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TDA8137
DUAL 5.1V REGULATOR WITH DISABLE AND RESET
TDA8137DUAL 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
DESCRIPTIONThe 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.
PIN CONNECTION (top view)1/5
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
ELECTRICAL CHARACTERISTICS (VIN = 7V ; Tj = 25o C unless otherwise specified)
TDA81372/5
ELECTRICAL CHARACTERISTICS (VIN = 7V ; Tj = 25o C unless otherwise specified) (continued)
Figure 1
Figure 2
TDA81373/5
TYPICAL APPLICATION
CIRCUIT DESCRIPTIONThe 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 (VIN1), 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 VOUT - 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 VOUT -0.2V (4.9V Typ.), the voltage VCe
increases linearly to 2.5V corresponding to a delay
td following the low : td = Ce ⋅ 2.5V
10μA (see figure 2),
then the reset output goes high again. T o avoid
glitches in the reset output, the second comparator
"b" has a large hysteresis (1.9V).
TDA81374/5
PACKAGE MECHANICAL DATA9 PINS - PLASTIC HEPTAWATT
. 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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TDA81375/5
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