LTC1706I-19 查看數據表（PDF） - Linear Technology

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LTC1706I-19

VID Voltage Programmer

Linear Technology 

LTC1706-19

U

OPERATIO

VID Input Characteristics

The VID inputs should be driven with a maximum VIL of

0.4V and a minimum VIH of 1.6V. However, the VID input

range is not limited to values below VCC. Because of the

diode between VCC and the pull-up resistor, the inputs can

go higher than VCC without being bootstrapped to VCC or

damaging the input. This allows the LTC1706-19 to be

logic compatible and operational over a much higher input

voltage range (less than the 7V absolute maximum rating).

When a VID input is grounded, there will be a higher

quiescent current flow from VCC because of a resistor from

VCC through a series diode to the input. This increase in

quiescent current is calculated from

N•(VCC – VDIODE)/RPULLUP.

N is the number of grounded VID inputs.

VDIODE is typically 0.6V while RPULLUP has a typical pull-up

resistance of 40kΩ. In other words, each VID input has a

typical pull-up current of (VCC – 0.6V)/40k, which is

approximately 68µA for a 3.3V system.

TYPICAL APPLICATIO S

450mA, Low Noise Monolithic Current Mode Step-Down DC/DC Converter

0.1µF

68µF

20V

2.7V TO 5.5V

VOUT

1.3V TO 2V

450mA

3

VCC

6

SENSE

L1**

100µH

0.1µF

5

FB LTC1706-19

+ COUT

820µF

4V

×2

VID

0123

GND

781 2

4

FROM µP

* MOTOROLA MBRS130LT3

** COILCRAFT D03316-104

D1*

0.1µF

1

SSW

2

NC

16

PWRVIN

PGND 15

3 BSW

4

NC

5

SGND

LTC1433

14

SVIN

13

COSC

12

POR

6

RUN/SS

7

LBO

8

LBI

11

ITH

10

VOSENSE

NC

VPROG

INPUT VOLTAGE

3.5V TO 12V

10k

POWER ON RESET

5.1k

680pF

47pF

6800pF

1706-19 TA02

6

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