LTC2926CGN View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2926CGN' PDF : 28 Pages View PDF
LTC2926
APPLICATIO S I FOR ATIO
SUPPLY MODULE
OUT
Q0
MASTER
SUPPLY MODULE
OUT
RX1
SENSE
ON/OFF
D1
MGATE +
RAMP + 4.9V –
SGATE1 +
VCC + 4.9V –
SGATE2 +
VCC + 4.9V –
ON
+
1.23V –
RAMPBUF
1x
0.8V +
RTB1
RTA1
–
TRACK1
CMGATE
Q1
SLAVE1
VCC
MGATE
RAMP
REMOTE SENSE SWITCH
S1
CHARGE
PUMP
10µA
10µA
TO
RSGATE
PIN
CHARGE
PUMP
10µA
10µA
VCC
CHARGE
PUMP
0.8V +
10µA
–
10µA
GND
SGATE1
FB1
2926 F06
RFB1
RFA1
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
12
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.
2926fa
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