MIC2111B Datasheet, PDF (3/35 Pages) Micrel Semiconductor – High-Performance, Multi-Mode, Step-Down Controller

Micrel, Inc.
Ordering Information
Part Number
Switching
Frequency
Junction
Temperature
Range
MIC2111BYMT 200kHz to 2MHz −40°C to +125°C
Current-Sense
Gain
30V/V
Pin Configuration
Power
Stage
DrMOS
MIC2111B
Package
20-Pin
3mm × 3mm TQFN
Lead
Finish
Pb-Free
20-Pin 3mm × 3mm TQFN (MT)
(Top View)
Pin Description
Pin Number I/O Pin Name Pin Name
Valley Current Mode: Slope compensation can be adjusted by adding a resistor from this pin to
1
I
SLOPE ^{VIN (input power supply).}
Voltage Mode: Artificial ramp controlled by SLOPE resistor
2
I
EN
Enable (Input): A logic signal to enable or disable the controller. The EN pin is CMOS
compatible. Logic high = enable, logic low = disable or shutdown. Do not leave floating.
3
I
SEL
Control-Mode Selection Pin: Connect this pin to AGND for valley current-mode operation.
Leave this pin open for voltage mode control operation.
4
I
OVP
Output OVP programming pin. Connect a resistive divider to set OVP.OVP pin has 0.6V
reference (see Functional Description for more details).
5
I
FREQ
Switching Frequency Adjust (Input): Connect a resistor from this pin to GND to set the
switching frequency.
6
I
TJ
Power Module Temperature Sense Pin. Connect resistor divider to program TJ. TJ comparator
has 0.6V reference (see Functional Description for more details).
7
O
PG
Power Good (Output): Open drain output, an external resistor to VOUT is required for pull-up.
8
I
SS
Soft-start pin for limiting inrush current. A resistor from this pin to ground sets the soft-start
time. If enabled, soft-stop time is same as soft-start. Contact factory for soft stop.
October 13, 2015
3
Revision 2.1