MCP1640 SYNCHRONOUS BOOST
CONVERTER EVALUATION BOARD
USER ’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP1640 is a compact, high-efficiency, fixed frequency, synchronous step-up
dc-dc converter. It provides an easy-to-use power supply solution for applications
powered by one-cell, two-cell, or three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or
Li-Polymer batteries in addition to distributed 3.3V to 5.0V applications.
The MCP1640 is capable of regulating the output voltage over a wide 2.0V to 5.5V
range and typically can deliver over 100 mA of load current at 3.3V output when
supplied from a single 1.2V cell. The input voltage range is 0.35V to 5.5V with a low
0.65V start-up voltage. The regulated output voltage, V OUT should be greater than or
equal to the input voltage, V IN . Additional device features are: automatic PWM / PFM
transition to optimize efficiency, low device quiescent current (20 μA in PFM mode and
1 μA in stand-by mode), multiple and selectable, logic controlled shutdown states (true
load disconnect or “bypass”, output connected to input), low noise and discontinuous
current anti-ring control.
V IN
+
1
1
+ V OUT
GND _
1
1
_
GND
L 1
4,7 μH
P1
U1
3.3V
2.0V
P1
SW
EN
EN Switch
1
2 GND
3
V IN
V OUT
FB
6
5
4
V OUT SEL
C 2
10 μF
C 1
10 μF
MCP1640
SOT-23-6
Note: Calculate RT resistors
for a particular V OUT as:
RB 1
309 k ?
P1
S1
P1
RT = RB * ((V OUT / V FB ) -1)
S1
P1
V FB = 1.21V
FIGURE 2-1:
MCP1640 Synchronous Boost SOT-23-6 Application.
Two enable mode options are available: true disconnect and bypass. When disabled,
the true disconnect option removes the normal boost topology path from input to output
by opening the diode path using a P-Channel synchronous switch with a reversible
body diode. The bypass option uses the synchronous boost converter P-Channel
switch to connect the input to the output through the boost inductor while disabled
providing voltage to the load, while consuming less than 1 μA of current from V IN .
The MCP1640 is available in SOT-23-6 and 2x3 mm DFN-8 lead packages.
? 2010 Microchip Technology Inc.
DS51880A-page 11
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相关代理商/技术参数
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MCP1640T-I/CH 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:0.65V Start-up Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option
MCP1640T-I/CHY 功能描述:直流/直流开关转换器 500 kHz 300 mA Syn. PWM/PFM enabled RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
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