MIC2285A Datasheet, PDF (2/14 Pages) Micrel Semiconductor – 8MHz PWM Synchronous Buck Regulator with LDO Standby Mode

Micrel, Inc.
MIC2285A
Ordering Information
Part Number
MIC2285AYMT
Marking
WPA
Output
Voltage*
Adj.
Junction
Temperature Range
–40° to +125°C
Package
10-Pin 2x2 Thin MLF^®
Note
* For other voltage options available, please contact Micrel Marketing for details.
MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Lead Finish
Pb-free
Pin Configuration
AGND 1
LDO 2
BIAS 3
AVIN 4
FB 5
10 PGND
9 SW
8 VIN
7 LOWQ
6 EN
10-Pin 2mm x 2mm Thin MLF^® (MT)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
Pin Name
AGND
LDO
BIAS
AVIN
FB
EN
_____
LOWQ
VIN
SW
PGND
Pin Function
Analog (signal) Ground.
LDO Output (Output): Connect to V_OUT for LDO mode operation.
Internal circuit bias supply. Must be decoupled to signal ground with a 0.1µF
capacitor and should not be loaded.
Analog Supply Voltage (Input): Supply voltage for the analog control circuitry
and LDO input power. Requires bypass capacitor to GND.
Feedback. Input to the error amplifier. For the Adjustable option, connect to the
external resistor divider network to set the output voltage. For fixed output
voltage options, connect to V_OUT and an internal resistor network sets the output
voltage.
Enable (Input). Logic low will shut down the device, reducing the quiescent
current to less than 5µA.
Enable LDO Mode (Input): Logic low enables the internal LDO and disables the
PWM operation. Logic high enables the PWM mode and disables the LDO
mode.
Supply Voltage (Input): Supply voltage for the internal switches and drivers.
Switch (Output): Internal power MOSFET output switches.
Power Ground.
August 2007
2
M9999-083107-B