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参数资料
| 型号： | MAX1983 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Voltage, Low-Dropout Linear Regulators with External Bias Supply |
| 中文描述： | 低电压、低压差线性稳压器，外部偏置电源 |
| 文件页数： | 10/12页 |
| 文件大小： | 383K |
| 代理商： | MAX1983 |
M
Current Limit
The MAX1982/MAX1983 limit the output current to
600mA (typ) in the event of an overload or output short
circuit. The current limit prevents damage to the inter-
nal power transistor, but the device can enter thermal
shutdown if the power dissipation is great enough to
increase the die temperature above +160
°
C (see the
Thermal-Overload Protection
section).
Thermal-Overload Protection
Thermal-overload protection limits the power dissipa-
tion in the MAX1982/MAX1983. When the die tempera-
ture exceeds +160
°
C, the pass transistor turns off,
allowing the device to cool. Normal operation resumes
when the die temperature cools by 20
°
C. A continuous
thermal-overload condition results in a pulsed output.
For continuous operation, do not exceed a junction
temperature of +150
°
C.
Applications Information
Output Voltage Selection
The MAX1982 output is fixed at 1.2V. The MAX1983
provides an adjustable output (0.8V to 2.0V). Connect
ADJ to a resistive voltage-divider between OUT and
GND as shown in Figure 4. Set the output voltage using
the following equation:
Set R2 at 40k
and choose R1 to achieve the desired
output voltage. Set V
IN
to higher than (V
OUT
+ 400mV)
to meet the dropout voltage requirement (see the
Input/Output (Dropout) Voltage
section).
To ensure stability over the specified input voltage
range, the minimum output capacitance must be 10μF
with a maximum ESR of 35m
.
Operating Region and Power Dissipation
The maximum power dissipation of the MAX1982/
MAX1983 depends on the thermal resistance of the 6-pin
SOT23 package and the circuit board, the temperature
difference between the die and ambient air, and the rate
of airflow. The power dissipated in the device is:
The resulting maximum power dissipation is:
where T
J(MAX)
is the maximum junction temperature
(+150
°
C) and T
A
is the ambient temperature,
θ
JC
is the
thermal resistance from the die junction to the package
case, and
θ
CA
is the thermal resistance from the case
through the PC board, copper traces, and other materi-
als to the surrounding air. For optimum power dissipa-
tion, use a large ground plane with good thermal
contact to GND, and use wide input and output traces.
When 1 square inch of copper is connected to the
device, the maximum allowable power dissipation of a
6-pin SOT23 package is 696mW. The maximum power
dissipation is derated by 8.7mW/
°
C above T
A
= +70
°
C.
Extra copper on the PC board increases thermal mass,
and reduces thermal resistance of the board. Refer to
the MAX1982/MAX1983 EV kit for a layout example.
The MAX1982/MAX1983 deliver up to 300mA and oper-
ate with input voltages up to 5.5V, but not simultane-
ously. High output currents can only be achieved when
the input-output differential voltages are low (Figure 5).
Undervoltage Lockout (UVLO)
The undervoltage lockout (UVLO) circuit ensures that
the regulator starts up with adequate voltage for the
gate-drive circuitry to bias the internal pass transistor.
P
T
T
DISS MAX
(
J MAX
(
θ
A
JC
CA
)
)
θ
=
+
P
I
V
V
D
OUT
IN
OUT
=
×
(
)
V
V
R
R
OUT
=
+
0.
1
1
2
Low-Voltage, Low-Dropout Linear Regulators
with External Bias Supply
10
______________________________________________________________________________________
0.1
μ
F
BIAS
GND
SHDN
ON
OFF
IN
OUT
PGOOD
100k
10
μ
F
10
μ
F
4.5V TO 5.5V
1.25V TO 5.5V
1.2V
MAX1982
Figure 3. MAX1982 Typical Application Circuit
0.1
μ
F
BIAS
GND
SHDN
ON
OFF
IN
OUT
ADJ
R2
40k
10
μ
F
4.5V TO 5.5V
1.5V TO 5.5V
1.2V
MAX1983
10
μ
F
R1
20k
Figure 4. MAX1983 Typical Application Circuit
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相关代理商/技术参数 |
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| MAX1983EUT | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE, LOW-DROPOUT LINEAR REGULATORS WI - Bulk 制造商:Rochester Electronics LLC 功能描述: |
| MAX1983EUT+ | 制造商:Maxim Integrated Products 功能描述:LDO REG 0.8V TO 2V 0.3A 6PIN SOT-23 - Rail/Tube |
| MAX1983EUT+T | 功能描述:低压差稳压器 - LDO Low-Voltage w/ External Bias Supply 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 |
| MAX1983EUT-T | 功能描述:低压差稳压器 - 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 |
| MAX1984ETP | 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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