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| 型号： | MAX8867EZK50+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .15A TSOT23-5 |
| 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 |
| 输出电压： | 5V |
| 输入电压： | 最高 6.5V |
| 电压 - 压降（标准）： | 0.165V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA（最小） |
| 电流 - 限制（最小）： | 160mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 带卷 (TR) |
Low-Noise, Low-Dropout,
150mA Linear Regulators in SOT23
An external bypass capacitor connected to the BP pin
reduces noise at the output. Additional blocks include a
current limiter, reverse battery protection, thermal sen-
sor, and shutdown logic. The MAX8868 also includes
an auto-discharge function, which actively discharges
the output voltage to ground when the device is placed
in shutdown mode.
Output Voltage
The MAX8867/MAX8868 are supplied with factory-set
output voltages from 2.5V to 5V, in 100mV increments.
Except for the MAX886 E_K29 and the MAX886 E_K32
(which have an output voltage preset at 2.84V and
3.15V, respectively), the two-digit suffix allows the cus-
tomer to choose the output voltage in 100mV increments.
For example, the MAX8867EUK33 has a preset output
voltage of 3.3V. (see Expanded Ordering Information ).
Internal P-Channel Pass Transistor
The MAX8867/MAX8868 feature a 1.1 ? typical P-chan-
nel MOSFET pass transistor. This provides several
advantages over similar designs using PNP pass tran-
sistors, including longer battery life. The P-channel
MOSFET requires no base drive, which reduces quies-
cent current considerably. PNP-based regulators waste
considerable current in dropout when the pass transis-
tor saturates. They also use high base-drive currents
under large loads. The MAX8867/MAX8868 do not suf-
fer from these problems and consume only 100μA of
quiescent current whether in dropout, light-load, or
heavy-load applications (see the Typical Operating
Characteristics ).
Current Limit
The MAX8867/MAX8868 include a current limiter, which
monitors and controls the pass transistor’s gate voltage,
limiting the output current to 390mA. For design purposes,
consider the current limit to be 160mA minimum to 500mA
maximum. The output can be shorted to ground for an
indefinite amount of time without damaging the part.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX8867/MAX8868. When the junction tem-
perature exceeds T J = +170°C, the thermal sensor
signals the shutdown logic, turning off the pass transis-
tor and allowing the IC to cool. The thermal sensor will
turn 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
MAX8867/MAX8868 in the event of fault conditions. For
continual operation, do not exceed the absolute maxi-
mum junction-temperature rating of T J = +150°C.
Operating Region and Power Dissipation
The MAX8867/MAX8868’s maximum power dissipation
depends on the thermal resistance of the case and cir-
cuit board, the temperature difference between the die
junction and ambient air, and the rate of air flow. 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 ) / ( θ JB + θ BA )
where T J - T A is the temperature difference between the
MAX8867/MAX8868 die junction and the surrounding
air, θ JB (or θ JC ) is the thermal resistance of the pack-
age, and θ BA is the thermal resistance through the
printed circuit board, copper traces, and other materi-
als to the surrounding air.
The GND pin of the MAX8867/MAX8868 performs the
dual function of providing an electrical connection to
ground and channeling heat away. Connect the GND
pin to ground using a large pad or ground plane.
Reverse Battery Protection
The MAX8867/MAX8868 have a unique protection
scheme that limits the reverse supply current to 1mA
when either V IN or V SHDN falls below ground. Their cir-
cuitry monitors the polarity of these two pins and dis-
connects the internal circuitry and parasitic diodes
when the battery is reversed. This feature prevents
device damage.
Noise Reduction
An external 0.01μF bypass capacitor at BP, in conjunction
with an internal 200k ? resistor, creates an 80Hz lowpass
filter for noise reduction. The MAX8867/MAX8868 exhibit
30μV RMS of output voltage noise with C BP = 0.01μF
and C OUT = 10μF. Start-up time is minimized by a
power-on circuit that pre-charges the bypass capacitor.
The Typical Operating Characteristics show graphs of
Noise vs. BP Capacitance, Noise vs. Load Current, and
Output Noise Spectral Density.
__________Applications Information
Capacitor Selection and Regulator Stability
Normally, use a 1μF capacitor on the MAX8867/
MAX8868’s input and a 1μF to 10μF capacitor on the
output. Larger input capacitor values and lower ESRs
provide better supply-noise rejection and line-transient
response. Reduce noise and improve load-transient
response, stability, and power-supply rejection by
using large output capacitors. For stable operation over
the full temperature range and with load currents up to
150mA, a minimum of 1μF is recommended. Note that
some ceramic dielectrics exhibit large capacitance and
ESR variation with temperature. With dielectrics such as
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| MAX8868ETEQ+ | 功能描述:低压差稳压器 - LDO 2MHz Dual Step-Down DC/DC Converter 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 |
| MAX8868ETEU+ | 功能描述:低压差稳压器 - LDO 2MHz Dual Step-Down DC/DC Converter 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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