TM
MP2101 – 1.6MHz SYNCHRONOUS STEP-DOWN PLUS 200mA LDO
OPERATION
The MP2101 is a fixed-frequency 1.6MHz,
800mA current mode PWM step-down switcher
with a 200mA low dropout (LDO) linear
regulator. The MP2101 is optimized for low
voltage, Li-Ion battery powered applications
where high efficiency and small size are critical.
The MP2101 uses an external resistor divider to
set both the switcher and LDO output voltage
from 0.6V to 6V.
IN1
3
+
BIAS
&
IAMP
10X
EN1/2
2/9
VOLTAGE
REFERENCE
--
CURRENT
SENSE
AMP
ICS
SLOPE COMP
EAO1
0.6V
+
+
--
PWM
OSC
DH
+
PWMCMP
FEEDBACK
MAIN
ERROR EAMP1
SWITCH
(PCH)
AMP
FB1
--
1
PWM
CONTROL
LOGIC
4
SW1
SYNCHRONOUS
RECTIFIER
(NCH)
1.6MHz
CC
17pF
OSCILLATOR
DL
5
6
GND
IN2
+
FB2
10
EAO2
EAMP2
--
0.6V
7
8
OUT2
FB1/2
+
--
OUT_Hi
PWROK
0.66V
0.54V
NO
GOOD
POWER ON RESET
WINDOW
COMPARATORS
+
--
OUT_Lo
Figure 1—MP2101 Function Diagram
MP2101 Rev. 1.0
8/18/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
7
MPS [ MONOLITHIC POWER SYSTEMS ]
