TDA8137
DUAL 5.1V REGULATOR WITH DISABLE AND RESET
September 1993
.
OUTPUT CURRENTS UP TO 1A
.
FIXED PRECISION OUTPUT VOLTAGES
5.1V
2%
.
OUTPUT 1 WITH RESET FACILITY
.
OUTPUT 2 WITH DISABLE BY TTL INPUT
.
SHORT CIRCUIT PROTECTION AT BOTH
OUTPUTS
.
THERMAL PROTECTION
.
LOW DROP OUTPUT VOLTAGE
DESCRIPTION
The TDA8137 is a monolithic dual positive voltage
regulator designed to provide fixed precision output
voltages of 5.1V at currents up to 1A.
An internal reset circuit generates a reset pulse
when the output 1 decreases below the regulated
voltage value.
Output 2 can be disabled by TTL input.
Short circuit and thermal protections are included.
HEPTAWATT
(Plastic Package)
ORDER CODE : TDA8137
7
6
5
4
3
2
1
Tab connected to Pin 4
OUTPUT 1
OUTPUT 2
GROUND
DISABLE
RESET
INPUT
DELAY CAP
8
1
3
7
-0
1
.
EPS
PIN CONNECTION (top view)
1/5
4
3
1
2
6
OUT 1
RESET
OUT 2
DISABLE
DELAY
CAPACITOR
REFERENCE
PROTECTION
DISABLE
OUT 1
OUT 2
RESET
IN
7
5
C
R
TDA8137
81
37
-
0
2
.
E
P
S
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
IN
DC Input Voltage Pin 1
20
V
V
DIS
Disable Input Voltage Pin 3
20
V
V
RST
Output Voltage at Pin 5
20
V
I
01, 2
Output Currents
Internally Limited
P
t
Power Dissipation
Internally Limited
T
STG
Storage Temperature
65 to + 150
C
T
j
Junction Temperature
0 to + 150
C
81
37
-
0
4
.
T
B
L
THERMAL DATA
Symbol
Parameter
Value
Unit
R
TH(j-c)
Thermal Resistance Junction-case
Max.
3
C/W
T
j
Recommended Junction Temperature
Max.
0 to + 150
C
81
37
-
0
2
.
T
B
L
ELECTRICAL CHARACTERISTICS (V
IN
= 7V ; T
j
= 25
o
C unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
01, 2
Output Voltage
I
01, 2
= 10mA
5
5.1
5.2
V
7V < V
IN
< 14V, 5mA < I
0
< 750mA
4.9
5.3
V
V
I 01, 2
Dropout Voltage
I
01, 2
= 750mA
1.4
V
I
01, 2
= 1A
2
V
V
01, 2LI
Line Regulation
7V < V
IN
< 14V, I
01, 2
= 200mA
50
mV
V
01, 2LO
Load Regulation
5mA < I
01, 2
< 0.6A
100
mV
I
Q
Quiescent Current
I
01
= 10mA, Output 2 Disabled
2
mA
V
01RST
Reset Threshold Voltage
(K = V
01
)
K0.4
K.25
K0.1
V
V
RTH
Reset Threshold Hysteresis
(see circuit description)
20
50
75
mV
t
RD
Reset Pulse Delay at Pin 5
C
e
= 100nF (see circuit description)
25
ms
V
RL
Saturation Volt. at Pin 5 in
Reset Condition
I
5
= 5mA
0.4
V
81
37
-
0
3
.
T
B
L
TDA8137
2/5
ELECTRICAL CHARACTERISTICS (V
IN
= 7V ; T
j
= 25
o
C unless otherwise specified) (continued)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
RH
Leakage Current at Pin 5 in Normal Condition
V
5
= 10V
10
A
K
01,2
Output Volt. Thermal Drift
K
0
=
V
o
10
6
T
V
O
T
j
= 0 to + 125
C
100
ppm/
C
I
01,2SC
Short Circ. Output Current
V
IN
= 7V
1.6
A
V
IN
= 16V, (see note 1)
1
A
V
DISH
Disable Volt. at Pin 3 High (out 2 active)
2
V
V
DISL
Disable Volt. at Pin 3 Low (out 2 disabled)
0.8
V
I
DIS
Disable Bias Current at Pin 3
0V < V
DIS
< 7V
-100
2
A
T
jsd
Junction Temp. for Thermal Shut Down
145
C
Note 1 :
The output short circuit currents are tested one channel at time.
During a short circuit a large consumption of power occurs, anyway the thermal protection circuit guarantees the temperature not over-
comes high value.
Safe permanent short-circuit is only guaranteed for input voltages up to 16V.
8
137
-
0
4.
T
B
L
OUT 1
REG
REF
2.5V
-
+
50
a
+
-
Ce
2.5V 0.6V
b
RESET
10
A
7
2
5
8
1
3
7
-0
3
.
EPS
Figure 1
T
D
RESET
VOUT LOW
5.1V
4.9V
4.85V
T
D
81
37-
04
.
E
P
S
Figure 2
TDA8137
3/5
4
2
1
RESET
V
O1
V
IN1
V
O2
C1
C3
DISABLE
TDA8137
5
3
6
7
C1 C3 = 10
F
.
.
Ce
C2
8
1
3
7
-0
5
.
EPS
TYPICAL APPLICATION
CIRCUIT DESCRIPTION
The TDA8137 is a dual voltage regulator with Reset
and Disable.
The two regulation parts are supplied from one
voltage reference circuit trimmed by zener zap
during EWS test. Since the supply voltage of this
last is connected at Pin 1 (V
IN1
), the regulator 2 will
not work if the Pin 1 is not supplied.
The outputs stages have been realized in dar-
lington configuration with a drop typical of 1.2V.
The disable circuit, switches off the output 2 if a
voltage lower than 0.8V is applied at pin 3.
The Reset circuit checks the voltage at the output
1. If this one goes below V
OUT
- 0.25V (4.85V Typ.),
the comparator "a" (see Figure 1) discharges rap-
idly the capacitor Ce and the reset output goes at
once low. When the voltage at the OUT 1 rises
above V
OUT
-0.2V (4.9V Typ.), the voltage V
Ce
increases linearly to 2.5V corresponding to a delay
t
d
following the low : t
d
=
Ce
2.5
V
10
A
(see figure 2),
then the reset output goes high again. To avoid
glitches in the reset output, the second comparator
"b" has a large hysteresis (1.9V).
TDA8137
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L2
L3
L5
L7
L6
Dia.
A
C
D
E
D1
H3
H2
F
G
G1
G2
L1
L
MM
1
F1
P
M
-
H
EPT
V.
E
P
S
PACKAGE MECHANICAL DATA
9 PINS - PLASTIC HEPTAWATT
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics - All Rights Reserved
Purchase of I
2
C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips
I
2
C Patent. Rights to use these components in a I
2
C system, is granted provided that the system conforms to
the I
2
C Standard Specifications as defined by Philips.
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Dimensions
Millimeters
Inches
Min.
Typ.
Max.
Min.
Typ.
Max.
A
4.8
0.189
C
1.37
0.054
D
2.4
2.8
0.094
0.110
D1
1.2
1.35
0.047
0.053
E
0.35
0.55
0.014
0.022
F
0.6
08
0.024
0.031
F1
0.9
0.035
G
2.41
2.54
2.67
0.095
0.100
0.105
G1
4.91
5.08
5.21
0.193
0.200
0.205
G2
7.49
7.62
7.8
0.295
0.300
0.307
H2
10.4
0.409
H3
10.05
10.4
0.396
0.409
L
16.97
0.668
L1
14.92
0.587
L2
21.54
0.848
L3
22.62
0.891
L5
2.6
3
0.102
0.118
L6
15.1
15.8
0.594
0.622
L7
6
6.6
0.236
0.260
M
2.8
0.110
M1
5.08
0.200
Dia.
3.65
3.85
0.144
0.152
H
EPT
V.
T
B
L
TDA8137
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