MAX883ESA+T Maxim Integrated Products, MAX883ESA+T Datasheet - Page 11

• Manufacturer Part Number: MAX883ESA+T
• Description: IC REG LINEAR 5/ADJ 200MA 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX883ESA+T

• Regulator Topology: Positive Fixed or Adjustable
• Voltage - Output: 5V, 1.25 ~ 11 V
• Voltage - Input: 2.9 ~ 11.5 V
• Voltage - Dropout (typical): 0.22V @ 200mA
• Number Of Regulators: 1
• Current - Output: 200mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 11.5 V
• Output Voltage: 1.25 V to 11 V, 5 V
• Output Type: Adjustable, Fixed
• Dropout Voltage (max): 0.22 V at 100 mA
• Output Current: 200 mA
• Line Regulation: 40 mV
• Load Regulation: 100 mV
• Voltage Regulation Accuracy: 5 %
• Maximum Power Dissipation: 1.5 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Reference Voltage: 1.24 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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
Reverse-current protection activates when the voltage
on IN falls 6mV (or 20mV max) below the voltage on
OUT. Before this happens, currents as high as several
milliamperes can flow back through the device.
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 (max), so R2 can be as large as 1MΩ. Add extra
noise immunity by connecting a small capacitor from LBI
to GND. Additional hysteresis can be added by connect-
ing a high-value resistor from LBI to LBO.
Figure 6. Using the Low-Battery Comparator to Monitor Battery
Voltage
BATTERY
O.1µF
V
C
LBI TRIP
Low-Battery-Detection Comparator
IN
( ) ARE FOR MAX882.
R1
R2
= V
LBI
OUT
R1 + R2
______________________________________________________________________________________
R2
Reverse-Current Protection
OFF (STBY)
= 3.3V and 50µA at V
IN
LBI
, V
GND
LBI
= 1.20V
MAX882
MAX883
MAX884
5V/3.3V or Adjustable, Low-Dropout,
SET
Low I
LBO
OUT
POWER-
FAIL
INDICATION
OUT
R3
= 5V.
VOLTAGE
Q
OUTPUT
C
2.2µF
OUT
, 200mA Linear Regulators
The MAX882/MAX883/MAX884 are series linear regula-
tors designed primarily for battery-powered systems.
Figure 7 shows a typical application.
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 approximately 7µA.
Standby mode is useful in applications where a low-
battery comparator 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.
An output filter capacitor is required at the MAX882/
MAX883/MAX884 OUT pin. The minimum output
capacitance required for stability is 2.2µF.
Figure 7. Typical 3.3V or 5V Linear Regulator Circuit
* OPTIONAL REVERSE BATTERY PROTECTION
VOLTAGE
BATTERY
INPUT
ON/OFF
O.1µF
( ) ARE FOR MAX882.
C
*
IN
Applications Information
Standby Mode vs. OFF Mode
Output Capacitor Selection
OFF (STBY)
IN
LBI
SET
and Regulator Stability
MAX882
MAX883
MAX884
GND
OUT
VOLTAGE
OUTPUT
C
2.2µF
OUT
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