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參數(shù)資料
| 型號(hào)： | LP1704-222M |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 1.7MHz, 600mA Synchronous Step-Down Converter |
| 中文描述： | 為1.7MHz，600mA的同步降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 454K |
| 代理商： | LP1704-222M |
MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
MP2104 Rev. 1.3
10/4/2005
www.MonolithicPower.com
6
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2005 MPS. All Rights Reserved.
TM
PIN FUNCTIONS
Pin # Name Description
1
EN
Regulator Enable Control Input. Drive EN above 1.5V to turn on the MP2104. Drive EN below
0.3V to turn it off (shutdown current < 0.1μA).
GND Ground.
SW
Power Switch Output. Inductor connection to drains of the internal PFET and NFET switches.
IN
Supply Input. Bypass to GND with a 2.2μF or greater ceramic capacitor.
Feedback Input (MP2104DJ). Connect FB to the center point of the external resistor divider. The
feedback threshold voltage is 0.6V.
Output Voltage Sense Input (MP2104DJ-1.5 and MP2104DJ-1.8). An internal resistor divider is
connected to this pin to set the proper output voltage.
2
3
4
5
FB
5
OUT
OPERATION
The MP2104 is a constant frequency current
mode PWM step-down converter. The MP2104
is optimized for low voltage, Li-Ion battery
powered applications where high efficiency and
small size are critical. The MP2104 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 MP2104 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 T
ON
is the main switch on time, f
OSC
is
the oscillator frequency (1.7MHz), V
OUT
is the
output voltage and V
IN
is the input voltage.
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
1.7MHz
OSCILLATOR
IAMP
10X
CURRENT
SENSE
AMP
DH
DL
+
--
MAIN
SWITCH
(PCH)
SYNCHRONOUS
RECTIFIER
(NCH)
MP2104_BD01
Figure 1—Functional Block Diagram (MP2104)
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