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
&
VOLTAGE
REFERENCE
ICS
+
SLOPE COMP
EAO1
+
IAMP
10X
--
CURRENT
SENSE
AMP
PWM
DH
MAIN
SWITCH
(PCH)
OSC
PWM
CONTROL
LOGIC
4 SW1
SYNCHRONOUS
RECTIFIER
(NCH)
DL
EN1/2 2/9
0.6V
FEEDBACK
ERROR EAMP1
AMP
--
+
+
PWMCMP
--
FB1 1
CC
17pF
1.6MHz
OSCILLATOR
5 GND
FB2 10
+
EAMP2
0.6V
--
EAO2
6
IN2
7 OUT2
FB1/2
0.66V
+
--
OUT_Hi
NO
GOOD
8 PWROK
POWER ON RESET
WINDOW
COMPARATORS
0.54V
+
--
OUT_Lo
Figure 1—MP2101 Function Diagram
MP2101 Rev. 1.0
8/18/2006
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7
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