19-0990; Rev 0; 9/07
Low-Noise 500mA LDO Regulators
in a 2mm x 2mm TDFN Package
/MAX8902B
General Description
Features
The MAX8902A/MAX8902B low-noise linear regulators
deliver up to 500mA of output current with only
♦ 1.7V to 5.5V Input Voltage Range
♦ 0.6V to 5.3V Output Voltage Range
16µV
of output noise in a 100kHz bandwidth. These
RMS
♦ 16µV
Output Noise, 10Hz to 100kHz
RMS
regulators maintain their output voltage over a wide
input range, requiring only 100mV of input-to-output
headroom at full load.
♦ 80µA Operating Supply Current
♦ 92dB PSRR at 5kHz
These LDOs maintain a low 80µA typical supply cur-
rent, independent of the load current and dropout volt-
age. The regulator control circuitry includes a
programmable soft-start circuit and short circuit,
reverse current, and thermal overload protection. Other
features include a shutdown input and a power-OK out-
put (MAX8902B only).
♦ Guaranteed 500mA Output Current
♦
1.5ꢀ Output Aꢁꢁuraꢁy Oꢂer ꢃoad, ꢃine, and
Temperature
♦ 100mV (max) Dropout at 500mA ꢃoad
♦ < 1µA Shutdown Supply Current
♦ 700mA Short-Cirꢁuit Proteꢁtion
The MAX8902A output voltage can be set to 1.5V, 1.8V,
2.0V, 2.5V, 3.0V, 3.1V, 3.3V, 4.6V, or 4.7V using the
SELA and SELB inputs. The MAX8902B output voltage
can be set between 0.6V and 5.3V with an external
resistor voltage divider.
♦ Thermal-Oꢂerload Proteꢁtion
♦ Output-to-Input Reꢂerse Current Proteꢁtion
♦ 2mm x 2mm x 0.8mm TDFN Paꢁkage
Applications
Ordering Information
Notebook Computers
TOP
MARK
PKG
CODE
PART
FEATURES
MP3 and Portable Media Players
Wireless Headphones
Pin-selectable output
voltage
MAX8902AATA+
MAX8902BATA+
ABG
ABH
T822-1
T822-1
GPS Portable Navigation Devices
Smartphones
Adjustable output
voltage
+Denotes a lead-free, RoHS-compliant package.
Note: All devices are in an 8-pin, 2mm x 2mm TDFN package
with an exposed paddle and operate over the -40°C to +125°C
automotive temperature range.
Typical Operating Circuits
INPUT
INPUT
4.7V TO 5.5V
OUTPUT ADJUSTABLE
OUTPUT
4.6V
1.7V TO 5.5V
0.6V TO 5.3V
IN
OUT
IN
OUT
BYP
4.7μF
4.7μF
0.01μF
10μF
0.01μF
10μF
MAX8902B
MAX8902A
R1
R2
BYP
FB
ON
EN
EN
OFF
ON
LOGIC
SUPPLY
OFF
OUTS
R3
100kΩ
SELA
EP
GS
SELB
GND
POK
TO μC
GND
EP
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Produꢁts
1
For priꢁing, deliꢂery, and ordering information, please ꢁontaꢁt Maxim Direꢁt at 1-888-629-4642,
or ꢂisit Maxim's website at www.maxim-iꢁ.ꢁom.