参数资料
| 型号： | MIC5305-4.75YD5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 4.75V .15A TSOT23-5 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 4.75V |
| 输入电压： | 最高 5.5V |
| 电压 - 压降（标准）： | 0.06V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 电流 - 限制（最小）： | 300mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC5305-4.75YD5TR MIC5305-4.75YD5TR-ND |
V OUT = V REF ? 1 +
?
Micrel, Inc.
Application Information
Enable/Shutdown
The MIC5305 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. The active-high
enable pin uses CMOS technology and the enable pin
cannot be left ? oating; a ? oating enable pin may cause
an indeterminate state on the output.
Input Capacitor
The MIC5305 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.
MIC5305
No-Load Stability
Unlike many other voltage regulators, the MIC5305 will
remain stable and in regulation with no load. This is
especially import in CMOS RAM keep-alive applications.
Adjustable Regulator Application
Adjustable regulators use the ratio of two resistors to
multiply the reference voltage to produce the desired
output voltage. The MIC5305 can be adjusted from
1.25V to 5.5V by using two external resistors (Figure 1).
The resistors set the output voltage based on the
following equation:
? R1 ?
? R2 ?
V REF = 1.25V
MIC5305BML
Low-ESR ceramic capacitors provide optimal perform-
ance at a minimum of space. Additional high frequency
capacitors, such as small-valued NPO dielectric-type
capacitors, help ? lter out high-frequency noise and are
good practice in any RF-based circuit.
V IN
1μF
VIN VOUT
EN ADJ
GND
R1
R2
V OUT
1μF
Output Capacitor
P D(max) = ? ?
? T J(max) ? T A ?
?
The MIC5305 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 signi ? cantly with larger capacitance.
X7R/X5R dielectric-type ceramic capacitors are recom-
mended 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.
Bypass Capacitor
A capacitor can be placed from the noise bypass pin to
ground to reduce output voltage noise. The capacitor
bypasses the internal reference. A 0.1μF capacitor is
recommended for applications that require low-noise
outputs. The bypass capacitor can be increased, further
reducing noise and improving PSRR. Turn-on time
increases slightly with respect to bypass capacitance. A
unique, quick-start circuit allows the MIC5305 to drive a
large capacitor on the bypass pin without signi ? cantly
slowing turn-on time. Refer to the Typical Characteristics
section for performance with different bypass capacitors.
Figure 1. Adjustable Voltage Application
Thermal Considerations
The MIC5305 is designed to provide 150mA of conti-
nuous 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 5.0V, the output
voltage is 2.9V 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
Because this device is CMOS and the ground current is
typically <100μA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
P D = (5.0V – 2.9V) × 150mA P D = 0.32W
To determine the maximum ambient operating temp-
erature of the package, use the junction-to-ambient
thermal resistance of the device and the following basic
equation:
?
? θ JA ?
T J(max) = 125°C, the max. junction temperature of
the die.
θ JA thermal resistance = 93°C/W
June 2007
9
M9999-062507
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5305BML TR | 功能描述:IC REG LDO ADJ .15A 6-MLF RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5305CYML TR | 功能描述:IC REG LDO ADJ .15A 6-MLF RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:4V 输入电压:最高 16V 电压 - 压降（标准）:0.28V @ 150mA 稳压器数量:1 电流 - 输出:150mA 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:5-VFBGA 供应商设备封装:5-uSMD 包装:Digi-Reel® 其它名称:LP2985AIBP-4.0DKR |
| MIC5305YML | 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: |
| MIC5305YML TR | 功能描述:低压差稳压器 - LDO 150mA Cap Ultra LDO Regulator(Lead Free) 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 |
| MIC5305YMLTR | 制造商:Micrel 功能描述:LDO Regulator Pos 1.25V to 5.5V 0.15A |
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