参数资料
| 型号： | MIC37301-1.5WR TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.5V 3A SPAK-5 |
| 标准包装： | 750 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.5V |
| 输入电压： | 2.25 V ~ 6 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SPAK-5 |
| 供应商设备封装： | S-PAK-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC37301-1.5WRTR MIC37301-1.5WRTR-ND |
Micrel, Inc.
Input Capacitor
An input capacitor of 1.0μF 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 chip
capacitors can be used for the bypassing. The
capacitor should be place within 1" 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.
Transient Response and 3.3V to 2.5V, 2.5V to 1.8V
or 1.65V, or 2.5V to 1.5V Conversions
The MIC37300/01/02/03 has excellent transient
response to variations in input voltage and load
MIC37300/01/02/03
Low output voltage can be caused by a number of
problems, including an overcurrent fault (device in
current limit) or low input voltage. The ?ag is
inoperative during overtemperature shutdown.
Enable Input
The MIC37301/02/03 also features an enable input for
on/off control of the device. Its shutdown state draws
“zero” current (only microamperes of leakage). The
enable input is TTL/CMOS compatible for simple logic
interface, but can be connected up to VIN. When
enabled, it draws approximately 15μA.
Adjustable Regulator Design
MIC37302
current. The device has been designed to respond
V IN
IN
OUT
V OUT
quickly to load current variations and input voltage
R1
variations. Large output capacitors are not required to
obtain this performance. A standard 47μF output
ENABLE
SHUTDOWN
EN
ADJ
GND
R2
C OUT
capacitor, preferably tantalum, is all that is required.
Larger values help to improve performance even
V OUT = 1.240V ? 1 +
?
further.
By virtue of its low-dropout voltage, this device does
?
?
R1 ?
R2 ?
not saturate into dropout as readily as similar NPN-
based designs. When converting from 3.3V to 2.5V,
2.5V to 1.8V or 1.65V, or 2.5V to 1.5V, the NPN-
based regulators are already operating in dropout,
with typical dropout requirements of 1.2V or greater.
To convert down to 2.5V without operating in dropout,
NPN-based regulators require an input voltage of 3.7V
at the very least. The MIC37300/01/02/03 regulator
will provide excellent performance with an input as low
as 3.0V or 2.25V, respectively. This gives the PNP-
based regulators a distinct advantage over older,
NPN-based linear regulators.
Figure 1. Adjustable Regulator with Resistors
The MIC37302 and MIC37303 allow programming the
output voltage any-where between 1.24V and the
5.5V maximum operating rating of the family. Two
resistors are used. Resistors can be quite large, up to
1M Ω , because of the very high input impedance and
low bias current of the sense comparator.
The resistor values are calculated by:
R 1 = R 2 ? OUT ? 1 ?
Minimum Load Current
T he MIC37300/01/02/03 regulator is speci?ed
between ?nite loads. If the output current is too small,
leakage currents dominate and the output voltage
rises. A 10mA minimum load current is necessary for
proper operation. For adjustable regulators, this can
? 1 . 240 ?
? V ?
Eq. 3
be accomplished by selecting the feedback resistors
to load the output with 10mA.
Error Flag
The MIC37301 and MIC37303 feature an error ?ag
circuit that monitors the output voltage and signals an
error condition when the voltage is 5% below the
nominal outp ut voltage. The error ?ag is an open -
collector output that can sink 10mA during a fault
condition.
shows component de?nition. Applications with widely
varying load currents may scale the resistors to draw
the minimum load current required for proper
operation.
March 25, 2014
10
Revision 1.1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC37301-2.5BR | 功能描述:IC REG LDO 2.5V 3A SPAK-5 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 |
| MIC37301-2.5BR TR | 功能描述:IC REG LDO 2.5V 3A SPAK-5 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 |
| MIC37301-2.5WR | 功能描述:低压差稳压器 - LDO 3A Low Voltage LDO Regulator(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 |
| MIC37301-2.5WR TR | 功能描述:低压差稳压器 - LDO 3A Low Voltage LDO Regulator(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 |
| MIC37301-2.5YME | 功能描述:低压差稳压器 - LDO 3A, Low Voltage Cap LDO Regulator 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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