TM
MP2000 – LOW INPUT VOLTAGE, 150mA LINEAR REGULATOR
OPERATION
The MP2000 is a low-current, low-voltage,
low-dropout linear regulator. It is intended for
use in devices that require very low voltage and
low quiescent current power such as wireless
modems, pagers and cellular phones.
The MP2000 uses a PNP pass element and
features internal thermal shutdown and an
internal current limit circuit.
EXTERNAL
RESISTOR
DIVIDER
V
IN
1
5
R1
+
--
4
BANDGAP
REFERENCE
V
FB
R2
C
OUT
C
BYP
V
OUT
V
EN
3
2
MP2000_F01_BD02
Figure 1—Adjustable Regulator
APPLICATION INFORMATION
Setting the Output Voltage
The output voltage can be adjusted by
changing the values of the external resistor
divider.
Use the following equation to determine these
values:
R1
⎞
⎛
V
OUT
=
0.5 V
× ⎜
1
+
⎟
R2
⎠
⎝
Typically R1 + R2 are recommended to be less
than 100kΩ.
In Figure 2, C2 is added for improved transient
response.
TYPICAL APPLICATION CIRCUIT - ADJUSTABLE
V
IN
1.35V to 6.0V
1
IN
OUT
5
OUTPUT
1.2V
MP2000-ADJ
V
IN
3
EN
GND
2
FB
4
C2
100nF
MP2000_F02_TAC01
Figure 2—Typical Application Circuit with V
OUT
= 1.2V
MP2000 Rev. 0.92
3/2/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
5
MPS [ MONOLITHIC POWER SYSTEMS ]
