参数资料
| 型号： | MIC59300WU |
| 厂商： | Micrel Inc |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 3A TO263-5 |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.5 V ~ 3.3 V |
| 输入电压： | 1 V ~ 3.8 V |
| 电压 - 压降（标准）： | 0.205V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 电流 - 限制（最小）： | 3.3A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 供应商设备封装： | TO-263-5 |
| 包装： | 管件 |
| 产品目录页面： | 1109 (CN2011-ZH PDF) |
| 其它名称： | 576-3425-5 |
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Micrel, Inc.
Application Information
The MIC59300 is an ultra-high performance, low-dropout
linear regulator designed for high current applications
requiring a fast transient response. The MIC59300
utilizes two input supplies, significantly reducing dropout
voltage, making it perfect for low-voltage, DC-to-DC
conversion. The MIC59300 requires a minimum number
of external components, and as a μ Cap regulator, the
output is tolerant of virtually any type of capacitor,
including ceramic type and tantalum type capacitors.
The MIC59300 regulator is fully protected from damage
due to fault conditions, offering linear current limiting and
thermal shutdown.
Bias Supply Voltage
V BIAS , requiring relatively light current, provides power to
the control portion of the MIC59300. V BIAS requires
approximately 30mA for a 3A load current. Dropout
conditions require higher currents. Most of the biasing
current is used to supply the base current to the pass
transistor. The bias voltage allows the pass element to
be driven into saturation, reducing the dropout to 205mV
at a 3A load current. Bypassing on the bias pin is
recommended to improve performance of the regulator
during line and load transients. Small ceramic capacitors
from VBIAS - to-ground help reduce high frequency noise
from being injected into the control circuitry from the bias
rail and constitute good design practice. Good bypass
techniques typically include one larger capacitor such as
1 μ F ceramic and smaller valued capacitors such as
0.01 μ F or 0.001 μ F in parallel with that larger capacitor to
decouple the bias supply. The VBIAS input voltage must
be 2.1V above the output voltage with a minimum VBIAS
input voltage of 3V.
Input Supply Voltage
V IN provides the high current to the collector of the pass
transistor. The minimum input voltage is 1.0V, allowing
conversion from low voltage supplies.
Output Capacitor
The MIC59300 requires a minimum of output
capacitance to maintain stability. However, proper
capacitor selection is important to ensure desired
transient response. The MIC59300 is specifically
designed to be stable with virtually any capacitance
value and ESR. A 1 μ F ceramic chip capacitor should
satisfy most applications. Output capacitance can be
increased without bound. See the “ Functional
Characteristics ” for examples of load transient response.
X7R dielectric ceramic capacitors are recommended
because of their temperature performance. X7R-type
capacitors change capacitance by 15% over their
operating temperature range and are the most stable
type of ceramic capacitors. Z5U and Y5V dielectric
MIC59300
capacitors change value by as much as 50% and 60%
respectively over their operating temperature ranges. To
use a ceramic chip capacitor with Y5V dielectric, the
value must be much higher than an X7R ceramic or a
tantalum capacitor to ensure the same capacitance
value over the operating temperature range. Tantalum
capacitors have a very stable dielectric (10% over their
operating temperature range) and can also be used with
this device.
Input Capacitor
An input capacitor of 1 μ F or greater is recommended
when the device is more than 4 inches away from the
bulk supply capacitance, or when the supply is a battery.
Small, surface-mount, ceramic chip capacitors can be
used for the bypassing. The capacitor should be placed
within 1 inch of the device for optimal performance.
Larger values will help to improve ripple rejection by
bypassing the input to the regulator, further improving
the integrity of the output voltage.
Thermal Design
Linear regulators are simple to use. The most
complicated design parameters to consider are thermal
characteristics. Thermal design requires the following
application-specific parameters:
? Maximum ambient temperature (T A )
? Output current (I OUT )
? Output voltage (V OUT )
? Input voltage (V IN )
? Ground current (I GND )
First, calculate the power dissipation (P D ) of the
regulator from these numbers and the device
parameters from this datasheet.
P D = V IN × I IN + V BIAS × I BIAS ? V OUT × I OUT
The input current will be less than the output current at
high output currents as the load increases. The bias
current is a sum of base drive and ground current.
Ground current is constant over load current. Then the
heat sink thermal resistance is determined with this
formula:
? P D ?
The heat sink may be significantly reduced in
applications where the maximum input voltage is known
and large compared with the dropout voltage. Use a
series input resistor to drop excessive voltage and
distribute the heat between this resistor and the
regulator. The low-dropout properties of the MIC59300
allow significant reductions in regulator power dissipation
and the associated heat sink without compromising
performance. When this technique is employed, a
January 2009
10
M9999-010809-A
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相关代理商/技术参数 |
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| MIC59300WU TR | 功能描述:低压差稳压器 - LDO Ultra Fast 3A LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC59300YME | 功能描述:低压差稳压器 - LDO Ultra Fast 3A LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC59300YME TR | 功能描述:低压差稳压器 - LDO Ultra Fast 3A LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MIC59960BN | 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
| MIC59P50BN | 功能描述:闭锁 8-Bit Parallel Input Protected Latched Driver RoHS:否 制造商:Micrel 电路数量:1 逻辑类型:CMOS 逻辑系列:TTL 极性:Non-Inverting 输出线路数量:9 高电平输出电流: 低电平输出电流: 传播延迟时间: 电源电压-最大:12 V 电源电压-最小:5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-16 封装:Reel |
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