Rainbow Electronics MAX8842 - Manual

General Description
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
achieve ultra-low output voltage noise of 11µV
RMS
and
PSRR of 54dB at 100kHz.
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).
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.
The MAX8840/MAX8841/MAX8842 are available in a tiny
1mm x 1.5mm x 0.8mm µDFN.
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 1.0mm x 1.5mm x 0.8mm µDFN
♦ 11µV
RMS Output Noise at 100Hz to 100kHz
Bandwidth (MAX8840)
♦ 78dB PSRR at 1kHz (MAX8840)
♦ 120mV Dropout at 120mA Load
♦ 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)
♦ Low 40µA Ground Current
♦ Excellent Load/Line Transient
♦ Overcurrent and Thermal Protection
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
________________________________________________________________ Maxim Integrated Products 1
μDFN
(1.5mm x 1.0mm)
TOP VIEW
GND
BP (MAX8840)
N.C. (MAX8841)
FB (MAX8842)
SHDN
1
2
3
6
4
OUT
5 N.C.
IN
MAX8840
MAX8841
MAX8842
Pin Configuration
Ordering Information
MAX8840
OUTPUT PRESET
1.5V TO 4.5V
IN
INPUT
2V TO 6V
OFF
SHDN
C BP
10nF
C OUT
1 μF
C IN
1 μF
OUT
ON
BP
GND
Typical Operating Circuits
19-0629; Rev 1; 1/07
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.
*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.
+Denotes lead-free package.
PART* TEMP RANGE PIN-PACKAGE
MAX8840ELTxy+T -40°C to +85°C
6 µDFN-6
1.5mm x 1.0mm
MAX8841ELTxy+T -40°C to +85°C
6 µDFN-6
1.5mm x 1.0mm
MAX8842ELT+T -40°C to +85°C
6 µDFN-6
1.5mm x 1.0mm
Typical Operating Circuits continued at end of data sheet.
Output Voltage Selector Guide appears at end of data sheet.