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参数资料
| 型号： | MAX1818EUT25#TG16 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V/ADJ .5A SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 2.5V，1.25 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.21V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA（最小） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-6 |
| 包装： | 标准包装 |
| 其它名称： | MAX1818EUT25#TG16DKR |
500mA Low-Dropout
Linear Regulator in SOT23
MAXIMUM OUTPUT CURRENT
R1 = R2
V OUT
1.25V
-1
vs. INPUT VOLTAGE
(POWER DISSIPATION LIMIT)
V IN = 2.5V TO 5.5V
C IN
1 μ F
IN
MAX1818
OUT
C OUT
3.3 μ F
R 1
V OUT
600
400
MAXIMUM RECOMMENDED
OUTPUT CURRENT
T A = +85 ° C
T A = +70 ° C
ON
SHDN
SET
OFF
200
V OUT = 1.8V
R 2
V OUT = 2.5V
V OUT = 3.3V
POK
GND
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
INPUT VOLTAGE (V)
Figure 2. Adjustable Output Using External Feedback
Resistors
POK Output
The power OK (POK) output pulls low when OUT is less
than 93% of the nominal regulation voltage. Once OUT
exceeds 93% of the nominal voltage, POK goes high
impedance. POK is an open-drain N-channel output. To
obtain a voltage output, connect a pullup resistor from
POK to OUT. A 100k Ω resistor works well for most appli-
cations. POK can be used as a power-okay (POK) signal
to a microcontroller (μC), or drive an external LED to indi-
cate power failure. When the MAX1818 is shut down,
POK is held low independent of the output voltage. If
unused, leave POK grounded or unconnected.
Current Limit
The MAX1818 monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 0.8A
(typ). This current limit doubles when the output voltage
is within 4% of the nominal value to improve perfor-
mance with large load transients.
Thermal Overload Protection
Thermal overload protection limits total power dissipa-
tion in the MAX1818. When the junction temperature
exceeds T J = +170°C, a thermal sensor turns off the
pass transistor, allowing the IC to cool. The thermal
sensor turns the pass transistor on again after the junc-
tion temperature cools by 20°C, resulting in a pulsed
output during continuous thermal overload conditions.
Thermal overload protection protects the MAX1818 in
the event of fault conditions. For continuous operation,
Figure 3. Power Operating Regions: Maximum Output vs.
Supply Voltage
do not exceed the absolute maximum junction-temper-
ature rating of T J = +150°C.
Operating Region and Power Dissipation
The MAX1818’s maximum power dissipation depends
on the thermal resistance of the IC package and circuit
board, the temperature difference between the die
junction and ambient air, and the rate of air flow. The
power dissipated in the device is P = I OUT × (V IN -
V OUT ). The maximum allowed power dissipation is
800mW at T A = +70°C or:
P MAX = (T J(MAX) - T A ) / ( θ JC + θ CA )
where T J - T A is the temperature difference between
the MAX1818 die junction and the surrounding air, θ JC
is the thermal resistance of the junction to the 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 best heatsinking, the
copper area should be equally shared between the IN,
OUT, and GND pins.
The MAX1818 delivers up to 0.5A RMS and operates
with input voltages up to +5.5V, but not simultaneously.
High output currents can only be sustained when input-
output differential voltages are low, as shown in Figure 3.
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相关代理商/技术参数 |
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| MAX1818EUT33 | 制造商:Maxim Integrated Products 功能描述:100MA LOW DROPOUT LINEAR REGULATOR IN HIGH PO - Bulk |
| MAX1818EUT33#G16 | 制造商:Maxim Integrated Products 功能描述:LDO REG 1.25V TO 5V/3.3V 0.5A 6PIN SOT-23 - Bulk |
| MAX1818EUT33#TG16 | 功能描述:低压差稳压器 - LDO 500mA 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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| MAX1818EUT33+T | 功能描述:低压差稳压器 - LDO 500mA 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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