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300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit

Product Details

The MAX6469–MAX6484 are low-dropout linear regulators with a fully integrated microprocessor reset circuit. Each is available with preset output voltages from +1.5V to +3.3V in 100mV increments and delivers up to 300mA of load current. These devices consume only 82µA of supply current. The low supply current, low dropout voltage, and integrated reset functionality make these devices ideal for battery-powered portable equipment.

The MAX6469–MAX6484 include a reset output that indicates when the regulator output drops below standard microprocessor supply tolerances (-7.5% or -12.5% of nominal output voltage). This eliminates the need for an external microprocessor supervisor, while ensuring that supply voltages and clock oscillators have stabilized before processor activity is enabled. Push-pull and open-drain active-low reset outputs are available, with reset timeout periods of 2.5ms, 20ms, 150ms, or 1200ms (min).

The MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–MAX6484 also have a shutdown feature that reduces the supply current to 0.1µA (typ). The MAX6471-MAX6474/MAX6479–MAX6482 offer a manual reset input to assert a microprocessor reset while the regulator output is within specification. The MAX6475/MAX6476/MAX6483/MAX6484 feature a remote feedback sense pin for use with an external NPN transistor for higher-current applications. The MAX6469–MAX6476 are available in 6-pin SOT23 and 8-pin TDFN packages. The MAX6477–MAX6484 are available in a 3 × 3 chip-scale package (UCSP™). All devices are specified for operation from -40°C to +85°C.

Key Features

  • 3 x 3 UCSP, 6-Pin SOT23, and 8-Pin TDFN Packages
  • Preset +1.5V to +3.3V Output (100mV Increments)
  • SET Pin for Adjustable Output Voltage
  • 75µVRMS LDO Output Voltage Noise (MAX6477–MAX6484)
  • ±2.0% Accuracy Over Temperature
  • Guaranteed 300mA Output Current
  • Low Dropout Voltage
    • 55mV at 150mA
    • 114mV at 300mA
  • 82µA Supply Current, 0.1µA Shutdown Current
  • Input Reverse Current, Thermal and Short-Circuit Protection
  • Microprocessor Reset with Four Timeout Options
  • Push-Pull or Open-Drain Active-Low RESET
  • Manual Reset Input
  • Remote Feedback Sense

Applications/Uses

  • Bluetooth® Modules/Wireless LAN
  • CD/DVD Drives
  • Cell Phones/Cordless Phones
  • Digital Cameras
  • Handheld Instruments (PDAs, Palmtops)
  • Notebook Computers
  • PCMCIA Cards/USB Devices
Parametric specs for Linear Regulators
VIN (V) (min) 2.5
VIN (V) (max) 5.5
Rated ILOAD (mA) 300
Preset VOUT (V) 2
3
# Regulators 1
VDROPOUT @Rated ILOAD (V) (typ) 0.11
ICC (µA) (max) 136
Output Voltage Noise (µV RMS) (typ) 150
Ref. Bypass No
Low Batt./ Pwr. Fail Out No
POK/Reset Thresh. (V) (nom) Vout-12.5%
Vout-7.5%
Watchdog No
Reverse Batt. Protect. No
Oper. Temp. (°C) -40 to +85
Package/Pins TDFN/8
Budgetary
Price (See Notes)
$1.86 @1k
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Simplified Block Diagram

MAX6469, MAX6470, MAX6471, MAX6472, MAX6473, MAX6474, MAX6475, MAX6476, MAX6477, MAX6478, MAX6479, MAX6480, MAX6481, MAX6482, MAX6483, MAX6484: Typical Application Circuit MAX6469, MAX6470, MAX6471, MAX6472, MAX6473, MAX6474, MAX6475, MAX6476, MAX6477, MAX6478, MAX6479, MAX6480, MAX6481, MAX6482, MAX6483, MAX6484: Typical Application Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX6470 evaluation kit (EV kit) circuit features the MAX6470 low-dropout linear regulator with an integrated microprocessor reset output signal. The circuit provides a preset 3.3V output from a 3.6V to 5.5V input range and delivers 300mA of load current. The MAX6470 EV kit is a fully assembled and tested surface-mount circuit board that accommodates the MAX6470 IC in both the 6-pin SOT23 and 8-pin QFN packages. The EV kit board can also be used to evaluate the MAX6469-MAX6476 linear regulators. For output voltages less than 3.3V, the input voltage range can go down to 2.5V.

View Details

Features

  • Preset 3.3V Output
  • Adjustable Output Voltage (1.2V to 5V)
  • 300mA Output Current
  • 57mV (typ) Dropout Voltage at 150mA Output Current
  • Microprocessor active-low RESET Output Signal with Timeout Period
  • Supports 6-Pin SOT23 and 8-Pin QFN Packages
  • Fully Assembled and Tested

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Parameters

Parametric specs for Linear Regulators
VIN (V) (min) 2.5
VIN (V) (max) 5.5
Rated ILOAD (mA) 300
Preset VOUT (V) 2
3
# Regulators 1
VDROPOUT @Rated ILOAD (V) (typ) 0.11
ICC (µA) (max) 136
Output Voltage Noise (µV RMS) (typ) 150
Ref. Bypass No
Low Batt./ Pwr. Fail Out No
POK/Reset Thresh. (V) (nom) Vout-12.5%
Vout-7.5%
Watchdog No
Reverse Batt. Protect. No
Oper. Temp. (°C) -40 to +85
Package/Pins TDFN/8
Budgetary
Price (See Notes)
$1.86 @1k

Key Features

  • 3 x 3 UCSP, 6-Pin SOT23, and 8-Pin TDFN Packages
  • Preset +1.5V to +3.3V Output (100mV Increments)
  • SET Pin for Adjustable Output Voltage
  • 75µVRMS LDO Output Voltage Noise (MAX6477–MAX6484)
  • ±2.0% Accuracy Over Temperature
  • Guaranteed 300mA Output Current
  • Low Dropout Voltage
    • 55mV at 150mA
    • 114mV at 300mA
  • 82µA Supply Current, 0.1µA Shutdown Current
  • Input Reverse Current, Thermal and Short-Circuit Protection
  • Microprocessor Reset with Four Timeout Options
  • Push-Pull or Open-Drain Active-Low RESET
  • Manual Reset Input
  • Remote Feedback Sense

Applications/Uses

  • Bluetooth® Modules/Wireless LAN
  • CD/DVD Drives
  • Cell Phones/Cordless Phones
  • Digital Cameras
  • Handheld Instruments (PDAs, Palmtops)
  • Notebook Computers
  • PCMCIA Cards/USB Devices

Description

The MAX6469–MAX6484 are low-dropout linear regulators with a fully integrated microprocessor reset circuit. Each is available with preset output voltages from +1.5V to +3.3V in 100mV increments and delivers up to 300mA of load current. These devices consume only 82µA of supply current. The low supply current, low dropout voltage, and integrated reset functionality make these devices ideal for battery-powered portable equipment.

The MAX6469–MAX6484 include a reset output that indicates when the regulator output drops below standard microprocessor supply tolerances (-7.5% or -12.5% of nominal output voltage). This eliminates the need for an external microprocessor supervisor, while ensuring that supply voltages and clock oscillators have stabilized before processor activity is enabled. Push-pull and open-drain active-low reset outputs are available, with reset timeout periods of 2.5ms, 20ms, 150ms, or 1200ms (min).

The MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–MAX6484 also have a shutdown feature that reduces the supply current to 0.1µA (typ). The MAX6471-MAX6474/MAX6479–MAX6482 offer a manual reset input to assert a microprocessor reset while the regulator output is within specification. The MAX6475/MAX6476/MAX6483/MAX6484 feature a remote feedback sense pin for use with an external NPN transistor for higher-current applications. The MAX6469–MAX6476 are available in 6-pin SOT23 and 8-pin TDFN packages. The MAX6477–MAX6484 are available in a 3 × 3 chip-scale package (UCSP™). All devices are specified for operation from -40°C to +85°C.

Simplified Block Diagram

MAX6469, MAX6470, MAX6471, MAX6472, MAX6473, MAX6474, MAX6475, MAX6476, MAX6477, MAX6478, MAX6479, MAX6480, MAX6481, MAX6482, MAX6483, MAX6484: Typical Application Circuit MAX6469, MAX6470, MAX6471, MAX6472, MAX6473, MAX6474, MAX6475, MAX6476, MAX6477, MAX6478, MAX6479, MAX6480, MAX6481, MAX6482, MAX6483, MAX6484: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal