ADJUSTABLE AND +3.3 V DUAL VOLTAGE REGULATOR WITH DISABLE AND RESET FUNCTIONS RESET DELAY CAPACITOR. September /12

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1 STV810AD ADJUSTABLE AND +. V DUAL VOLTAGE REGULATOR WITH DISABLE AND FUNCTIONS FEATURES Input Voltage Range: 5 V to 18 V Output Currents up to 750 ma Fixed Precision Output 1 Voltage:. V ±2% Adjustable Output 2 Voltage: 2.8 to 16 V Output 1 with Reset Function PRELIMINARY DATA Output 2 with Disable Function by TTL Input Short-circuit Protection at both Outputs Thermal Protection SIP9 (Plastic Package) ORDER CODE: STV810A# Low Dropout Voltage DESCRIPTION The STV810A# and STV810D# are monolithic dual positive voltage regulators designed to provide a fixed precision output voltage of. 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. DIP16 (8 + 8) ORDER CODE: STV810D# Output 2 can be disabled via the TTL input. Short-circuit and thermal protections are included. Tab is connected to INPUT1 OUTPUT2 INPUT2 PROGRAM DELAY CAPACITOR DISABLE DISABLE DELAY CAPACITOR PROGRAM INPUT2 OUTPUT2 INPUT September 200 1/12 This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

2 STV810AD TABLE OF CONTENTS Chapter 1 GENERAL INFORMATION Chapter 2 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings Thermal Data Electrical Characteristics...4 Chapter CIRCUIT DESCRIPTION Chapter 4 APPLICATION DIAGRAMS Chapter 5 POWER DISSIPATION AND LAYOUT INDICATIONS Chapter 6 PACKAGE MECHANICAL DATA Chapter 7 REVISION HISTORY /12

3 STV810AD 1 GENERAL INFORMATION GENERAL INFORMATION Figure 1: STV810A# Block Diagram DELAY CAPACITOR Reference 6 INPUT1 1 Regulator 1 9 Protection INPUT2 2 8 Regulator 2 OUTPUT2 DISABLE 4 7 PROGRAM 5 Figure 2: STV810D# Block Diagram DELAY CAPACITOR Reference 5 INPUT1 1 Regulator 1 8 Protection INPUT2 2 7 Regulator 2 OUTPUT2 DISABLE 4 6 PROGRAM Pins 9 to 16 /12

4 ELECTRICAL CHARACTERISTICS 2 ELECTRICAL CHARACTERISTICS STV810AD 2.1 Absolute Maximum Ratings Symbol Parameter Value Unit V IN DC Input Voltage at pins INPUT1 and INPUT2 20 V V DIS Disable Input Voltage at pin DISABLE 20 V V RST Output Voltage at pin 20 V I OUT1,2 Output Currents Internally Limited P t Power Dissipation Internally Limited T STG Storage Temperature -65 to +150 C T J Junction Temperature 0 to +150 C 2.2 Thermal Data Symbol Parameter Value Unit R thjc Thermal Resistance (Junction-to-Case) STV810A# STV810D# 9 15 C/W R thja Thermal Resistance 1 (Junction-to-Ambient) STV810A# STV810D# C/W T J Maximum Recommended Junction Temperature 140 C T OPER Operating Free Air Temperature Range 0 to +70 C 1. Mounted on board. For more information, refer to Section Electrical Characteristics T AMB = 25 C, V IN1 = 7 V, V IN2 = 10 V, unless otherwise specified. Symbol Parameter Test Conditions Min. Typ. Max. Unit V OUT1 Output Voltage I OUT1 = 10 ma V V OUT2 Output Voltage I OUT2 = 10 ma V V IO1,2 Dropout Voltage I OUT1,2 = 750 ma 1.4 V V O1,2LI Line Regulation 6V < V IN1 < 12 V 12 V < V IN2 < 18 V I OUT1,2 = 200 ma mv V O1,2LO Load Regulation 5mA < I OUT1 < 600 ma 5mA < I OUT2 < 600 ma mv 4/12

5 STV810AD ELECTRICAL CHARACTERISTICS Symbol Parameter Test Conditions Min. Typ. Max. Unit I Q Quiescent Current I OUT1 = 10 ma, OUTPUT2 Disabled 2 ma V O1RST Reset Threshold Voltage 1 K = V OUT1, I OUT1 50 ma K K K V V RTH Reset Threshold Hysteresis See circuit description mv t RD Reset Pulse Delay C e = 100 nf See circuit description. 25 ms V RL Saturation Voltage in Reset Condition I = 5 ma 0.4 V I RH Leakage Current in Normal Condition V = 10 V 10 µa K OUT1, 2 Output Voltage Thermal Drift V K 0 = T V ppm/ C T J = 0 to C I OUT1,2SC Short Circuit Output Current V IN1 = 7 V, V IN2 = 10 V 1.6 V IN1,2 = 16 V A V DISH Disable Voltage when pin DISABLE is High (OUTPUT2 active) 2 V V DISL Disable Voltage when pin DISABLE is Low (OUTPUT2 disabled) 0.8 V I DIS Disable Bias Current 0V < V DIS < 7 V µa V REF Reference Voltage at PROGRAM Pin 2.44 V T JSD Junction Temperature for Thermal Shutdown 145 C 1. This reset signal is activated by a decrease of V OUT1 voltage which can be due to an overload of pin OUT1 or by a lack of Input Voltage (V IN1 ). 2. 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 16 V. 5/12

6 CIRCUIT DESCRIPTION CIRCUIT DESCRIPTION STV810AD The STV810A# and STV810D# 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 (V IN1 ), 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 1.2 V. 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. If this voltage drops below V OUT V (.05 V Typ.), the "a" comparator (Figure ) 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 or by a too low value of V IN (short powering off). When the voltage at pin exceeds V OUT1-0.2 V (.1 V Typ.), the V Ce voltage increases linearly to the reference voltage (V REF = 2.44 V) corresponding to a Reset Pulse Delay (t RD ) as shown in Figure 4. C e 2.44V t RD = µA 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 : Reset Diagram 10 µa V REF = 2.44 V V REF + a - 50 REG - + Ce V REF 0.6V b Figure 4: Internal Reset Voltages V OUT1 K V O1RST V RTH K = Actual Value of V OUT1 Power On t RD t RD Power Off 6/12

7 STV810AD 4 APPLICATION DIAGRAMS APPLICATION DIAGRAMS Figure 5: STV810A# Typical Application Ce 0.1 µf R 1 + R 2 V O2 = V REF R 1 V IN1 V IN DELAY CAPACITOR INPUT1 STV810A# INPUT2 OUTPUT2 9 8 V OUT1 V OUT2 R1 Value (typ.) = 10 kω V REF = 2.44 V DISABLE PROGRAM C1 C2 C C4 R2 DISABLE R1 C1 to C4 = 10 µf Figure 6: STV810D# Typical Application Ce 0.1 µf R 1 + R 2 V O2 = V REF R 1 V IN1 V IN DELAY CAPACITOR INPUT1 STV810D# INPUT2 OUTPUT2 8 7 V OUT1 V OUT2 R1 Value (typ.) = 10 kω V REF = 2.44 V Pins 9 to 16 DISABLE PROGRAM 4 6 C1 C2 C DISABLE C4 R1 R2 C1 to C4 = 10 µf 7/12

8 POWER DISSIPATION AND LAYOUT INDICATIONS STV810AD 5 POWER DISSIPATION AND LAYOUT INDICATIONS The power is mainly dissipated by the two device buffers. It can be calculated by the equation: P = (V IN1 -V OUT1 ) x I OUT1 + (V IN2 -V OUT2 ) x I OUT2 The following table lists the different R thja values of these packages with or without a heat sink and the corresponding maximum power dissipation assuming: Maximum Ambient Temperature = 70 C Maximum Junction Temperature = 140 C Device Heat Sink R thja in C/W P MAX in W STV810A# STV810D# No Yes 20.5 No 56 to to 1.75 Yes Figure 7: Thermal Resistance (Junction-to-Ambient) of DIP16 Package without Heat Sink 60 To optimize the thermal conductivity of the copper layer and the exchanges with the air, the solder must cover the maximum amount of this area. RthJA C/W Test Board with On Board square heat sink area Copper area (cm²) (5 µm plus solder) Board is face-down Figure 8: Metal plate mounted near the STV810D# for heat sinking Top View Bottom View 8/12

9 STV810AD 6 PACKAGE MECHANICAL DATA PACKAGE MECHANICAL DATA Figure 9: 9-Pin Plastic Single In Line Package mm Inches Dim. Min. Typ. Max. Min. Typ. Max. A a B b b C c c D d e e L L L L M N /12

10 PACKAGE MECHANICAL DATA STV810AD Figure 10: 16-Pin Plastic Dual In-Line Package, 00-mil Width mm Inches Dim. Min. Typ. Max. Min. Typ. Max. A A A b b c D e E L /12

11 STV810AD 7 REVISION HISTORY REVISION HISTORY Revision Main Changes Date 1.8 General Update; DISABLE pin renamed DISABLE (function remains unchanged). August Thermal Data updated. September Addition of DIP16 package. September Thermal Data updated. Figure 1 and Figure 2 updated. October Order code changed from STV810A and STV810D to STV810A# and STV810D#. Update of V O1RST values in Chapter 2.: Electrical Characteristics on page 4. 1 January /12

12 STV810AD Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 200 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. 12/12

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