参数资料
| 型号： | MIC47050-1.2YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.2V .5A 6MLF |
| 特色产品： | MIC47050 Voltage Regulators |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.2V |
| 输入电压： | 最高 3.6V |
| 电压 - 压降（标准）： | 0.044V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-VQFN 裸露焊盘，6-MLF? |
| 供应商设备封装： | 6-MLF?（2x2） |
| 包装： | 标准包装 |
| 其它名称： | 576-3666-6 |
R1 ? R2 ? ? OUT ? 1 ?
? V ?
Micrel, Inc.
Functional Description
The MIC47050 is a high-speed, ultra-low dropout, dual
supply NMOS ULDO? designed to take advantage of
point-of-load applications that use multiple supply rails to
generate a low-voltage, high-current power supply. The
MIC47050 can source 0.5A of output current while only
requiring a 1μF ceramic output capacitor for stability.
The MIC47050 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 MIC47050. Bypassing on the
bias pin is recommended to improve performance of the
regulator during line and load transients. Small 0.1μF
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 1.0V. This allows conversion from low
voltage supplies to reduce the power dissipation in the
pass element.
Input Capacitor
The MIC47050 is a high-performance, high bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A 1μF capacitor is the
minimum required for stability. A 10μF ceramic capacitor
is recommended for most applications, especially if the
LDO’s headroom (V IN –V OUT ) is small and/or large load
transients are present. Fast load transient and low
headroom requires a larger input filter capacitor to
ensure that the regulator does not drop out of regulation.
A 10μF will better attenuate any voltage glitches from
exceeding the maximum voltage rating of the part.
Additional high-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.
X7R and X5R 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 capacitors are not recommended since
they 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.
MIC47050
Tantalum capacitors have a very stable dielectric (10%
over their operating temperature range) and can also be
used with this device. See the Typical Characteristic
section for examples of load transient response.
Output Capacitor
The MIC47050 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.
The output capacitor type and placement criteria are the
same as the input capacitor. See the “Input Capacitor”
subsection for a detailed description.
Minimum Load Current
The MIC47050, unlike most other regulators, does not
require a minimum load to maintain output voltage
regulation.
Adjustable Regulator Design
The MIC47050 adjustable version allows programming
the output voltage from 0.4V to 2.0V. Two external
resistors are required. The R1 resistor value between
V OUT and the ADJ pin should not exceed 10k ? , as larger
values can cause instability. R2 connects between the
ADJ pin and ground. The resistor values are calculated
as follows:
? V ?
? REF ?
Where V OUT is the desired output voltage and V REF is the
internal reference voltage.
Enable/Shutdown
The MIC47050 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.
April 2012
10
M9999-040312-B
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| MIC4720YMME TR | IC REG BUCK ADJ 2A 10MSOP |
| MIC4721YMMTR | IC REG BUCK ADJ 1.5A 10MSOP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC47050YML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:500mA ULDO? with Low Input and Low Output Voltage |
| MIC47050YML TR | 功能描述:低压差稳压器 - LDO Low Vin Single 500mA Adjustable LDO in Small 2mm x2mm 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 |
| MIC47050YML-TR | 功能描述:Linear Voltage Regulator IC Positive Adjustable 1 Output 0.4 V ~ 2 V 500mA 6-MLF? (2x2) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 稳压器拓扑:正，可调式 电压 - 输出:0.4 V ~ 2 V 电流 - 输出:500mA 电压 - 跌落（典型值）:0.044V @ 500mA 稳压器数:1 电压 - 输入:1 V ~ 3.6 V 电流 - 限制（最小值）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-VQFN 裸露焊盘，6-MLF? 供应商器件封装:6-MLF?（2x2） 标准包装:1 |
| MIC47050YMT | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:500mA ULDO? with Low Input and Low Output Voltage |
| MIC47050YMT TR | 功能描述:低压差稳压器 - LDO Low Vin Single 500mA Adjustable 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 |
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