LT1313 查看數據表（PDF） - Linear Technology

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LT1313

Dual PCMCIA VPP Driver/Regulator

Linear Technology 

LT1313

PIN FUNCTIONS

Supply Pins: Power is supplied to the device through the

two supply pins which must be connected together at all

times . The supply pins should be bypassed to ground if

the device is more than six inches away from the main

supply capacitor. A bypass capacitor in the range of 0.1µF

to 1µF is sufficient. The supply voltage to the LT1313 can

be loosely regulated between 13V and 20V.

VPPOUT Pins: Each regulated output supplies power to the

two PCMCIA card VPP pins which are typically tied to-

gether at the socket. Each VPPOUT output is current limited

to approximately 330mA. Thermal shutdown provides a

second level of protection. A 1µF to 10µF tantalum output

capacitor is recommended.

Input Enable Pins: The four digital input pins are high

impedance inputs with approximately 20µA input current

at 2.4V. The input thresholds are compatible with CMOS

controllers and can be driven from either 5V or 3.3V CMOS

logic. ESD protection diodes limit input excursions to 0.6V

below ground.

VALID Output Pins: These pins are open-collector NPN

outputs which are driven low when the corresponding

VPPOUT pin is in regulation, i.e., when it is above 11V. Two

external 51k pull-up resistors are connected between

these outputs and the same 5V or 3.3V logic supply

powering the PCMCIA compatible control logic.

VCC Sense Pins: Two independent comparators and 4V

references automatically switch the VPPOUT outputs from

5V to 3.3V depending upon the voltage sensed at the

corresponding PCMCIA card socket VCC pin. The input

current for these pins is approximately 30µA. For 5V only

operation, connect the Sense pins directly to ground. An

ESD protection diode limits the input voltage to 0.6V below

ground.

Ground Pins: The two ground pins must be connected

together at all times.

BLOCK DIAGRAM (One Channel)

VS

XVCC SENSE

+

–

4V

XEN0

XEN1

X = A OR B

LOW DROPOUT

LINEAR

REGULATOR

XVPPOUT

VOLTAGE

LOGIC CONTROL

+

–

11V

XVALID

1313 BD

5

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