MIC2811_08 Datasheet, PDF (3/17 Pages) Micrel Semiconductor – Digital Power Management IC 2MHz, 600mA DC/DC with Triple 300mA LDOs

Micrel, Inc.
Pin Configuration
EN1
BIAS
SGND
PGND
VIN1
LDO1
VIN
LDO3
EN1
BIAS
SGND
PGND
MIC2811/2821
VIN1
LDO1
VIN
LDO3
MIC2811
16-Pin 3mm x 3mm MLF^® (ML)
(Top View)
MIC2821
16-Pin 3mm x 3mm MLF^® (ML)
(Top View)
Pin Description
Pin Number
MIC2811
1
2
3
4
5
6
7
8
9
10
11
12
13
14
N/A
15
N/A
16
Pin Number
MIC2821
1
2
3
4
5
6
7
8
9
10
11
12
13
N/A
14
N/A
15
16
Pin Name
EN1
BIAS
SGND
PGND
SW
DVIN
VIN2
LDO2
LDO3
VIN
LDO1
VIN1
FB
BYP
EN3
EN
EN
EN2
Pin Name
Enable Input (LDO 1). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
Internal circuit bias supply. It must be de-coupled to signal ground with a
0.1µF capacitor and should not be loaded.
Signal ground.
Power ground.
Switch (Output): Internal power MOSFET output switches.
Power Supply for DC/DC converter. Must be tied to VIN.
Power Supply to LDO2.
Output of LDO2.
Output of LDO3.
Supply to bias circuitry and power to LDO3, must be tied to DVIN.
Output of LDO1.
Power Supply to LDO1.
Feedback input to the error amplifier of the DC/DC converter.
Adjust version: Use external resistor divider from DC/DC output to set VOUT.
Fixed voltage version: Connect directly to VOUT of the DC/DC converter.
Reference Bypass. Connect external 0.1µF to GND to reduce output noise.
May be left open. Do not connect directly to GND.
Enable Input (LDO3). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
Enable Input (DC/DC and LDO3). Active High Input. Logic High = On; Logic
Low = Off; Do not leave floating.
Enable Input (DC/DC). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
Enable Input (LDO2). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
April 2008
3
M9999-042208-A