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参数资料
| 型号： | MIC22600YTSE |
| 厂商： | Micrel Inc |
| 文件页数： | 13/32页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 24TSSOP |
| 标准包装： | 62 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.7V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 6A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 24-EPAD-TSSOP |
| 其它名称： | MIC22600YTSE-ND |
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Micrel, Inc.
MIC22600
0
Figure 2 shows an efficiency curve. The portion, from 0A
to 1A, efficiency losses are dominated by quiescent
current losses, gate drive and transition losses. In this
case, lower supply voltages yield greater efficiency in
that they require less current to drive the MOSFETs and
have reduced input power consumption.
95
90
85
80
75
70
65
60
55
50
Efficiency
vs. Inductance
L = 1μH
L = 4.7μH
200 400 600 800
OUTPUT CURRENT (mA)
Figure 3. Efficiency vs. Inductance
Efficiency loss due to DCR is minimal at light loads and
gains significance as the load is increased. Inductor
selection becomes a trade-off between efficiency and
size in this case.
Figure 2. Efficiency Curve
The region, 1A to 6A, efficiency loss is dominated by
MOSFET RDS (ON) and inductor DC losses. Higher input
supply voltages will increase the Gate-to-Source voltage
on the internal MOSFETs, reducing the internal RDS (ON) .
This improves efficiency by decreasing conduction loss
in the device but the inductor DCR loss is inherent to the
device. So inductor selection becomes increasingly
critical in efficiency calculations. As the inductors are
reduced in size, the DC resistance (DCR) can become
quite significant. The DCR losses can be calculated as
follows:
L PD = I OUT2 × DCR
From that, the loss in efficiency due to inductor
resistance can be calculated as follows:
Alternatively, under lighter loads, the ripple current
becomes a significant factor. When light load efficiencies
become more critical, a larger inductor value maybe
desired. Larger inductance reduces the peak-to-peak
inductor ripple current, which minimize losses. The
graph in Figure 3 illustrates the effects of inductance
value at light load.
Compensation
The MIC22600 has a combination of internal and
external stability compensation to simplify the circuit for
small, high efficiency designs. In such designs, voltage
mode conversion is often the optimum solution. Voltage
mode is achieved by creating an internal 1MHz ramp
signal and using the output of the error amplifier to
modulate the pulse width of the switch node, thereby
maintaining output voltage regulation. With a typical gain
bandwidth of 100-200kHz, the MIC22600 is capable of
extremely fast transient responses.
The MIC22600 is designed to be stable with a typical
application using a 1μH inductor and a 47μF ceramic
(X5R) output capacitor. These values can be varied
V OUT × I OUT
? ( V OUT × I OUT ) + L PD
? 1 ? ? ?
? ? × 100
? ? ?
( ) ideally less than 26 kHz to ensure
Efficiency Loss =
? ?
? ?
June 2011
? ?
?
13
dependant upon the tradeoff between size, cost and
efficiency, keeping the LC natural frequency
1
2 × Π × L ? C
stability can be achieved. The minimum recommended
inductor value is 0.47μH and minimum recommended
output capacitor value is 22μF. With a larger inductor,
there is a reduced peak-to-peak current which yields a
greater efficiency at lighter loads. A larger output
capacitor will improve transient response by providing a
larger hold up reservoir of energy to the output.
M9999-062411-D
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相关代理商/技术参数 |
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|---|---|
| MIC22600YTSE TR | 功能描述:直流/直流开关调节器 Not recommended for new designs; see MIC22705. MIC22600 = 1MHz 6A Integrated Switch Synchronous 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 |
| MIC22601 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:4 MHz, 6A Integrated Switch Synchronous Buck Regulator |
| MIC22601YML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:4 MHz, 6A Integrated Switch Synchronous Buck Regulator |
| MIC22601YML TR | 功能描述:直流/直流开关调节器 6A, 4MHz 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 |
| MIC22601YMLTR | 制造商:Micrel 功能描述:4MHz, 6A Integrated Sync Buck Regulator |
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