LTC1472
Protected PCMCIA V
CC
and
VPP Switching Matrix
FEATURES
■
■
■
■
■
■
■
■
■
■
■
■
DESCRIPTIO
Both V
CC
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
CC
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
The LTC
®
1472 switching matrix routes power to both the
V
CC
and VPP power supply pins of the PCMCIA compatible
card socket. The V
CC
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,
V
CC
, 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
CC
output of the LTC1472 can supply up to 1A of
current and the VPP output up to 120mA. Both switches
have built-in SafeSlot
TM
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.
, 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.
APPLICATIO S
■
■
■
■
■
OpenCable Set Top Box
Notebook Computers
Palmtop Computers
Pen-Based Computers
Bar-Code Readers
TYPICAL APPLICATIO
3.3V
0.1µF
3V
IN
5V
0.1µF
VPP
OUT
LTC1472
V
DD
VPP EN0
PCMCIA
CARD SLOT
CONTROLLER
VPP EN1
V
CC
EN0
V
CC(IN)
V
CC(OUT)
5V
IN
VPP
IN
SHDN
Protected PCMCIA V
CC
and VPP Card Driver
12V
0.1µF
TO 12V REGULATOR
OV, V
CC
, 12V, Hi-Z
VPP1
0.1µF
VPP2
PCMCIA
CARD SLOT
OFF, 3.3V, 5V
V
CC
V
CC
Linear Technology PCMCIA Product Family
DEVICE
LT
®
1312
LT1313
LTC1314
LTC1315
LTC1470
LTC1471
LTC1472
LTC1472-TA01
DESCRIPTION
Single PCMCIA VPP Driver/Regulator
Dual PCMCIA VPP Driver/Regulator
Single PCMCIA Switch Matrix
Dual PCMCIA Switch Matrix
Protected V
CC
5V/3.3V Switch Matrix
Dual Protected V
CC
5V/3.3V Switch Matrix
Protected V
CC
and VPP Switch Matrix
V
CC
EN1
GND
+
10k
1µF
*Narrow Body
U
PACKAGE
8-Pin SO
16-Pin SO*
14-Pin SO
24-Pin SSOP
8-Pin SO
16-Pin SO*
16-Pin SO*
1472fa
U
U
1
LTC1472
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW
V
CC(OUT)
1
5V
IN
2
V
CC
EN1
3
V
CC
EN0
4
VPP
IN
5
SHDN
6
VPP EN0
7
VPP EN1
8
5V
IN
Supply Voltage ................................... – 0.3V to 7V
3V
IN
Supply Voltage ....................................– 0.3V to 7V
VPP
IN
Supply Voltage .............................– 0.3V to 13.2V
V
CC(IN)
Supply Voltage ................................... – 0.3 to 7V
V
DD(IN)
Supply Voltage ................................– 0.3V to 7V
VPP
OUT
(OFF) .........................................– 0.3V to 13.2V
V
CC(OUT)
(OFF) .............................................– 0.3V to 7V
Enable Inputs ............................................ – 0.3V to 5V
IN
VPP
OUT
Short-Circuit Duration ........................ Indefinite
V
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
16
V
CC(OUT)
15
3V
IN
14
3V
IN
13
GND
12
V
CC(IN)
11
VPP
OUT
10
GND
9
V
DD
ORDER PART
NUMBER
LTC1472CS
S PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 100°C,
θ
JA
= 100°C/W
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
(V
CC
Switch Section) The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications
are at T
A
= 25°C. 5V
IN
= 5V, 3V
IN
= 3.3V, VPP EN0 = VPP EN1 = OV, (Note 2) unless otherwise noted.
SYMBOL
5V
IN
3V
IN
I
5VIN
PARAMETER
5V
IN
Supply Voltage Range
3V
IN
Supply Voltage Range
5V
IN
Supply Current
CONDITIONS
(Note 3)
(Note 4)
Program to Hi-Z
Program to 5V, No Load
Program to 3.3V, No Load
Program to Hi-Z.
Program to 5V, No Load
Program to 3.3V, No Load
Program to 5V, I
OUT
= 500mA
Program to 3.3V, I
OUT
= 500mA
V
CC
EN0 = V
CC
EN1 = 0V or 5V, 0V
≤
V
CC(OUT)
≤
5V
Program to 5V, V
CC(OUT)
= 0V (Note 5)
Program to 3.3V, V
CC(OUT)
= 0V (Note 5)
●
●
●
●
●
●
●
●
●
MIN
4.75
0
TYP
MAX
5.25
3.60
UNITS
V
V
µA
µA
µA
µA
µA
µA
Ω
Ω
µA
A
A
V
0.01
140
100
0.01
0.01
40
0.14
0.12
1
1
2
10
200
160
10
10
80
0.18
0.16
±10
I
3VIN
3V
IN
Supply Current
R
ON
I
LKG
I
LIM5V
I
LIM3V
V
CCENH
V
CCENL
I
VCCEN
t
VCC1
t
VCC2
t
VCC3
5V Switch On Resistance
3.3V Switch On Resistance
Output Leakage Current OFF
V
CC(OUT)
5V Current Limit
V
CC(OUT)
3.3V Current Limit
V
CC
Enable Input High Voltage
V
CC
Enable Input Low Voltage
V
CC
Enable Input Current
Delay + Rise Time
Delay + Rise Time
Delay + Rise Time
0.8
±1
0.2
0.2
0.2
0.32
0.52
0.38
1
1
1
0V
≤
V
CCEN
≤
5V
From 0V to 3.3V, R
LOAD
= 100Ω, C
LOAD
= 1µF (Note 6)
From 3.3V to 5V, R
LOAD
= 100Ω, C
LOAD
= 1µF (Note 6)
From 0V to 5V, R
LOAD
= 100Ω, C
LOAD
= 1µF (Note 6)
2
U
W
U
U
W W
W
V
µA
ms
ms
ms
1472fa
LTC1472
(VPP Switch Section) The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications
are at T
A
= 25°C. V
DD
= 5V, V
CC(IN)
= 5V, VPP
IN
= 12V, V
CCEN0
= V
CCEN1
= 0V, (Note 2) unless otherwise noted.
SYMBOL
V
CC(IN)
VPP
IN
V
DD
I
CCIN
I
PPIN
I
DD
PARAMETER
V
CC
Input Voltage Range
VPP Input Voltage Range
Logic Supply Voltage Range
V
CC(IN)
Supply Current, No Load
VPP
IN
Supply Current, No Load
V
DD
Supply Current, No Load
(Note 7)
(Note 8)
Program to VPP
IN
or V
CC(IN)
VPP
IN
= 12V
Program to 0V or Hi-Z
Program to VPP
IN
or V
CC(IN)
Program to 0V or Hi-Z
Program to VPP
IN
Program to V
CC(IN)
, VPP
IN
= 0V
Program to V
CC(IN)
, VPP
IN
= 12V
Program to 0V or Hi-Z
Program to Hi-Z, 0V < VPP
OUT
< 12V
VPP
IN
= 12V, I
LOAD
= 120mA
V
CC(IN)
= 5V, I
LOAD
= 5mA
V
DD
= 5V, I
SINK
= 1mA
V
DD
= 5V
V
DD
= 5V
0V < VPP EN < VDD
Program to 0V, V
CC(IN)
or Hi-Z, I
LOAD
= 400µA
Program to VPP
IN
, I
SINK
= 400µA
Program to V
CC(IN)
, VPP
OUT
= 0V (Note 5)
Program to VPP
IN
, VPP
OUT
= 0V (Note 5)
From 0V to V
CC(IN)
,VPP
IN
= 0V (Note 9)
From 0V to VPP
IN
(Note 9)
From V
CC(IN)
to VPP
IN
(Note 9)
From VPP
IN
to V
CC(IN)
(Note 10)
From VPP
IN
to 0V (Note 11)
From V
CC(IN)
to 0V, VPP
IN
= 0V (Note 11)
From Hi-Z to V
CC(IN)
(Note 9)
From Hi-Z to VPP
IN
(Note 9)
5
25
30
5
10
10
5
25
●
●
●
●
●
ELECTRICAL CHARACTERISTICS
CONDITIONS
●
●
●
●
●
●
●
●
●
●
●
●
MIN
3
0
4.5
TYP
MAX
5.5
12.6
5.5
UNITS
V
V
V
µA
µA
µA
µA
µA
µA
µA
µA
µA
Ω
Ω
Ω
V
V
µA
V
V
mA
mA
35
0.01
40
0.01
70
85
40
0.01
0.01
0.50
1.70
100
2
60
10
80
10
120
150
80
10
10
1
5
250
0.8
±1
I
VPPOUT
R
ON
Hi-Z Output Leakage Current
On Resistance VPP
OUT
to VPP
IN
On Resistance VPP
OUT
to V
CC(IN)
On Resistance VPP
OUT
to GND
VPP Enable Input High Voltage
VPP Enable Input Low Voltage
VPP Enable Input Current
SHDN Output High Voltage
SHDN Output Low Voltage
VPP
OUT
Current Limit, V
CC(IN)
VPP
OUT
Current Limit, VPP
IN
Delay and Rise Time
Delay and Rise Time
Delay and Rise Time
Delay and Fall Time
Delay and Fall Time
Delay and Fall Time
Output Turn-On Delay
Output Turn-On Delay
VPP
ENH
VPP
ENL
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
3.5
0.4
60
100
15
85
100
15
35
30
15
85
50
250
300
50
100
100
50
250
µs
µs
µs
µs
µs
µs
µs
µs
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
V
ENH
= 5V, V
ENL
= 0V. See V
CC
and VPP Switch Truth Tables for
programming enable inputs for desired output states.
Note 3:
Power for the V
CC
input logic and charge pump circuitry is derived
from the 5V
IN
power supply which must be continuously powered. 12V
and 3.3V power is not required to control the NMOS V
CC
switches. (See
Applications Information.)
Note 4:
The two 3V
IN
supply input pins (14 and 15) must be connected
together and the two V
CC(OUT)
output pins (1 and 16) must be connected
together. The 3V
IN
supply pins do not need to be continuously powered
and may drop to 0V when not required.
Note 5:
The V
CC
and VPP output are protected with foldback current limit
which reduces the short-circuit (0V) currents below peak permissible
current levels at higher output voltages.
Note 6:
To 90% of final value.
Note 7:
12V power is only required when VPP
OUT
is programmed to 12V.
The external 12V regulator can be shutdown at all other times. Built-in
charge pumps power the internal NMOS switches from the 5V V
DD
supply
when 12V is not present.
Note 8:
Power for the VPP input logic and charge pump circuitry is derived
from the V
DD
power supply which must be continuously powered.
Note 9:
To 90% of the final value, C
OUT
= 0.1µF, R
OUT
= 2.9k.
Note 10:
To 10% of the final value, C
OUT
= 0.1µF, R
OUT
= 2.9k.
Note 11:
To 50% of the initial value, C
OUT
= 0.1µF, R
OUT
= 2.9k.
1472fa
3
LTC1472
TYPICAL PERFORMANCE CHARACTERISTICS
5V
IN
Supply Current (OFF)
5
4
3
2
1
0
–1
T
A
= 25°C V
CC(OUT)
PROGRAMMED TO OFF
5V
IN
SUPPLY CURRENT (µA)
300
250
200
150
100
50
0
T
A
= 25°C V
CC(OUT)
PROGRAMMED
TO 5V, NO LOAD
5V
IN
SUPPLY CURRENT (µA)
5V
IN
SUPPLY CURRENT (µA)
0
1
5
2
3
4
5V
IN
SUPPLY VOLTAGE (V)
3V
IN
Supply Current (OFF)
5
4
3
2
1
0
–1
0
T
A
= 25°C OUTPUT
PROGRAMMED TO OFF
3V
IN
SUPPLY CURRENT (µA)
3V
IN
SUPPLY CURRENT (µA)
80
60
40
20
0
5V SWITCH RESISTANCE (Ω)
3
1
2
3V
IN
SUPPLY VOLTAGE (V)
3.3V Switch Resistance
OUTPUT VOLTAGE (V) INRUSH CURRENT (A)
0.30
0.25
0.20
0.15
0.10
0.05
0
0
25
50
75
100
JUNCTION TEMPERATURE (°C)
125
V
CC(OUT)
PROGRAMMED
TO 3.3V
OUTPUT VOLTAGE (V) INRUSH CURRENT (A)
3.3V SWITCH RESISTANCE (Ω)
4
U W
(V
CC
Section) VPP EN0 = VPP EN1 = 0V
5V
IN
Supply Current (5V ON)
300
250
200
150
100
50
0
5V
IN
Supply Current (3.3V ON)
T
A
= 25°C V
CC(OUT)
PROGRAMMED
TO 3.3V, NO LOAD
6
0
1
5
2
3
4
5V
IN
SUPPLY VOLTAGE (V)
6
0
1
5
2
3
4
5V
IN
SUPPLY VOLTAGE (V)
6
LTC1472 TPC01
LTC1472 TPC02
LTC1472 TPC03
3V
IN
Supply Current (3.3V ON)
120
100
T
A
= 25°C V
CC(OUT)
PROGRAMMED TO
3.3V, NO LOAD
0.30
0.25
0.20
0.15
0.10
0.05
0
5V Switch Resistance
V
CC(OUT)
PROGRAMMED
TO 5V
4
LTC1472 TPC04
0
3
1
2
3V
IN
SUPPLY VOLTAGE (V)
4
LTC1472 TPC05
0
25
50
75
100
JUNCTION TEMPERATURE (°C)
125
LT1472 TPC06
Inrush Current (5V Switch)
3
2
1
0
C
OUT
= 150µF
R
OUT
= 10Ω
C
OUT
= 15µF
R
OUT
= 10Ω
CURRENT
LIMITED
T
J
= 25°C
3
2
1
0
Inrush Current (3.3V Switch)
T
J
= 25°C
C
OUT
= 150µF
R
OUT
= 6.6Ω
6
4
2
0
– 0.2
6
4
2
C
OUT
= 15µF
R
OUT
= 6.6Ω
C
OUT
= 150µF
R
OUT
= 6.6Ω
0
0.2
0.4 0.6 0.8
TIME (ms)
1.0
1.2 1.4
0
0.2
0.4 0.6 0.8
TIME (ms)
1.0
1.2 1.4
0
– 0.2
LT1472 TPC07
LTC1472 TPC08
LTC1472 TPC09
1472fa
LTC1472
TYPICAL PERFORMANCE CHARACTERISTICS
(VPP Section) V
CC
EN0 = V
CC
EN1 = 0V
V
CC(IN)
Supply Current (No Load)
100
T
A
= 25°C
V
CC(IN)
SUPPLY CURRENT (µA)
5
4
3
2
1
0
–1
T
A
= 25°C
VPP
OUT
PROGRAMMED
TO 0V OR Hi-Z
VPP
IN
SUPPLY CURRENT (µA)
VPP
IN
SUPPLY CURRENT (µA)
80
60
40
20
0
–20
VPP
OUT
PROGRAMMED
TO 0V OR Hi-Z
VPP
OUT
PROGRAMMED
TO VPP
IN
OR V
CC(IN)
0
1
3
4
5
V
CC(IN)
SUPPLY VOLTAGE (V)
2
V
DD
Supply Current (OFF)
5
4
T
A
= 25°C
VPP
OUT
PROGRAMMED
TO 0V OR Hi-Z
120
100
V
DD
SUPPLY CURRENT (µA)
V
DD
SUPPLY CURRENT (µA)
3
2
1
0
–1
0
1
5
2
3
4
V
DD
SUPPLY VOLTAGE (V)
V
DD
Supply Current (ON)
120
100
V
DD
SUPPLY CURRENT (µA)
T
A
= 25°C
VPP
OUT
PROGRAMMED
TO VPP
IN
, NO LOAD
SWITCH RESISTANCE (Ω)
80
60
40
VPP
IN
= 12V
20
0
VPP
IN
= 0V
0
1
5
2
3
4
V
DD
SUPPLY VOLTAGE (V)
U W
6
LTC1472 TPC10
VPP
IN
Supply Current (OFF)
120
100
80
60
40
20
0
0
2
8
6
10
4
VPP
IN
SUPPLY VOLTAGE
12
14
VPP
IN
Supply Current (No Load)
T
A
= 25°C
VPP
IN
= 12V
NO LOAD
VPP
OUT
PROGRAMMED
TO VPP
IN
VPP
OUT
PROGRAMMED
TO V
CC(IN)
0
2
8
6
10
4
VPP
IN
SUPPLY VOLTAGE
12
14
LTC1472 TPC11
LTC1472 TPC12
V
DD
Supply Current (No Load)
T
A
= 25°C
VPP
OUT
PROGRAMMED
TO VPP
IN
, NO LOAD
80
60
40
20
0
6
0
1
5
2
3
4
V
DD
SUPPLY VOLTAGE (V)
6
LTC1472 TPC13
LTC1472 TPC14
Switch Resistances
10
VCC
IN
TO VPP
OUT
1
VPP
IN
TO VPP
OUT
6
0.1
0
20
40
60
TEMPERATURE (°C)
80
100
LTC1472 TPC15
LTC1472 TPC16
1472fa
5
FPGA/CPLD
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
