
Micrel, Inc.
Pin Description
Pin
MIC2808
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14, 15
16
Pin Name
LDO1
VIN
EN2
BYP
DAC
AGND
NC
EN
AVIN
EN1
PVIN
SW
PGND
OUT
LDO2
Pin Function
Output of the LDO1.
LDO1 and LDO2 Supply Voltage. Must be connected to PIN 9 (AVIN).
Enables the LDO2 regulator. Do not leave floating.
Filter capacitor for LDO1 and LDO2 internal voltage reference. Connect a 0.1μF capacitor-to-ground.
DAC Control Input (Analog Voltage Input). Provides control of output voltage of DC/DC regulator. The
output voltage is 3x’s the DAC voltage (Ex. 0.5V DAC = 1.5V OUT ) when V IN > V OUT . Bypass mode is enabled
when the DAC voltage exceeds 1.2V or V IN ≤ V OUT .
Signal ground.
No Connect.
Enables the DC/DC Regulator. Do not leave floating.
Supply voltage for DC/DC regulator control circuitry and reference voltage circuit. Must be connected to PIN
2 (VIN).
Enables LDO1 Regulator. Do not leave floating.
Supply Voltage: Requires bypass capacitor to ground.
Switch: Internal power MOSFET output switches of DC/DC regulator.
Power ground.
Drain of internal bypass switch, also serves as feedback for the internal regulator.
Output of the LDO2.
July 2009
3
M9999-071709-A