MIC2544/2548
Micrel
Ordering Information
Part Number
MIC2544-1BM
MIC2544-1BMM
MIC2544-2BM
MIC2544-2BMM
MIC2548-1BM
MIC2548-1BMM
MIC2548-2BM
MIC2548-2BMM
Enable
Active High
Active High
Active Low
Active Low
Active High
Active High
Active Low
Active Low
•
•
•
•
Latch*
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
8-pin SOP
8-pin MSOP
8-pin SOP
8-pin MSOP
8-pin SOP
8-pin MSOP
8-pin SOP
8-pin MSOP
* Thermal Shutdown Latch
Pin Configuration
MIC2544/2548
EN
FLG
GND
ILIM
1
2
3
4
8
7
6
5
OUT
IN
OUT
NC
EN
FLG
GND
NC
1
2
3
4
MIC2544/2548
8
7
6
5
OUT
IN
OUT
ILIM
8-Pin SOP (M)
MIC2544/2548
(OUT)
(EN)
(FLG)
LOGIC,
CHARGE
PUMP
8-Pin MSOP (MM)
NOTE: PINS 4 AND 5
FOR SOIC AND MSOP
ARE DIFFERENT.
(IN)
(ILIM)
(GND)
Pin Description
Pin Number
MSOP-8
1
Pin Number
SOP-8
1
Pin Name
EN
Pin Function
Enable (Input): Logic-compatible enable input. Active-high (-1) or active-low
(-2). High input >1.7V typical; low input <1.5V typical. Do not float.
MIC2548 only: Also resets thermal shutdown latch.
Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent or
thermal shutdown conditions.
MIC2548 only: latched low on thermal shutdown.
Ground
Current Limit: Sets current-limit threshold using an external resistor, R
SET
,
connected to ground. 154Ω < R
SET
< 2.29kΩ.
Input: Output MOSFET drain. Also powers internal circuitry.
Switch (Output): Output MOSFET source. Pins 6 and 8 must be externally
connected.
Not internally connected
2
2
FLG
3
5
7
6,8
4
3
4
7
6,8
5
GND
ILIM
IN
OUT
NC
MIC2544/2548
2
June 2000
MICREL [ MICREL SEMICONDUCTOR ]
