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

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.

Applications

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

* 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