Linear Technology LTC1472 Datasheet

LTC1472

FEATURES

■

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 R

■

Guaranteed 1A VCC 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

NMOS Switches

DS(ON)

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APPLICATIONS

■

Notebook Computers

■

Palmtop Computers

■

Pen-Based Computers

■

Handi-Terminals

■

Bar-Code Readers

Protected PCMCIA V

CC

and

VPP Switching Matrix

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DESCRIPTION

The LTC®1472 switching matrix routes power to both the
VCC and VPP power supply pins of the PCMCIA compatible
card socket. The V
between three operating states: OFF, 3.3V, and 5V. The
VPP output is switched between four operating states: 0V,
VCC, 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 VCC output of the LTC1472 can supply up to 1A of
current and the VPP output up to 120mA. Both switches
have built-in SafeSlotTM current limiting and thermal shut­down to protect the card, socket and power supply against
accidental short-circuit conditions.

The LTC1472 is designed to conserve power by automati­cally 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.

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

SafeSlot is a trademark of Linear Technology Corporation.

output of the LTC1472 is switched

CC

TYPICAL APPLICATION

Protected PCMCIA VCC and VPP Card Driver

3.3V

5V

CARD SLOT

CONTROLLER

PCMCIA

0.1µF

0.1µF

3V

IN

5V

IN

LTC1472

V

DD

VPP EN0

VPP EN1
V

EN0

CC

V

EN1

CC

GND

VPP

SHDN

VPP

V

CC(IN)

V

CC(OUT)

IN

TO 12V REGULATOR
OV, V

OUT

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0.1µF

, 12V, Hi-Z

CC

0.1µF

OFF, 3.3V, 5V

+

10k

12V

1µF

VPP1
VPP2

PCMCIA

CARD SLOT
V

CC

V

CC

LTC1472-TA01

Linear Technology PCMCIA Product Family

DEVICE DESCRIPTION PACKAGE

LT®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 VCC 5V/3.3V Switch Matrix 8-Pin SO
LTC1471 Dual Protected VCC 5V/3.3V Switch Matrix 16-Pin SO*
LTC1472 Protected VCC and VPP Switch Matrix 16-Pin SO*
*Narrow Body

1

LTC1472

TOP VIEW

S PACKAGE

16-LEAD PLASTIC SO



T

JMAX

= 100°C, θJA = 100°C/W

1
2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

V

CC(OUT)



5V

IN



V

CC

EN1

V

CC

EN0

VPP

IN



SHDN
VPP EN0
VPP EN1



V

CC(OUT)

3V

IN

3VIN
GND
V

CC(IN)

VPP

OUT

GND
V

DD

WW

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ABSOLUTE MAXIMUM RATINGS

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PACKAGE/ORDER INFORMATION

5VIN Supply Voltage ................................... – 0.3V to 7V

3VIN Supply Voltage ................................... –0.3V to 7V

VPPIN Supply Voltage ............................ –0.3V to 13.2V

V
V
VPP
V

Supply Voltage...................................–0.3 to 7V

CC(IN)

Supply Voltage ............................... –0.3V to 7V

DD(IN)

(OFF) ........................................ –0.3V to 13.2V

OUT

CC(OUT)

(OFF) ............................................ –0.3V to 7V

Enable Inputs.............................................. –0.3V to 7V

VPP
V

Short-Circuit Duration ........................ Indefinite

OUT

CC(OUT)

Short-Circuit Duration ....................... Indefinite

Operating Temperature Range ..................... 0°C to 70°C

Junction Temperature...........................................100°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

ELECTRICAL CHARACTERISTICS

5VIN = 5V, 3VIN = 3.3V, VPP EN0 = VPP EN1 = OV, TA = 25°C, (Note 1) unless otherwise noted.

(VCC Switch Section)

Consult factory for Industrial and Military grade parts.

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ORDER PART

NUMBER

LTC1472CS

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SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

5V

IN

3V

IN

I

5VIN

I

3VIN

R

ON

I

LKG

I

LIM5V

I

LIM3V

V

CCENH

V

CCENL

I

VCCEN

t

VCC1

t

VCC2

t

VCC3

2

5VIN Supply Voltage Range (Note 2) 4.75 5.25 V
3VIN Supply Voltage Range (Note 3) 0 3.60 V
5VIN Supply Current Program to Hi-Z ● 0.01 10 µA

Program to 5V, No Load
Program to 3.3V, No Load

3VIN Supply Current Program to Hi-Z. ● 0.01 10 µA

Program to 5V, No Load
Program to 3.3V, No Load

5V Switch On Resistance Program to 5V, I

3.3V Switch On Resistance Program to 3.3V, I
Output Leakage Current OFF V
V

5V Current Limit Program to 5V, V

CC(OUT)

V

3.3V Current Limit Program to 3.3V, V

CC(OUT)

VCC Enable Input High Voltage ● 2V
V

Enable Input Low Voltage ● 0.8 V

CC

V

Enable Input Current 0V ≤ V

CC

Delay + Rise Time From 0V to 3.3V, R
Delay + Rise Time From 3.3V to 5V, R
Delay + Rise Time From 0V to 5V, R

EN0 = V

CC

CCEN

= 500mA 0.14 0.18 Ω

OUT

= 500mA 0.12 0.16 Ω

OUT

EN1 = 0V or 5V, 0V ≤ V

CC

= 0V (Note 4) 1 A

CC(OUT)

= 0V (Note 4) 1 A

CC(OUT)

≤ 5V ● ±1 µA

= 100Ω, C

LOAD

LOAD

LOAD

= 100Ω, C

= 100Ω, C

LOAD

LOAD

LOAD

≤ 5V ● ±10 µA

CC(OUT)

= 1µF (Note 5) 0.2 0.32 1 ms
= 1µF (Note 5) 0.2 0.52 1 ms

= 1µF (Note 5) 0.2 0.38 1 ms

● 140 200 µA

● 100 160 µA

● 0.01 10 µA

● 40 80 µA

LTC1472

ELECTRICAL CHARACTERISTICS

VDD = 5V, V

= 5V, VPPIN = 12V, V

CC(IN)

CCEN0

= V

CCEN1

(VPP Switch Section)

= 0V, TA= 25°C, (Note 1), unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

CC(IN)

VPP
V

DD

I

CCIN

I

PPIN

I

DD

I

VPPOUT

R

ON

VPP
VPP
I

VPPEN

V

SDH

V

SDL

I

LIMVCC

I

LIMVPP

t

VPP1

t

VPP2

t

VPP3

t

VPP4

t

VPP5

t

VPP6

t

VPP7

t

VPP8

IN

ENH

ENL

VCC Input Voltage Range ● 3 5.5 V
VPP Input Voltage Range (Note 6) ● 0 12.6 V
Logic Supply Voltage Range (Note 7) ● 4.5 5.5 V
V

Supply Current, No Load Program to VPPIN or V

CC(IN)

Program to 0V or Hi-Z

VPPIN Supply Current, No Load Program to VPPIN or V

Program to 0V or Hi-Z

VDD Supply Current, No Load Program to VPP

Program to V
Program to V

IN

, VPPIN = 0V ● 85 150 µA

CC(IN)

, VPPIN = 12V ● 40 80 µA

CC(IN)

Program to 0V or Hi-Z
Hi-Z Output Leakage Current Program to Hi-Z, 0V < VPP
On Resistance VPP

On Resistance VPP
On Resistance VPP

to VPP

OUT
OUT
OUT

IN

to V

CC(IN)

to GND VDD = 5V, I

VPPIN = 12V, I

V

CC(IN)

= 120mA 0.50 1 Ω

LOAD

= 5V, I

= 5mA 1.70 5 Ω

LOAD

= 1mA 100 250 Ω

SINK

VPPIN = 12V ● 35 60 µA

CC(IN)

CC(IN)

< 12V ● 0.01 10 µA

OUT

● 0.01 10 µA

● 40 80 µA

● 0.01 10 µA

● 70 120 µA

● 0.01 10 µA

VPP Enable Input High Voltage VDD = 5V ● 2V
VPP Enable Input Low Voltage VDD = 5V ● 0.8 V
VPP Enable Input Current 0V < VPP EN < VDD ● ±1 µA
SHDN Output High Voltage Program to 0V, V
SHDN Output Low Voltage Program to VPPIN, I
VPP

Current Limit, V

OUT

VPP

Current Limit, VPP

OUT

CC(IN)

IN

Delay and Rise Time From 0V to V

Program to V

CC(IN)

Program to VPPIN, VPP

CC(IN)

or Hi-Z, I

CC(IN)

= 400µA ● 0.4 V

SINK

, VPP

= 0V (Note 4) 60 mA

OUT

= 0V (Note 4) 100 mA

OUT

= 400µA ● 3.5 V

LOAD

,VPPIN = 0V (Note 8) 5 15 50 µs
Delay and Rise Time From 0V to VPPIN (Note 8) 25 85 250 µs
Delay and Rise Time From V
Delay and Fall Time From VPPIN to V

to VPPIN (Note 8) 30 100 300 µs

CC(IN)

(Note 9) 5 15 50 µs

CC(IN)

Delay and Fall Time From VPPIN to 0V (Note 10) 10 35 100 µs
Delay and Fall Time From V
Output Turn-On Delay From Hi-Z to V

to 0V, VPPIN = 0V (Note 10) 10 30 100 µs

CC(IN)

(Note 8) 5 15 50 µs

CC(IN)

Output Turn-On Delay From Hi-Z to VPPIN (Note 8) 25 85 250 µs

The ● denotes the specifications which apply over the full operating
temperature range.
Note 1: V

ENH

= 5V, V

= 0V. See VCC and VPP Switch Truth Tables for

ENL

programming enable inputs for desired output states.
Note 2: Power for the V

from the 5V

power supply which must be continuously powered. 12V

IN

and 3.3V power is not required to control the NMOS V

input logic and charge pump circuitry is derived

CC

switches. (See

CC

Applications Information.)
Note 3: The two 3V

together and the two V
together. The 3V

supply input pins (14 and 15) must be connected

IN

supply pins do not need to be continuously powered

IN

output pins (1 and 16) must be connected

CC(OUT)

and may drop to 0V when not required.
Note 4: The V

and VPP output are protected with foldback current limit

CC

which reduces the short-circuit (0V) currents below peak permissible
current levels at higher output voltages.

Note 5: To 90% of final value.
Note 6: 12V power is only required when VPP

is programmed to 12V.

OUT

The external 12V regulator can be shutdown at all other times. Built-in
charge pumps power the internal NMOS switches from the 5V V

supply

DD

when 12V is not present.
Note 7: Power for the VPP input logic and charge pump circuitry is derived

from the V

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

power supply which must be continuously powered.

DD

= 0.1µF, R

OUT

= 0.1µF, R

OUT

OUT

= 0.1µF, R

OUT
OUT

= 2.9k.
= 2.9k.

= 2.9k.

OUT

3

LTC1472

TIME (ms)

–0.2

INRUSH CURRENT (A)OUTPUT VOLTAGE (V)



0

1

1.4

LTC1472 TPC09

6

4

0

0.2

0.6

1.0

2

3

2

0

0.4

0.8

1.2

C

OUT

= 150µF

R

OUT

= 6.6Ω

C

OUT

= 150µF

R

OUT

= 6.6Ω

C

OUT

= 15µF

R

OUT

= 6.6Ω

TJ = 25°C

5VIN SUPPLY VOLTAGE (V)

0

0

5V

IN

SUPPLY CURRENT (µA)

50

100

150

200

300

1

234

LTC1472 TPC03

56

250

TA = 25°C V

CC(OUT)


PROGRAMMED
TO 3.3V, NO LOAD

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TYPICAL PERFORMANCE CHARACTERISTICS

(VCC Section) VPP EN0 = VPP EN1 = 0V

5VIN Supply Current (OFF)

5

TA = 25°C V
PROGRAMMED TO OFF

4

3

2

1

SUPPLY CURRENT (µA)

IN

5V

0

–1

0

5

T
PROGRAMMED TO OFF

4

3

2

CC(OUT)

234

1

5VIN SUPPLY VOLTAGE (V)

= 25°C OUTPUT

A

5VIN Supply Current (5V ON) 5VIN Supply Current (3.3V ON)



56

LTC1472 TPC01

300

250

200

150

100

SUPPLY CURRENT (µA)

IN

5V

50

0

TA = 25°C V
PROGRAMMED
TO 5V, NO LOAD

0

1

5VIN SUPPLY VOLTAGE (V)



CC(OUT)

234

56

LTC1472 TPC02

5V Switch Resistance3VIN Supply Current (3.3V ON)3VIN Supply Current (OFF)

120

T
PROGRAMMED TO

100

3.3V, NO LOAD

80

60

= 25°C V

A

CC(OUT)



0.30

0.25

0.20

0.15

V



CC(OUT)

PROGRAMMED
TO 5V

SUPPLY CURRENT (µA)
3V

3.3V SWITCH RESISTANCE (Ω)

4

1

IN

0

–1



0

12

3VIN SUPPLY VOLTAGE (V)

3.3V Switch Resistance

0.30
V



CC(OUT)

PROGRAMMED

0.25
TO 3.3V

0.20

0.15

0.10

0.05

0

0

25 50 75 100

JUNCTION TEMPERATURE (°C)



3



LTC1472 TPC04

LT1472 TPC07

4

125

40

SUPPLY CURRENT (µA)

IN

3V

20

0



0

3

2

1

0

INRUSH CURRENT (A)OUTPUT VOLTAGE (V)



6

4

2

0
–0.2

12

3VIN SUPPLY VOLTAGE (V)

CURRENT

LIMITED

C

= 150µF

OUT

= 10Ω

R

OUT

0

0.2

0.6

0.4
TIME (ms)



C

OUT

R

OUT

0.8

1.0

3



LTC1472 TPC05

TJ = 25°C

= 15µF
= 10Ω

1.2

LTC1472 TPC08

4

1.4

0.10

5V SWITCH RESISTANCE (Ω)

0.05

0

0

25 50 75 100
JUNCTION TEMPERATURE (°C)

125

LT1472 TPC06

Inrush Current (3.3V Switch)Inrush Current (5V Switch)

VPPIN SUPPLY VOLTAGE

0

VPP

IN

SUPPLY CURRENT (µA)

80

100

120

610

LTC1472 TPC12

60

40

24

81214

20

0

TA = 25°C
VPP

IN

= 12V

NO LOAD

VPP

OUT

PROGRAMMED

TO V

CC(IN)

VPP

OUT

PROGRAMMED

TO VPP

IN

W

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TYPICAL PERFORMANCE CHARACTERISTICS

V

100

80

Supply Current (No Load)

CC(IN)

TA = 25°C

VPPIN Supply Current (OFF) VPPIN Supply Current (No Load)

5

TA = 25°C

PROGRAMMED

VPP

OUT

4

TO 0V OR Hi-Z

LTC1472

(VPP Section) VCC EN0 = VCC EN1 = 0V

3

2

1

SUPPLY CURRENT (µA)

IN

VPP

0

–1

0

24

610

VPPIN SUPPLY VOLTAGE

81214

SUPPLY CURRENT (µA)

CC(IN)

V

–20

60

VPP

PROGRAMMED

OUT

OR V

TO VPP

IN

40

20

0

0

VPP

OUT

TO 0V OR Hi-Z

234

1

V

SUPPLY VOLTAGE (V)

CC(IN)

CC(IN)

PROGRAMMED

56

LTC1472 TPC10

VDD Supply Current (OFF) VDD Supply Current (No Load)

120

TA = 25°C

PROGRAMMED

VPP

100

SUPPLY CURRENT (µA)

DD

V

OUT

, NO LOAD

TO VPP

IN

80

60

40

20

0

0

234

1

VDD SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

DD

V

–1

5

TA = 25°C
VPP

4

TO 0V OR Hi-Z

3

2

1

0

0

PROGRAMMED

OUT

234

1

VDD SUPPLY VOLTAGE (V)

56

LTC1472 TPC13

LTC1472 TPC11

56

LTC1472 TPC14

VDD Supply Current (ON)

120

TA = 25°C

PROGRAMMED

VPP

100

SUPPLY CURRENT (µA)

DD

V

OUT

, NO LOAD

TO VPP

IN

80

60

40

20

0

0

VPPIN = 0V

234

1

VDD SUPPLY VOLTAGE (V)

VPPIN = 12V

56

LTC1472 TPC15

Switch Resistances

10



1



SWITCH RESISTANCE (Ω)



0.1
020406080

VCCIN TO VPP

VPPIN TO VPP

TEMPERATURE (°C)

OUT

OUT

 100

LTC1472 TPC16

5