LTC1472_15 Datasheet, PDF (1/16 Pages) Linear Technology – Protected PCMCIA VCC and VPP Switching Matrix

LTC1472
Protected PCMCIA V_CC and
VPP Switching Matrix
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 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-Make Switching}
■ _{Controlled Rise and Fall Times}
U
APPLICATIO S
■ _{OpenCable Set Top Box}
■ _{Notebook Computers}
■ _{Palmtop Computers}
■ _{Pen-Based Computers}
■ _{Bar-Code Readers}
DESCRIPTIO
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.
TYPICAL APPLICATIO
Protected PCMCIA V_CC and VPP Card Driver
3.3V
0.1µF
5V
0.1µF
PCMCIA
CARD SLOT
CONTROLLER
3V_IN
5V_IN
VPP_IN
SHDN
VPP_OUT
LTC1472
V_DD
VPP EN0
VPP EN1 V_CC(IN)
V_CC EN0 V_CC(OUT)
V_CC EN1
GND
12V
0.1µF
TO 12V REGULATOR
OV, V_CC, 12V, Hi-Z
0.1µF
VPP1
VPP2
PCMCIA
CARD SLOT
OFF, 3.3V, 5V
V_CC
V_CC
+
10k
1µF
LTC1472-TA01
Linear Technology PCMCIA Product Family
DEVICE DESCRIPTION
LT^®1312 Single PCMCIA VPP Driver/Regulator
LT1313 Dual PCMCIA VPP Driver/Regulator
LTC1314 Single PCMCIA Switch Matrix
LTC1315 Dual PCMCIA Switch Matrix
LTC1470 Protected V_CC 5V/3.3V Switch Matrix
LTC1471 Dual Protected V_CC 5V/3.3V Switch Matrix
LTC1472 Protected V_CC and VPP Switch Matrix
*Narrow Body
PACKAGE
8-Pin SO
16-Pin SO*
14-Pin SO
24-Pin SSOP
8-Pin SO
16-Pin SO*
16-Pin SO*
1472fa
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