MAX1935

500mA, Low-Voltage Linear Regulator in Tiny QFN


Description

The MAX1935 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 (±1.5%) output voltage is preset at an internally trimmed voltage 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 MAX1935 comes in a tiny 1.9W, 8-pin 3mm x 3mm thin QFN package.
MAX1935: Typical Operating Circuit MAX1935: Typical Operating Circuit Enlarge+

Key Features

  • Guaranteed 500mA Output Current
  • Output Down to 0.8V
  • Low 175mV Dropout at 500mA
  • ±1.5% Output Voltage Accuracy
    • Preset at 1.5V
    • 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 1.9W, 8-Pin 3mm x 3mm Thin QFN Package

Applications/Uses

  • Cell Phones/Cordless Phones
  • Docking Stations
  • Notebook Computers
  • Palmtop Computers
  • PDAs
  • USB Hubs
  • Wireless Base Stations
Part Number Regulators VIN
(V)
VIN
(V)
Preset VOUT
(V)
Special Order Preset Adj. VOUT
(V)
Adj. VOUT
(V)
VDROPOUT @Rated ILOAD
(V)
Rated ILOAD
(mA)
Rated ILOAD
(mA)
ICC
(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
MAX1935  1 2.25 5.5 1.5 1.5 to 4.5 by 0.1 0.8 4.5 0.175 500 500 600 300 No No Vout-7% No No -40 to +85
TDFN-EP/8
$1.00 @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.

Technical Documents

Tutorial 660 Regulator Topologies for Battery-Powered Systems

Quality and Environmental Data

Product Reliability Reports: MAX1935.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX1935

Related Resources