LTC1471 LINER [Linear Technology], LTC1471 Datasheet

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LTC1471

Manufacturer Part Number
LTC1471
Description
Single and Dual PCMCIA Protected 3.3V/5V VCC Switches
Manufacturer
LINER [Linear Technology]
Datasheet

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APPLICATIONS
TYPICAL
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 R
Output Current Capability: 1A
Inrush Current Limited (Drives 150 F Loads)
Quiescent Current in Standby: 1 A
No Parasitic Body Diodes
Built-In XOR Function Eliminates “Glue” Logic
Break-Before-Make Switching
Controlled Rise and Fall Times
Notebook Computers
Palmtop Computers
Pen-Based Computers
Handi-Terminals
PC Card Reader/Writers
3.3V/5V Power Supply Switch
CONTROLLER
CARD SLOT
PCMCIA
0.1 F
5V
Dual Slot PCMCIA 3.3V/5V V
APPLICATION
AEN1
AEN0
BEN1
BEN0
5V
LTC1471
IN
U
DS(ON)
GND
AOUT
BOUT
3V
IN
MOSFET Switches
+
+
(Hi-Z/3.3V/5V)
(Hi-Z/3.3V/5V)
1 F
1 F
0.1 F
U
3.3V
CC
10k
10k
Switch
V
V
V
V
CC
CC
CC
CC
CARD SLOT
CARD SLOT
PCMCIA
PCMCIA
1470/71 TA01
The LTC
puter Memory Card International Association (PCMCIA)
card slot between three operating states: OFF, 3.3V and
5V. Two low R
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
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.
SafeSlot is a trademark of Linear Technology Corporation.
DEVICE
LT
LT1313
LTC1314 Single PCMCIA Switch Matrix
LTC1315 Dual PCMCIA Switch Matrix
LTC1470 Single Protected V
LTC1471 Dual Protected V
LTC1472 Protected V
*Narrow Body
DESCRIPTION
®
, LTC and LT are registered trademarks of Linear Technology Corporation.
1312
®
DESCRIPTION
Single PCMCIA VPP Driver/Regulator
Dual PCMCIA VPP Driver/Regulator
1470 switches the V
Linear Technology PCMCIA Product Family
3.3V/5V V
DS(ON)
CC
PCMCIA Protected
U
and VPP Switch Matrix
CC
CC
N-channel power MOSFETs are
3.3V/5V Switch Matrix
LTC1470/LTC1471
3.3V/5V Switch Matrix
Single and Dual
CC
pins of a Personal Com-
CC
TM
Switches
current limit and
PACKAGE
8-Pin SO
16-Pin SO*
14-Pin SO
24-Pin SSOP
8-Pin SO
16-Pin SO*
16-Pin SO*
1

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LTC1471 Summary of contents

Page 1

... 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. ...

Page 2

... OUT Program to Hi- (Note 3) OUT Program to 3.3V (Note 4) OUT Program to 5V (Note 4) OUT ORDER PART TOP VIEW NUMBER 16 AOUT 15 A3V IN LTC1471CS 14 A3V IN 13 GND 12 BEN0 11 BEN1 10 B5V IN 9 BOUT S PACKAGE = 100 C unless otherwise noted. A MIN TYP MAX 2 ...

Page 3

... Note 1: For the LTC1470, the two output pins (1, 8) must be connected together and the two 3.3V supply input pins ( must be connected together. For the LTC1471, the two AOUT pins (1, 16) must be connected together, the two BOUT pins (8, 9) must be connected together, the two ...

Page 4

... Input Supply Pins. The 3V IN pins serve as the power supply input for the 3.3V switches. These pins do not provide any power to the internal control Enable CC circuitry and therefore do not consume any power when unloaded or turned off. (LTC1470 or 1/2 LTC1471) Inrush Current (5V Switch) 3 CURRENT 2 LIMITED 1 0 ...

Page 5

... 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 ...

Page 6

... LTC1470/LTC1471 U OPERATION The LTC1470 (or 1/2 of the LTC1471) consists of the following functional blocks: Input TTL/CMOS Converters The enable inputs are designed to accommodate a wide range of 3V and 5V logic families. The input threshold voltage is approximately 1.4V with approximately 100mV of hysteresis. The inputs enable the bias generator, the gate charge pumps and the protection circuity which are powered from the 5V supply ...

Page 7

... NMOS switch gates Hi-Z are fully discharged to 0V. Whenever possible, however best to leave the 5V LTC1470/LTC1471 quiescent current drops to <1 A with all the switches turned off and therefore no 5V power is consumed in the standby mode. LTC1470/LTC1471 supply pins (see graphs in Typical Perfor- IN pin(s) continuously powered ...

Page 8

... VPP power. And, because the LTC1470/LTC1471 do not require 12V power to operate (only 5V), the 12V VPP regulation and switching may be operated separately from the 3.3V/5V V switching. This increases system configuration flexibility and reduces total system cost by eliminating the need for a third regulator for 12V power ...

Page 9

... MBRS130T3 T1 100 1000pF 0.033 100 28 – 12k Q3 2N7002 Q4 2N7002 *CTX02-12753 COILTRONICS (407) 241-7876 LTC1470/LTC1471 pins of the LT1313. (See the LT1312 and OUT D2 MBRS1100 15V AUX SUPPLY 3.37 18V 68 F 3.3V OUTPUT C3 220 F 1470/71 F04 9 ...

Page 10

... SEE FIGURES 3, 4 FOR FURTHER DETAIL 10 (Systems with No 12V Power Requirements) 0.1 F A3V A3V B3V B3V A5V BOUT IN (OFF/3.3V/5V) 0.1 F B5V BOUT TANT LTC1471 AEN0 AEN1 BEN0 AOUT (OFF/3.3V/5V) BEN1 AOUT + GND GND 1 F TANT 13V TO 20V* 51k V S EN0 VPP OUT + EN1 LT1312 ...

Page 11

... A3V B3V B3V A5V 5V BOUT IN 0.1 F B5V BOUT IN LTC1471 AEN0 AEN1 BEN0 AOUT BEN1 AOUT GND GND LTC1470/LTC1471 0.1 F VPP1 VPP2 PCMCIA CARD SLOT VPP1 VPP2 PCMCIA PCMCIA CARD SLOT CARD SLOT (OFF/3.3V/5V 10k TANT (OFF/3 ...

Page 12

... LTC1470/LTC1471 PACKAGE DESCRIPTION 0.010 – 0.020 45 (0.254 – 0.508) 0.008 – 0.010 0 – 8 TYP (0.203 – 0.254) 0.016 – 0.050 0.406 – 1.270 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). 0.010 – 0.020 45 (0.254 – ...

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