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参数资料
| 型号： | MAX5087BATE/V+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V/ADJ .4A 16-TQFN |
| 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： | 5V，2.5 V ~ 11 V |
| 输入电压： | 6.5 V ~ 45 V |
| 电压 - 压降（标准）： | 0.9V @ 400mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 400mA（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
MAX5087
45V, 400mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
Detailed Description
The MAX5087 high-voltage linear regulator includes an
integrated μP reset circuit with an adjustable reset time-
out period (see the Adjustable Reset Timeout Period
(CT) section). The device guarantees a 400mA load
current and is available with a preset output voltage of
3.3V (MAX5087A) or 5V (MAX5087B). Both devices can
be configured to provide an adjustable output voltage
6.5V TO 45V
47 μ F
ON
OFF
IN
EN
OUT
MAX5087
OUTSENSE
R1
2.5V TO 11V
15 μ F
from 2.5V to 11V. The internal reset circuit monitors the
regulator output voltage and asserts RESET low when the
TO μ P
RESET
regulator output falls below the reset threshold voltage.
Other features include an enable (regulator control input),
21μA (max) shutdown current, short-circuit protection
(see the Output Short-Circuit Current Limit section), and
thermal shutdown (see the Thermal Protection section).
Regulator
The MAX5087 accepts an input voltage range from
C CT
CT
GND
SET
R2
V OUT = V SET (1 + R1 / R2)
V SET = 1.235V
6.5V to 45V and offers a fixed output voltage of 3.3V or
5V. For an adjustable output voltage operation, use an
external resistive divider network connected between
OUT, SET, and GND (see Figure 2).
Enable Input (EN)
EN is a logic-level enable input that turns the device
on/off. Drive EN high to turn on the device and drive EN
low to place the device in shutdown. The MAX5087
draws 11μA (typ) of supply current when in shutdown.
EN withstands voltages up to +45V, allowing EN to be
connected to IN for an always-on operation.
Remote Sensing (OUTSENSE)
The 3.3V (MAX5087A) and 5V (MAX5087B) output volt-
age versions connect OUTSENSE for load voltage
sensing. Leave OUTSENSE open when using
adjustable output voltage version.
Reset Output ( RESET )
A supervisor circuit is fully integrated in the MAX5087
and uses the same reference voltage as the regulator.
RESET goes low if V OUT drops below the preset output
voltage threshold, and remains low at least for the time-
out period after V OUT rises above the reset voltage
threshold.
Adjustable Reset Timeout Period (CT)
The MAX5087 features a user-adjustable reset timeout.
Connect a capacitor from CT to GND to set the reset
8
Figure 2. Setting the Adjustable Output Voltage
timeout period (see Figure 2) and use the following
equation to calculate the timeout period:
t RP = C CT x 0.6175 x 10 6 (s)
where C CT is the value of the external capacitor con-
nected from CT to GND.
Thermal Protection
When the junction temperature exceeds T J = +175°C,
an internal thermal sensor signals the shutdown logic,
which turns off the pass transistor, allowing the IC to
cool. The thermal sensor turns the pass transistor on
again after the IC’s junction temperature cools by 25°C,
resulting in a cycled output during continuous thermal-
overload conditions. Thermal protection protects the
MAX5087 in the event of fault conditions. During contin-
uous operation, do not exceed the absolute maximum
junction temperature rating of T J = +150°C.
Output Short-Circuit Current Limit
The MAX5087 features a current limit. The output can
be shorted to GND for an indefinite period of time (for
V IN < 14V) without damage to the device. Continuous
output short-circuit protection is only guaranteed for
V IN < 14V.
Maxim Integrated
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