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LTC2925 View Datasheet(PDF) - Linear Technology

Part Name
Description
MFG CO.
'LTC2925' PDF : 24 Pages View PDF
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LTC2925
PIN FUNCTIONS GN/UF Packages
SCTMR (Pin 24/Pin 21): Circuit Breaker Timer. A capacitor
from SCTMR to GND programs the maximum time that a
short circuit can be sustained before GATE is pulled low.
When (SENSEP – SENSEN) > 50mV, SCTMR will pull up
with 50μA, otherwise it pulls down with 2μA. When the
voltage at SCTMR exceeds 1.23V, the GATE will be pulled
to ground with 20mA and the FAULT pin will be pulled low.
The circuit breaker function is reset by pulling ON below
0.4V. The GATE pin will not rise again until SCTMR has
been pulled below 100mV by the 2μA current source. If
FAULT is tied back to ON the system will automatically
retry after a fault. Tie SCTMR to GND if the circuit breaker
is not used.
BLOCK DIAGRAM Pin numbers in parentheses are for the UF package.
(22)
1
VCC
VCC
TRACK3
(9) 12
TRACK2
(11) 14
TRACK1
(12) 15
SCTMR
(21) 24
+
1.2V
PGI
(19) 22
VCC
10μA
PGTMR
(20) 23
1.2V
+
ONSIG
ON
(1) 4
SCTMR
0.1V +
+
0.4V
+
1.2V
RAMPBUF
(6) 9
REMOTE
(14) 17
STATUS
(18) 21
0.8V
VCC
50μA
2μA
SQ
R
SQ
R
+
0.1V
VCC
2.6V +
FB3
11 (8)
FB2
13 (10)
FB1
16 (13)
SENSEP > SENSEN + 50mV
50mV
SENSEP
2 (23)
SENSEN
3 (24)
FAULT
20 (17)
CHARGE
PUMP
10μA
10μA
VCC
10μA
GATE
19 (16)
1.2V
SDTMR
5 (2)
SDx
RAMP
18 (15)
VCC
GND
10
(7, 25)
4.9V
GATE
GATE > RAMP + 4.9V
2925 FBD
2925fc
7
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