MAX8873T Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Low-Dropout, 120mA Linear Regulators

19-1257; Rev 1; 3/98
Low-Dropout, 120mA Linear Regulators
_______________General Description
The MAX8873T/S/R and MAX8874T/S/R low-dropout lin-
ear regulators operate from a +2.5V to +6.5V input
range and deliver up to 120mA. A PMOS pass transis-
tor allows the low, 82µA supply current to remain inde-
pendent of load, making these devices ideal for
battery-operated portable equipment such as cellular
phones and cordless phones.
The devices feature Dual Mode™ operation: their out-
put voltage is preset (at 3.15V for the T versions, 2.84V
for the S versions, or 2.80V for the R versions) or can be
adjusted with an external resistor divider. Total error on
the output is ±3.5%. Output voltages are set on the low
side of popular ranges so that power drain is minimized
for longer battery life. Other features include low-power
shutdown, short-circuit protection, thermal shutdown
protection, and reverse battery protection. The
MAX8874 also includes an auto-discharge function,
which actively discharges the output voltage to ground
when the device is placed in shutdown mode. Both
devices come in a miniature 5-pin SOT23 package.
For dual versions, refer to the MAX8865/MAX8866 data
sheet. For low-noise versions with 30µV_RMS output
noise, refer to the MAX8877/MAX8878.
________________________Applications
Cordless Telephones
Modems
PCS Telephones
Hand-Held Instruments
Cellular Telephones
Palmtop Computers
PCMCIA Cards
Electronic Planners
__________Typical Operating Circuit
____________________________Features
o LP2980 Pin-Compatible SOT23 Package
o Low, 55mV Dropout Voltage at 50mA I_OUT
(130mV at 120mA)
o Low, 73µA No-Load Supply Current
Low, 82µA Operating Supply Current (even in
dropout)
o Miniature External Components
o Thermal Overload Protection
o Output Current Limit
o Reverse Battery Protection
o Dual Mode Operation: Fixed or Adjustable
(1.25V to 6.5V) Output
o Low-Power Shutdown
______________Ordering Information
PART
TEMP. RANGE
PIN-
PACKAGE
SOT TOP
MARK
MAX8873TEUK-T -40°C to +85°C 5 SOT23-5 ABZH
MAX8873SEUK-T -40°C to +85°C 5 SOT23-5 ABZI
MAX8873REUK-T -40°C to +85°C 5 SOT23-5 ABZL
MAX8874TEUK-T -40°C to +85°C 5 SOT23-5 ABZJ
MAX8874SEUK-T -40°C to +85°C 5 SOT23-5 ABZK
MAX8874REUK-T -40°C to +85°C 5 SOT23-5 ABZM
__________________Pin Configuration
C_IN
1µF
BATTERY
IN
OUT
MAX8873
MAX8874
SHDN
GND
SET
OUTPUT
VOLTAGE
C_OUT
1µF
TOP VIEW
IN 1
5 OUT
MAX8873
GND 2 _MAX8874
SHDN 3
4 SET
SOT23-5
Dual Mode is a trademark of Maxim Integrated Products.
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