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D01605T-472 Datasheet(PDF) 5 Page - Monolithic Power Systems

Part # D01605T-472
Description  1MHz, 800mA Synchronous Step-Down Converter
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

D01605T-472 Datasheet(HTML) 5 Page - Monolithic Power Systems

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MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
MP2105 Rev. 1.2
www.MonolithicPower.com
5
8/19/2005
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
TM
OPERATION
The MP2105 is a constant frequency current
mode PWM step-down converter. The MP2105
is optimized for low voltage, Li-Ion battery
powered applications where high efficiency and
small size are critical. The MP2105 uses an
external resistor divider to set the output
voltage from 0.6V to 6V. The device integrates
both a main switch and a synchronous rectifier,
which provides high efficiency and eliminates
an external Schottky diode. The MP2105 can
achieve 100% duty cycle. The duty cycle D of a
step-down converter is defined as:
%
100
V
V
%
100
f
T
D
IN
OUT
OSC
ON
×
×
×
=
where TON is the main switch on time, and fOSC
is the oscillator frequency (1MHz).
IN
EN
FB
GND
SW
+
+
--
PWMCMP
PWM
OSC
+
--
EAMP
ICS
SLOPE COMP
FEEDBACK
ERROR\
AMP
0.6V
EAO
CC
17pF
BIAS
&
VOLTAGE
REFERENCE
PWM
CONTROL
LOGIC
1.0MHz
OSCILLATOR
IAMP
10X
CURRENT
SENSE
AMP
DH
DL
+
--
MAIN
SWITCH
(PCH)
SYNCHRONOUS
RECTIFIER
(NCH)
MP2105_BD01
Figure 1—Functional Block Diagram


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