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| 型号： | MAX6473TA18BD3+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V/ADJ .3A 8-TDFN |
| 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： | 1.8V，1.25 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA（最小） |
| 电流 - 限制（最小）： | 450mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
300mA LDO Linear Regulators with Internal
Microprocessor Reset Circuit
cool. The thermal sensor turns the pass transistor on
again after the IC’s junction temperature cools by 20°C,
resulting in a pulsed output during continuous thermal
overload conditions. Thermal overload protection is
designed to protect the MAX6469 –MAX6484 in the
event of fault conditions. For continuous operation, do
not exceed the absolute maximum junction temperature
rating of T JMAX = +150°C.
Operating Region and Power Dissipation
The MAX6469–MAX6484’s maximum power dissipation
depends on the thermal resistance of the case and cir-
cuit board, the temperature difference between the die
junction and the ambient air, and the rate of airflow. The
power dissipation across the device is:
P = I OUT (V IN - V OUT )
The maximum power dissipation is:
P MAX = (T J - T A ) / (? JB + ? BA )
where T J - T A is the temperature difference between the
die junction and the surrounding air, ? JB (or ? JC ) is the
thermal resistance of the package, and ? BA is the ther-
mal resistance through the PC board, copper traces,
and other materials to the surrounding air. The
MAX6469–MAX6476 TDFN package ? JC = 41°C/W,
and the MAX6469 –MAX6476 SOT package ? JC =
110°C/W.
The MAX6469–MAX6484’s ground pin (GND) performs
the dual function of providing an electrical connection
to the system ground and channeling heat away.
Connect GND to the system ground using a large pad
or ground plane. For continuous operation, do not
exceed the absolute maximum junction temperature
rating of T JMAX = +150°C.
Applications Information
Output Voltage Selection
The MAX6469–MAX6484 feature dual-mode operation:
they operate in either a preset output voltage mode
or an adjustable mode. In preset voltage mode, internal
feedback resistors set the MAX6469–MAX6484’s output
from +1.5V to +3.3V (Table 1). Select this mode by con-
necting SET to ground (MAX6469 –MAX6472/
MAX6477–MAX6480). In adjustable mode, select an
output between 1.25V and 5.5V using two external
resistors connected as a voltage-divider to SET (Figure
1). The output voltage is set by the following equation:
V OUT = V SET (1 + R 1 / R 2 )
where V SET = 1.23V. To simplify resistor selection:
R 1 = R 2 (V OUT / V SET - 1)
Choose R2 = 50k ? to maintain stability, accuracy and
high-frequency power-supply rejection. Avoid selecting
resistor values greater than 100k ? . In preset voltage
mode, the impedance between SET and ground should
always be less than 50k ? . In most applications, con-
nect SET directly to ground.
Low-Noise UCSP Output
MAX6477–MAX6484 UCSP products include internal fil-
tering to yield low output noise without an additional
external bypass capacitor. The devices yield 75μV RMS
(typ) output noise (for V OUT = 3.0V) and 150μV RMS (for
V OUT = 3.3V). This low-noise feature makes the
MAX6477–MAX6484 ideal for audio applications.
Capacitor Selection and Regulator
Stability
For stable operation over the full temperature range
and with load currents up to 300mA, use a 3.3μF (min)
ceramic output capacitor with an ESR <0.2 ? . To
reduce noise and improve load transient response, sta-
bility, and power-supply rejection, use large output
capacitor values such as 10μF.
Note that some ceramic capacitors exhibit large capac-
itance and ESR variation with temperature. With capaci-
tor dielectrics such as Z5U and Y5V, use 4.7μF or more
to ensure stability over temperature. With X7R or X5R
capacitor dielectrics, 3.3μF should be sufficient at all
operating temperatures. Higher ESR capacitors require
more capacitance to maintain stability. A graph of the
Region of Stable ESR vs. Load Current is shown in the
Typical Operating Characteristics.
To improve power-supply rejection and transient
response, use a 1μF capacitor between IN and GND.
The MAX6469 –MAX6484 remain stable with purely
resistive loads or current loads up to 300mA.
Reset Transient Immunity
The reset circuit is relatively immune to short-duration,
falling V OUT transients. The Typical Operating
Characteristics section shows a graph of the Maximum
Transient Duration vs. Reset Threshold Overdrive for
which reset is not asserted. The graph was produced
using falling V OUT transients starting at V OUT and end-
ing below the reset threshold by the magnitude indicat-
ed (reset threshold overdrive). The graph shows the
maximum pulse width that a falling V OUT transient can
typically have without triggering a reset pulse. As the
amplitude of the transient increases (i.e., goes further
below the reset threshold), the maximum allowable
pulse width decreases. Typically, a V OUT transient that
goes only 10mV below the reset threshold and lasts for
75μs does not trigger a reset pulse.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6473TA18BD4+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 |
| MAX6473TA18BD4-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 |
| MAX6473TA19AD1+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 |
| MAX6473TA19AD1-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 |
| MAX6473TA19AD2+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 |
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