MAX883C MAXIM [Maxim Integrated Products], MAX883C Datasheet - Page 8

• Manufacturer Part Number: MAX883C
• Description: 5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators
• Manufacturer: MAXIM [Maxim Integrated Products]

In adjustable mode, the user selects an output voltage
in the 1.25V to 11V range by connecting two external
resistors, used as a voltage-divider, to the SET pin
(Figure 2).
The output voltage is set by the following equation:
where V
To simplify resistor selection:
Since the input bias current at SET is nominally zero,
large resistance values can be used for R1 and R2 to
minimize power consumption without losing accuracy.
Up to 1.5MΩ is acceptable for R2. Since the V
ance is less than ±40mV, the output can be set using
fixed resistors instead of trim pots.
5V/3.3V or Adjustable, Low-Dropout,
Low I
Figure 1. MAX882/MAX883/MAX884 Functional Diagram
8
_______________________________________________________________________________________
(STBY)
SET
GND
LBO
OFF
LBI
IN
( ) ARE FOR MAX882.
= 1.20V.
Q
N
V
OUT
, 200mA Linear Regulators
R1
=
=
V
R2
SET
LOW-BATTERY
COMPARATOR
SHUT-
DOWN
LOGIC
THERMAL
SENSOR
⎛
⎜
⎝
⎛
⎜
⎝
V
1
V
OUT
SET
+
R
R
REFERENCE
2
1
−
1.20V
⎞
⎟
⎠
1
⎞
⎟
⎠
SET
toler-
ERROR AMP
The MAX882 has a standby feature that disconnects
the input from the output when STBY is brought low, but
keeps all other circuitry awake. In this mode, V
drops to 0, and the internal biasing circuitry (including
the low-battery comparator) remains on. The maximum
quiescent current during standby is 15µA. STBY is a
comparator input with the other input internally tied to
the reference voltage. Use a resistor network as shown
in Figure 3 to set a standby-mode threshold voltage for
undervoltage lockout. Connect STBY to IN for normal
operation.
A low-logic input on the OFF pin shuts down the
MAX883/MAX884. In this mode, the pass transistor,
control circuit, reference, and all biases are turned off,
and the supply current is reduced to less than 1µA.
LBO is undefined in OFF mode. Connect OFF to IN for
normal operation.
COMPARATOR
DUAL-MODE
WITH FOLDBACK
MOSFET DRIVER
CURRENT LIMIT
OFF Mode (MAX883/MAX884)
Standby Mode (MAX882)
65mV
P
R1
R2
PROTECTION
REVERSE-
CURRENT
OUT
SET
OUT