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| 型号： | MIC22600YTSE |
| 厂商： | Micrel Inc |
| 文件页数： | 12/32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.
Application Information
The MIC22600 is a 6A Synchronous step down regulator
IC with a fixed 1 MHz, voltage mode PWM control
scheme. The other features include tracking and
sequencing control for controlling multiple output power
systems, power on reset.
Component Selection
Input Capacitor
A minimum 10μF ceramic is recommended on each of
the PVIN pins for bypassing. X5R or X7R dielectrics are
recommended for the input capacitor. Y5V dielectrics is
not recommended.
MIC22600
It is important to test all operating limits before settling
on the final inductor choice.
The size requirements refer to the area and height
requirements that are necessary to fit a particular
design. Please refer to the inductor dimensions on their
datasheet.
DCR is inversely proportional to size and can represent
a significant efficiency loss. Refer to the “Efficiency
Considerations” below for a more detailed description.
EN/DLY Capacitor
EN/DLY sources 1μA out of the IC to allow a startup
delay to be implemented. The delay time is simply the
time it takes 1μA to charge CDLY to 1.25V. Therefore:
Output Capacitor
The MIC22600 was designed specifically for the use of
ceramic output capacitors and 22μF is optimum output
T DLY =
1.24 × C DLY
1.10 ? 6
capacitor. 22μF can be increased to 100μF to improve
transient performance. Since the MIC22600 is a voltage
mode controller, the control loop relies on the inductor
and output capacitor for compensation. For this reason,
do not use excessively large output capacitors. The
Efficiency Considerations
Efficiency is defined as the amount of useful output
power, divided by the amount of power consumed.
Efficiency % = ? ? OUT
? ? × 100
output capacitor requires either an X7R or X5R
dielectric. Y5V and Z5U dielectric capacitors, aside from
the undesirable effect of their wide variation in
capacitance over temperature, become resistive at high
? V × I OUT
? V IN × I IN
?
?
frequencies. Using Y5V or Z5U capacitors can cause
instability in the MIC22600.
Inductor Selection
Inductor selection is determined by the following (not
necessarily in the order of importance):
? Inductance
Maintaining high efficiency serves two purposes. It
decreases power dissipation in the power supply,
reducing the need for heat sinks and thermal design
considerations and it decreases consumption of current
for battery powered applications. Reduced current drawn
from a battery increases the devices operating time,
particularly in hand held devices.
?
?
?
Rated current value
Size requirements
DC resistance (DCR)
There are mainly two loss terms in switching converters:
conduction losses and switching losses. Conduction
losses are simply the power losses due to VI or I 2 R. For
example, power is dissipated in the high side switch
during the on cycle. The power loss is equal to the high
The MIC22600 is designed to use a 0.47μH to 4.7μH
inductor.
Maximum current ratings of the inductor are generally
given in two methods: permissible DC current and
saturation current. Permissible DC current can be rated
either for a 40°C temperature rise or a 10% loss in
inductance. Ensure the inductor selected can handle the
maximum operating current. When saturation current is
specified, make sure that there is enough margin that
the peak current will not saturate the inductor. The ripple
can add as much as 1.2A to the output current level. The
RMS rating should be chosen to be equal or greater than
the Current Limit of the MIC22600 to prevent
overheating in a fault condition. For best electrical
performance, the inductor should be placed very close to
the SW nodes of the IC.
side MOSFET RDS (ON) multiplied by the RMS Switch
Current squared (I SW2 ). During the off cycle, the low side
N-Channel MOSFET conducts, also dissipating power.
Similarly, the inductor’s DCR and capacitor’s ESR also
contribute to the I 2 R losses. Device operating current
also reduces efficiency by the product of the quiescent
(operating) current and the supply voltage. The power
consumed at 1MHz frequency and power loss due to
switching transitions add up to switching losses. A free
wheeling schottky diode is recommended to use in
parallel with synchronous N-MOSFET to improve the
efficiency.
June 2011
12
M9999-062411-D
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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