- 您现在的位置：买卖IC网 > PDF目录13132 > MCP1624-I/MC (Microchip Technology)IC BOOST REG PWM/PFM 8DFN PDF资料下载
参数资料
| 型号： | MCP1624-I/MC |
| 厂商： | Microchip Technology |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC BOOST REG PWM/PFM 8DFN |
| 标准包装： | 150 |
| 应用： | 转换器，PIC? 微控制器 |
| 输入电压： | 0.8 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 2 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（2x3） |
| 包装： | 管件 |
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页当前第11页第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
MCP1623/24
4.2
Functional Description
During this time, the boost switch current is limited to
The MCP1623/24 is a compact, high-efficiency, fixed
frequency, step-up DC-DC converter that provides an
easy-to-use power supply solution for PIC
microcontroller applications powered by either one-cell,
two-cell, or three-cell alkaline, NiCd, or NiMH, or one-
cell Li-Ion or Li-Polymer batteries.
Figure 4-1 depicts the functional block diagram of the
MCP1623/24.
50% of its nominal value. Once the output voltage
reaches 1.6V, normal closed-loop PWM operation is
initiated.
The MCP1623/24 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.
4.2.1
LOW-VOLTAGE START-UP
There is no undervoltage lockout feature for the
The MCP1623/24 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.
VOUT
MCP1623/24. 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” for deeply discharged batteries.
VIN
SW
EN
INTERNAL
BIAS
GATE DRIVE
AND
SHUTDOWN
CONTROL
LOGIC
DIRECTION
CONTROL
SOFT-START
.3V
0V
I ZERO
I LIMIT
I SENSE
GND
OSCILLATOR
SLOPE
COMP.
Σ
PWM/PFM
LOGIC
1.21V
FB
EA
FIGURE 4-1:
MCP1623/24 Block Diagram.
? 2011 Microchip Technology Inc.
DS41420C-page 11
相关PDF资料 |
PDF描述 |
|---|---|
| UUR1V151MNL1GS | CAP ALUM 150UF 35V 20% SMD |
| RCB64DHNN | CONN EDGECARD 128PS DIP .050 SLD |
| VE-J60-CX | CONVERTER MOD DC/DC 5V 75W |
| VE-B3W-EY-F1 | CONVERTER MOD DC/DC 5.5V 50W |
| 1945-14J | COIL RF 33UH MOLDED UNSHIELDED |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP1624T-I/CH | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low-Voltage Input Boost Regulator for PIC? Microcontrollers |
| MCP1624T-I/CHY | 功能描述:开关变换器、稳压器与控制器 500kHz 150mA Syn Bst Output Disconnect RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MCP1624T-I/MC | 功能描述:开关变换器、稳压器与控制器 500kHz 150mA Syn Bst Output Disconn & PWM RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MCP16251 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low Quiescent Current, PFM/PWM Synchronous Boost Regulator |
| MCP16251T-I/CH | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
发布紧急采购，3分钟左右您将得到回复。