Micrel, Inc.
MIC4720
Pin Description
Pin Number
®
MLF
1,12
2,11
Pin Number
MSOP
1, 10
2, 9
Pin Name
SW
VIN
Pin Function
Switch (Output): Internal power P-Channel MOSFET output switch
Supply Voltage (Input): Supply voltage for the source of the internal P-channel
MOSFET and driver.
Requires bypass capacitor to GND.
3,10
4
5
6
7
8
9
EP
8
3
4
5
—
6
7
—
PGND
SGND
BIAS
FB
NC
EN
PGOOD
GND
Power Ground. Provides the ground return path for the high-side drive current.
Signal (Analog) Ground. Provides return path for control circuitry and internal
reference.
Internal circuit bias supply. Must be bypassed with a 0.1µF ceramic capacitor to
SGND.
Feedback. Input to the error amplifier, connect to the external resistor divider
network to set the output voltage.
No Connect. Not internally connected to die. This pin can be tied to any other pin
if desired.
Enable (Input). Logic level low, will shutdown the device, reducing the current
draw to less than 5µA.
Power Good. Open drain output that is pulled to ground when the output voltage
is within +/- 7.5% of the set regulation voltage
Connect to ground.
May 2007
3
M9999-051707
MICREL [ MICREL SEMICONDUCTOR ]
