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参数资料
| 型号： | MIC47100-08YMME |
| 厂商： | Micrel Inc |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 0.8V 1A 8-MSOP |
| 标准包装： | 100 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 0.8V |
| 输入电压： | 1 V ~ 3.6 V |
| 电压 - 压降（标准）： | 0.08V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A |
| 电流 - 限制（最小）： | 1.1A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 8-MSOP-EP |
| 包装： | 管件 |
| 产品目录页面： | 1108 (CN2011-ZH PDF) |
| 其它名称： | 576-3113-5 |
R1 = R2 × ? ? OUT ? 1 ? ?
Micrel, Inc.
Applications Information
The MIC47100 is a high speed, dual supply NMOS LDO
designed to take advantage of point-of-load applications that
use multiple supply rails to generate a low voltage, high
current power supply. The MIC47100 can source 1A of
output current while only requiring a 1μF ceramic output
capacitor for stability.
The MIC47100 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 MIC47100. Bypassing on
the bias pin is recommended to improve performance
of the regulator during line and load transients. Small
ceramic capacitors from V BIAS -to-ground help reduce
high frequency noise from being injected into the
control circuitry from the bias rail and are good design
practice.
Input Supply Voltage
V IN provides the supply to power the LDO. The
minimum input voltage is 1V, allowing conversion from
low voltage supplies.
Output Capacitor
The MIC47100 requires an output capacitor of 1μF or
greater to maintain stability. The design is optimized
for use with low-ESR ceramic chip capacitors. High
ESR capacitors may cause high frequency oscillation.
The output capacitor can be increased, but
performance has been optimized for a 1μF ceramic
output capacitor and does not improve significantly
with larger capacitance.
X7R/X5R dielectric-type 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 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 capacitor to ensure
the same minimum capacitance over the equivalent
operating temperature range.
Input Capacitor
The MIC47100 is a high-performance, high bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 1μF capacitor is
required from the input to ground to provide stability.
Low-ESR ceramic capacitors provide optimal
MIC47100
frequency capacitors, such as small-valued NPO
dielectric-type capacitors, help filter out high-
frequency noise and are good practice in any RF-
based circuit.
Minimum Load Current
The MIC47100, unlike most other regulators, does not
require a minimum load to maintain output voltage
regulation.
Adjustable Regulator Design
The MIC47100 adjustable version allows
programming the output voltage anywhere between
0.8V and 2.0V. Two resistors are used. The R1
resistor value between V OUT and the adjust pin should
not exceed 10k ? . Larger values can cause instability.
R2 connects between the adjust pin and ground. The
resistor values are calculated by:
? V ?
? 0.7 ?
Where V OUT is the desired output voltage.
Enable/Shutdown
The MIC47100 comes with a single active-high enable
pin that allows the regulator to be disabled. Forcing
the enable pin low disables the regulator and sends it
into a “zero” off-mode-current state. In this state,
current consumed by the regulator goes nearly to
zero. Forcing the enable pin high enables the output
voltage. The active-high enable pin uses CMOS
technology and the enable pin cannot be left floating;
a floating enable pin may cause an indeterminate
state on the output.
Thermal Considerations
The MIC47100 is designed to provide 1A of
continuous current in a very small package. Maximum
ambient operating temperature can be calculated
based on the output current and the voltage drop
across the part. Given that the input voltage is 1.8V,
the output voltage is 1.2V and the output current is
1A. The actual power dissipation of the regulator
circuit can be determined using the equation:
P D = (V IN – V OUT1 ) I OUT + V BIAS I GND
Because this device is CMOS, the ground current is
insignificant for power dissipation and can be ignored
for this calculation.
P D = (1.8V – 1.2V) × 1A
P D = 0.6W
performance at a minimum of space. Additional high-
To
determine
the
maximum
ambient
operating
September 2008
10
M9999-092908-B
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| MIC47100-08YMME TR | 功能描述:低压差稳压器 - LDO 1A High Speed, Low Vin LDO in ep-MSOP8 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 |
| MIC47100-1.0YML | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
| MIC47100-1.0YML TR | 功能描述:低压差稳压器 - LDO 1A High Speed, Low Vin LDO in MLF 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 |
| MIC47100-1.0YML-TR | 功能描述:Linear Voltage Regulator IC Positive Fixed 1 Output 1V 1A 8-MLF? (2x2) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 稳压器拓扑:正，固定式 电压 - 输出:1V 电流 - 输出:1A 电压 - 跌落（典型值）:0.08V @ 1A 稳压器数:1 电压 - 输入:最高 3.6V 电流 - 限制（最小值）:1.1A 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 供应商器件封装:8-MLF?（2x2） 标准包装:1 |
| MIC47100-1.0YMME | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1A High Speed Low VIN LDO |
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