MIC2580A
Micrel, Inc.
Ordering Information
Standard
Part Number
Pb-Free
MIC2580A-1.0YTS
MIC2580A-1.6YTS
Precharge
Voltage
1V
1.6V
Temperature
Range
–40°C to +85°C
–40°C to +85°C
Package
24-lead TSSOP
24-lead TSSOP
MIC2580A-1.0BTS
MIC2580A-1.6BTS
Pin Configuration
12VOUT 1
3VGATE 2
3VOUT 3
3VSENSE 4
3VIN 5
/PCIRST 6
/LPCIRST 7
/EPWRGD 8
/PWRGD 9
VPCHG 10
GND 11
M12VIN 12
24 12VIN
23 5VGATE
22 5VOUT
21 5VSENSE
20 5VIN
19 /FAULT
18 CSTART
17 CSLEW
16 /POR
15 CRST
14 /ON
13 M12VOUT
24-lead TSSOP (TS)
Pin Description
Pin Number
1
2
Pin Name
12VOUT
3VGATE
Pin Function
+12V Switched Supply (Output): Load carrying output.
3.3V Gate Drive (Output): Drives gate of external N-channel MOSFET +3V
switch. Adding capacitance will slow the slew rate of the external MOSFET
switch turn-on. (The external MOSFET’s gate is charged by an internal
current source.)
+3.3V Output Voltage Sense (Input): Connect to source of external
N-channel MOSFET (+3V switched output) to monitor for output undervolt-
age conditions.
+3.3V Current Sense (Input): Measures voltage drop across an external
sense resistor with respect to 3VIN for overcurrent detection through the
+3.3V switch.
3V Supply (Input): +3.3V-supply input for current monitoring (reference input
for 3VSENSE). Not a load-current carrying input.
PCI-Bus Reset (Input): Input from PCI bus that resets the internal logic.
3
3VOUT
4
3VSENSE
5
6
3VIN
/PCIRST
MIC2580A
2
February 2005
MICREL [ MICREL SEMICONDUCTOR ]
