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Low-Voltage, Low-Dropout Linear Regulators with External Bias Supply

Product Details

Key Features

Parametric specs for Linear Regulators
VIN (V) (min) 1.25
VIN (V) (max) 5.5
Adj. VOUT (V) (min) 0.8
Adj. VOUT (V) (max) 2
Rated ILOAD (mA) 300
# Regulators 1
VDROPOUT @Rated ILOAD (V) (typ) 0.35
ICC (µA) (max) 250
Output Voltage Noise (µV RMS) (typ) 65
Ref. Bypass No
Low Batt./ Pwr. Fail Out No
Watchdog No
Reverse Batt. Protect. No
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/6
Budgetary
Price (See Notes)
1.1
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Simplified Block Diagram

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Parameters

Parametric specs for Linear Regulators
VIN (V) (min) 1.25
VIN (V) (max) 5.5
Adj. VOUT (V) (min) 0.8
Adj. VOUT (V) (max) 2
Rated ILOAD (mA) 300
# Regulators 1
VDROPOUT @Rated ILOAD (V) (typ) 0.35
ICC (µA) (max) 250
Output Voltage Noise (µV RMS) (typ) 65
Ref. Bypass No
Low Batt./ Pwr. Fail Out No
Watchdog No
Reverse Batt. Protect. No
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/6
Budgetary
Price (See Notes)
1.1

Key Features

  • Low-Cost 1.2V, 300mA VID Supply
  • ±3% Output Voltage Accuracy
  • No Minimum Load Current Required
  • 1.25V to 5.5V Input Supply Voltage
  • 5V Input Bias Supply Voltage
  • Power-Good (PGOOD) Open-Drain Output with 1ms Rising Edge Propagation Delay (MAX1982)
  • Adjustable Output Voltage (MAX1983)
  • Low Supply Current (IBIAS + IIN = 165µA typ)
  • 5µA (max) Shutdown Supply Current
  • Tiny 6-Pin SOT23 Package

Applications/Uses

  • Cell Phones
  • Low-Dropout Regulators with External Bias Supply
  • Notebook Computers
  • PDAs
  • VID Power Supplies

Description

The MAX1982/MAX1983 are low-voltage, low-dropout linear regulators with an external bias supply input. The 5V bias supply drives the gate of the internal N-channel pass transistor, making these devices ideal for applications that require low-voltage outputs from low-voltage inputs. The MAX1982 delivers 1.2V (±3%) at 300mA from an input voltage of 1.25V to 5.5V. The MAX1983 delivers an adjustable output voltage from 0.8V to 2V.

The MAX1982/MAX1983 include a current-limit and thermal shutdown that protects the regulator in the event of a fault condition. Both devices are offered in a 6-pin SOT23 package and are specified over the extended (-40°C to +85°C) temperature range.

Simplified Block Diagram

MAX1982, MAX1983: Typical Operating Circuit MAX1982, MAX1983: Typical Operating 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 .