参数资料
| 型号： | MIC5295-3.3YD TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V .15A TO-252-5 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 24V |
| 电压 - 压降（标准）： | 0.3V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-252-6，DPak（5 引线 + 接片） |
| 供应商设备封装： | TO-252-5 |
| 包装： | 标准包装 |
| 其它名称： | 576-3619-6 |
P D(MAX) = ? ?
? T J(MAX) ? T A ?
?
? 125 ° C ? T A ?
? ? ?
V OUT = V REF ? 1 + ? ? 1
? R 2
? ?
?
Micrel, Inc.
Application Information
Enable/Shutdown
The MIC5295 comes with an 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. Do not leave this pin
floating as the output will be in indeterminate state.
Input Capacitor
The MIC5295 has high input voltage capability up to
24V. The input capacitor must be rated to sustain
voltages that may be used on the input. An input
capacitor may be required when the device is not near
the source power supply or when supplied by a battery.
Small, surface mount, ceramic capacitors can be used
for bypassing. Larger values may be required if the
source supply has high ripple.
Output Capacitor
The MIC5295 requires an output capacitor for stability.
The design requires 2.2μF or greater on the output to
maintain stability. The design is optimized for use with
low-ESR ceramic chip capacitors. High ESR capacitors
may cause high frequency oscillation. The maximum
recommended ESR is 3 ? . The output capacitor can be
increased without limit. Larger valued capacitors help to
improve transient response.
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
a X7R ceramic capacitor to ensure the same minimum
capacitance over the equivalent operating temperature
range.
No-Load Stability
The MIC5295 will remain stable with no load unlike
many other voltage regulators. This is especially
important in CMOS RAM keep-alive applications.
Thermal Considerations
The MIC5295 is designed to provide 150mA of
continuous current in a small package. Maximum
ambient operating temperature can be calculated based
on the output current and the voltage drop across the
MIC5295
part. For example, given that the input voltage of 3.3V
the output voltage is 2.3V and the output current =
150mA. The actual power dissipation of the regulator
circuit can be determined using the equation:
P D = (V IN – V OUT )I OUT + V IN × I GND
Due to the potential for input voltages up to 24V, ground
current must be taken into consideration.
P D(MAX) = (3.3 – 2.3V)150mA + 3.3x 1.2mA
P D(MAX) = 0.154W
The junction-to-ambient thermal resistance for the
MIC5295, D-Pak is 50°C/W.To determine the maximum
ambient operating temperature of the package, use the
junction-to-ambient thermal resistance of the device and
the following basic equation:
?
? θ JA ?
T J(MAX) is the maximum junction temperature of the die,
125°C, the maximum ambient temperature can be
calculated to be 117.3°C as shown below:
0.154W = ? ?
? 50 ° C/W ?
T A = 117.3°C
Adjustable Regulator Application
The MIC5295YD can be adjusted from 1.24V to 20V by
using two external resistors (Figure 1). The resistors set
the output voltage based on the following equation:
? ? R ? ?
? ?
Where V REF = 1.24V.
Feedback resistor R2 should be no larger than 300k ? .
Figure 1. Adjustable Voltage Application
November 2009
8
M9999-110209-A
相关PDF资料 |
PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5295-5.0YD | 制造商:Micrel Inc 功能描述:Micrel MIC5295-5.0YD, Adjustable Low-Dropout Voltage Regulator 制造商:Micrel Inc 功能描述:IC REG LDO 5V 0.15A TO252-5 制造商:Micrel Inc 功能描述:IC LDO 5V 150MA LOW IQ 5TO252 制造商:Micrel Inc 功能描述:IC, LDO, 5V, 150MA, LOW IQ, 5TO252 制造商:Micrel Inc 功能描述:IC, LDO, 5V, 150MA, LOW IQ, 5TO252, Primary Input Voltage:24V, Output Voltage Fixed:5V, Dropout Voltage Vdo:300mV, Voltage Regulator Case Style:TO-252, No. of Pins:5, Output Current:150mA, Operating Temperature Min:-40C, Operating , RoHS Compliant: Yes 制造商:Micrel Inc 功能描述:Low Current, 150mA LDO Regulator |
| MIC5295-5.0YD TR | 功能描述:低压差稳压器 - LDO Low Quiescent, High Vin 150mA 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 |
| MIC5295-5.0YD-TR | 功能描述:Linear Voltage Regulator IC Positive Fixed 1 Output 5V 150mA TO-252-5 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，固定式 电压 - 输出:5V 电流 - 输出:150mA 电压 - 跌落（典型值）:0.3V @ 150mA 稳压器数:1 电压 - 输入:最高 24V 电流 - 限制（最小值）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-6，DPak（5 引线 + 接片） 供应商器件封装:TO-252-5 标准包装:1 |
| MIC5295YD | 制造商:Micrel 功能描述:Micrel MIC5295YD, Low-Dropout (LDO) Voltage Regulators 制造商:Micrel Inc 功能描述:IC LDO 150MA LOW IQ 5TO252 制造商:Micrel Inc 功能描述:IC, LDO, 150MA, LOW IQ, 5TO252 制造商:Micrel Inc 功能描述:IC, LDO, 150MA, LOW IQ, 5TO252; Primary Input Voltage:24V; Dropout Voltage Vdo:300mV; Voltage Regulator Case Style:TO-252; No. of Pins:5; Output Current:150mA; Operating Temperature Min:-40C; Operating Temperature Max:125C; SVHC:No;RoHS Compliant: Yes 制造商:Micrel 功能描述:Low Current, 150mA LDO Regulator |
| MIC5295YD TR | 功能描述:低压差稳压器 - LDO Low Quiescent, High Vin 150mA 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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