MIC2267 Datasheet, PDF (2/19 Pages) Micrel Semiconductor – Input Current Limiting Synchronous Buck Regulator

Micrel Inc.
Ordering Information
Part Number
Voltage
Mark Code
Temperature Range
MIC2267YML
Adjustable
2267
–40°C to +125°C
Note:
1. Package is GREEN RoHS compliant. Lead finish is NiPdAu. Mold compound is halogen free.
Pin Configuration
MIC2267
Package⁽¹⁾
12-Pin 3mm x 3mm MLF^®
12-Pin 3mm x 3mm MLF^® (ML)
(Top View)
Pin Description
Pin Number
1
Pin Name
AGND
2
FB
3
COMP
4
PGOOD
5
SW
6
PGND
7
VIN
8
EN
9
FILTER
10
LIMIT
11
SLOPEC
12
FREQ
ePAD
HS Pad
Pin Function
Analog Ground: The ground return for the low power blocks of the MIC2267.
Feedback (Input): Input to the error amplifier. Connect a resistor divider between VOUT and
ground to adjust the output voltage.
Compensation Pin: Output of the internal gm error amplifier. Place a series connected,
Resistor and Capacitor to GND for external compensation.
Power Good (Output): Open drain of an N-Channel MOSFET. Connect a resistor to VIN or
VOUT for power good signalling.
Switch (Output): Internal power MOSFET output switches.
Power Ground: The ground return for the switching currents.
Power Supply Voltage (Input): Requires bypass capacitor to GND
Enable/Delay (Input): Apply a Logic High to start the device. Apply Logic Low to stop the
device; placing it in a low quiescent current mode.
Input Current Limit Filter: Place a capacitor to VIN to adjust the time constant for the input
current limit filter.
Input Current Limit: Place a resistor to ground to adjust the average current limit from the input
supply.
Slope Compensation: Sets current mode slope compensation
Frequency Control: The switching frequency is adjusted from 400kHz to 1.5MHz with a resistor
from this pin to ground.
Exposed Heatsink Pad: Thermal connection between die and external ground plane. A solid
connection to a large ground plane is required for full output power. This pad must be
connected to ground.
January 2011
2
M9999-011711-A