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PDF LTC1471CS Data sheet ( Hoja de datos )
| Número de pieza | LTC1471CS | |
| Descripción | Single and Dual PCMCIA Protected 3.3V/5V VCC Switches | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC1471CS (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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FEATURES
s Single 3.3V/5V Switch in 8-Pin SO Package
s Dual 3.3V/5V Switch in 16-Pin SO Package
s Built-In Current Limit and Thermal Shutdown
s Built-In Charge Pumps (No 12V Required)
s Extremely Low RDS(ON) MOSFET Switches
s Output Current Capability: 1A
s Inrush Current Limited (Drives 150µF Loads)
s Quiescent Current in Standby: 1µA
s No Parasitic Body Diodes
s Built-In XOR Function Eliminates “Glue” Logic
s Break-Before-Make Switching
s Controlled Rise and Fall Times
U
APPLICATIONS
s Notebook Computers
s Palmtop Computers
s Pen-Based Computers
s Handi-Terminals
s PC Card Reader/Writers
s 3.3V/5V Power Supply Switch
TYPICAL APPLICATION
LTC1470/LTC1471
Single and Dual
PCMCIA Protected
3.3V/5V VCC Switches
DESCRIPTION
The LTC®1470 switches the VCC pins of a Personal Com-
puter Memory Card International Association (PCMCIA)
card slot between three operating states: OFF, 3.3V and
5V. Two low RDS(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 SafeSlotTM 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.
Dual Slot PCMCIA 3.3V/5V VCC Switch
5V
0.1µF
PCMCIA
CARD SLOT
CONTROLLER
5VIN 3VIN
AOUT
LTC1471
3.3V
0.1µF
VCC
(Hi-Z/3.3V/5V) VCC
+
1µF 10k
PCMCIA
CARD SLOT
AEN1
AEN0
BEN1
BOUT
BEN0
GND
VCC
(Hi-Z/3.3V/5V) VCC
+
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 VCC 3.3V/5V Switch Matrix
LTC1471 Dual Protected VCC 3.3V/5V Switch Matrix
LTC1472 Protected VCC 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*
1
1 page  
LTC1470/LTC1471
PIN FUNCTIONS
LTC1471
AOUT, BOUT(Pins 1, 16, 8, 9): Output Pins. The outputs
of the LTC1471 are switched between three operating
states: OFF, 3.3V and 5V. These pins are protected against
accidental short circuits to ground by SafeSlot current
limit circuitry which protects the socket, the card, and the
system power supplies against damage. A second level of
protection is provided by thermal shutdown circuitry.
5VIN (Pins 2, 10): 5V Input Supply Pins. The 5VIN supply
pins serve two purposes. The first purpose is as the power
supply input for the 5V NMOS switches. The second
purpose is to provide power for the input, gate drive, and
protection circuitry. These pins must therefore be con-
tinuously powered.
EN1, EN0 (Pins 3, 4, 11, 12): Enable Inputs. The enable
inputs are designed to interface directly with industry
standard PCMCIA controllers and are high impedance
CMOS gates with ESD protection diodes to ground, and
should not be forced below ground. All four inputs have
about 100mV of built-in hysteresis to ensure clean switch-
ing between operating modes. The LTC1471 is designed
to operate without 12V power. The gates of the VCC NMOS
switches are powered by charge pumps from the 5VIN
supply pins (see Applications Information section for
more detail). The enable inputs should be turned off at
least 100µs before the 5VIN power is removed to ensure
that all NMOS switch gates are fully discharged and are in
the high impedance mode.
GND (Pins 5, 13): Ground Connections.
3VIN (Pins 6, 7, 14, 15): 3V Input Supply Pins. The 3VIN
supply pins serve as the power supply input for the 3.3V
switches. These pins do not not provide any power to the
internal control circuitry, and therefore, do not consume
any power when unloaded or turned off.
BLOCK DIAGRAM (LTC1470 or 1/2 LTC1471)
TTL-TO-CMOS
EN0 CONVERTER
TTL-TO-CMOS
EN1 CONVERTER
BREAK-BEFORE-
MAKE SWITCH
AND CONTROL
GATE CHARGE
AND
DISCHARGE
CONTROL LOGIC
OSCILLATOR
AND BIAS
CHARGE
PUMP
GATE CHARGE
AND
DISCHARGE
CONTROL LOGIC
5VIN
0.14Ω
CURRENT LIMIT
AND THERMAL
SHUTDOWN
OUTPUT
0.12Ω
3VIN
LTC1470-BD01
5
5 Page 
TYPICAL APPLICATIONS
LTC1470/LTC1471
Dual Slot PCMCIA Controller with SafeSlot Current Limit
Protection Using LT1313 Dual VPP Regulator/Driver
VLOGIC
A_VPP_PGM
A_VPP_VCC
B_VPP_PGM
B_VPP_VCC
VPP_VALID
CL-PD6720
A_VCC _3V
A_VCC _5V
B_VCC _3V
B_VCC _5V
13V TO 20V*
51k AVS
AEN0
AEN1
AVALID
0.1µF
BVS
AVPPOUT +
1µF
ASENSE
LT1313
BEN0
BEN1
BVALID
GND
BVPPOUT +
1µF
BSENSE
GND
3.3V
0.1µF
A3VIN A3VIN B3VIN B3VIN
5V
A5VIN
BOUT
(OFF/3.3V/5V)
0.1µF
B5VIN
BOUT +
1µF 10k
LTC1471
TANT
AEN0
AEN1
BEN0
BEN1
GND
AOUT
AOUT
GND
(OFF/3.3V/5V)
+ 1µF
10k
TANT
* FROM OVERWINDING ON 3.3V OR 5V INDUCTOR IN SYSTEM POWER SUPPLY.
SEE FIGURES 3, 4 FOR FURTHER DETAILS
VPP1
VPP2
VCC
PCMCIA
CARD SLOT
#1
VPP1
VPP2
VCC
PCMCIA
CARD SLOT
#2
1470/71 TA04
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1471CS.PDF ] | |
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