19-0629; Rev 1; 1/07
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
General Description
Features
♦ Space-Saving 1.0mm x 1.5mm x 0.8mm µDFN
The MAX8840/MAX8841/MAX8842 ultra-low-noise, low-
dropout (LDO) linear regulators are designed to deliver
up to 150mA continuous output current. These regula-
tors achieve a low 120mV dropout for 120mA load cur-
rent. The MAX8840 uses an advanced architecture to
♦ 11µV
Output Noise at 100Hz to 100kHz
RMS
Bandwidth (MAX8840)
♦ 78dB PSRR at 1kHz (MAX8840)
♦ 120mV Dropout at 120mA Load
achieve ultra-low output voltage noise of 11µV
PSRR of 54dB at 100kHz.
and
RMS
♦ Stable with 1µF Ceramic Capacitor for Any Load
♦ Guaranteed 150mA Output
♦ Only Need Input and Output Capacitors (MAX8841)
♦ Output Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V,
2.85V, 3V, 3.3V, 4.5V (MAX8840/MAX8841) and
Adjustable (MAX8842)
The MAX8841 does not require a bypass capacitor,
hence achieving the smallest PC board area. The
MAX8842 output voltage can be adjusted with an exter-
nal divider.
The MAX8840/MAX8841 are preset to a variety of volt-
ages in the 1.5V to 4.5V range. Designed with a p-channel
MOSFET series pass transistor, the MAX8840/MAX8841/
MAX8842 maintain very low ground current (40µA).
♦ Low 40µA Ground Current
♦ Excellent Load/Line Transient
♦ Overcurrent and Thermal Protection
The regulators are designed and optimized to work with
low-value, low-cost ceramic capacitors. The MAX8840
requires only 1µF (typ) of output capacitance for stability
with any load. When disabled, current consumption drops
to below 1µA.
Ordering Information
PART*
TEMP RANGE
PIN-PACKAGE
The MAX8840/MAX8841/MAX8842 are available in a tiny
1.0mm x 1.5mm x 0.8mm µDFN.
6 µDFN-6
1.5mm x 1.0mm
MAX8840ELTxy+T
-40°C to +85°C
6 µDFN-6
1.5mm x 1.0mm
Applications
Cellular and Cordless Phones
PDA and Palmtop Computers
Base Stations
MAX8841ELTxy+T
MAX8842ELT+T
-40°C to +85°C
-40°C to +85°C
6 µDFN-6
1.5mm x 1.0mm
*xy is the output voltage code (see the Output Voltage Selector
Guide). Other versions between 1.5V and 4.5V are available in
100mV increments. Contact factory for other versions.
Bluetooth Portable Radios and Accessories
Wireless LANs
Digital Cameras
+Denotes lead-free package.
Personal Stereos
Portable and Battery-Powered Equipment
Output Voltage Selector Guide appears at end of data sheet.
Typical Operating Circuits
Pin Configuration
TOP VIEW
INPUT
2V TO 6V
OUTPUT PRESET
1.5V TO 4.5V
IN
OUT
BP
OUT
N.C.
1
2
3
6
5
4
IN
GND
C
BP
10nF
C
IN
MAX8840
1µF
MAX8840
MAX8841
MAX8842
ON
SHDN
C
1µF
OUT
OFF
GND
BP (MAX8840)
N.C. (MAX8841)
FB (MAX8842)
SHDN
µDFN
(1.5mm x 1.0mm)
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.