the following example is for you reference.
(NEW and ORIGINAL)
(5V/3.3V or Adjustable, Low-Dropout, Low-IQ, 500mA Linear
- 500mA Output Current, with Foldback Current Limiting
- High-Power (1.8W) 8-Pin SO Package
- Dual Mode™ Operation: Fixed or Adjustable Output from 1.25V to 11V
- Large Input Range (2.7V to 11.5V)
- Internal 500mA P-Channel Pass Transistor
- 15µA Typical Quiescent Current
- 2µA (Max) Shutdown Mode
- Thermal Overload Protection
- Reverse-Current Protection
|lead package||High-Power (1.8W) 8-Pin SO Package|
|Fixed or Adjustable Output||from 1.25V to 11V|
|Large Input Range||2.7V to 11.5V|
|lTypical Quiescent Current||15µA|
|Shutdown Mode||2µA (Max)|
|P-Channel Pass Transistor||Internal 500mA|
The MAX603/MAX604 low-dropout, low quiescent current, linear
regulators supply 5V, 3.3V, or an adjustable output for currents up
to 500mA. They are available in a 1.8W SO package. Typical dropouts
are 320mV at 5V and 500mA, or 240mV at 3.3V and 200mA. Quiescent
currents are 15µA typ and 35µA max. Shutdown turns off all
circuitry and puts the regulator in a 2µA off mode. A unique
protection scheme limits reverse currents when the input voltage
falls below the output. Other features include foldback current
limiting and thermal overload protection.
The output is preset at 3.3V for the MAX604 and 5V for the MAX603.
In addition, both devices employ Dual Mode™ operation, allowing
user-adjustable outputs from 1.25V to 11V using external resistors.
The input voltage supply range is 2.7V to 11.5V.
The MAX603/MAX604 feature a 500mA P-channel MOSFET pass transistor.
This transistor allows the devices to draw less than 35µA over
temperature, independent of the output current. The supply current
remains low because the P-channel MOSFET pass transistor draws no
base currents (unlike the PNP transistors of conventional bipolar
linear regulators). Also, when the input-to-output voltage
differential becomes small, the internal P-channel MOSFET does not
suffer from excessive base current losses that occur with saturated
- 1.25V to 11V Adjustable Regulators
- 5V and 3.3V Regulators
- Automotive Electronics
- Pagers and Cell Phones
- Portable Instrumentation
- Solar-Powered Instruments
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