LTC1472 Linear Technology, LTC1472 Datasheet
LTC1472
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LTC1472 Summary of contents
Page 1
... CC two sets of digital inputs which are compatible with industry standard PC Card controllers (see Truth Tables). The V output of the LTC1472 can supply current and the VPP output up to 120mA. Both switches have built-in SafeSlot down to protect the card, socket and power supply against accidental short-circuit conditions ...
Page 2
... LOAD LOAD From 3. 100 , C LOAD LOAD From 100 , (Note 5) LOAD LOAD U W INFORMATION ORDER PART TOP VIEW NUMBER 16 V CC(OUT LTC1472CS GND 12 V CC(IN) 11 VPP OUT 10 GND PACKAGE = 100 C, = 100 C/W JA MIN TYP MAX 4 ...
Page 3
... Note 7: Power for the VPP input logic and charge pump circuitry is derived switches. (See CC from the V DD Note 8: To 90% of the final value, C Note 9: To 10% of the final value, C Note 10: To 50% of the initial value, C LTC1472 MIN TYP 3 0 4.5 35 0.01 40 ...
Page 4
... LIMITED OUT C = 150 OUT OUT OUT – 0.2 0 0.2 0.4 0.6 0.8 1.0 TIME (ms) LTC1472 TPC08 (V Section) VPP EN0 = VPP EN1 = Supply Current (3.3V ON) IN 300 T = 25° CC(OUT) PROGRAMMED 250 TO 3.3V, NO LOAD 200 150 100 ...
Page 5
... VPP SUPPLY VOLTAGE IN V Supply Current (ON) DD 120 T = 25°C A VPP PROGRAMMED OUT 100 TO VPP , NO LOAD VPP = VPP SUPPLY VOLTAGE (V) DD LTC1472 TPC14 100 LTC1472 TPC12 = 12V LTC1472 TPC15 5 ...
Page 6
... DD The V pin provides power for the input, charge pump DD and control circuitry for the VPP section of the LTC1472 and therefore must be continuously powered. The standby quiescent current is typically 0.1 A when the VPP is programmed Hi-Z and only rises to micropower levels when the VPP switches are active. ...
Page 7
... VPP EN1 CONVERTER VPP IN + – 10V U OPERATION The LTC1472 protected switch matrix is designed complete single slot solution for PCMCIA compatible card system. The LTC1472 consists of two independent functional sections: the V section, and the VPP switching section. THE V SWITCHING SECTION CC ...
Page 8
... Both switches also have independent thermal shutdown which limits the power dissipation to safe levels. THE VPP SWITCHING SECTION The VPP switching section of the LTC1472 consists of the following functional blocks: VPP Switch Input TTL-CMOS Converters The VPP inputs are designed to accommodate a wide range of 3V and 5V logic families ...
Page 9
... PCMCIA card controllers and to indus- try standard 12V regulators. Interfacing to the CL-PD6710 and the LT Figure 1 shows the LTC1472 interfaced to a standard PCMCIA slot controller and an LT1301 step-up switching regulator. The LTC1472 accepts logic control directly from the CL-PD6710 and in turn, controls the LT1301 to provide clean 12V VPP programming power when re- quired ...
Page 10
... In this case still good practice to use 0.1 F capacitors as close as possible to the LTC1472, especially if the power supply output capacitors are more than 2" away on the printed circuit board. ...
Page 11
... PMOS VPP switch gate may start at ground potential and the VPP output may be inadvertently forced to 12V. Although, not advisable possible to power the 12V VPP supply pin of the LTC1472 prior to application power. Only about 50 A flows to the VPP these conditions. ...
Page 12
... VPP EN0 V VPP EN1 CC(OUT EN0 CC CC(OUT) V EN1 10k CC GND GND 12V + 47 F 0.1 F 16V TANT 0 12V, Hi-Z CC VPP1 VPP2 0.1 F PCMCIA CARD SLOT V CC OFF, 3.3V TANT 0 12V, Hi-Z CC VPP1 0.1 F VPP2 PCMCIA CARD SLOT V CC OFF, 3.3V LTC1472-TA02 TANT ...
Page 13
... SHDN IN IN VPP 0.1 F VPP OUT V CC(IN) LTC1472 V DD VPP EN0 V VPP EN1 CC(OUT EN0 V CC CC(OUT) _5 10k V EN1 CC GND GND LTC1472 12V + 47 F 0.1 F 16V TANT 0 12V, Hi-Z CC VPP1 VPP2 0.1 F PCMCIA CARD SLOT V CC OFF, 3.3V LTC1472 TA03 TANT 13 ...
Page 14
... SHDN IN IN VPP 0V, V VPP OUT V 0.1 F CC(IN) LTC1472 V DD VPP EN0 V VPP EN1 CC(OUT) V EN0 V CC CC(OUT 10k V EN1 CC TANT GND GND 12V + 1 F TANT , 12V, Hi-Z CC VPP1 VPP2 PCMCIA CARD SLOT V CC OFF, 3.3V LTC1472 TA04 ...
Page 15
... LTC1472 V DD VPP EN0 V VPP EN1 CC(OUT) V EN0 V CC CC(OUT) + 10k V EN1 CC GND GND LTC1472 0V 12V, Hi-Z CC VPP1 0.1 F VPP2 PCMCIA CARD SLOT V CC OFF, 3.3V TANT 0V 12V, Hi-Z CC VPP1 0.1 F VPP2 PCMCIA CARD SLOT V CC OFF, 3.3V LTC1472 TA05 TANT 15 ...
Page 16
... LTC1472 PACKAGE DESCRIPTION 0.010 – 0.020 45 (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.016 – 0.050 0.406 – 1.270 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). RELATED PARTS See PCMCIA Product Family table on the first page of this data sheet. ...