L4949E

L4949E STMICROELECTRONICS | Alldatasheet

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Technical content

MULTIFUNCTION VERY LOW DROP VOLTAGE REGULATOR OPERATING DC SUPPLY VOLTAGE RANGE 5V - 28V TRANSIENT SUPPLY VOLTAGE UP TO 40V EXTREMELY LOW QUIESCENT CURRENT IN STANDBY MODE HIGH PRECISION STANDBY OUTPUT VOLT- AGE 5V ±1% OUTPUT CURRENT CAPABILITY UP TO 100mA VERY LOW DROPOUT VOLTAGE LESS THAN 0.5V RESET CIRCUIT SENSING THE OUTPUT VOLTAGE PROGRAMMABLE RESET PULSE DELAY WITH EXTERNAL CAPACITOR VOLTAGE SENSE COMPARATOR THERMAL SHUTDOWN AND SHORT CIR- CUIT PROTECTIONS

DESCRIPTION

The L4949E is a monolithic integrated 5V voltage regulator with a very low dropout output and addi- tional functions as power-on reset and input volt- age sense. It is designed for supplying the micro- computer controlled systems especially in automotive applications. June 2000 REG 1.23V REF SI SO RES GND D96AT219 PREREGULATOR 5VVS RESET SENSE VS 1.23V CTVOUTVZ BLOCK DIAGRAM ORDERING NUMBERS: L4949E (Minidip) L4949ED (SO8) L4949EP (SO20W) Minidip SO8 SO20W (12+4+4)

Symbol Parameter Value Unit VSDC DC Operating Supply Voltage 28 V VSTR Transient Supply Voltage (T < 1s) 40 V IO Output Current Internally Limited VO Output Voltage 20 V VRES ,V SO Output Voltage 20 V IRES ,ISO Output Current 5 mA VZ Preregulator Output Voltage 7 V IZ Preregulator Output Current 5 mA TJ Junction Temperature -40 to +150 °C Tstg Storage Temperature Range -55 to +150 °C Note: The circuit is ESD protected according to MIL-STD-883C THERMAL DATA Symbol Description Minidip SO-8 SO20L Unit R th j-amb Thermal Resistance Junction-ambient Max 100 200 50 °C/W R th j-pins Thermal Resistance Junction-pins Max 15 °C/W TJSD Thermal Shutdown Junction temperature 165 °C PIN CONNECTIONS VS SI VZ CT GND RES SO V OUT1 D95AT217 VZ CT N.C. GND GND GND GND N.C. N.C. V OUT N.C. GND GND GND GND N.C. VS SI1 RES SO D95AT218MINIDIP/SO8 SO20 L4949E

ELECTRICAL CHARACTERISTICS (VS = 14V; -40°C<T j< 125°C unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit VO Output Voltage T J =2 5°C; IO = 1mA 4.95 5 5.05 V VO Output Voltage 6V < V IN < 28V, 1mA < IO < 50mA 4.90 5 5.10 V VO Output Voltage V IN =4 0 V ; T < 1s 5mA < IO <10 0 mA 4.75 5.25 V VDP Dropout Voltage I O = 10mA IO = 50mA IO = 100mA 0.1 0.2 0.3 0.25 0.4 0.5 V V V V IO Input to Output Voltage Difference in Undervoltage Condition VIN = 4V, IO = 35mA 0.4 V Iouth Max Output Leakage V IN = 25V, VO = 5.5V 20 50 80 µA V OL Line Regulation 6V < V IN < 28V; IO = 1mA 20 mV VOLO Load Regulation 1mA < I O < 100mA 30 mV ILIM Current Limit V O = 4.5V VO = 4.5V, TJ =2 5°C VO = 0V (note 1) 105 120 200 100 400 400 mA mA mA IQSE Quiescent Current I O = 0.3mA; TJ < 100°C 200 300 µA IQ Quiescent Current I O = 100mA 5 mA With this test we guarantee that with no output current the output voltage will not exceed 5.5V RESET V RT Reset Thereshold Voltage V O -0.5V V VRTH Reset Thereshold Hysteresis 50 100 200 mV tRD Reset Pulse Delay C T = 100nF; TR ≥100µs 55 100 180 ms V RL Reset Output Low Voltage R RES = 10KΩ to VO VS ≥ 1.5V 0.4 V IRH Reset Output High Leakage Current VRES =5 V 1 µA VCTth Delay Comparator Thereshold 2 V VCTth, hy Delay Comparator Thereshold Hysteresis 100 mV SENSE Vst Sense Low Thereshold 1.16 1.23 1.35 V V sth Sense Thereshold Hysteresis 20 100 200 mV VSL Sense Output Low Voltage V SI ≤ 1.16V; VS ≥ 3V R SO = 10KΩ to VO 0.4 V ISH Sense Output Leakage V SO = 5V; VSI ≥ 1.5V 1 µA ISI Sense Input Current V SI = 0 -20 -8 -3 µA PREREGULATOR V Z Preregulator Output Voltage IZ =1 0µA 4.5 5 6 V IZ Preregulator Output Current 10 µA Note 1: Foldback characteristic L4949E

APPLICATION INFORMATION

High supply voltage transients can cause a reset output signal disturbation. For supply voltages greater than 8V the circuit shows a high immunity of the reset output against supply transients of more than 100V/µs. For supply voltages less than 8V supply tran- sients of more than 0.4V/µs can cause a reset signal disturbation. To improve the transient behaviour for supply voltages less than 8V a capacitor at pin 3 can be used. A capacitor at pin 3 (C3≤ 1µF) reduces also the output noise. FUNCTIONAL DESCRIPTION The L4949E is a monolithic integrated voltage regulator, based on the STM modular voltage regulator approch. Several outstanding features and auxiliary functions are implemented to meet the requirements of supplying microprocessor systems in automotive applications. Nevertheless, it is suitable also in other applications where the present functions are required. The modular ap- proach of this device allows to get easily also other features and functions when required. Voltage Regulator The voltage regulator uses an Isolated Collector Vertical PNP transistor as a regulating element. Figure 1:FoldbackCharacteristic of V O REG 1.23V REF SI SO RES GND D96AT219 PREREGULATOR 5V VS RESET SENSE VS 1.23V VOUT VZ (optional) VBAT CT V OUT APPLICATION CIRCUIT For stability: CS ≥ 1µF, CO ≥ 4.7µF, ESR < 10Ω at 10KHz Recommended for application: CS =C O =1 0µF to 100µF L4949E

DIM. mm inch A 3.32 0.131 a1 0.51 0.020 B 1.15 1.65 0.045 0.065 b 0.356 0.55 0.014 0.022 b1 0.204 0.304 0.008 0.012 D 10.92 0.430 E 7.95 9.75 0.313 0.384 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 6.6 0.260 I 5.08 0.200 L 3.18 3.81 0.125 0.150 Z 1.52 0.060 OUTLINE AND MECHANICAL DATA L4949E

DIM. mm inch A 1.75 0.069 a1 0.1 0.25 0.004 0.010 a2 1.65 0.065 a3 0.65 0.85 0.026 0.033 b 0.35 0.48 0.014 0.019 b1 0.19 0.25 0.007 0.010 C 0.25 0.5 0.010 0.020 c1 45 ° (typ.) D (1) 4.8 5.0 0.189 0.197 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 F (1) 3.8 4.0 0.15 0.157 L 0.4 1.27 0.016 0.050 M 0.6 0.024 S8 ° (max.) (1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not excee d 0.15mm (.006inch). SO8 OUTLINE AND MECHANICAL DATA L4949E

A eB D E L K H A1 C SO20MEC hx4 5° SO20 DIM. mm inch A 2.35 2.65 0.093 0.104 A1 0.1 0.3 0.004 0.012 B 0.33 0.51 0.013 0.020 C 0.23 0.32 0.009 0.013 D 12.6 13 0.496 0.512 E 7.4 7.6 0.291 0.299 e 1.27 0.050 H 10 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 L 0.4 1.27 0.016 0.050 K0 °(min.)8°(max.) OUTLINE AND MECHANICAL DATA L4949E

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. Specification 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  2000 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com L4949E