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TDA8139
DOUBLE (5.1V AND ADJUSTABLE) VOLTAGE REGULATOR WITH RESET AND DISABLE FUNCTIONS
PRELIMINARY DATA
TDA8139/DDouble (5.1V and Adjustable) Voltage Regulator
with Reset and Disable Functions
FEA TURES Input Voltage Range: 7 V to 18V Output Currents up to 750 mA Fixed Precision Output 1 Voltage: 5.1 V ±2% Adjustable Output 2 Voltage: 2.8 to 16V Output 1 with Reset Function Output 2 with Disable Function by TTL Input Short-Circuit Protection at both Outputs Thermal Protection Low Dropout Voltage
DESCRIPTIONThe TDA8139 and the TDA8139D are monolithic
dual positive voltage regulators designed to provide
a fixed precision output voltage of 5.1 V and an
adjustable voltage between 2.8 and 16 V for
currents up to 750 mA.
An internal reset circuit generates a reset pulse
when the voltage of OUTPUT1 drops below the
regulated voltage value.
OUTPUT2 can be disabled via the TTL input.
Short-circuit and thermal protections are included in
all versions.
TDA8139/D
TABLE OF CONTENTS
Chapter 1 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Chapter 2 ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42.1 Absolute Maximum Ratings ................................................................................................4
2.2 Thermal Data ......................................................................................................................4
2.3 Electrical Characteristics ......................................................................................................4
Chapter 3 CIRCUIT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Chapter 4 APPLICATION DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Chapter 5 POWER DISSIPATION AND LAYOUT INDICATIONS . . . . . . . . . . . . . . . . . . . . . .9
Chapter 6 PACKAGE MECHANICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Chapter 7 REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
TDA8139/D GENERAL INFORMATION GENERAL INFORMATION
Figure 1: TDA8139 Block Diagram
Figure 2: TDA8139D Block Diagram
ELECTRICAL CHARACTERISTICS TDA8139/D ELECTRICAL CHARACTERISTICS
2.1 Absolute Maximum Ratings
2.2 Thermal Data
2.3 Electrical Characteristics AMB= 25° C, VIN1 = 7 V, VIN2 = 10 V, unless otherwise specified. Mounted on board. For more information, refer to Section5.
TDA8139/D ELECTRICAL CHARACTERISTICS The output short-circuit currents are tested one channel at time. During a short-circuit, a large consumption
of power occurs, but the thermal protection circuit prevents any excessive temperatures. A safe permanent
short-circuit protection is only guaranteed for input voltages up to 16V.
CIRCUIT DESCRIPTION TDA8139/D CIRCUIT DESCRIPTIONThe TDA8139 and the TDA8139D are dual-voltage regulators with Reset and Disable functions.
The two regulation parts are supplied from a single voltage reference circuit trimmed by zener
zapping during EWS testing. Since the supply voltage of this voltage reference is connected to pin
INPUT1 (VIN1 ), the second regulator will not work if pin INPUT1 is not supplied.
The adjustable voltage of pin OUTPUT2 (VO2 ) is defined by output bridge resistors (R1, R2): the
values of these resistors are calculated to obtain, with the targetted value for VO2 , the reference
voltage (V REF = 2.5 V) on the median point connected to pin PROGRAM.
The output stages have been realized using a Darlington configuration with a typical dropout
voltage of 1.2V.
The Disable circuit will switch off pin OUTPUT2 if a voltage less than 0.8 V is applied to pin
DISABLE.
The Reset circuit checks the voltage at pin OUTPUT1. If this voltage drops below VO1 - 0.25V
(4.85 V Typ.), the "a" comparator (Figure 3) rapidly discharges capacitor Ce and the reset output
immediately switches to low. When the voltage at pin OUTPUT1 exceeds VO1 - 0.2 V (4.9 V Typ.),
the external capacitor voltage (VCe ) increases linearly to the reference voltage (V REF = 2.5 V)
corresponding to a Reset Pulse Delay tRD as shown in Figure4.
Afterwards, the reset output returns to high. To avoid glitches in the reset output, the second
comparator "b" has a large hysteresis (1.9 V).
Figure 3: Reset DiagramRDe 2.5V×
10μA--------------------------=
TDA8139/D CIRCUIT DESCRIPTION
Figure 4: Internal Reset Voltages
