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參數(shù)資料
| 型號(hào)： | MAX882 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators(3.3V/可調(diào),250mA,具有維持方式,P溝道低壓差線性穩(wěn)壓器) |
| 中文描述： | 5V/3.3V或可調(diào)、低壓差、低IQ、200mA線性穩(wěn)壓器，具有待機(jī)模式 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 176K |
| 代理商： | MAX882 |
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M
5V /3.3V or Adjustable, Low-Dropout,
Low I
Q
, 200mA Linear Regulators
______________________________________________________________________________________
11
Reverse-Current Protec tion
The MAX882/MAX883/MAX884 have a unique protection
scheme that limits reverse currents when the input volt-
age falls below the output. It monitors the voltages on IN
and OUT and switches the IC’s substrate and power bus
to the more positive of the two. The control circuitry is
then able to remain functioning and turn the pass transis-
tor off, limiting reverse currents back through to the input
of the device. In this mode, typical current into OUT to
GND is 15μA at V
OUT
= 3.3V and 50μA at V
OUT
= 5V.
Reverse-current protection activates when the voltage
on IN falls 6mV (or 20mV maximum) below the voltage
on OUT. Before this happens, currents as high as sev-
eral milliamperes can flow back through the device.
Low-Battery-Detec tion Comparator
The MAX882/MAX883/MAX884 provide a low-battery com-
parator that compares the voltage on the LBI pin to the
1.20V internal reference. LBO, an open-drain output, goes
low when LBI is below 1.20V. Hysteresis of 7mV has been
added to the low-battery comparator to provide noise
immunity during switching. LBO remains functional in stand-
by mode for the MAX882, but is undefined in OFF mode for
the MAX883 and MAX884. Tie LBI to IN when not used.
Use a resistor-divider network as shown in Figure 6 to set
the low-battery trip voltage. Current into the LBI input is
±50nA maximum, so R2 can be as large as 1M
. Add
extra noise immunity by connecting a small capacitor
from LBI to GND. Additional hysteresis can be added by
connecting a high-value resistor from LBI to LBO.
__________Applic ations Information
The MAX882/MAX883/MAX884 are series linear regula-
tors designed primarily for battery-powered systems.
Figure 7 shows a typical application.
S tandby Mode vs. OFF Mode
STBY is a comparator input that allows the user to set
the standby-mode threshold voltage, while OFF is a
logic-level input. When in standby mode, the output is
disconnected from the input, but the biasing circuitry
(including the low-battery comparator) is kept alive,
causing the device to draw around 7μA. Standby mode
is useful in applications where a low-battery compara-
tor function is still needed in shutdown.
A logic low at the OFF pin turns off all biasing circuitry,
including the LBI/LBO comparator, and reduces supply
current to less than 1μA. OFF mode is useful for maxi-
mizing battery life. There is little difference in the time it
takes to exit standby mode or OFF mode.
Output Capac itor S elec tion
and Regulator S tability
An output filter capacitor is required at the MAX882/
MAX883/MAX884 OUT pin. The minimum output
capacitance required for stability is 2.2μF.
MAX882
MAX883
MAX884
SET
C
IN
O.1
μ
F
C
OUT
2.2
μ
F
OUTPUT
VOLTAGE
BATTERY
LBO
LBI
OFF (STBY)
( ) ARE FOR MAX882
IN
POWER-
FAIL
INDICATION
R3
R1 + R2
R2
V
LBI TRIP
= V
LBI
, V
LBI
= 1.20V
OUT
GND
R1
R2
MAX882
MAX883
MAX884
GND
C
IN
O.1
μ
F
C
OUT
2.2
μ
F
OUTPUT
VOLTAGE
INPUT
VOLTAGE
BATTERY
OFF (STBY)
ON/OFF
*
* OPTIONAL REVERSE BATTERY PROTECTION
( ) ARE FOR MAX882
IN
OUT
SET
LBI
Figure 6. Using the Low-Battery Comparator to Monitor Battery
Voltage
Figure 7. Typical 3.3V or 5V Linear Regulator Circuit
*Tie LBI to IN when not used.
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