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參數(shù)資料
| 型號(hào)： | MAX883 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 5V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators(5V/可調(diào),250mA,具有關(guān)閉方式的,P型溝道低壓差線(xiàn)性穩(wěn)壓器) |
| 中文描述： | 5V/3.3V或可調(diào)、低壓差、低IQ、200mA線(xiàn)性穩(wěn)壓器，具有待機(jī)模式 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大小： | 176K |
| 代理商： | MAX883 |
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M
5V /3.3V or Adjustable, Low-Dropout,
Low I
Q
, 200mA Linear Regulators
______________________________________________________________________________________
13
When operating from sources other than batteries, sup-
ply-noise rejection and transient response can be
improved by increasing the values of the input and out-
put capacitors and employing passive filtering tech-
niques. Do not use power supplies with ripple voltage
exceeding 200mV at 100kHz.
Overshoot and T ransient Considerations
The Typical Operating Characteristics section shows
power-up, supply, and load-transient response graphs.
On the load-transient graphs, two components of the
output response can be observed: a DC shift from the
output impedance due to the different load currents,
and the transient response. Typical transients for step
changes in the load current from 50mA to 250mA are
200mV. Increasing the output capacitor’s value attenu-
ates transient spikes.
During recovery from shutdown, overshoot is negligible
if the output voltage has been given time to decay ade-
quately. During power-up from V
IN
= 0V, overshoot is
typically less than 1% of V
OUT
.
Input-Output (Dropout) V oltage
A regulator’s minimum input-output voltage differential
(or dropout voltage) determines the lowest usable sup-
ply voltage. In battery-powered systems, this deter-
mines the useful end-of-life battery voltage. Because
the MAX882/MAX883/MAX884 use a P-channel MOS-
FET pass transistor, their dropout voltage is a function
of R
DS(ON)
multiplied by the load current (see Electrical
Characteristics). Quickly stepping up the input voltage
from the dropout voltage can result in overshoot.
S hort-T erm Battery Bac kup
Using the MAX 882
Figure 9 illustrates a scheme for implementing battery
backup for 3.3V circuits using the MAX882. When the
supply voltage drops below some user-specified value
based on resistors R1 and R2, the standby function
activates, turning off the MAX882’s output. Under
these conditions, the backup battery supplies power to
the load. Reverse current protection prevents the bat-
tery from draining back through the regulator to the
input.
This application is limited to short-term battery backup
for 3.3V circuits. The current drawn by the MAX882’s
OUT pin at 3.3V during reverse current protection is
typically 8μA. It should not be used with the MAX883
and MAX884, since the OFF pin is a logic input, and
indeterminate inputs can cause the regulator to turn on
intermittently, draining the battery.
Reverse Battery Protec tion
Reverse battery protection can be added by including
an inexpensive Schottky diode between the battery
input and the regulator circuit, as shown in Figure 7.
However, the dropout voltage of the regulator will be
increased by the forward voltage drop of the diode. For
example, the forward voltage of a standard 1N5817
Schottky diode is typically 0.29V at 200mA.
BACKUP
BATTERY
MAX882
C
IN
O.1
μ
F
C
OUT
2.2
μ
F
OUTPUT
VOLTAGE
INPUT
VOLTAGE
LBI
SET
STBY
IN
D2
R1
R2
OUT
GND
Figure 9. Short-Term Battery Backup Using the MAX882
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX882 | 3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators(3.3V/可調(diào),250mA,具有維持方式,P溝道低壓差線(xiàn)性穩(wěn)壓器) |
| MAX8862 | Low-Cost, Low-Dropout, Dual Linear Regulator |
| MAX8862_ESE | RES 160K OHM 1/16W 5% 0402 SMD |
| MAX8863T | Low-Dropout, 100mA Linear Regulators(100mA,低壓差線(xiàn)性穩(wěn)壓器,SOT23封裝) |
| MAX8863R | Low-Dropout, 100mA Linear Regulators(100mA,低壓差線(xiàn)性穩(wěn)壓器,SOT23封裝) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8830EWE+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8830EWE+T | 功能描述:LED照明驅(qū)動(dòng)器 LED Light Management IC RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX8831EVKIT+ | 功能描述:LED 照明開(kāi)發(fā)工具 High Efficiency White LED Step-Up Converter with I2C Interface in 2mm x 2mm WLP RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
| MAX8831EWE+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX8831EWE+T | 功能描述:LED照明驅(qū)動(dòng)器 White LED Step-Up Converter RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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