MIC22700 Datasheet, PDF (2/21 Pages) Micrel Semiconductor – 1MHz, 7A Integrated Switch High Efficiency Synchronous Buck Regulator

Micrel, Inc.
MIC22700
Ordering Information
Part Number
Voltage Junction Temp. Range
Package
Lead Finish
MIC22700YML
Adj.
–40° to +125°C
24-Pin 4x4 MLF^®
Pb-Free
Note: MLF^® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
PVIN
PVIN
EN
SVIN
DELAY
SGND
EP
RC
COMP
POR/PG
FB
PVIN
PVIN
24-Pin 4mm x 4mm MLF^® (ML)
Pin Description
Pin Number
1, 6, 13, 18
17
2
4
14
15
5
7, 12, 19, 24
16
3
8, 9, 10, 11,
20, 21, 22, 23
EP
Pin Name
PVIN
SVIN
EN
RC
FB
COMP
POR/PG
PGND
SGND
DELAY
SW
Description
Power Supply Voltage (Input): Requires bypass capacitor to GND.
Signal Power Supply Voltage (Input): Requires bypass capacitor-to-GND.
Enable/Delay (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 VIN. 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.
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.
Feedback: Input to the error amplifier, connect to the external resistor divider
network to set the output voltage.
Compensation pin (Input): Place a RC to GND to compensate the device, see
applications section.
Power On Reset (Output): Open-drain output device indicates when the output is
out of regulation and is active after the delay set by the delay pin.
Power Ground: Ground
Signal Ground: Ground
Delay (Input): Capacitor to ground sets internal delay timer. Timer delays power-
on reset (POR) output at turn-on and ramp down at turn-off.
Switch (Output): Internal power MOSFET output switches.
GND
Exposed Pad (Power): Must make a full connection to a GND plane for full output
power to be realized.
July 2009
2
M9999-072209-B