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| 型号： | MAX1818EUT25#T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/9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： | 2,500 |
| 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： | 带卷 (TR) |
500mA Low-Dropout
Linear Regulator in SOT23
V IN = 2.5V TO 5.5V
C IN
1 μ F
IN
MOSFET
DRIVER WITH
I LIM
THERMAL
SENSOR
OUT
V OUT = 1.25V TO 5.0V
ON
SHDN
C OUT
3.3 μ F
OFF
LOGIC SUPPLY
SHUTDOWN
LOGIC
ERROR
AMPLIFIER
V REF
1.25V
5k
R1
VOLTAGE (V OUT )
R POK
100k
MAX1818
TO
μ C
POK
93% V REF
100mV
SET
R2
GND
Figure 1. Functional Diagram
Additional blocks include an output current limiter, ther-
mal sensor, and shutdown logic.
Internal P-Channel Pass Transistor
The MAX1818 features a 0.25 Ω P-channel MOSFET
pass transistor. Unlike similar designs using PNP pass
transistors, P-channel MOSFETs require no base drive,
which reduces quiescent current. PNP-based regula-
tors also waste considerable current in dropout when
the pass transistor saturates, and use high base-drive
currents under large loads. The MAX1818 does not suf-
fer from these problems and consumes only 125μA of
quiescent current under heavy loads as well as in
dropout.
Output Voltage Selection
The MAX1818’s Dual Mode operation allows operation
in either a preset voltage mode or an adjustable mode.
Connect SET to GND to select the preset output volt-
age. The two-digit part number suffix identifies the out-
put voltage (see Selector Guide) . For example, the
MAX1818EUT33 has a preset 3.3V output voltage.
The output voltage may also be adjusted by connecting
a voltage-divider from OUT to SET to GND (Figure 2).
Select R2 in the 25k Ω to 100k Ω range. Calculate R1
with the following equation:
R1 = R2 [(V OUT / V SET ) – 1]
where V SET = 1.25V, and V OUT may range from 1.25V
to 5.0V.
Shutdown
Pull SHDN low to enter shutdown. During shutdown, the
output is disconnected from the input and supply cur-
rent drops to 0.1μA. When in shutdown, POK pulls low
and OUT is high impedance. The capacitance and load
at OUT determine the rate at which V OUT decays.
SHDN can be pulled as high as 6V, regardless of the
input and output voltage.
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX1818EUT33+ | 制造商:Maxim Integrated Products 功能描述:500MA, LOW-DROPOUT LINEAR REGULATOR IN SOT23 - Bulk |
| 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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