The MAX1806 low-dropout linear regulator operates from a +2.25V to +5.5V supply and delivers a guaranteed 500mA load current with low 175mV dropout. The high-accuracy (±1%) output voltage is preset at an internally trimmed voltage (see Selector Guide) or can be adjusted from +0.8V to +4.5V with an external resistive-divider.

An internal PMOS pass transistor allows low 210µA supply current, making this device ideal for portable equipment such as personal digital assistants (PDAs), cellular phones, cordless phones, and other equipment, including base stations and docking stations.

Other features include an active-low, power-OK output that indicates when the output is out of regulation, a 0.02µA shutdown mode, short-circuit protection, and thermal shutdown protection. The MAX1806 comes in a miniature 1.3W, 8-pin power-µMAX® package with a metal pad on the underside of the package.

MAX1806: Typical Operating Circuit

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Key Features

Guaranteed 500mA Output Current
Output Down to 0.8V
Low 175mV Dropout at 500mA
±1% Output Voltage Accuracy
- Preset at 0.8V, 1.5V, 1.8V, 2.5V, or 3.3V
- Adjustable from 0.8V to 4.5V
Power-OK Output
Low 210µA Ground Current
0.02µA Shutdown Current
Thermal Overload Protection
Output Current Limit
Tiny 1.3W, 8-Pin Power-µMAX Package

Applications/Uses

Cell Phones/Cordless Phones
Docking Stations
Notebook Computers
Palmtop Computers
PDAs
USB Hubs
Wireless Base Stations

Key Specs

Part Number

Regulators

V_IN
(V)

Preset V_OUT
(V)

Adj. V_OUT
(V)

V_DROPOUT @Rated I_LOAD
(V)

Rated I_LOAD
(mA)

I_CC
(µA)

Output Voltage Noise
(µV RMS)

Ref. Bypass

Low Batt./ Pwr. Fail Out

POK/Reset Thresh.
(V)

Watchdog

Reverse Batt. Protect.

Oper. Temp.
(°C)

Package/Pins

Budgetary
Price

min

max

min

max

typ

max

typ

nom

See Notes

MAX1806

2.25

5.5

0.8

1.5

1.8

2.5

3.3

0.8

4.5

0.17

500

400

300

Vout-7%

-40 to +85

µMAX-EP/8

$1.50 @1k

See All Linear Regulators (140)

Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Technical Documents

App Note 1845 Choosing the Right DC-DC Converter for Automotive Applications
Tutorial 660 Regulator Topologies for Battery-Powered Systems

Quality and Environmental Data

Product Reliability Reports: MAX1806.pdf
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX1806

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >