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LHC4913 SERIES
3A POSITIVE LOW DROP VOLTAGE REGULATOR WITH INHIBIT FUNCTION
ADVANCE DATA
s s
s s s
s
s
s
LOW OUTPUT CAPACITANCE: 1F 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
PowerSO-20 slug-up
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.
SCHEMATIC DIAGRAM
August 2002
This is preliminary information on a new product now in development. Details are subject to change without notice.
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LHC4913 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol VI VINH IO Ptot Tstg Top DC Input Voltage INHIBIT Input Voltage Output Current Power Dissipation Storage Temperature Range Operating Junction Temperature Range Parameter Value 14 VI + 0.5 Internally limited Internally limited -40 to +150 -40 to +125 C C Unit V V
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 PowerSO-20 slug-up 2 Unit C/W
CONNECTION DIAGRAM (top view)
PIN DESCRIPTION FOR ADJUSTABLE VERSION
Pin N 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol GND NC NC VI VO1 VO1 SH-CNTRL OCM NC GND GND INH ADJ NC VO2 VO2 VI NC NC GND Name and Function Ground Pin Not Connected Not Connected Positive Supply Voltage Output Pin Output Pin 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
TYPE LHC4913 Power-SO20 slug-up LHC4913PDU OUTPUT VOLTAGES Adjustable
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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 K. 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 175C. 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 1F 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
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LHC4913 SERIES
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 = 25C, VI=VO+2.5V, VO=3V, CI = 0.1F, CO = 1F (tantalium), unless otherwise specified)
Symbol VI VO ISHORT Parameter Input Voltage Output Voltage IO = 3A IO = 5mA IO = 3A Output Current Limit Adjustable VI = VO+2.5V to 12V, IO = 5mA to 3A IO = 400mA IO = 1A IO = 2A IO = 3A Id Quiescent Current TJ= -55 to 125C TJ= -55 to 125C TJ= -55 to 125C TJ= -55 to 125C On Mode On Mode IO = 5mA VO/VI Line Regulation VO/VI Load Regulation Vd Dropout Voltage Test Conditions TJ= -55 to 125C TJ= -55 to 125C TJ= -55 to 125C Min. 3 2 1.23 3.8 0.1 0.4 0.35 0.5 0.75 1 1.6 2.7 11 32 64 94 0.3 70 50 2 2.4 0.8 120 1 2 0.4 VO+2.5 12 66 Vrms/V 6 0.7 1 1.5 2 4 8 24 64 130 200 Typ. Max. 12 2 9 Unit V % V A % % V V V V mA mA mA mA mA mA mA dB V V V A F V V
VI = VO+2.5V to 12V, VO = 1.23V IO = 5mA VI = VO+2.5V to 12V, VO = 1.23V IO = 30mA
On Mode VI = VO+2.5V to 12V, VO = 1.23V IO = 300mA VI = VO+2.5V to 12V, VO = 1.23V IO = 1A VI = VO+2.5V to 12V, VO = 1.23V IO = 2A VI = VO+2.5V to 12V, VO = 1.23V IO = 3A VI = 12V SVR Supply Voltage Rejection VINH = 3V VI = VO+2.5V 0.5V, IO = 5mA TJ= 0 to 125C TJ= -55 to 0C VINH(ON) Turn On Voltage IINH CO ESR VOCML VOCMH eN Shutdown Input Current Output Capacitance Electrical Series Resistance Overcurrent Monitor Voltage Low Overcurrent Monitor Voltage High Output Noise Voltage TJ= -55 to 125C VI = 12V VINH = 5V IO = 5mA to 3A IO = 5mA to 3A IOCM = 10mA (sinked current)VI = 12V IOCM = -10A (sourced current) B= 10Hz to 100KHz VI = VO+2.5V VI = 12V IO = 1A On Mode On Mode On Mode Off Mode f = 120Hz f = 33KHz
VINH(OFF) Turn Off Voltage
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PowerSO-20 Slug-up MECHANICAL DATA
DIM. A a1 A2 A4 A5 b c D D1 D2 E e e3 E1 E2 E3 G h H L N R S V MIN. 3.25 3 0.8 0.15 0.4 0.23 15.8 9.4 13.9 1.12 10.9 5.8 0 15.5 0.8 0.6 0 5 8 7 0 5 mm. TYP 3.15 MAX. 3.5 3.3 0.1 1 0.25 0.53 0.32 16 9.8 14.5 1.42 11.1 2.9 6.2 0.1 1.1 15.9 1.1 10 MIN. 0.128 0.118 0.031 0.006 0.016 0.09 0.622 0.370 0.547 0.044 0.429 0.228 0.000 0.610 0.031 0.024 8 7 inch TYP. 0.124 MAX. 0.138 0.130 0.039 0.039 0.010 0.021 0.013 0.630 0.386 0.571 0.056 0.437 0.114 .0244 0.004 0.043 0.626 0.043 10
0.2
0.008
1 1.27 11.43
0.039 0.050 0.450
N
N
H A5
E3 A2 A
R A4 c V
b e3 h x 45
e
D2 (x2) DETAIL A
E2 E
M
1
10
DETAIL A E2 E1
0.35 Gage Plane
a1 S L
-CSEATING PLANE G C
20
D1
(COPLANARITY)
11
PSO20DME
D
0088259-B
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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. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2002 STMicroelectronics - Printed in Italy - 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 - United States. (c) http://www.st.com
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