- 您现在的位置：买卖IC网 > PDF目录20430 > MCP1640EV-SBC (Microchip Technology)BOARD EVAL FOR MCP1640 PDF资料下载
参数资料
| 型号： | MCP1640EV-SBC |
| 厂商： | Microchip Technology |
| 文件页数： | 12/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MCP1640 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步升 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 2V，3.3V 或 5V |
| 电流 - 输出： | 100mA，350mA |
| 输入电压： | 0.35 ~ 5.5V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP1640 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
MCP1640/B/C/D
4.2
Functional Description
The MCP1640/B/C/D is a compact, high-efficiency,
fixed frequency, step-up DC-DC converter that
provides an easy-to-use power supply solution for
applications powered by either one-cell, two-cell, or
three-cell alkaline, NiCd, or NiMH, or one-cell Li-Ion or
Li-Polymer batteries.
VOUT
MCP1640/B/C/D.
VIN
INTERNAL
BIAS
DIRECTION
CONTROL
I ZERO
SW
EN
GATE DRIVE
AND
SHUTDOWN
CONTROL
.3V
0V
SOFT-START
I LIMIT
LOGIC
I SENSE
GND
OSCILLATOR
SLOPE
COMP.
S
PWM/PFM
LOGIC
1.21V
FB
EA
FIGURE 4-1:
MCP1640/B/C/D Block Diagram.
4.2.1
LOW-VOLTAGE START-UP
50% of its nominal value. Once the output voltage
The MCP1640/B/C/D is capable of starting from a low
input voltage. Start-up voltage is typically 0.65V for a
3.3V output and 1 mA resistive load.
When enabled, the internal start-up logic turns the
rectifying P-Channel switch on until the output
capacitor is charged to a value close to the input
voltage. The rectifying switch is current-limited during
this time. After charging the output capacitor to the
input voltage, the device starts switching. If the input
voltage is below 1.6V, the device runs open-loop with a
fixed duty cycle of 70% until the output reaches 1.6V.
During this time, the boost switch current is limited to
DS22234B-page 12
reaches 1.6V, normal closed-loop PWM operation is
initiated.
The MCP1640/B/C/D charges an internal capacitor
with a very weak current source. The voltage on this
capacitor, in turn, slowly ramps the current limit of the
boost switch to its nominal value. The soft-start
capacitor is completely discharged in the event of a
commanded shutdown or a thermal shutdown.
There is no undervoltage lockout feature for the
MCP1640/B/C/D. The device will start up at the lowest
possible voltage and run down to the lowest possible
voltage. For typical battery applications, this may result
in “motor-boating” (emitting a low-frequency tone) for
deeply discharged batteries.
? 2011 Microchip Technology Inc.
相关PDF资料 |
PDF描述 |
|---|---|
| RS-483.3SZ/H3 | CONV DC/DC 2W 18-72VIN 3.3VOUT |
| EMA06DTBD | CONN EDGECARD 12POS R/A .125 SLD |
| 17PM-K053-00VS | MOTOR STEP UNI 42MM SQ 24V |
| EBA15DRMN | CONN EDGECARD 30POS .125 SQ WW |
| MLG1005SR22J | INDUCTOR MULTILAYER 220NH 0402 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP1640-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 |
| MCP1640-I/MC | 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 |
| MCP1640-I/MC | 制造商:Microchip Technology Inc 功能描述:BOOST DC/DC REGULATOR IC |
| MCP1640-ICH | 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 |
| MCP1640-IMC | 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 |
发布紧急采购，3分钟左右您将得到回复。