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LTC1472

1472fa

Protected PCMCIA V

and

VPP Switching Matrix

The LTC

1472 switching matrix routes power to both the

and VPP power supply pins of the PCMCIA compatible

card socket. The V

output of the LTC1472 is switched

between three operating states: OFF, 3.3V, and 5V. The

VPP output is switched between four operating states: 0V,

, 12V, and Hi-Z. The output voltages are selected by

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 up to 1A of

current and the VPP output up to 120mA. Both switches

have built-in SafeSlot

current limiting and thermal shut-

down to protect the card, socket and power supply against

accidental short-circuit conditions.

The LTC1472 is designed to conserve power by automati-

cally dropping to 1µA standby current when the two

outputs are switched OFF. A shutdown pin is provided

which holds the external 12V regulator in standby mode

except when required for VPP power.

The LTC1472 is available in 16-pin SO package.

■

Both V

and VPP Switching in a Single Package

■

Built-In Current Limit and Thermal Shutdown

■

16-Pin (Narrow) SOIC Package

■

Inrush Current Limited (Drives 150µF Loads)

■

Continuous 12V Power Not Required

■

Extremely Low R

DS(ON)

NMOS Switches

■

Guaranteed 1A V

Current and 120mA VPP Current

■

1µA Quiescent Current in Standby

■

No External Components Required

■

Compatible with Industry Standard Controllers

■

Break-Before-Make Switching

■

Controlled Rise and Fall Times

■

OpenCable Set Top Box

■

Notebook Computers

■

Palmtop Computers

■

Pen-Based Computers

■

Bar-Code Readers

VPP

VPP EN0

VPP EN1

EN0

EN1

SHDN

VPP

OUT

CC(IN)

CC(OUT)

LTC1472

GND

12V

3.3V

OV, V

, 12V, Hi-Z

VPP1

VPP2

PCMCIA

CARD SLOT

CONTROLLER

PCMCIA

CARD SLOT

OFF, 3.3V, 5V

LTC1472-TA01

1µF

0.1µF

10k

0.1µF

TO 12V REGULATOR

DEVICE DESCRIPTION PACKAGE

1312 Single PCMCIA VPP Driver/Regulator 8-Pin SO

LT1313 Dual PCMCIA VPP Driver/Regulator 16-Pin SO*

LTC1314 Single PCMCIA Switch Matrix 14-Pin SO

LTC1315 Dual PCMCIA Switch Matrix 24-Pin SSOP

LTC1470 Protected V

5V/3.3V Switch Matrix 8-Pin SO

LTC1471 Dual Protected V

5V/3.3V Switch Matrix 16-Pin SO*

LTC1472 Protected V

and VPP Switch Matrix 16-Pin SO*

*Narrow Body

Protected PCMCIA V

and VPP Card Driver

Linear Technology PCMCIA Product Family

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

, LTC and LT are registered trademarks of Linear Technology Corporation.

SafeSlot is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Summary of content (16 pages)

PAGE 1
LTC1472 Protected PCMCIA VCC and VPP Switching Matrix U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO Both VCC and VPP Switching in a Single Package Built-In Current Limit and Thermal Shutdown 16-Pin (Narrow) SOIC Package Inrush Current Limited (Drives 150µF Loads) Continuous 12V Power Not Required Extremely Low RDS(ON) NMOS Switches Guaranteed 1A VCC Current and 120mA VPP Current 1µA Quiescent Current in Standby No External Components Required Compatible with Industry Standard Controllers Break-Before-Mak
PAGE 2
LTC1472 U U W W W 5VIN Supply Voltage ................................... – 0.3V to 7V 3VIN Supply Voltage ....................................– 0.3V to 7V VPPIN Supply Voltage .............................– 0.3V to 13.2V VCC(IN) Supply Voltage ................................... – 0.3 to 7V VDD(IN) Supply Voltage ................................– 0.3V to 7V VPPOUT (OFF) .........................................– 0.3V to 13.2V VCC(OUT) (OFF) .............................................– 0.
PAGE 3
LTC1472 ELECTRICAL CHARACTERISTICS (VPP Switch Section) The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDD = 5V, VCC(IN) = 5V, VPPIN = 12V, VCCEN0 = VCCEN1 = 0V, (Note 2) unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN VCC(IN) VCC Input Voltage Range MAX UNITS 3 5.5 V VPPIN VPP Input Voltage Range (Note 7) VDD Logic Supply Voltage Range (Note 8) ● 0 12.6 V ● 4.5 5.
PAGE 4
LTC1472 U W TYPICAL PERFORMANCE CHARACTERISTICS 5VIN Supply Current (5V ON) 5VIN Supply Current (OFF) 2 1 250 5VIN SUPPLY CURRENT (µA) 3 300 TA = 25°C VCC(OUT) PROGRAMMED TO 5V, NO LOAD 200 150 100 50 0 0 1 5 2 3 4 5VIN SUPPLY VOLTAGE (V) 6 0 1 5 2 3 4 5VIN SUPPLY VOLTAGE (V) 3 2 1 TA = 25°C VCC(OUT) PROGRAMMED TO 3.3V, NO LOAD 80 60 40 0.20 0.15 0.10 0 4 OUTPUT VOLTAGE (V) INRUSH CURRENT (A) 0.10 0.
PAGE 5
LTC1472 U W TYPICAL PERFORMANCE CHARACTERISTICS (VPP Section) VCC EN0 = VCC EN1 = 0V VCC(IN) Supply Current (No Load) VPPIN Supply Current (OFF) 100 60 VPPOUT PROGRAMMED TO VPPIN OR VCC(IN) 40 20 0 VPPOUT PROGRAMMED TO 0V OR Hi-Z 4 3 2 1 0 –1 2 3 4 5 VCC(IN) SUPPLY VOLTAGE (V) 2 8 6 10 4 VPPIN SUPPLY VOLTAGE 100 80 VPPOUT PROGRAMMED TO VPPIN 60 40 VPPOUT PROGRAMMED TO VCC(IN) 20 12 14 0 8 6 10 4 VPPIN SUPPLY VOLTAGE 2 LTC1472 TPC11 LTC1472 TPC10 VDD Supply Current (OFF) 12 14 LTC1
PAGE 6
LTC1472 U U U PIN FUNCTIONS Enable Input (Pins 3,4,7,8) VCC(IN) Supply (Pin 12) The two VCC and two VPP Enable inputs are designed to interface directly with industry standard PCMCIA controllers. They are high impedance CMOS gates with ESD protection diodes to ground, and should not be forced above 5VIN or below ground. Both sets of inputs have about 100mV of built-in hysteresis to ensure clean switching between operating modes.
PAGE 7
LTC1472 W BLOCK DIAGRAM 5VIN GATE CHARGE AND DISCHARGE CONTROL LOGIC VCC EN0 VCC EN1 TTL-TO-CMOS CONVERTER BREAK-BEFOREMAKE SWITCH AND CONTROL OSCILLATOR AND BIAS TTL-TO-CMOS CONVERTER CHARGE PUMP 0.14Ω CURRENT LIMIT AND THERMAL SHUTDOWN GATE CHARGE AND DISCHARGE CONTROL LOGIC VCC(OUT) 0.12Ω 3VIN VDD VPPIN SHDN VPP EN0 TTL-TO-CMOS CONVERTER BREAK-BEFOREMAKE SWITCH VPP EN1 TTL-TO-CMOS CONVERTER GATE CHARGE AND DISCHARGE CONTROL LOGIC OSCILLATOR AND BIAS CHARGE PUMP 0.
PAGE 8
LTC1472 U OPERATION VCC XOR Input Circuitry The LTC1472 ensures that the 3.3V and 5V switches are never turned on at the same time by employing an XOR function which locks out the 3.3V switch when the 5V switch is turned on, and locks out the 5V switch when the 3.3V switch is turned on. This XOR function also makes it possible for the LTC1472 to work with either active-low or active-high PCMCIA VCC switch control logic (see Applications Information for further details). to ground.
PAGE 9
LTC1472 U OPERATION VPP Gate Charge and Discharge Control The VPP switches are designed to ramp slowly (typically tens of µs) between output modes to reduce supply glitching when powering large capacitive loads. cally 100mA when protecting the 12V VPPIN supply and 60mA when protecting the VCC(IN) supply. (Higher operating currents are allowed at higher output voltages). Both switches also have thermal shutdown.
PAGE 10
LTC1472 U W U U APPLICATIONS INFORMATION Interfacing to “365” Type Controllers at the VDD and 5VIN supply pins for proper operation and should always be present when a card is powered (whether it is a 5V or 3.3V only card). The LTC1472 also interfaces directly with “365” type controllers as shown in Figure 2.
PAGE 11
LTC1472 U W U U APPLICATIONS INFORMATION Output Capacitors The VCC(OUT) pin is designed to ramp on slowly, typically 400µs rise time. Therefore, capacitors as large as 150µF can be driven without producing voltage spikes on the 5VIN or 3VIN supply pins (see graphs in Typical Performance Characteristics). The VCC(OUT) pin should have a 0.1µF to 1µF capacitor for noise reduction and smoothing. The VPPOUT pin should have a 0.01µF to 0.1µF capacitor for noise reduction.
PAGE 12
LTC1472 U TYPICAL APPLICATIONS Dual Protected PCMCIA Power Management System 33µH* COILCRAFT DO3316-333 3.3V or 5V + 100µF 10V 6 2 3 MBRS130LT3 12V 7 VIN SW SENSE SEL LT1301 ILIM SHDN PGND GND 8 1 4 + 0.1µF 5 NC 47µF 16V TANT 0.1µF 3.3V 10k 0.1µF 3VIN SHDN 3VIN VPPIN 5VIN 5V 0.1µF 0V, VCC, 12V, Hi-Z VPPOUT VCC(IN) 0.1µF VPP1 VPP2 LTC1472 PCMCIA CARD SLOT VDD A_VPP_PGM VPP EN0 A_VPP_VCC VPP EN1 A_VCC_3 VCC EN0 A_VCC_5 VCC EN1 GND VCC(OUT) OFF, 3.
PAGE 13
LTC1472 U TYPICAL APPLICATIONS Single Protected PCMCIA Power Management System Using the LT1301 Powered from 3.3V or 5V 33µH* COILCRAFT DO3316-333 3.3V OR 5V + 100µF 10V 2 MBRS130LT3 6 7 VIN SW SEL SENSE LT1301 3 ILIM SHDN PGND GND 8 1 12V 4 + 0.1µF 5 NC 47µF 16V TANT 0.1µF 3.3V 10k 0.1µF 3VIN 5V SHDN 3VIN VPPIN 5VIN 0.1µF 0V, VCC, 12V, Hi-Z VPPOUT VCC(IN) 0.1µF LTC1472 CL-PD6710 VPP EN0 VPP_VCC VPP EN1 VCC(OUT) VCC _3 VCC EN0 VCC(OUT) VCC _5 VCC EN1 GND OFF, 3.
PAGE 14
LTC1472 U TYPICAL APPLICATIONS Single Protected PCMCIA Power Management System Using the LT1121 Powered from an Auxiliary Winding for 12V VPP Power *13V TO 20V (MAY BE FROM AUXILIARY WINDING) + 8 10µF 10V IN 5V OUT 100k 12V 1 200pF LT1121CS8 5 SHDN ADJ PGND 121k 2 GND + 1µF TANT 56.2k 3 6, 7 2N7002 3.3V 0.1µF 0.1µF 3VIN 5V SHDN 3VIN VPPIN 5VIN 0.1µF 0V, VCC, 12V, Hi-Z VPPOUT VCC(IN) 0.
PAGE 15
LTC1472 U TYPICAL APPLICATIONS Dual Protected PCMCIA Power Management System Powered by System 12V Supply 12V 0.1µF 3.3V NC 0.1µF 3VIN 5V SHDN 3VIN VPPIN 5VIN 0.1µF 0V, VCC, 12V, Hi-Z VPPOUT 0.1µF VCC(IN) VPP1 VPP2 LTC1472 PCMCIA CARD SLOT VDD A_VPP_PGM VPP EN0 A_VPP_VCC VPP EN1 VCC(OUT) A_VCC _3 VCC EN0 VCC(OUT) A_VCC _5 VCC EN1 GND OFF, 3.3V, 5V 10k + GND VCC VCC 1µF TANT 12V 0.1µF CL-PD6720 3.3V NC 0.1µF 3VIN 5V SHDN 3VIN VPPIN 5VIN 0.
PAGE 16
LTC1472 U PACKAGE DESCRIPTION S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .386 – .394 (9.804 – 10.008) NOTE 3 .045 ±.005 .050 BSC 16 N 15 14 13 12 11 10 9 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 2 3 4 5 .053 – .069 (1.346 – 1.752) .050 (1.270) BSC .014 – .019 (0.