LTC3704 View Datasheet(PDF) - Linear Technology

Part Name

Description

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LTC3704

Wide Input Range, No RSENSE™ Positive-to-Negative DC/DC Controller

Linear Technology 

LTC3704

APPLICATIO S I FOR ATIO

The resistor R1 is typically chosen to be less than 1M.

For applications where the RUN pin is only to be used as

a logic input, the user should be aware of the 7V

Absolute Maximum Rating for this pin! The RUN pin can

be connected to the input voltage through an external 1M

resistor, as shown in Figure 8c, for “always on” operation.

12

+

R2

INPUT

SUPPLY OPTIONAL

FILTER

R1

CAPACITOR

–

VIN

RUN

+

6V

–

RUN

COMPARATOR

BIAS AND

START-UP

CONTROL

1.248V

μPOWER

REFERENCE

GND

3704 F08a

Figure 8a. Programming the Turn-On and Turn-Off Thresholds Using the RUN Pin

RUN

EXTERNAL

LOGIC CONTROL

6V

1.248V

RUN

COMPARATOR

+

–

3704 F08b

Figure 8b. On/Off Control Using External Logic

+

R2

1M

INPUT

SUPPLY

VIN

RUN

+

6V

–

RUN

COMPARATOR

–

GND 1.248V

3704 F08c

Figure 8c. External Pull-Up Resistor On

RUN Pin for “Always On” Operation

3704fb

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