LTC1314 データシートの表示（PDF） - Linear Technology

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LTC1314

PCMCIA Switching Matrix with Built-In N-Channel VCC Switch Drivers

Linear Technology 

LTC1314/LTC1315

APPLICATIONS INFORMATION

the asymmetrical turn-on and turn-off of the MOSFETs.

The LT1301 switching regulator is in shutdown mode and

consumes only 10µA until the VPP pins require 12V.

The VPP switching is accomplished by a combination of

the LTC1314/LTC1315 and LT1301. The LT1301 is in

shutdown mode to conserve power until the VPP pins

require 12V. When the VPP pins require 12V, the LT1301

is activated and the LTC1314/LTC1315’s internal switches

route the VPPIN pin to the VPPOUT pin. The LT1301 is

capable of delivering 12V at 120mA maintaining high

efficiency. The LTC1314/LTC1315’s break-before-make

and slope-controlled switching will ensure that the output

voltage transition will be smooth, of moderate slope, and

without overshoot. This is critical for flash memory prod-

ucts to prevent damaging parts from overshoot and

ringing exceeding the 13.5V device limit.

With Higher Voltage Supplies Available

Often systems have an available supply voltage greater

than 12V. The LTC1314/LTC1315 can be used in conjunc-

tion with an LT1121 linear regulator to supply the PC card

socket with all necessary voltages. Figures 3 and 4 show

these circuits. The LTC1314/LTC1315 enable the LT1121

linear regulator only when 12V is required at the VPP pins.

In all other modes the LT1121 is in shutdown mode and

consumes only 16µA. The LT1121 also provides thermal

shutdown and current limiting features to protect the

socket, the card and the system regulator.

Supply Bypassing

For best results, bypass VCCIN and VPPIN at their inputs

with 1µF capacitors. VPPOUT should have a 0.01µF to 0.1µF

capacitor for noise reduction and electrostatic discharge

(ESD) damage prevention. Larger values of output capaci-

tor will create large current spikes during transitions,

requiring larger bypass capacitors on the VCCIN and VPPIN

pins.

13V TO 20V

(MAY BE FROM

AUXILLARY

WINDING)

+

10µF

5V

100k

2N7002

PCMCIA

CONTROLLER

VIN

VOUT

LT1121

SHDN

PGND

ADJ

GND

5V

VDD

SHDN

VPPIN

VPPOUT

LTC1314

EN0

EN1

DRV5

VCC0

VCCIN

VCC1

DRV3

GND

+

200pF

121k

1%

1µF

56.2k

1%

5V

Q1A

1/2 Si9956DY

+

Q2A

Si9956DY

Q2B

0.1µF

1µF

3.3V

Figure 3. LTC1314 with the LT1121 Linear Regulator

VPP1

VPP2

PC CARD

SOCKET

VCC

1314/15 F03

8

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