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Low Dropout Voltage Regulators

IMP1117A LDO, 1A high current Linear Low Dropout Regulator

  • . High regulation current: 1000mA

IMP37 LDO, 0.95V Dropout Voltage at 0.8A Output

  • Reduced Quiescent Current: 75 Maximum

IMP2014, IMP2015, IMP2185

  • Fixed Outputs. Includes reference bypass pin for lower noise and the best power supply rejection.

IMP2054. IMP2055, IMP2186

  • Fixed Outputs. Includes Error flag output. One family has adjustable outputs.

IMP2070, IMP2071, IMP2187

  • Adjustable output voltage (1.2V to 5.5V)

IMP1117A LDO with 1000mA Output

The IMP1117A and IMP1117A-1.8, -2.5, -2.85, -3.3 and C5 are low dropout three-terminal regulators with 1A output current capability. These devices have been optimized for low voltage where transient response and minimum input voltage are critical. The 2.85V version is designed specifically to be used in Active Terminators for SCSI bus.

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.

Key Features

  • 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
Applications
  • Active SCSI terminators
  • High efficiency linear regulators
  • Post regulators for switching supplies
  • Battery chargers
  • 12V to 5V linear regulator
  • Motherboard clock supplies
Data Sheets
 
IMP1117A

 

IMP37 LDO with 800mA Output

The IMP37 Low Dropout (LDO) three-terminal voltage regulators feature guaranteed low dropout voltages at currents up to 0.8A. The IMP37 dropout voltage is guaranteed to be 0.95V or lower at 0.8A. At 100mA, the maximum dropout voltage is 0.8V. Compared with "1117" type LDOs, the IMP37 has a 20% lower dropout voltage.

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 165C.

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

Key Features

  • 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
Applications
  • 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
Data Sheets
 
IMP37 LDO

 

IMP2xxx LDOs

  • IMP2014, IMP2015, IMP2185 LDOs with Reference Bypass Pin
  • IMP2054, IMP2055, IMP2186 LDOs with Error Flag Output
  • IMP2070, IMP2071, IMP2187 LDOs Adjustable Output
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.
 

Family Features

  • 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 25C)
  • 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
     
Parameter
IMP2014
TelCom TC1014
IMP Improvement
Drop Out Voltage 
70mV
120mV
41%
Maximum Quiescent Current
50mA
80mA
38% 
Minimum Output Current 
60mA
50mA
20% 

Pin Compatible upgrades for TelCom Semiconductor LDOs

  • 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
IMP2xxx LDO Family Selection Guide
 
IMP Base Part Number
Output Voltage 
Minimum Output Current (mA)
Shutdown Pin
Adjust Pin
Error Flag Output
Reference Bypass Pin
Telcom Equivalent
IMP2014
Fixed Options(7)
60
X
X
TC1014
IMP2015
Fixed Options(7)
110
X
X
TC1015
IMP2054
Fixed Options(7)
60
X
X
TC1054
IMP2055
Fixed Options(7)
110
X
X
TC1055
IMP2070
Adjustable
60
X
X
TC1070
IMP2071
Adjustable
110
X
X
TC1071
IMP2185
Fixed Options(7)
160
X
X
TC1185
IMP2186
Fixed Options(7)
160
X
X
TC1186
IMP2187
Adjustable
160
X
TC1187

Notes:
1. Fixed Output Voltage Options are: 2.5V, 2.7V, 2.85V, 3.0V, 3.3V, 3.6V, and 4.0V.
2. IMP2070, IMP2071 and IMP2187 have adjustable outputs.

Data Sheets and Selection Guide
 
IMP2014, IMP2015, IMP2185 LDOs with Reference Bypass Pin
IMP2054. IMP2055, IMP2186 LDOs with Error Flag Output
IMP2070, IMP2071, IMP2187 LDOs Adjustable Output
LDO Selection Guide

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