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| 型号： | MIC4744YTSE |
| 厂商： | Micrel Inc |
| 文件页数： | 10/23页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A DL 16TSSOP |
| 标准包装： | 94 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 可调至 0.6V |
| 输入电压： | 2.9 V ~ 5.5 V |
| 频率 - 开关： | 4MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-EPAD TSSOP |
| 产品目录页面： | 1093 (CN2011-ZH PDF) |
| 其它名称： | 576-3357-5 |
Micrel, Inc.
Application Information
The MIC4744 is a dual 2A PWM non-synchronous buck
regulator. By switching an input voltage supply, and
filtering the switched voltage through an inductor and
capacitor, a regulated DC voltage is obtained. Figure 1
shows a simplified example of a non-synchronous buck
converter.
MIC4744
The output voltage is regulated by pulse width
modulating (PWM) the switch voltage to the average
required output voltage. The switching can be broken up
into two cycles; On and Off.
During the On-Time, Figure 3 illustrates the high side
switch is turned on, current flows from the input supply
through the inductor and to the output. The inductor
current is charged at the rate;
( V IN ? V OUT )
L
Figure 1. Example of Non-synchronous Buck Converter
For a non-synchronous buck converter, there are two
modes of operation; continuous and discontinuous.
Continuous or discontinuous refer to the inductor
current. If current is continuously flowing through the
inductor throughout the switching cycle, it is in
continuous operation. If the inductor current drops to
zero during the off time, it is in discontinuous operation.
Critically continuous is the point where any decrease in
output current will cause it to enter discontinuous
operation. The critically continuous load current can be
? 2 ?
? V OUT ? OUT ?
I OUT = ?
D =
calculated as follows;
V
?
? V IN ?
fsw × 2 × L
Continuous or discontinuous operation determines how
we calculate peak inductor current.
Continuous Operation
Figure 3. On-Time
To determine the total on-time, or time at which the
inductor charges, the duty cycle needs to be calculated.
The duty cycle can be calculated as;
V OUT
V IN
and the On time is;
Figure 2 illustrates the switch voltage and inductor
current during continuous operation.
T ON =
D
fsw
Therefore, peak to peak ripple current is;
I pk ? pk =
( V IN ? V OUT ) × V OUT
V IN
fsw × L
Since the average peak to peak current is equal to the
load current. The actual peak (or highest current the
inductor will see in a steady-state condition) is equal to
Figure 2. Continuous Operation
the output current plus 1/2 the peak-to-peak current.
March 2009
10
M9999-030209-C
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4744YTSE TR | 功能描述:直流/直流开关调节器 4 MHz Dual 2A Integrated Switch Buck Regulator 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 |
| MIC4782 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.8 MHz Dual 2A Integrated Switch Buck Regulator |
| MIC4782YML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.8 MHz Dual 2A Integrated Switch Buck Regulator |
| MIC4782YML TR | 功能描述:直流/直流开关调节器 1.8MHz, Dual 2A Buck Regulator 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 |
| MIC4782YML-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.6V 2 Output 2A 16-VFQFN Exposed Pad, 16-MLF? 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:2 电压 - 输入（最小值）:3V 电压 - 输入（最大值）:6V 电压 - 输出（最小值/固定）:0.6V 电压 - 输出（最大值）:6V 电流 - 输出:2A 频率 - 开关:1.8MHz 同步整流器:无 工作温度:-20°C ~ 125°C（TJ） 安装类型:表面贴装 封装/外壳:16-VFQFN 裸露焊盘，16-MLF? 供应商器件封装:16-MLF?（4x4） 标准包装:1 |
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