On-chip thermal limiting provides protection against any combination of overload and ambient temperatures that would create excessive junction temperatures. Unlike PNP type regulators where up to 10% of the output current is wasted as quiescent current, the quiescent current of the IMP1117A flows into the load, increasing efficiency.

The IMP1117A series regulators are available in the industry-standard SOT-223, TO-220, and TO-252 (DPAK) power packages.

• Low Dropout Voltage
  
  - Load regulation: 0.05% typical
  - Optimized for Low Voltage
  - On-chip thermal limiting
  - Standard SOT-223, TO-220, and TO-252 packages
  - Three-terminal adjustable or fixed low dropout 1.8V, 2.5V, 2.85V, 3.3V, 5V. Regulators

• Active SCSI terminators
• High efficiency linear regulators
• Post regulators for switching supplies
• Battery chargers
• 12V to 5V linear regulator
• Motherboard clock supplies

Three fixed output voltages are offered: 2.5V, 3.0V and 3.3V. Output voltages are factory trimmed to within 1% of the nominal value.

In addition to low dropout voltages, the IMP37 family features greatly reduced quiescent operating current. The 75 microampere maximum specification represents an over 100 times improvement over competitive devices.

Devices are short circuit protected, and a thermal protection circuit shuts the regulator off should the junction temperature exceed 165°C.

The IMP37 is available in low-profile plastic SOT-223 and TO-263 packages. The IMP37 is pin compatible with fixed "1117" devices with input voltage levels up to 5.5V

• Low Dropout Voltage
  - 0.8V maximum at 100mA
  - 0.95V maximum at 800mA
  - Reduced Quiescent Current: 75μA Maximum
  - 20% lower dropout voltage than "1117" LDO regulators
  
  
• Guaranteed Low Dropout Voltage at Multiple Current Levels
• 1% Trimmed 2.5V, 3.0V and 3.3V Outputs
• Reduced Quiescent Current: 75μA Maximum
• Short Circuit and Thermal Protection
• Space Saving SOT-223 Surface Mount Package
• "1117" Pin Compatible
• up to 5.5V input voltage

• High-efficiency linear power supplies
• Post regulator for switching supplies
• 5V to 3.3V linear regulators
• USB hubs
• Battery chargers
• Routers, ISDN/DSL modems and video cards

• High-efficiency linear power supplies
• Post regulator for switching supplies
• 5V to 3.3V linear regulators

The IMP2xxx devices are broken into three families; each designed for exceptionally low dropout voltage. Compared against pin compatible devices available from TelCom Semiconductor, IMP LDOs have up to 41% lower dropout voltage.
All IMP2xxx LDOs have a shutdown mode that cuts current to less than 2 microamperes. Quiescent current under no load is 33 microamperes typically (50 microamperes maximum).

In addition, all devices are designed with thermal and short circuit protection for ruggedness.

There are three families. Each family has 60mA, 110mA and 160mA devices. Each family has different functional capability but the same electrical specifications in terms of dropout voltage performance and quiescent current. All IMP2xxx LDOs have shutdown capability for system power savings.

Two families offer fixed output voltages of 2.5V, 2.7V, 2.85V, 3.0V, 3.3V, 3.6V, and 4.0V.

• IMP2014, IMP2015, and IMP2185 (60mA/110mA/160mA): Fixed Outputs. Includes reference bypass pin for lower noise and the
  best power supply rejection.
• IMP2054, IMP2055, and IMP2186 (60mA/110mA/160mA): Fixed Outputs. Includes Error flag output. One family has adjustable outputs.
• IMP2070, IMP2071, and IMP2187 (60mA/110mA/160mA): Adjustable output voltage (1.2V to 5.5V)

All devices are protected from short circuits, and a thermal protection circuit shuts the regulator off at excessive temperatures.
The IMP2xxx devices are available in 5-pin SOT-23A packages.

• Low Dropout Voltage
• 70mV at 50mA: 41% lower than competition
• 160mV at 100mA: 36 lower than competition
• 250mV at 150mA: 37% lower than competition
• Optimized for Low Voltage Applications
• Fixed 2.5V, 2.7V, 2.85V, 3.0V, 3.3V, 3.6V, and 4.0V Output Options
  - ± 2.5% Over Temperature(Typically ±0.5% at 25°C)
  
• Adjustable Outputs: IMP2070, IMP2071 and IMP2187
• Low Quiescent Current: 50mA Maximum
• Shutdown Mode Cuts Current to Under 2mA at Room Temperature
• Compact 5-pin SOT-23A Surface Mount Package
• IMP Improves Dropout Voltage Performance

• Replace TelCom 50mA Devices: TC1014/54/70 with IMP2014/54/70
• Replace TelCom 100mA Devices: TC1015/55/71with IMP2015/2055/71
• Replace TelCom 150mA Devices: TC1185/6/7 with IMP2185/6/7