Micrel, Inc.
MIC2808
Pin Description
Pin
Number
1
2
3
4
5
Pin Name
LDO1
VIN
EN2
BYP
DAC
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.
6
7
8
9
10
11
12
13
14, 15
16
AGND
NC
EN
AVIN
EN1
PVIN
SW
PGND
OUT
LDO2
July 2009
3
M9999-071709-A
MICREL [ MICREL SEMICONDUCTOR ]
