MIC2584/2585
Micrel
Typical Application
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
V
CC1
12V
D1
**BZX84Cxx
R1
10Ω
C1
0.47µF
R
SENSE2
0.020Ω
1
R
SENSE1
0.006Ω
1
3
2
4
Q1
Si7892DP
(PowerPAK™ SO-8)
C
LOAD1
330µF
R14
Q2
10.7kΩ
Si7892DP
1%
(PowerPAK™ SO-8)
V
OUT1
12V
6A
V
CC2
3.3V
D2
2
4
R2
10Ω
C2
0.47µF
3
C
LOAD2
330µF
C3
0.01µF
3
V
OUT2
3.3V
1.5A
R3
47kΩ
R4
22kΩ
R5
22kΩ
1
2
24
23
VCC2
SENSE2
VCC1
SENSE1
GATE2
8
R12
105kΩ
1%
ON
GATE1
OUT2
DIS2
22
5
6
7
R11
120Ω
C4
0.01µF
R15
4.42kΩ
1%
R10
560Ω
R13
14.7kΩ
1%
/FAULT
Signal
R6
130kΩ
1%
*C5
0.047µF
R8
30.9kΩ
1%
14
12
/FAULT
CDLY
MIC2585-1
FB2
FB1
OUT1
21
4
18
20
OV1
OV2
DIS1
PG1
PG2
/POR
TRK
9
19
17
16
15
R7
13kΩ
1%
DOWNSTREAM
CONTROLLER(S)
Downstream Control Signals
R9
8.06kΩ
1%
CPOR
10
GND
13
CFILTER
11
C6
0.02µF
C7
0.033µF
GND
Undervoltage (Output1) = 10.5V
Undervoltage (Output2) = 2.95V
Overvoltage (Input1) = 13.2V
Overvoltage (Input2) = 3.65V
START-UP Delay = 2.5ms
POR Delay = 10ms
Circuit Breaker Response Time = 16ms
*C5 (optional) is used to set the delay for V
OUT2
with respect to V
OUT1
V
OUT2
Delay = 9.5ms
**D1 is BZX84C18 and D2 is BZX84C8V2
Resistor tolerances are 5% unless specified otherwise.
Figure 1. Typical Application Circuit
MIC2584/2585
2
March 2005
MICREL [ MICREL SEMICONDUCTOR ]
