LHC4913 SERIES 3A POSITIVE LOW DROP VOLTAGE REGULATOR WITH INHIBIT FUNCTION ADVANCE DATA ■ ■ ■ ■ ■ ■ ■ ■ LOW OUTPUT CAPACITANCE: 1µF LOW DROP VOLTAGE: 0.5V @ IO=1A 1.5V @ IO=3A OVERTEMPERATURE PROTECTION OVERCURRENT PROTECTION OUTPUT SHORT CIRCUIT MONITORING, SIGNALLED BY TTL OUTPUT ON/OFF EXTERNAL CONTROL BY MEANS OF TTL COMPATIBLE INPUT ADJUSTABLE CURRENT LIMITATION PROTECTS OUTPUTS FROM DAMAGING SHORTCIRCUITS REMOTE SENSING OPERATION DESCRIPTION The LHC4913 is a positive Voltage Regulator family including both fixed and adjustable versions. Housed into SO-20 slug-up package with stand off zero, it is specifically intended for PowerSO-20 slug-up applications in rugged environments, such as Nuclear Physics, in which it has to withstand large amounts of radiation doses during operating life. The fixed output voltages available are 2.5, 3.0, 3.3, 5.0 and 8.0V. Input voltage ranges from 3 to 12V. SCHEMATIC DIAGRAM August 2002 This is preliminary information on a new product now in development. Details are subject to change without notice. 1/6 LHC4913 SERIES ABSOLUTE MAXIMUM RATINGS Symbol VI VINH Parameter DC Input Voltage INHIBIT Input Voltage Value Unit 14 V VI + 0.5 V Output Current Internally limited Ptot Power Dissipation Internally limited Tstg Storage Temperature Range -40 to +150 °C Top Operating Junction Temperature Range -40 to +125 °C IO Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. THERMAL DATA Symbol Rthj-case Parameter Thermal Resistance Junction-case CONNECTION DIAGRAM (top view) PowerSO-20 slug-up Unit 2 °C/W PIN DESCRIPTION FOR ADJUSTABLE VERSION Pin N° Symbol 1 2 3 4 GND NC NC VI Ground Pin Not Connected Not Connected Positive Supply Voltage 5 VO1 Output Pin 6 VO1 Output Pin 7 8 9 10 11 12 13 14 15 SH-CNTRL OCM NC GND GND INH ADJ NC VO2 16 VO2 17 VI 18 19 20 NC NC GND Name and Function Short Circuit Valve Controlling Over Current Monitoring Not Connected Ground Pin Ground Pin Inhibit Adjustable pin Not Connected Output Pin Output Pin Positive Supply Voltage Not Connected Not Connected Ground Pin ORDERING CODES 2/6 TYPE Power-SO20 slug-up OUTPUT VOLTAGES LHC4913 LHC4913PDU Adjustable LHC4913 SERIES APPLICATION DIAGRAM FOR REMOTE SENSINS OPERATION FOR ADJUSTABLE VERSION FUNCTIONAL DESCRIPTION ADJUSTABLE VERSION The ADJUST pin shall be set at 1.225V with the adequated fraction of VO generated by a resistive divider inserted between VO and GND. The ADJ-GROUND resistor value must not be greater than 2.5 KΩ. For a given VO the following holds: VO=VADJ(1+R 2/R1). OVERTEMPERATURE PROTECTION OPTION The LHC4913 is protected by a junctiontemperature detection circuit, turning the device “OFF” when the temperature attains 175°C. The recovery of the ON mode occurs with a hysteresys of 40 °C. OVERCURRENT PROTECTION The device is equipped with a circuit having the purpose of limiting the maximum load current, in order to protect the output stage against possible overcurrent-related damages. Its threshold can be modified externally by means of a resistor put between the pins SH-CNTRL and VI. For this characteristic, when the load current gets close to the above threshold, the regulation is inhibited. Thus, an excellent operation is granted only up to 66% of preset maximum current. SHORT CIRCUIT MONITORING / SIGNALLING In the event of an overcurrent at the output, a voltage level of 0.4V is present at the OCM pin. In others conditions, this voltage equals VI. REMOTE SENSING FOR ADJ VERSION As pointed out in the pin configuration plot, VO and SENSE are not linked to each other in order to get a regulation with a load located far away from the chip. Under ordinary applications, the SENSE shall be connected to both VO1 & VO2. To obtain the best performances it is recommended to be compliant with the configuration shown in the figure at top page. What can degrade the regulation performances of this configuration is the variable voltage drop between the chip ground and the load termination Lv. This is brought mostly by the current Ib coming from the output power base and going to ground through the driver stage. The degradation amount to (1+R2/R1) x RW1 x IBmax + RW2 x IBmax APPLICATION INFORMATION Recommended VI=12V Max, VO= 1.225V Min. The device is designed to operate with any VI-VO value according to above mentioned and thermal dissipation limits. An input filtering capacitor of 100nF is always mandatory. The two VI pins shall always be connected in parallel, this applies also for the four VO pins. Device stability is granted in any circumstance with a 1µF output capacitor. The device operation is guaranteed with any Vin-Vout dropout under the above thermal constraints. Although two embedded protections first mentioned (the overtemperature and the overcurrent) ensure the L4913 integrity against any fault load condition, it is recommended to comply with the specified absolute maximum ratings also in applications involving fast switching of output currents. To achieve this, a polyester capacitor of at least 470nF, put close to the regulator between input and ground, improves the L4913 reliability by 3/6 LHC4913 SERIES recommended to put one reverse-biased Schottky diodes between output and ground. filtering the overvoltages spikes coming out during this particular operation. To avoid undervoltages spikes leading both input and output well below ground, it is in addition ELECTRICAL CHARACTERISTICS (TJ = 25°C, VI=VO+2.5V, VO=3V, CI = 0.1µF, CO = 1µF (tantalium), unless otherwise specified) Symbol Parameter Test Conditions Max. Unit TJ= -55 to 125°C 3 12 V IO = 5mA TJ= -55 to 125°C 2 2 % IO = 3A TJ= -55 to 125°C 1.23 VI Input Voltage IO = 3A VO Output Voltage Output Current Limit Adjustable ISHORT ∆VO/∆VI Line Regulation VI = VO+2.5V to 12V, ∆VO/∆VI Load Regulation IO = 5mA to 3A Vd Dropout Voltage SVR Quiescent Current Supply Voltage Rejection VINH(OFF) Turn Off Voltage VINH(ON) Turn On Voltage % 0.4 % V IO = 1A TJ= -55 to 125°C 0.5 1 V IO = 2A TJ= -55 to 125°C 0.75 1.5 V TJ= -55 to 125°C 1 2 V VI = VO+2.5V to 12V, VO = 1.23V IO = 5mA On Mode 1.6 4 mA VI = VO+2.5V to 12V, VO = 1.23V IO = 30mA On Mode 2.7 8 mA On Mode VI = VO+2.5V to 12V, VO = 1.23V IO = 300mA 11 24 mA VI = VO+2.5V to 12V, VO = 1.23V IO = 1A On Mode 32 64 mA VI = VO+2.5V to 12V, VO = 1.23V IO = 2A On Mode 64 130 mA VI = VO+2.5V to 12V, VO = 1.23V IO = 3A On Mode 94 200 mA VI = 12V Off Mode 0.3 mA 70 50 dB VINH = 3V VI = VO+2.5V ± 0.5V, IO = 5mA f = 120Hz f = 33KHz TJ= 0 to 125°C 2 V TJ= -55 to 0°C 2.4 V 0.8 TJ= -55 to 125°C VI = 12V Output Capacitance IO = 5mA to 3A ESR Electrical Series Resistance Overcurrent Monitor Voltage Low Overcurrent Monitor Voltage High IO = 5mA to 3A IOCM = -10µA (sourced current) Output Noise Voltage B= 10Hz to 100KHz 4/6 0.1 0.7 Shutdown Input Current eN V A 0.35 CO VOCMH 9 3.8 TJ= -55 to 125°C IINH VOCML IO = 5mA Typ. IO = 400mA IO = 3A Id Min. VINH = 5V 120 µA 1 µF 2 IOCM = 10mA (sinked current)VI = 12V VI = VO+2.5V VI = 12V IO = 1A V 6 Ω 0.4 V VO+2.5 V 12 66 µVrms/V LHC4913 SERIES PowerSO-20 Slug-up MECHANICAL DATA DIM. mm. TYP MIN. 3.25 3 A a1 A2 A4 A5 b c D D1 D2 E e e3 E1 E2 E3 G h H L N R S V 3.15 0.8 0.15 0.4 0.23 15.8 9.4 0.2 MAX. 3.5 3.3 0.1 1 0.25 0.53 0.32 16 9.8 MIN. 0.128 0.118 14.5 1.42 0.547 0.044 11.1 2.9 6.2 0.1 1.1 15.9 1.1 10° 0.429 inch TYP. 0.124 0.031 0.006 0.016 0.09 0.622 0.370 0.008 1 13.9 1.12 0.039 1.27 11.43 10.9 5.8 0 15.5 0.8 0.437 0.114 .0244 0.004 0.043 0.626 0.043 10° 0.228 0.000 0.610 0.031 0.024 8° 7° 0° 5° H N 8° 7° E3 A2 b 0.571 0.056 0.050 0.450 0.6 0° 5° N MAX. 0.138 0.130 0.039 0.039 0.010 0.021 0.013 0.630 0.386 R A4 A5 A c V e D2 (x2) DETAIL A e3 E2 E M h x 45˚ 1 10 DETAIL A E2 E1 0.35 Gage Plane a1 S L -CSEATING PLANE G 20 D1 C (COPLANARITY) 11 PSO20DME D 0088259-B 5/6 LHC4913 SERIES 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. 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