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STV8130A
ADJUSTABLE AND +3.3 V DUAL VOLTAGE REGULATOR WITH DISABLE AND RESET FUNCTIONS
PRELIMINARY DATA
STV8130ADADJUSTABLE AND +3.3 V DUAL VOLT AGE REGULATOR
WITH DISABLE AND RESET FUNCTIONS
FEA TURES Input Voltage Range: 5 V to 18V Output Currents up to 750 mA Fixed Precision Output 1 Voltage: 3.3 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 STV8130A# and STV8130D# are monolithic
dual positive voltage regulators designed to provide
a fixed precision output voltage of 3.3 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 Output 1 drops below the
regulated voltage value.
Output 2 can be disabled via the TTL input.
Short-circuit and thermal protections are included.
STV8130AD
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 DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Chapter 5 POWER DISSIPATION AND LAYOUT INDICATIONS . . . . . . . . . . . . . . . . . . . . . .8
Chapter 6 PACKAGE MECHANICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Chapter 7 REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
STV8130AD GENERAL INFORMATION GENERAL INFORMATION
Figure 1: STV8130A# Block Diagram
Figure 2: STV8130D# Block Diagram
ELECTRICAL CHARACTERISTICS STV8130AD ELECTRICAL CHARACTERISTICS
2.1 Absolute Maximum Ratings
2.2 Thermal Data
2.3 Electrical CharacteristicsTAMB= 25° C, VIN1 = 7 V, VIN2 = 10 V, unless otherwise specified. Mounted on board. For more information, refer to Section5.
STV8130AD ELECTRICAL CHARACTERISTICS This reset signal is activated by a decrease of VOUT1 voltage which can be due to an overload of pin OUT1
or by a lack of Input Voltage (VIN1). 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 STV8130AD CIRCUIT DESCRIPTIONThe STV8130A# and STV8130D# 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 (V OUT2 ) is defined by output bridge resistors (R1, R2): the
values of these resistors are calculated to obtain, with the targetted value for V OUT2 , the reference
voltage (V REF = 2.44 V) on the median point connected to pin PROGRAM.
The output stages are designed 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 V OUT1 - 0.25V
(3.05 V Typ.), the "a" comparator (Figure 3) rapidly discharges the external capacitor (Ce) and the
reset output immediately switches to low. This drop can be caused by a parasitic loading condition
on pin OUTPUT1 or by a too low value of VIN (short powering off). When the voltage at pin
OUTPUT1 exceeds V OUT1 - 0.2 V (3.1 V Typ.), the VCe voltage increases linearly to the reference
voltage (V REF = 2.44 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 (1.84 V).
Figure 3: Reset Diagram
Figure 4: Internal Reset VoltagestRD Ce 2.44V×
10μA---------------- -------------=
