obtained at 13.5V input.
Date: 9/01/05
SPX2967 400mA Low Dropout Voltage Regulator
© Copyright 2005 Sipex Corporation
5
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