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STV8164
+5 V, +5 V AND ADJUSTABLE TRIPLE-VOLTAGE REGULATOR WITH DISABLE AND RESET FUNCTIONS
STV8164+5 V , +5 V and Adjustable Triple-Voltage Regulator
with Disable and Reset Functions
FEA TURES Input Voltage range between 7V and 18V,
limited to V OUT + 6.5V Maximum Available Output Currents greater than
0.8A Fixed Precision Output 1 voltage of 5 V ± 2% (at mA) Fixed Precision Output 2 voltage of 5 V ± 2% (at mA) Programmable Output 3 voltage: 2.5 to 16 V ± 2% Output 1 with Reset facility Outputs 2 and 3 can be disabled by digital input Short Circuit Protection on each output Thermal Protection Low Dropout Voltages
DESCRIPTIONThe STV8164 is a monolithic triple positive voltage
regulator designed to provide two fixed precision
output voltages of 5 V and an adjustable voltage for
currents up to 0.6 A.
The adjustable value of the third output can be fixed
from 2.5 V to 16 V.
An internal reset circuit generates a reset pulse
when the voltage of Output 1 drops below the
regulated voltage value.
Outputs 2 and 3 can be disabled by a digital input.
Short-circuit and thermal protections are included in
all versions.
STV8164
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63.1 Currents versus Maximum Power Limitation ........................................................................6
Chapter 4 APPLICATION DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Chapter 5 PACKAGE MECHANICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Chapter 6 REVISION HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
STV8164 GENERAL INFORMATION GENERAL INFORMATION
Figure 1: STV8164 Block Diagram
ELECTRICAL CHARACTERISTICS STV8164 ELECTRICAL CHARACTERISTICS
2.1 Absolute Maximum Ratings
2.2 Thermal Data
2.3 Electrical CharacteristicsTAMB= 25° C, VIN1 = 7 V, VIN2 = 7 V and VIN3 = 10 V, unless otherwise specified. Depending on heat sink conditions.
STV8164 ELECTRICAL CHARACTERISTICS
CIRCUIT DESCRIPTION STV8164 CIRCUIT DESCRIPTIONThe STV8164 is a triple-voltage regulator with Reset and Disable functions.
The three 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 and third regulators will not work if pin INPUT1 is not supplied.
The output stages are designed using a Darlington configuration with a typical dropout voltage of
1.0V.
The adjustable voltage of pin OUTPUT3 is defined by output bridge resistors (R1 and R2). The
values of these resistors are calculated to obtain, with the targeted value for pin OUTPUT3, the
VPROG voltage (2.0 V) on the median point connected to pin PROGRAM.
IMPORTANT: In all applications, all three inputs must be polarized. If Outputs 2 or 3 are not used, the
corresponding inputs must be connected to Input 1.
The Disable circuit will switch off pins OUTPUT2 and OUTPUT3 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
(4.75 V Typ.), the "a" comparator (Figure 2) rapidly discharges the external capacitor (Ce) and the
reset output immediately switches to low. When the voltage at pin OUTPUT1 exceeds OUT1 -0.175 V (4.825 V Typ.), the VCe voltage increases linearly to the reference voltage (V REF =
2.5 V) corresponding to a Reset Pulse Delay (tRD ) as shown in Figure3.
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).
3.1 Currents versus Maximum Power LimitationThe currents provided by the three outputs can reach 1.6 A. However, the power dissipation in the
STV8164 must be established so as not to activate the automatic thermal shutdown (TJ =150° C).
It is recommended not to have all three currents at their maximum value simultaneously.
For example, if T AMB(MAX.) = 70° C, the maximum power dissipation in the STV8164 will be (with thJA = 12 °C/W):
This means that the following conditions apply to input voltages and currents: IN1 - 5 V) x IIO1 + (VIN2 - 5 V) x IIO2 + (VIN3 - V OUT3 ) x IIO3 < 5.8WRD 2.5V×
10μA--------------------------=
140°C70°– C
12°CW⁄---- ------------------------------- 5.8W=
