LTC1470_1 Datasheet, PDF (1/12 Pages) Linear Technology – Single and Dual PCMCIA Protected 3.3V/5V VCC Switches

FEATURES
■ _{Single 3.3V/5V Switch in 8-Pin SO Package}
■ _{Dual 3.3V/5V Switch in 16-Pin SO Package}
■ _{Built-In Current Limit and Thermal Shutdown}
■ _{Built-In Charge Pumps (No 12V Required)}
■ _{Extremely Low RDS(ON) MOSFET Switches}
■ _{Output Current Capability: 1A}
■ _{Inrush Current Limited (Drives 150µF Loads)}
■ _{Quiescent Current in Standby: 1µA}
■ _{No Parasitic Body Diodes}
■ _{Built-In XOR Function Eliminates “Glue” Logic}
■ _{Break-Before-Make Switching}
■ _{Controlled Rise and Fall Times}
■ _{Available in 8-Pin and 16-Pin SO Packages}
U
APPLICATIO S
■ _{Set Top Box/Open Cable}
■ _{Notebook Computers}
■ _{Palmtop Computers}
■ _{Pen-Based Computers}
■ _{Handi-Terminals}
■ _{3.3V/5V Power Supply Switch}
LTC1470/LTC1471
Single and Dual
PCMCIA Protected
3.3V/5V V_CC Switches
DESCRIPTIO
The LTC^®1470 switches the V_CC pins of a Personal Com-
puter Memory Card International Association (PCMCIA)
card slot between three operating states: OFF, 3.3V and
5V. Two low R_DS(ON) N-channel power MOSFETs are
driven by a built-in charge pump which generates a
voltage higher than the supply voltage to fully enhance
each switch when selected by the input control logic.
The LTC1470 inputs are compatible with industry stan-
dard PCMCIA controllers. A built-in XOR ensures that both
switches are never on at the same time. This function also
makes the LTC1470 compatible with both active-low and
active-high controllers (see Applications Information sec-
tion). The switch rise times are controlled to eliminate
power supply glitching.
The LTC1470 features built-in SafeSlot^TM current limit and
thermal shutdown. The output is limited to 1A during short
circuit to ground but 2A of peak operating current is
allowed.
The LTC1471 is a dual version of the LTC1470 and is
available in a 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
Dual Slot PCMCIA 3.3V/5V V_CC Switch
5V
0.1µF
PCMCIA
CARD SLOT
CONTROLLER
5V_IN 3V_IN
AOUT
LTC1471
3.3V
0.1µF
V_CC
(Hi-Z/3.3V/5V) V_CC
+
1µF 10k
PCMCIA
CARD SLOT
AEN1
AEN0
BEN1
BOUT
BEN0
GND
V_CC
(Hi-Z/3.3V/5V) V_CC
+
1µF 10k
PCMCIA
CARD SLOT
1470/71 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 Single Protected V_CC 3.3V/5V Switch Matrix
LTC1471 Dual Protected V_CC 3.3V/5V 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*
14701fa
1