Micrel, Inc.
MIC2544A/2548A
Pin Configuration
8-pin SOIC
8-Pin MSOP (MM)
Note:
1.
Pins 4 and 5 for SOIC and MSOP are different.
Pin Description
Pin Number
MSOP-8
1
Pin Number
SOIC-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.
MIC2548A only: Also resets thermal shutdown latch.
Fault Flag (Output): Active-low, open-drain output. Indicates over current
or thermal shutdown conditions. MIC2548A only: latched low on thermal
shutdown.
Ground.
Current Limit: Sets current-limit threshold using an external resistor, R
SET
1
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
3
5
7
6,8
4
2
3
4
7
6,8
5
FLG
GND
ILIM
IN
OUT
NC
April 2010
3
M9999-043010
MICREL [ MICREL SEMICONDUCTOR ]
