MP2105 데이터 시트보기 (PDF) - Monolithic Power Systems
부품명
상세내역
제조사
MP2105 Datasheet PDF : 8 Pages
| |||
TM
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
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
IN
an external Schottky diode. The MP2105 can
achieve 100% duty cycle. The duty cycle D of a
step-down converter is defined as:
D
=
TON
× fOSC
× 100%
≈
VOUT
VIN
× 100%
where TON is the main switch on time, and fOSC
is the oscillator frequency (1MHz).
BIAS
EN
&
VOLTAGE
REFERENCE
0.6V
ICS +
+
SLOPE COMP
PWM
+PWMCMP
FEEDBACK
ERROR\ EAMP
EAO --
AMP
FB
--
+
IAMP
10X
CURRENT --
SENSE
AMP
DH
MAIN
SWITCH
(PCH)
CC
17pF
1.0MHz OSC
OSCILLATOR
PWM
CONTROL
LOGIC
SW
SYNCHRONOUS
RECTIFIER
(NCH)
DL
Figure 1—Functional Block Diagram
GND
MP2105_BD01
MP2105 Rev. 1.3
www.MonolithicPower.com
5
5/11/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
Share Link: 