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| 型号： | MCP1624T-I/MC |
| 厂商： | Microchip Technology |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | IC BOOST SYNC REG PWM/PFM 8DFN |
| 标准包装： | 3,300 |
| 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： | 带卷 (TR) |
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MCP1623/24
4.0
DETAILED DESCRIPTION
4.1.2
PWM MODE ONLY OPTION
The MCP1623 devices disable PFM mode switching,
4.1
Device Option Overview
and operate only in PWM mode over the entire load
The MCP1623/24 family of devices is capable of low
start-up voltage and delivers high efficiency over a wide
load range for single cell, two cell, three cell alkaline,
NiMH, NiCd and single cell Li-Ion battery inputs. A high
level of integration lowers total system cost, eases
implementation and reduces board area. The devices
feature low start-up voltage, adjustable output voltage,
PWM/PFM mode operation, low I Q , integrated
synchronous switch, internal compensation, low noise
anti-ring control, inrush current limit and soft start.
There is one feature option for the MCP1623/24 family:
PWM/PFM mode or PWM mode only.
range. During periods of light load operation, the
MCP1623 continues to operate at a constant 500 kHz
switching frequency, keeping the output ripple voltage
lower than PFM mode. During PWM-only mode, the
MCP1623 P-Channel switch acts as a synchronous
rectifier by turning off to prevent reverse current flow
from the output cap back to the input in order to keep
efficiency high. For noise immunity, the N-Channel
MOSFET current sense is blanked for approximately
100 ns. With a typical minimum duty cycle of 100 ns,
the MCP1623 continues to switch at a constant
represents the input voltage versus load current for the
4.1.1
PWM/PFM MODE OPTION
pulse-skipping threshold in PWM-only mode. At lighter
loads, the MCP1623 device begins to skip pulses.
The MCP1624 devices use an automatic switchover
from PWM to PFM mode for light load conditions to
TABLE 4-1:
PART NUMBER SELECTION
maximize efficiency over a wide range of output current.
During PFM mode, higher peak current is used to pump
Part Number
PWM/PFM
PWM
the output up to the threshold limit. While operating in
PFM or PWM mode, the P-Channel switch is used as a
synchronous rectifier, turning off when the inductor
current reaches 0 mA to maximize efficiency. In PFM
mode, a comparator is used to terminate switching when
the output voltage reaches the upper threshold limit.
Once switching has terminated, the output voltage will
decay or coast down. During this period, very low I Q is
consumed from the device and input source, which
keeps power efficiency high at light load. The
disadvantages of PWM/PFM mode are higher output
ripple voltage and variable PFM mode frequency. The
PFM mode frequency is a function of input voltage,
output voltage and load. While in PFM mode, the boost
converter pumps the output up at a switching frequency
of 500 kHz.
DS41420C-page 10
MCP1624
MCP1623
X
X
? 2011 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MCP16251T-I/MNY | 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 |
| MCP16252 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low Quiescent Current, PFM/PWM Synchronous Boost Regulator |
| MCP16252T-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 |
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