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TDA8138-TDA8138A
5.1V+ 12V REGULATOR WITH DISABLE AND RESET
May 1993
5.1V +12V REGULATOR WITH DISABLE AND RESET
TDA8138 OUTPUT CURRENTS UP TO 1A. FIXED PRECISION OUTPUT 1 VOLTAGE
5.1V +/- 2%. FIXED PRECISION OUTPUT 2 VOLTAGE
12V +/- 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. AVAILABLE ALSO IN HEPTAWATT PACKAGE
IN TWO VERSIONS : TDA8138A (DISABLE
ONLY), TDA8138B (RESET ONLY)
DESCRIPTIONThe TDA8138 is a monolithic dual positive voltage
regulator designed to provide fixed precision output
voltages of 5.1V and 12V at currents up to 1A.
An internal reset circuit generates a reset pulse
when the output 1 decrease below the regulated
voltage value (for TDA8138 and TDA8138B).
Output 2 can be disabled by TTL input (for
TDA8138 and TDA8138A).
Short circuit and thermal protections are included
in all the versions.
PIN CONNECTIONS1/6
BLOCK DIAGRAM (SIP9 package)
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
TDA81382/6
ELECTRICAL CHRACTERISTICS (VIN1 = 7V, VIN2 = 14V, Tj = 25o C, unless otherwise specified)
Note : Safe permanent short-circuit is only guaranteed for input voltages up to 16V.The TDA8138 is a dual voltage regulator with Reset
and Disable (TD8138A : Disable only, TDA8138B :
Reset only).
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 (VIN1), the regulator 2 will not work if Pin 1 is
not supplied.
The outputs stage have been realized in darlington
configuration with a drop typical 1.2V.
The disable circuit, switch-off the output 2 if a
voltage lower than 0.8V is applied at Pin 3
(Heptawatt) or Pin 4 (SIP9)
The Reset circuit checks the voltage at the out-
put 1. If this one goes below VOUT - 0.25V (4.85V
typ.), the comparator "a" (see Figure 1) discharges
rapidly the capacitor Ce and the reset output goes
at once Low. When the voltage at the out1 rises
above VOUT - 0.2V (4.9V typ.), the voltage VCe
increases linearly to 2.5V corresponding to a delay
td following the law : t1 = Ce ⋅ 2.5V
10μA (see Figure 2),
then the reset output goes high again. To avoid
gliches in the reset output, the second comparator
"b" has a large hysteresis (1.9V).
CIRCUIT DESCRIPTION
TDA81383/6
Figure 1
Figure 2
TYPICAL APPLICATION (SIP9 package)
TDA81384/6
PACKAGE MECHANICAL DATA9 PINS - PLASTIC HEPTAWATT
TDA81385/6
PACKAGE MECHANICAL DATA9 PINS - PLASTIC SIP
. However, SGS-THOMSON Microelectronics assumes no responsibility
for the 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 I2
C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips2
C Patent. Rights to use these components in a I2
C system, is granted provided that the system conforms to
the I2
C Standard Specifications as defined by Philips.
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TDA81386/6
