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| GSG Gunter Semiconductor GmbH TFB4004 EDITION 09/00 ISDN Power feeder with 5 V logic For inquiry please contact : China Tel: 0086-755-3200442 Fax: 0086-755-3355520 Hong Kong Tel : 00852-26190748 Fax: 00852-24948080 e-mail sales@gsg-asia.com Edition 09/00 ISDN Power Feeder with 5V Logic Short Description The integrated circuit TFB4004T is designed for feeding two and four wire ISDN transmission lines. The TFB4004T feeds transmission lines up to 150mA per each output. The integrated circuit is fabricated in 60V MIX technology (BCD-MOS). DMOS power transistors with current limitation, overtemperature and short current protection are used for driving the lines. Features * Power supply for up to four transmission lines * Overload protection for each output * Separate control for each output * Maximum programmable output current limit 150mA per line * 5V logic interface * Status detection for each line output * SOP 28 Block Diagram L1 S1 L2 S2 L3 S3 L4 S4 C1 C2 C3 C4 CS Reset Thermal Protection Control Logic Overload Protection S1 S2 S3 S4 CPRG VCC VBATT GND Pinning Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Symbol VCC CPGR C2 S2 L2 VBATT VBATT VBATT VBATT L3 S3 C3 n.c. CS RST n.c. C4 S4 L4 VBATT VBATT VBATT VBATT L1 S1 C1 TP GND Function Positive supply voltage Current limit, programmable by external resistor Control input switch 2, pull down Output status detection switch 2, pull up Feeding output switch 2 Negative supply voltage Negative supply voltage Negative supply voltage Negative supply voltage Feeding output switch 3 Output status detection switch 3, pull up Control input switch 3, pull down Input chip select, pull up Reset input, pull up Control input switch 4, pull down Output status detection switch 4, pull up Feeding output switch 4 Negative supply voltage Negative supply voltage Negative supply voltage Negative supply voltage Feeding output switch 1 Output status detection switch 1, pull up Control input switch 1, pull down Test pin, don' connect t Ground Functional Description The TFB4004T is designed to feed the S0 and Up0 lines in digital exchanges. The IC includes four feeding output stages. Each output is able to deliver a nominal output current in the range from 50mA to 150mA. The output current limit is programmable by an external resistor connected to ground. The resistor value is calculated by: RCPRG = ( 2 * 1.25V / IOmax ) * 1000 The current limitation response time is about 100 millisecond. This delay avoids a failure detection caused by current peaks when the line outputs turn-on. All outputs are protected against overload and overtemperature. The TFB4004T also contains a parallel logic interface to control each output stage separately. The status outputs are open collector outputs with internal 15k pull-up resistors. 09/00 TFB4004T 2 Functional Description (cont.) In normal operation the feeding switches Ln are ON and the feeding current is lower than the programmed current limit. The temperature protection is not active. The status outputs Sn are LOW. The status outputs change to HIGH if one ore more of the following conditions are valid: a) Feeding switches Ln are OFF controlled by Cn. b) RESET condition (external or internal). c) Feeding switches are ON controlled by Cn, but the feeding current exceeds the programmed current limit. d) The temperature protection is active. The temperature protection has two trip points with hysteresis. When the junction temperature reaches 145C and output currents are higher than the programmed limit the respective outputs are switched-off. These outputs can be switched-on with a new HIGH signal at Cn after the temperature degreased. When the temperature exceeds 155C a RESET signal is generated internally. All outputs Ln are forced to switch-off. The outputs can be switched-on only with a new HIGH signal at Cn when the temperature dropped down. All feeding outputs are forced to switch-off independent of the control input status, if the Reset input RST is LOW. Therefore the power transistors can not switch-on when the supply voltage ramps up. When the supply voltage raised to normal level it is possible to switch-on the outputs Ln setting the control inputs Cn to HIGH step by step, while CS = RST = HIGH. Function Table Function Feeding output ON, normal mode Feeding output OFF, normal mode RESET Output current exceeds limit Overtemperature Control Input Cn H L x H H RST H H L H H CS H H x H H Feeding Status Output Ln Output Sn ON OFF OFF ON OFF L H H H H Turn-on Order t1 t2 t3 t4 t5 L1 - L4 OFF t6 L1 ON t7 L2 ON t8 L3 ON t9 L4 ON VBATT RST VCC CS C1 C2 C3 C4 X = irrelevant 09/00 TFB4004T ON x x x x x x x ON L x x x x x x ON L ON x x x x x ON H ON x x x x x ON H ON H L L L L ON H ON H H L L L ON H ON H H H L L ON H ON H H H H L ON H ON H H H H L 3 Absolute Maximum Ratings Absolute maximum ratings are limiting values, which can cause damage of the device with exceeding only one parameter. Absolute maximum values are valid for the operational temperature range. Parameter Positive Supply Voltage Negative Supply Voltage Input Voltage (Cn, CS, RST) Output Voltage (Sn) Output Current (Sn) Junction Temperature Storage Temperature Ambient Temperature Thermal Resistance junction-ambient Power Dissipation ESD Voltage (1.5k, 100pF) Pin 3, 12, 17, 26 Pin 14, 15 other pins Symbol VCC VBATT VI VO IO Tj TSTG TA Rthja Ptot VESD -2000 -2000 -2000 +200 +1500 +2000 -40 -15 65 1 Min. -0.3 -64 -0.5 -0.5 Max. 6.0 +0.3 VCC + 0.5 5.75 15 +155 +125 +85 Unit V V V V mA C C C K/W W V Recommended Operating Conditions Parameter Negative Supply Voltage Positive Supply Voltage Input LOW Voltage (Cn, CS, RST) Input HIGH Voltage (Cn, CS, RST) Operating Temperature Symbol VBATT VCC VIL VIH TA Min. -53 4.75 0 2.0 0 Max. -36 5.25 0.8 VCC +70 Unit V V V V C Electrical Characteristics VBATT = -53V, VCC = 5.25V, RCPGR = 16k, TA = 0C to +70C, if not otherwise specified Parameter Positive Supply Current all outputs Ln ON, ILn= 100mA Negative Supply Current all outputs Ln OFF, VBATT = -64V Input HIGH Voltage (Cn, CS, RST) Input LOW Voltage (Cn, CS, RST) Symbol ICC IBATT VIH VIL -2.5 2.0 0.8 Min. Max. 7 Unit mA mA V V 09/00 TFB4004T 4 Electrical Characteristics (cont.) VBATT = -53V, VCC = 5.25V, RCPGR = 16k, TA = 0C to +70C, if not otherwise specified Parameter Input HIGH Current (Cn, CS, RST) VIN = 2.0V Input LOW Current (CS, RST) VIN = 0.8V Output LOW Voltage (Sn) IOL = 3mA Output HIGH Voltage (Sn) Output OFF Current (Ln) VLn = 0 V Symbol IIH IIL VOL VOH IOFF 5.05 100 -200 0.4 Min. Max. 200 Unit A A V V A Package SOP 28 D HE E A A2 A1 Q Z e e Z bp 0,25 M 0,15 Lp Symbol min A A1 A2 bp bp c D E e HE HE Lp Z n 0.1 2.25 0.35 0.23 17.9 7.4 10.2 0.3 0 - Dimensions in mm nom 1.27 28 max 2.65 0.3 2.4 0.49 0.32 18.1 7.6 10.6 0.82 10 - 09/00 TFB4004T 5 c |
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