MAX8877 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Low-Noise, Low-Dropout, 150mA Linear Regulators with ‘2982 Pinout

19-1301; Rev 1; 3/98
Low-Noise, Low-Dropout, 150mA Linear
Regulators with ‘2982 Pinout
__________________General Description
The MAX8877/MAX8878 low-noise, low-dropout linear
regulators operate from a 2.5V to 6.5V input and deliver
up to 150mA. These devices are pin-compatible with
the industry-standard ‘2982 and offer an improved
dropout voltage. Typical output noise is 30µV_RMS, and
typical dropout is only 165mV at 150mA. The output
voltage is preset to voltages in the range of 2.5V to
5.0V, in 100mV increments.
Designed with an internal P-channel MOSFET pass
transistor, the MAX8877/MAX8878 maintain a low
100µA supply current, independent of the load current
and dropout voltage. Other features include a 10nA
logic-controlled shutdown mode, short-circuit and ther-
mal-shutdown protection, and reverse battery protec-
tion. The MAX8878 also includes an auto-discharge
function, which actively discharges the output voltage
to ground when the device is placed in shutdown. Both
devices come in a miniature 5-pin SOT23 package.
____________________________Features
o Pin-Compatible with the Industry-Standard ‘2982
o Low Output Noise: 30µV_RMS
o Low 55mV Dropout at 50mA Output
(165mV at 150mA output)
o Low 85µA No-Load Supply Current
o Low 100µA Operating Supply Current
(even in dropout)
o Thermal-Overload and Short-Circuit Protection
o Reverse Battery Protection
o Output Current Limit
o Preset Output Voltages (±1.4% Accuracy)
o 10nA Logic-Controlled Shutdown
________________________Applications
Cellular Telephones
Cordless Telephones
PCS Telephones
PCMCIA Cards
Modems
Hand-Held Instruments
Palmtop Computers
Electronic Planners
_________________Ordering Information
PART**
MAX8877C/Dxy
MAX8877EUKxy-T
MAX8878C/Dxy
MAX8878EUKxy-T
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
5 SOT23-5
Dice*
5 SOT23-5
*Dice are tested at T_A = +25°C only.
**xy is the output voltage code (see Expanded Ordering
Information table at end of data sheet).
____________Typical Operating Circuit _____________________Pin Configuration
INPUT
2.5V TO 6.5V
IN
OUT
C_IN
1µF
ON
OFF
C_OUT
MAX8877
1µF
MAX8878
SHDN
BP
C_BP
GND
0.01µF
OUTPUT
PRESET
2.5V TO 5.0V
150mA
TOP VIEW
IN 1
5 OUT
MAX8877
GND 2 _MAX8878
SHDN 3
4 BP
SOT23-5
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