LHC4913

LHC4913 STMICROELECTRONICS | Alldatasheet

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Technical content

I LOW OUTPUT CAPACITANCE: 1 µF I LOW DROP VOLTAGE: 0.5V @ IO =1A 1.5V @ IO =3A I OVERTEMPERATURE PROTECTION I OVERCURRENT PROTECTION I OUTPUT SHORT CIRCUIT MONITORING, SIGNALLED BY TTL OUTPUT I ON/OFF EXTERNAL CONTROL BY MEANS OF TTL COMPATIBLE INPUT I ADJUSTABLE CURRENT LIMITATION PROTECTS OUTPUTS FROM DAMAGING SHORTCIRCUITS I 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 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. LHC4913 SERIES 3A POSITIVE LOW DROP VOLTAGE REGULATOR WITH INHIBIT FUNCTION This is preliminary information on a new product now in development. Details are subject to change without notice. SCHEMATIC DIAGRAM PowerSO-20 slug-up ADVANCE DATA

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. THERMAL DATA CONNECTION DIAGRAM (top view) PIN DESCRIPTION FOR ADJUSTABLE VERSION ORDERING CODES Symbol Parameter Value Unit VI DC Input Voltage 14 V VINH INHIBIT Input Voltage V I+0 . 5 V IO 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 Symbol Parameter PowerSO-20 slug-up Unit Rthj-case Thermal Resistance Junction-case 2° C / W Pin N° Symbol Name and Function

1 GND Ground Pin

2 NC Not Connected

3 NC Not Connected

7 SH-CNTRL Short Circuit Valve Controlling

8 OCM Over Current Monitoring

9 NC Not Connected

10 GND Ground Pin

11 GND Ground Pin

12 INH Inhibit

13 ADJ Adjustable pin

14 NC Not Connected

16 V O2 Output Pin

17 V I Positive Supply Voltage

18 NC Not Connected

19 NC Not Connected

20 GND Ground Pin

TYPE Power-SO20 slug-up OUTPUT VOLTAGES LHC4913 LHC4913PDU Adjustable

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 .F o rag i v e nV O the following holds: VO =V ADJ (1+R2/R1). OVERTEMPERATURE PROTECTION OPTION The LHC4913 is protected by a junction- temperature 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 V 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 V 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 V O1 &V O2 . 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+R 2/R1)xR W1 xIBmax +R W2 xIBmax

APPLICATION INFORMATION

Recommended V I=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 w i t ha1µF 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

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 recommended to put one reverse-biased Schottky diodes between output and ground. ELECTRICAL CHARACTERISTICS (TJ = 25°C, VI=V O +2.5V, VO =3V, CI=0 . 1µF, CO =1 µF (tantalium), unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit VI Input Voltage IO =3 A T J= -55 to 125°C 31 2 V VO Output Voltage IO =5 m A T J= -55 to 125°C 22 % IO =3 A T J= -55 to 125°C 1.23 9 V ISHORT Output Current Limit Adjustable 3.8 A ∆VO /∆ VI Line Regulation V I=V O +2.5V to 12V, I O = 5mA 0.1 % ∆VO /∆ VI Load Regulation I O = 5mA to 3A 0.4 % Vd Dropout Voltage IO =4 0 0 m A T J= -55 to 125°C 0.35 0.7 V IO =1 A T J= -55 to 125°C 0.5 1 V IO =2 A T J= -55 to 125°C 0.75 1.5 V IO =3 A T J= -55 to 125°C 12 V Id Quiescent Current V I=V O +2.5V to 12V, On Mode VO = 1.23V IO = 5mA 1.6 4 mA VI=V O +2.5V to 12V, On Mode VO = 1.23V IO = 30mA 2.7 8 mA VI=V O +2.5V to 12V, On Mode VO = 1.23V IO = 300mA 11 24 mA VI=V O +2.5V to 12V, On Mode VO = 1.23V IO = 1A 32 64 mA VI=V O +2.5V to 12V, On Mode VO = 1.23V IO = 2A 64 130 mA VI=V O +2.5V to 12V, On Mode VO = 1.23V IO = 3A 94 200 mA VI= 12V V INH = 3V Off Mode 0.3 mA SVR Supply Voltage Rejection VI=V O +2.5V ± 0.5V, IO = 5mA f = 120Hz 70 dB f=3 3 K H z 5 0 VINH(OFF) Turn Off Voltage TJ= 0 to 125°C 2V TJ=- 5 5t o0°C 2.4 V VINH(ON) Turn On Voltage TJ=- 5 5t o1 2 5°C 0.8 V IINH Shutdown Input Current VI= 12V V INH =5 V 1 2 0 µA C O Output Capacitance I O = 5mA to 3A 1 µF Resistance IO = 5mA to 3A 2 6 Ω VOCML Overcurrent Monitor Voltage Low IOCM = 10mA (sinked current)VI=1 2 V 0 . 4 V VOCMH Overcurrent Monitor Voltage High IOCM = -10µA (sourced current) VI=V O +2.5V V O +2.5 V VI=1 2 V 1 2 eN Output Noise Voltage B= 10Hz to 100KHz I O = 1A 66 µVrms/V

DIM. mm. inch A 3.25 3.5 0.128 0.138 A2 0.1 0.039 A4 0.8 1 0.031 0.039 b 0.4 0.53 0.016 0.021 c 0.23 0.32 0.09 0.013 D 15.8 16 0.622 0.630 D1 9.4 9.8 0.370 0.386 D2 1 0.039 E 13.9 14.5 0.547 0.571 e3 11.43 0.450 E1 10.9 11.1 0.429 0.437 E2 2.9 0.114 E3 5.8 6.2 0.228 .0244 G 0 0.1 0.000 0.004 h 1.1 0.043 H 15.5 15.9 0.610 0.626 L 0.8 1.1 0.031 0.043 N1 0 ° 10° R 0.6 0.024 S0 ° 8° 0° 8° V5 ° 7° 5° 7° PowerSO-20 Slug-up MECHANICAL DATA e AA2 E D2 (x2) M PSO20DME D E1E2 h x 45˚ S Gage Plane 0.35 L DETAIL A DETAIL A (COPLANARITY) GC - C - SEATING PLANE b c N H N V 101 D120 11 R 0088259-B

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