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| 型号： | MAX1792EUA25+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V/ADJ .5A 8-UMAX |
| 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 |
| 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： | 带卷 (TR) |
500mA Low-Dropout
Linear Regulator in μMAX
Reset Output
The reset output ( RST ) pulls low when OUT is less than
IN
OUT
R1 = R2
V OUT
1.25V
-1
93% of the nominal regulation voltage. Once OUT
exceeds 93% of the nominal voltage, RST goes high
impedance after 4ms. RST is an open-drain N-channel
V IN = +2.5V TO +5.5V
C IN
1 μ F
IN
MAX1792
OUT
C OUT
3.3 μ F
R 1
V OUT
output. To obtain a voltage output, connect a pullup
resistor from RST to OUT. A 100k Ω resistor works well for
most applications. RST can be used as a power-on-reset
(POR) signal to a microcontroller (μC), or drive an exter-
nal LED to indicate power failure. When the MAX1792 is
shut down, RST is held low independent of the output
ON
OFF
SHDN
SET
voltage. If unused, leave RST grounded or unconnected.
Current Limit
The MAX1792 monitors and controls the pass transis-
R 2
tor’s gate voltage, limiting the output current to 0.8A
(typ). This current limit doubles when the output voltage
RST
GND
is within 4% of the nominal value to improve perfor-
mance with large load transients. The output can be
shorted to ground for an indefinite period of time with-
out damaging the part.
Figure 2. Adjustable Output Using External Feedback
Resistors
The MAX1792 does not suffer from these problems and
consumes only 110μA of quiescent current under
heavy loads as well as in dropout.
Output Voltage Selection
The MAX1792’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
MAX1792EUA33 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 current
drops to 0.1μA. When in shutdown, RST pulls low and
OUT is discharged through an internal 5k Ω resistor. 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.
Thermal Overload Protection
Thermal overload protection limits total power dissipa-
tion in the MAX1792. When the junction temperature
exceeds T J = +170°C, a thermal sensor turns off the
pass transistor, allowing the device 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 MAX1792 in
the event of fault conditions. For continuous operation,
do not exceed the absolute maximum junction-temper-
ature rating of T J = +150°C.
Operating Region and
Power Dissipation
The MAX1792’s maximum power dissipation depends on
the thermal resistance of the IC package and circuit
board, the temperature difference between the die junc-
tion and ambient air, and the rate of air flow. The power
dissipated in the device is P = I OUT x (V IN - V OUT ). The
maximum allowed power dissipation is 1.3W or:
P MAX = (T J(MAX) - T A ) / ( θ JC + θ CA )
where T J - T A is the temperature difference between
the MAX1792 die junction and the surrounding air, θ JC
is the thermal resistance from 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.
The MAX1792 package features an exposed thermal
pad on its underside. This pad lowers the thermal resis-
tance of the package by providing a direct heat con-
8
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相关代理商/技术参数 |
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|---|---|
| MAX1792EUA25-TG068 | 制造商:Maxim Integrated Products 功能描述:8 PINS UMAX PKG PART MARK: AAAB - Bulk |
| MAX1792EUA25-TG069 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1792EUA33 | 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 |
| MAX1792EUA33/V+ | 制造商:Maxim Integrated Products 功能描述:500MA, LOW-DROPOUT LINEAR REGULATOR IN UMAX - Rail/Tube |
| MAX1792EUA33/V+T | 制造商:Maxim Integrated Products 功能描述:500MA, LOW-DROPOUT LINEAR REGULATOR IN UMAX - Tape and Reel |
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