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| 型号： | MAX5091AASA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .1A 8-SOIC |
| 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 28V |
| 电压 - 压降（标准）： | 0.3V @ 100mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 100mA |
| 电流 - 限制（最小）： | 160mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOICN 裸露焊盘 |
| 包装： | 带卷 (TR) |
28V, 100mA, Low-Quiescent-Current LDO
with Reset and Power-Fail Input/Output
V TRIP =
+ V ST
+ ( 35 × 10 ? 6 )
t RD =
Detailed Description
Regulator
The MAX5091 high-voltage, LDO regulator operates
from +5V to +28V input voltage. The device withstands
up to 40V transients, providing protection against tem-
porary overvoltage conditions like load dump. The
MAX5091 incorporates internal feedback resistors for
factory-preset voltages of either +5V (MAX5091A) or
+3.3V (MAX5091B). The regulator is capable of driving
up to 100mA of load current and features a typical cur-
rent limit of 260mA. The regulator uses a pnp pass ele-
ment and provides low 0.5V dropout while delivering
100mA load current. The output of the regulator follows
closely to the input during turn-on. See the Output
Voltage vs. Input Voltage graph in the Typical
Operating Characteristics . This makes the usable input
voltage range for 3.3V and 5V output down to 3.7V and
5.5V, respectively. The MAX5091 is designed to oper-
ate with very low quiescent current during always-on
operation when not in dropout. The regulator is stable
with a wide variety of capacitors including low-ESR
ceramic 10μF (0603 case size). The load-transient
response curves depict the stability of the LDO when
using different capacitance and ESR ranges. See the
Capacitor Selection and Regulator Stability section in
the Applications Information .
Reset Output ( RES )
The MAX5091 integrates a power-on-reset circuit. RES
is an open-drain output that requires a pullup resistor to
V OUT . The open-drain MOSFET can sink up to 825μA
current while keeping the RES voltage below 0.4V. The
internal reset circuit monitors the regulator output volt-
age and RES asserts an active-low output when the
regulator output falls below a reset threshold of typical-
ly 0.9 x V OUT . The RES output remains low when V OUT
is below the reset threshold, and remains low for the
duration of the reset timeout period (t RD ). The reset
timeout period is programmable and can be set with an
external capacitor connected from CT to ground. The
duration of the delay as a function of CT is:
C CT × V CCTH
I CT
where V CCTH = 2 . 1 V and I CT = 2 × 10 ? 6 A .
The default reset timeout period is 35μs when no
capacitor is connected from CT to ground.
SI/SO Comparator
The MAX5091 includes an uncommitted comparator for
monitoring the input voltage or for detecting power-fail
conditions. The input SI is the noninverting input of the
comparator. The open-drain output SO asserts low
when voltage at the input SI drops below the threshold
voltage, V ST (see Figure 1). The sense comparator typi-
cally has a hysteresis of 100mV. Use the following
equation to calculate the resistor-divider for program-
ming the trip voltage (V TRIP ) during power-fail. See the
Typical Application Circuit .
(V ST × R H )
R L
where V ST = 1.16V (typ). Choose R L between 100k Ω to
300k Ω .
Enable Input
The enable (EN) is a TTL-compatible logic input. Logic
low at EN turns off the regulator and reduces the cur-
rent consumption to 17μA (typ). It is internally pulled up
to a logic-high voltage (3.6V max) by an internal resis-
tor. Thus, the MAX5091 is enabled by default when V S
is applied and EN is left unconnected. The regulator,
reset supervisor circuit, and the sense comparator can
be manually shut down by pulling EN low. For shut-
down operation, the pulldown network must be capable
of sinking 3μA max, since the internal pullup resistor
sets the maximum pullup current at 3μA. The external
pulldown device should not leak more than 1μA current
when it is in the off-state.
Current Limit
The MAX5091 features a current limiter that monitors
the output current and controls the pass transistor’s
gate voltage, limiting the output current to typically
260mA. The output can be continuously shorted to
ground without damaging the device at V S ≤ 16V. Note
that the output short-circuit current may increase the
power dissipation significantly and raise the junction
temperature to its thermal-shutdown threshold. In such
a case, the MAX5091 is temporarily turned off.
Thermal Shutdown
When the junction temperature exceeds T J = +165°C
(typ), an internal thermal sensor signals the shutdown
logic to turn off the pass transistor and allow the IC to
cool. The thermal sensor turns the pass transistor on
again after the IC ’s junction temperature cools by
+20°C (typ), resulting in a cycled output during contin-
uous thermal-overload conditions. Thermal shutdown
protects the MAX5091 in the event of fault conditions.
For continuous operation, do not exceed the absolute
maximum junction temperature of T J = +150°C.
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5091AATA+ | 制造商:Maxim Integrated Products 功能描述:28V, 100MA, LOW-QUIESCENT-CURRENT LDO WITH RESET AND POWER-F - Rail/Tube |
| MAX5091AATA+T | 功能描述:低压差稳压器 - LDO 28V 100mA Low-Q 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 |
| MAX5091BASA+ | 功能描述:低压差稳压器 - LDO 28V 100mA Low-Q 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 |
| MAX5091BASA+T | 功能描述:低压差稳压器 - LDO 28V 100mA Low-Q 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 |
| MAX5091BATA+ | 制造商:Maxim Integrated Products 功能描述:REG LDO LIN FIX POS 3.3V 0.1A 8TDFN EP - Rail/Tube |
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