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| 型号： | ADP124ARHZ-3.3-R7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 5.5V INPUT, 500 MA, LOW QUIESCENT CURRENT, CMOS LINEAR REGULATOR W/31 FIXED-OUTPUT VOLTAGES No of Pins: 8 Temperature Range: Ind |
| 中文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.23 V DROPOUT, PDSO8 |
| 封装： | ROHS COMPLIANT, MO-187AAT, MSOP-8 |
| 文件页数： | 3/20页 |
| 文件大小： | 648K |
| 代理商： | ADP124ARHZ-3.3-R7 |
ADP124/ADP125
Rev. A | Page 11 of 20
THEORY OF OPERATION
The ADP124/ADP125 are low quiescent current, low dropout
linear regulators that operate from 2.3 V to 5.5 V and can provide
up to 500 mA of output current. Drawing a low 210 A of quies-
cent current (typical) at full load makes the ADP124/ADP125
ideal for battery-operated portable equipment. Shutdown current
consumption is typically 100 nA.
Optimized for use with small 1 F ceramic capacitors, the
ADP124/ADP125 provide excellent transient performance.
Internally, the ADP124/ADP125 consist of a reference, an error
amplifier, a feedback voltage divider, and a PMOS pass transistor.
Output current is delivered via the PMOS pass device, which is
controlled by the error amplifier. The error amplifier compares
the reference voltage with the feedback voltage from the output
and amplifies the difference. If the feedback voltage is lower than
the reference voltage, the gate of the PMOS device is pulled lower,
allowing more current to pass and increasing the output voltage.
If the feedback voltage is higher than the reference voltage, the
gate of the PMOS device is pulled higher, allowing less current
to pass and decreasing the output voltage.
The adjustable ADP125 has an output voltage range of 0.8 V to
5.0 V. The output voltage is set by the ratio of two external resistors,
as shown in Figure 2. The device servos the output to maintain
the voltage at the ADJ pin at 0.5 V referenced to ground. The
current in R1 is then equal to 0.5 V/R2 and the current in R1 is
the current in R2 plus the ADJ pin bias current. The ADJ pin
bias current, 15 nA at 25°C, flows through R1 into the ADJ pin.
The output voltage can be calculated using the equation:
VOUT = 0.5 V(1 + R1/R2) + (ADJI-BIAS)(R1)
The value of R1 should be less than 200 kΩ to minimize errors
in the output voltage caused by the ADJ pin bias current. For
example, when R1 and R2 each equal 200 k Ω, the output voltage
is 1.0 V. The output voltage error introduced by the ADJ pin
bias current is 3 mV or 0.3%, assuming a typical ADJ pin bias
current of 15 nA at 25°C.
Note that in shutdown, the output is turned off and the divider
current is 0.
The ADP124/ADP125 use the EN pin to enable and disable the
VOUT pin under normal operating conditions. When EN is high,
VOUT turns on; when EN is low, VOUT turns off. For automatic
startup, EN can be tied to VIN.
SHORT CIRCUIT,
UVLO, AND
THERMAL
PROTECT
0.5V REFERENCE
ADP124
SHUTDOWN
VIN
VOUT
R1
R2
GND
NOTES
1. R1 AND R2 ARE INTERNAL RESISTORS, AVAILABLE ON
THE ADP124 ONLY.
EN
VOUT SENSE
08476-
121
Figure 28. ADP124 Internal Block Diagram (Fixed Output)
SHORT CIRCUIT,
UVLO, AND
THERMAL
PROTECT
0.5V REFERENCE
SHUTDOWN
VIN
VOUT
GND
EN
08476-
122
ADP125
ADJ
Figure 29. ADP125 Internal Block Diagram (Adjustable Output)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP124CP-3.3-EVALZ | 制造商:AD 制造商全称:Analog Devices 功能描述:5.5 V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulators |
| ADP124CPZ-REDYKIT | 功能描述:REDYKIT 2.8/3.3 ADP124CPZ RoHS:是 类别:编程器，开发系统 >> 评估板 - 线性稳压器 (LDO) 系列:* 产品变化通告:1Q2012 Discontinuation 30/Mar/2012 设计资源:NCP590MNDPTAGEVB Gerber Files 标准包装:1 系列:- 每 IC 通道数:2 - 双 输出电压:1.8V，2.8V 电流 - 输出:300mA 输入电压:2.1 ~ 5.5 V 稳压器类型:正，固定式 工作温度:-40°C ~ 85°C 板类型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名称:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
| ADP124RHZ-REDYKIT | 功能描述:REDYKIT 2.8/3.3 ADP124 RoHS:是 类别:编程器，开发系统 >> 评估板 - 线性稳压器 (LDO) 系列:Redykit™ 产品变化通告:1Q2012 Discontinuation 30/Mar/2012 设计资源:NCP590MNDPTAGEVB Gerber Files 标准包装:1 系列:- 每 IC 通道数:2 - 双 输出电压:1.8V，2.8V 电流 - 输出:300mA 输入电压:2.1 ~ 5.5 V 稳压器类型:正，固定式 工作温度:-40°C ~ 85°C 板类型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名称:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
| ADP125 | 制造商:AD 制造商全称:Analog Devices 功能描述:5.5 V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulators |
| ADP1250001RHZR | 制造商:Analog Devices 功能描述: |
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