MAX8530, MAX8531 Dual Low-Dropout Linear Regulator with Reset or Low-Noise Output in UCSP or QFN

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The MAX8530/MAX8531 offer the benefits of low-dropout voltage and ultra-low power regulation in subminiaturized UCSP and QFN packages with an integrated 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-bar 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.

Key Features

Applications/Uses

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

	Cell Phones/Cordless Phones
	Digital Cameras
	Handheld Instruments (PDAs, Palmtops)
	Notebook Computers
	PCMCIA Cards
	PDAs and Palmtop Computers
	Wireless Local Area Networks (WLANs)

Key Specifications: Linear Regulators

Part Number

Regulators per Pkg.

Min. V_IN (V)

Max. V_IN (V)

Preset V_OUT (V)

Typ. V_DROPOUT@ Rated I_LOAD (V)

Rated I_LOAD (mA)

Max. I_CC (µA)

Low Battery/ Power Fail Output

POK/ Reset Output

POK/ Reset Output Type

Nominal POK/Reset Threshold (V)

Min. Reset Pulse Width (ms)

Watchdog

Reverse Battery Protection

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX8530

2.5

6.5

1.5 to 3.3

0.22

200

220

Reset

Open Drain Active Low

Vout-13%

100

THIN QFN (Dual)/6
UCSP/6

-40 to +85

$0.75 @ 1k

MAX8531

$0.75 @ 1k

See All Linear Regulators (138)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.