MAX8530_05 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Dual Low-Dropout Linear Regulators with RESET or Low-Noise Output in UCSP or QFN

19-2711; Rev 1; 8/05
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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
INPUT
2.5V TO 6.5V
CIN
2.2μF
IN
OUT1
MAX8530
RESET
Features
♦ 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_RMS Output Noise (MAX8531)
♦ Low 130µA Operating Supply Current
♦ <1µA Shutdown Current
♦ Thermal-Overload and Short-Circuit Protection
♦ Output Current Limit
♦ 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 OUT_
PIN-
RANGE 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
*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
1.5V TO 3.3V
AT 200mA
2.2μF
VI/O
BASEBAND
μP
RESET
ON
OFF
SHDN
GND
OUT2
1μF ^{1.5V TO 3.3V}
AT 150mA
VCORE
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.