19-2711; Rev 1; 8/05
Dual Low-Dropout Linear Regulators
with RESET or Low-Noise Output in UCSP or QFN
General Description
Features
The MAX8530/MAX8531 offer the benefits of low-
dropout voltage and ultra-low power regulation in
subminiaturized UCSP and QFN packages with an inte-
grated microprocessor reset circuit (MAX8530 only).
The devices operate from a 2.5V to 6.5V input and
deliver up to 200mA and 150mA outputs with low
dropout of 100mV (typ) at 100mA. Designed with an
internal P-channel MOSFET pass transistor, the supply
current is kept at a low 130µA (with both LDOs on),
independent of the load current and dropout voltage.
Other features include short-circuit protection and
thermal-shutdown protection.
♦ Guaranteed 200mA Output Current for OUT1
♦ Guaranteed 150mA Output Current for OUT2
♦ Low 100mV (typ) Dropout at 100mA Load for
both LDOs
♦ Open-Drain, Active-Low 100ms (min) Reset Timer
(MAX8530)
♦ Low 40µV
Output Noise (MAX8531)
RMS
♦ Low 130µA Operating Supply Current
♦ <1µA Shutdown Current
♦ Thermal-Overload and Short-Circuit Protection
♦ Output Current Limit
The MAX8530 provides microprocessor open-drain,
active-low reset output to monitor OUT1, eliminating
external components and adjustments. The MAX8530
asserts a 100ms (min) RESET signal when OUT1 drops
below 87% of the nominal output voltage. The MAX8531
includes a reference bypass pin for low output noise
♦ Tiny Packages Available
1.16 x 1.57 x 0.6mm UCSP (3 x 2 Grid)
3mm x 3mm Thin QFN
Ordering Information
(40µV
).
RMS
TEMP
RANGE
OUT_
PIN-
Both devices include a logic-controlled shutdown input
and are available in 6-bump UCSP and 6-pin thin QFN
exposed pad packages.
PART
VOLTAGE PACKAGE
MAX8530EBTxy*-T -40°C to +85°C 1.5V to 3.3V 6 UCSP
MAX8530EBTxy*+T -40°C to +85°C 1.5V to 3.3V 6 UCSP
MAX8530ETTxy*-T -40°C to +85°C 1.5V to 3.3V 6 Thin QFN-EP**
MAX8530ETTxy*+T -40°C to +85°C 1.5V to 3.3V 6 Thin QFN-EP**
MAX8531EBTxy*-T -40°C to +85°C 1.5V to 3.3V 6 UCSP
MAX8531EBTxy*+T -40°C to +85°C 1.5V to 3.3V 6 UCSP
MAX8531ETTxy*-T -40°C to +85°C 1.5V to 3.3V 6 Thin QFN-EP
MAX8531ETTxy*+T -40°C to +85°C 1.5V to 3.3V 6 Thin QFN-EP
Applications
Cellular and Cordless Phones
PDAs and Palmtop Computers
Notebook Computers
Digital Cameras
PCMCIA Cards
Wireless LAN Cards
Hand-Held Instruments
*xy = Output voltage code (see the Output Voltage Selector
Guide).
**EP = Exposed pad.
+Denotes lead-free package.
Pin Configurations appear at end of data sheet.
Output Voltage Selector Guide appears at end of data sheet.
Typical Operating Circuit
INPUT
2.5V TO 6.5V
1.5V TO 3.3V
AT 200mA
V
IN
OUT1
I/O
C
2.2μF
IN
2.2μF
BASEBAND
μP
MAX8530
RESET
RESET
OUT2
ON
V
SHDN
CORE
OFF
1.5V TO 3.3V
AT 150mA
1μF
GND
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.