MIC22950 Datasheet, PDF (2/22 Pages) Micrel Semiconductor – 10A Integrated Switch Synchronous Buck Regulator with Frequency Programmable to 2MHz

Micrel, Inc.
Ordering Information
Part Number
MIC22950YML
Nominal Output Voltage
Adjustable
Temperature Range
−40° to +125°C
Package
32-Pin 5mm x 5mm MLF^®
Note:
MLF^® is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
MIC22950
Lead Finish
Lead Free
Pin Description
Pin Number
1,2,7,8,17,23,24
Pin Name
PVIN
3
EN/DLY
4
DELAY
5
RC
6
9,10,15,16,25,26,
31,32
11,12,13,14,27,
28,29,30
18
19
20
21
22
EP
POR/PG
PGND
SW
SGND
CF
FB
COMP
SVIN
GND
32-Pin 5mm x 5mm MLF^® (ML)
Pin Function
Power Supply Voltage (Input): Requires bypass capacitor to PGND.
Enable/ delay (Input): This pin has a 1.24V band gap reference. When the pin is pulled higher
that this the part will start up. Below this voltage the device is in its low quiescent current mode.
The pin has a 1µA current source pull-up to VIN. By adding a capacitor to this pin, a delay may
be generated. The enable function will not operate with an input voltage lower than UVLO.
Delay (Input): A capacitor sets the internal delay timer. Timer delays power-on reset (POR) at
power-up and power-down.
Ramp Control (Input): 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 120pF or larger.
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 (Power): Power Ground.
Switch (Output): Internal power MOSFET output switches.
Signal Ground (Signal): Signal Ground.
Frequency Set (Input): Adjustable Frequency with external capacitor.
Feedback (Input): Input to the error amplifier, connect to the external resistor divider network to
set the output voltage.
Compensation pin (Input): Place a RC-to-SGND to compensate the device, see applications
section.
Signal Power Supply Voltage (Input): Requires bypass capacitor-to-SGND.
Center Tab (Power): Must make a full connection to a GND plane for full output power to be
realized.
February 2010
2
M9999-021910-B