MAX8940 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulator

19-4662; Rev 0; 6/09
Low-Noise, High PSRR,
Low-Dropout, 120mA Linear Regulator
General Description
The MAX8940 low-noise, low-dropout (LDO) linear reg-
ulator is designed to deliver up to 120mA continuous
output current. This regulator achieves a low 120mV
dropout for 120mA load current. The MAX8940 uses an
advanced architecture to achieve low output voltage
noise of 25µV_RMS and PSRR of 45dB at 100kHz.
The MAX8940 is preset to either 2.8V or 3.0V. Designed
with a p-channel MOSFET series pass transistor, the
MAX8940 maintain very low ground current (40µA).
The regulator is designed and optimized to work with low-
value, low-cost ceramic capacitors. The MAX8940
requires only 1µF (typ) of output capacitance for stability
with any load. When disabled, current consumption drops
to below 1µA.
Package is a 5-pin SC70.
Applications
Cellular and Cordless Phones
PDA and Palmtop Computers
Base Stations
Bluetooth Portable Radios and Accessories
Wireless LANs
Digital Cameras
Personal Stereos
Portable and Battery-Powered Equipment
Features
♦ Space-Saving SC70
♦ 25µV_RMS Output Noise at 100Hz to 100kHz
Bandwidth
♦ 65dB PSRR at 10kHz
♦ 120mV Dropout at 120mA Load
♦ Stable with 1µF Ceramic Capacitor for Any Load
♦ Guaranteed 120mA Output
♦ Output Voltages: 2.8V or 3V
♦ Low 40µA Ground Current
♦ Excellent Load/Line Transient
♦ Overcurrent and Thermal Protection
Ordering Information
PART*
TEMP RANGE PIN-PACKAGE
MAX8940EXKxy-T
-40°C to +85°C 5 SC70
MAX8940EXKxy+T
-40°C to +85°C 5 SC70
*xy is the output voltage code (see Output Voltage Selector
Guide).
+Denotes a lead(Pb)-free/RoHS-compliant package.
Output Voltage Selector Guide
PART
MAX8940EXK28-T
MAX8940EXK30-T
V_OUT (V)
2.8
3
TOP MARK
AUE
AUD
Pin Configuration
TOP VIEW
IN ¹
5 OUT
GND 2 MAX8940
SHDN 3
4 BP
SC70
Typical Operating Circuit
INPUT
2V TO 6V
C_IN = 1µF
ON
OFF
PRESET OUTPUT
2.8V OR 3.0V
IN
OUT
MAX8940
SHDN
GND
BP ^{CBP = 10nF}
C_OUT = 1µF
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.