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, 82碌A(chǔ) 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鈩?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 鹵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 30碌V
RMS
output
noise, refer to the MAX8877/MAX8878.
____________________________Features
o
LP2980 Pin-Compatible SOT23 Package
o
Low, 55mV Dropout Voltage at 50mA I
OUT
(130mV at 120mA)
o
Low, 73碌A(chǔ) No-Load Supply Current
Low, 82碌A(chǔ) 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
MAX8873T/S/R, MAX8874T/S/R
______________Ordering Information
PART
TEMP. RANGE
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
SOT TOP
MARK
ABZH
ABZI
ABZL
ABZJ
ABZK
ABZM
________________________Applications
Cordless Telephones
PCS Telephones
Cellular Telephones
PCMCIA Cards
Modems
Hand-Held Instruments
Palmtop Computers
Electronic Planners
MAX8873TEUK-T
-40擄C to +85擄C
MAX8873SEUK-T
-40擄C to +85擄C
MAX8873REUK-T -40擄C to +85擄C
MAX8874TEUK-T
-40擄C to +85擄C
MAX8874SEUK-T
-40擄C to +85擄C
MAX8874REUK-T -40擄C to +85擄C
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
IN
1
5
OUT
IN
OUT
OUTPUT
VOLTAGE
C
OUT
1碌F
GND
2
BATTERY
C
IN
1碌F
MAX8873
MAX8874
SHDN
GND
SET
MAX8873
MAX8874
SHDN
3
4
SET
SOT23-5
Dual Mode is a trademark of Maxim Integrated Products.
________________________________________________________________
Maxim Integrated Products
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For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
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