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| 型号： | AP7331-30WG-7 |
| 厂商： | Diodes Inc |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3V .3A SOT25-5 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3V |
| 输入电压： | 最高 6V |
| 电压 - 压降（标准）： | 0.3V @ 300mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA（最小值） |
| 电流 - 限制（最小）： | 400mA |
| 工作温度： | -40°C ~ 85°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-25 |
| 包装： | 标准包装 |
| 产品目录页面： | 1135 (CN2011-ZH PDF) |
| 其它名称： | AP7331-30WG-7DIDKR |
AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
Application Note
Input Capacitor
A 1 μ F ceramic capacitor is recommended to connect
between V IN and GND pins to decouple input power supply
glitch and noise. The amount of the capacitance may be
increased without limit. This input capacitor must be
located as close as possible to the device to assure input
stability and less noise. For PCB layout, a wide copper
trace is required for both V IN and GND. A lower ESR
capacitor allows the use of less capacitance, while higher
ESR type requires more capacitance.
Output Capacitor
The output capacitor is required to stabilize and help
transient response for LDO. The AP7331 is stable with
very small ceramic output capacitors. The recommended
capacitance is from 1 μ F to 4.7 μ F, Equivalent Series
Resistance (ESR) is from 10m Ω to 200m Ω , and
temperature characteristic is X7R or X5R. Higher
capacitance values help to improve load/line transient
response. The output capacitance may be increased to
keep low undershoot/overshoot. Place output capacitor as
close as possible to OUT and GND pins, and keep the
leads as short as possible.
ON/OFF Input Operation
The AP7331 is turned on by setting the EN pin high, and
is turned off by pulling it low. If this feature is not used,
the EN pin should be tied to IN pin to keep the regulator
output on at all time. To ensure proper operation, the
signal source used to drive the EN pin must be able to
swing above and below the specified turn-on/off voltage
thresholds listed in the Electrical
Characteristics section under V IL and V IH .
Current Limit Protection
When output current at OUT pin is higher than current
limit threshold, the current limit protection will be
triggered and clamp the output current to approximately
600mA to prevent over-current and to protect the
regulator from damage due to overheating.
Short Circuit Protection
When OUT pin is short-circuit to GND or OUT pin voltage
is less than 200mV, short circuit protection will be
triggered and clamp the output current to approximately
100mA. This feature protects the regulator from over-
current and damage due to overheating.
Adjustable Operation
The AP7331 provides output voltage from 0.8V to 5.0V
through external resistor divider as shown below.
Thermal Shutdown Protection
Thermal protection disables the output when the junction
V IN
IN
OUT
V OUT
temperature rises to approximately +140°C, allowing the
device to cool down. When the junction temperature
reduces to approximately +125°C the output circuitry is
A P 73 3 1
R1
enabled again. Depending on power dissipation, thermal
1uF
E n a ble
EN
ADJ
1uF
resistance, and ambient temperature, the thermal
protection circuit may cycle on and off. This cycling limits
GND
R2
the heat dissipation of the regulator, protecting it from
damage due to overheating.
Ultra Fast Start-up
After enabled, the AP7331 is able to provide full power in
V OUT = V REF ? ? 1 +
?
R 1 = R 2 ? ? OUT ? 1 ? ?
The output voltage is calculated by:
? R1 ?
?
? R 2 ?
Where V REF =0.4V (the internal reference voltage)
Rearranging the equation will give the following that is
used for adjusting the output to a particular voltage:
? V ?
? V REF ?
To maintain the stability of the internal reference voltage,
R 2 need to be kept smaller than 125k Ω .
No Load Stability
Other than external resistor divider, no minimum load is
required to keep the device stable. The device will remain
stable and regulated in no load condition.
as little as tens of microseconds, typically 80μs, without
sacrificing low ground current. This feature will help load
circuitry move in and out of standby mode in real time,
eventually extend battery life for mobile phones and other
portable devices.
Fast Transient Response
Fast transient response LDOs can extend battery life.
TDMA-based cell phone protocols such as Global
System for Mobile Communications (GSM) have a
transmit/receive duty factor of only 12.5 percent, enabling
power savings by putting much of the baseband circuitry
into standby mode in between transmit cycles. In
baseband circuits, the load often transitions virtually
instantaneously from 100μA to 100mA. To meet this load
requirement, the LDO must react very quickly without a
large voltage drop or overshoot — a requirement that
cannot be met with conventional, general-purpose LDOs.
AP7331
Document number: DS31914 Rev. 3 - 2
8 of 13
January 2011
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AP7331-33SNG-7 | 功能描述:低压差稳压器 - LDO LDO DFN2020-6 3.3V/300MA 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 |
| AP7331-33WG-7 | 功能描述:低压差稳压器 - LDO LDO SOT-25 3.3V/300MA 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 |
| AP7331-SNG-7 | 功能描述:低压差稳压器 - LDO LDO DFN2020-6 ADJUSTABLE 300MA 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 |
| AP7331-WG-7 | 功能描述:低压差稳压器 - LDO LDO SOT-25 ADJUSTABLE 300MA 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 |
| AP7332 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:DUAL 300mA LOW QUIESCENT CURRENT FAST TRANSIENT LOW DROPOUT |
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