LTC2926IGN datasheet(12/28 Pages) LINER

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LTC2926

2926fa

0.8V

2926 F06

FB1

RAMPBUF

TRACK1

GND

VCC

0.8V

VCC

VCC + 4.9V

SGATE2

µA

CHARGE

PUMP

RSGATE

REMOTE SENSE SWITCH

µA

CHARGE

PUMP

SGATE1

–

VCC + 4.9V

SGATE1

–

RAMP + 4.9V

MGATE

–

µA

CHARGE

PUMP

1.23V

–

ON/OFF

MGATE

CMGATE

RAMP

OUT

SUPPLY MODULE

SENSE

RX1

OUT

SUPPLY MODULE

MASTER

SLAVE1

RFB1

RFA1

RTB1

RTA1

Figure 6. Simpliﬁed Functional Block Diagram

Optional Master Supply MOSFET

Figure 7 illustrates how an optional external N-channel

MOSFET (device Q0) can ramp up a supply that doubles as

the master signal. The MOSFET’s gate is tied to the MGATE

pin and its source is tied to the RAMP pin. The MGATE pin

sources or sinks 10µA to ramp the MOSFET’s gate up or

down at a rate set by the external capacitor connected to

the MGATE pin. The series MOSFET controls any supply

with an output voltage between 0V and VCC.

To compensate for voltage drop across the master supply

MOSFET, add an optional external remote sense switch

(device Q3 in Figure 7) connected between RAMP and the

sense input of the master voltage supply module. Tie the

gate of the external switch MOSFET to the RSGATE pin

for automatic remote sense switching.

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