MAX8530 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Dual Low-Dropout Linear Regulators with RESETor Low-Noise Output in UCSP or QFN

19-2711; Rev 0; 1/03
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Dual Low-Dropout Linear Regulators
with RESET or Low-Noise Output in UCSP or QFN
General Description
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.
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
(40µV_RMS).
Both devices include a logic-controlled shutdown input
and are available in 6-bump UCSP and 6-pin thin QFN
exposed pad packages.
Applications
Cellular and Cordless Phones
PDAs and Palmtop Computers
Notebook Computers
Digital Cameras
PCMCIA Cards
Wireless LAN Cards
Hand-Held Instruments
Features
o Guaranteed 200mA Output Current for OUT1
o Guaranteed 150mA Output Current for OUT2
o Low 100mV (typ) Dropout at 100mA Load for
both LDOs
o Open-Drain, Active-Low 100ms (min) Reset Timer
(MAX8530)
o Low 40µV_RMS Output Noise (MAX8531)
o Low 130µA Operating Supply Current
o <1µA Shutdown Current
o Thermal-Overload and Short-Circuit Protection
o Output Current Limit
o Tiny Packages Available
1.16 x 1.57 x 0.6mm UCSP (3 x 2 Grid)
3mm x 3mm Thin QFN
Ordering Information
PART
TEMP RANGE
OUT_
VOLTAGE
PIN-
PACKAGE
MAX8530EBTxy* -40°C to +85°C 1.5V to 3.3V 6 UCSP
MAX8530ETTxy* -40°C to +85°C 1.5V to 3.3V 6 Thin QFN-EP**
MAX8531EBTxy* -40°C to +85°C 1.5V to 3.3V 6 UCSP
MAX8531ETTxy* -40°C to +85°C 1.5V to 3.3V 6 Thin QFN-EP
*xy = Output voltage code (see the Output Voltage Selector
Guide).
**EP = Exposed pad.
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
C_IN
2.2µF
IN
OUT1
MAX8530
RESET
1.5V TO 3.3V
AT 200mA
2.2µF
V_I/O
BASEBAND
µP
RESET
ON
OFF
SHDN
GND
OUT2
1µF ^{1.5V TO 3.3V}
AT 150mA
V_CORE
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.