MIC22600_09 Datasheet, PDF (3/29 Pages) Micrel Semiconductor – 1MHz, 6A Integrated Switch Synchronous Buck Regulator

Micrel, Inc.
MIC22600
Pin Description
Pin Number
MLF-24
1, 6, 13, 18
17
2
Pin Number
TSSOP-24
3, 10, 15, 22
2
11
4
13
14
23
15
24
5
14
7, 12, 19, 24
16
3
4, 9, 16, 21
1
12
8, 9, 10, 11,
20, 21, 22, 23
EP
5, 6, 7, 8,
17, 18 19, 20
EP
Pin Name Description
PVIN
SVIN
EN/DLY
RC
FB
COMP
POR/PG
PGND
SGND
DELAY
SW
GND
Power Supply Voltage (Input): Requires bypass capacitor to GND.
Signal Power Supply Voltage (Input): Requires bypass capacitor to GND.
EN/DLY (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 voltage.
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. RC pin cannot be left floating. Use a minimum capacitor value of 220pF or
larger.
Feedback: Input to the error amplifier, connect to the external resistor divider
network to set the output voltage.
Compensation pin (Input): Place a RC network 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 (Signal): Ground
Signal Ground (Signal): 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.
Exposed Pad (Power): Must make a full connection to a GND plane for full output
power to be realized.
October 2009
3
M9999-102809-C