MIC22400_11 Datasheet, PDF (3/28 Pages) Micrel Semiconductor – 4A Integrated Switch Synchronous Buck Regulator with Frequency Programmable up to 4MHz

Micrel, Inc.
MIC22400
Pin Description (Continued)
Pin Number
MLF-20
18
19
20
EP
Pin Number
e-TSSOP-20
1
2
3
EP
Pin Name Description
EN/DLY
DELAY
RC
GND
Enable (Input): When this pin is pulled higher than the enable threshold, the part
will start up. Below this voltage the device is in its low quiescent current mode.
The pin has a 1µA current source charging it to VDD. By adding a capacitor to this
pin a delay may easily be generated. The enable function will not operate with an
input voltage lower than the min specified.
Delay (Input): Capacitor-to-ground sets internal delay timer. Timer delays POR
output at turn-on and ramp down at turn-off.
Ramp Control: Capacitor to ground from this pin determines slew rate of output
voltage during start-up. This can be used for tracking capability as well as soft
start.
Exposed Pad (Power): Must make a full connection to a GND plane.
June 2011
3
M9999-061511-F