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| 型号： | MAX1792EUA18+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V/ADJ .5A 8-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 1.8V，1.25 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 8-uMax-EP |
| 包装： | 管件 |
| 产品目录页面： | 1410 (CN2011-ZH PDF) |
500mA Low-Dropout
Linear Regulator in μMAX
V IN = +2.5V TO +5.5V
IN
C IN
1 μ F
IN
MOSFET
DRIVER WITH
I LIM
THERMAL
SENSOR
OUT
V OUT = 1.25V TO 5.0V
ON
SHDN
OUT
C OUT
3.3 μ F
OFF
LOGIC SUPPLY
SHUTDOWN
LOGIC
ERROR
AMPLIFIER
V REF
1.25V
5k
R1
VOLTAGE (V OUT )
R RST
100k
MAX1792
TO
μ C
RST
DELAY
TIMER
93% V REF
100mV
SET
R2
GND
Figure 1. Functional Diagram
Detailed Description
The MAX1792 is a low-dropout, low-quiescent-current
linear regulator designed primarily for battery-powered
applications. The device supplies loads up to 500mA
and is available with preset output voltages. As illustrat-
ed in Figure 1, the MAX1792 consists of a 1.25V refer-
ence, error amplifier, P-channel pass transistor, and
internal feedback voltage-divider.
The 1.25V reference is connected to the error amplifier,
which compares this reference with the feedback volt-
age and amplifies the difference. If the feedback volt-
age is lower than the reference voltage, the
pass-transistor gate is pulled lower, which allows more
current to pass to the output and increases the output
voltage. If the feedback voltage is too high, the pass-
transistor gate is pulled up, allowing less current to
pass to the output.
The output voltage is fed back through either an inter-
nal resistive divider connected to OUT or an external
resistor network connected to SET. The Dual Mode
comparator examines V SET and selects the feedback
path. If V SET is below 50mV, the internal feedback path
is used and the output is regulated to the factory-preset
voltage.
Additional blocks include an output current limiter, ther-
mal sensor, and shutdown logic.
Internal P-Channel Pass Transistor
The MAX1792 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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1792EUA18/V+ | 制造商:Maxim Integrated Products 功能描述:500MA, LOW-DROPOUT LINEAR REGULATOR IN UMAX - Rail/Tube |
| MAX1792EUA18/V+T | 制造商:Maxim Integrated Products 功能描述:500MA, LOW-DROPOUT LINEAR REGULATOR IN UMAX - Tape and Reel |
| MAX1792EUA18+ | 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 |
| MAX1792EUA18+ | 制造商:Maxim Integrated Products 功能描述:IC LDO REG 1.8V 500MA. 8UMAX |
| MAX1792EUA18+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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