LTC1647-3_15 Datasheet, PDF (19/22 Pages) Linear Technology – Dual Hot Swap Controllers

LTC1647-1/
LTC1647-2/LTC1647-3
APPLICATIONS INFORMATION
3.3V V_ID
SUPPLY
R1
0.1Ω
Q1
1/2 MMDF3N02HD
ON1
FAULT1
DEVICE BAY
CONTROLLER
WITH 1394 PHY
AND/OR USB
ON2
FAULT2
R5
10Ω
C3
0.1μF
R6
10Ω
C6
0.1μF
R7
0.1Ω
R2
10Ω
8
6
1
SENSE1 GATE1
2
V_CC
ON1/FAULT1
3 _ON2/FAULT2
LTC1647-2
4
GND
SENSE2 GATE2
7
5
R8
10Ω
Q2
1/2 MMDF3N02HD
R3**
DEVICE #1
+
1394 PHY
C_LOAD* R4** _AND/OR
USB PORT
C1
10nF
* C_LOAD IS USER-SELECTED BASED
ON THE DEVICE REQUIREMENTS
** R3, R4, R7 AND R8 ARE OPTIONAL DISCHARGE
RESISTORS WHEN DEVICES ARE POWERED-OFF
Q1, Q2: ON SEMICONDUCTOR
C4
10nF
R9**
DEVICE #2
+
1394 PHY
C_LOAD* R10** _AND/OR
USB PORT
V_ID
V_LKO
V_LKO – V_LKH
V_ON1
t4
FAULT 1 WAVEFORM SHOWN WITH C3
V_FAULT1
V_{IH VIL}
t5
V_IH
V_R1
V_GATE1
t1
t2 t3
V_ON2
t9 t10
FAULT 2 WAVEFORM SHOWN WITHOUT C6
V_FAULT2
t7
V_R7
t8
t6
t11
V_GATE2
1647-1/2/3 F13
Figure 13. V_ID Power Controller with Fault Status and Retry Sequence
1647fa
19