参数资料
| 型号： | MIC37100-1.8WS TR |
| 厂商： | Micrel Inc |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V 1A SOT-223 |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.8V |
| 输入电压： | 2.25 V ~ 6 V |
| 电压 - 压降（标准）： | 0.28V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-261-4，TO-261AA |
| 供应商设备封装： | SOT-223 |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC37100-1.8WSTR MIC37100-1.8WSTR-ND |
Micrel, Inc.
Application Information
The MIC37100/01/02 is a high-performance low-dropout
voltage regulator suitable for moderate to high-current
voltage regulator applications. Its 500mV dropout voltage
at full load and overtemperature makes it especially
valuable in battery-powered systems and as high-
ef ? ciency noise ? lters in post-regulator applications.
Unlike older NPN-pass transistor designs, where the
minimum dropout voltage is limited by the base-to-emitter
voltage drop and collector-to-emitter saturation voltage,
dropout performance of the PNP output of these devices
is limited only by the low VCE saturation voltage.
A trade-off for the low dropout voltage is a varying base
drive requirement. Micrel’s Super β eta PNP ? process
reduces this drive requirement to only 2% of the load
current.
The MIC37100/01/02 regulator is fully protected from
damage due to fault conditions. Linear current limiting is
provided. Output current during overload conditions is
constant. Thermal shutdown disables the device when the
die temperature exceeds the maximum safe operating
temperature. The output structure of these regulators
allows voltages in excess of the desired output voltage to
be applied without reverse current ? ow.
MIC37100/37101/37102
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
An input capacitor of 1μF or greater is recommended
when the device is more than 4 inches away from the bulk
ac supply capacitance or when the supply is a battery.
Small, surface mount, ceramic chip capacitors can be
used for bypassing. Larger values will help to improve
ripple rejection by bypassing the input to the regulator,
further improving the integrity of the output voltage.
Error Flag
The MIC37101 features an error ? ag (FLG), which
monitors the output voltage and signals an error condition
when this voltage drops 5% below its expected value. The
error ? ag is an open-collector output that pulls low under
fault conditions and may sink up to 10mA. Low output
voltage signi ? es a number of possible problems, including
an overcurrent fault (the device is in current limit) or low
input voltage. The ? ag output is inoperative during
overtemperature conditions. A pull-up resistor from FLG
V IN
C IN
MIC37100-x.x
IN OUT
GND
V OUT
C OUT
to either V IN or V OUT is required for proper operation. For
information regarding the minimum and maximum values
of pull-up resistance, refer to the graph in the “Typical
Characteristics” section of the data sheet.
Enable Input
The MIC37101 and MIC37102 versions feature an
active-high enable input (EN) that allows on-off control of
Figure 1. Capacitor Requirements
Output Capacitor
The MIC37100/01/02 requires an output capacitor to
maintain stability and improve transient response. As a
μCap LDO, the MIC37100/01/02 can operate with
ceramic output capacitors as long as the amount of
capacitance is 10μF or greater. For values of output
capacitance lower than 10μF, the recommended ESR
range is 200m ? to 2 ? . The minimum value of output
capacitance recommended for the MIC37100/01/02 is
4.7μF.
For 10μF or greater the ESR range recommended is less
than 1 ? . Ultra-low ESR ceramic capacitors are
recommended for output capacitance of 10μF or greater
to help improve transient response and noise reduction at
high frequency. 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
the regulator. Current drain reduces to “zero” when the
device is shutdown, with only microamperes of leakage
current. The EN input has TTL/CMOS compatible
thresholds for simple logic interfacing. EN may be
directly tied to V IN and pulled up to the maximum supply
voltage
Transient Response and 3.3V to 2.5V or 2.5V to 1.8V,
1.65V or 1.5V Conversion
The MIC37100/01/02 has excellent transient response to
variations in input voltage and load current. The device
has been designed to respond quickly to load current
variations and input voltage variations. Large output
capacitors are not required to obtain this performance. A
standard 10μF output capacitor, is all that is required.
Larger values help to improve performance even further.
By virtue of its low-dropout voltage, this device does not
saturate into dropout as readily as similar NPN-based
designs. When converting from 3.3V to 2.5V or 2.5V to
1.8V, or lower, the NPN based regulators are already
operating in dropout, with typical dropout requirements
of 1.2V or greater. To convert down to 2.5V or 1.8V
September 2007
11
M9999-090607
相关PDF资料 |
PDF描述 |
|---|---|
| MIC37100-1.65WS TR | IC REG LDO 1.65V 1A SOT-223 |
| MIC37100-1.5WS TR | IC REG LDO 1.5V 1A SOT-223 |
| MIC5320-GGYD6 TR | IC REG LDO 1.8V .15A TSOT-23 |
| SPX2945M3-L-3-3/TR | IC REG LDO 3.3V .4A SOT223-3 |
| HCC44DREI-S13 | CONN EDGECARD 88POS .100 EXTEND |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC371002.5BS | 制造商:Micrel Inc 功能描述:LDO Regulator Pos 2.5V 1A 4-Pin(3+Tab) SOT-223 |
| MIC37100-2.5BS | 功能描述:IC REG LDO 2.5V 1A SOT223 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC37100-2.5BS TR | 功能描述:IC REG LDO 2.5V 1A SOT-223 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC37100-2.5WS | 功能描述:低压差稳压器 - LDO 1.0A Low Voltage uCap LDO Regulator in SOT223 Pkg(ROHS Compliant) 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 |
| MIC37100-2.5WS TR | 功能描述:低压差稳压器 - LDO 1.0A Low Voltage uCap LDO Regulator in SOT223 Pkg(ROHS Compliant) 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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