ADP124 5.5V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulator with 31 Fixed-output Voltages

The ADP124/ADP125 are low quiescent current, low dropout linear regulators. They are designed to operate from an input voltage between 2.3 V and 5.5 V and to provide up to 500 mA of output current. The low 130 mV dropout voltage at a 500 mA load improves efficiency and allows operation over a wide input voltage range. Applications

The low 210 μA of quiescent current with a 500 mA load makes the ADP124/ADP125 ideal for battery-operated portable equipment. The ADP124 is capable of 31 fixed-output voltages from 1.75 V to 3.3 V. The ADP125 is the adjustable version of the device and allows the output voltage to be set between 0.8 V and 5.0 V by an external voltage divider. The ADP124/ADP125 are specifically designed for stable operation with tiny 1 μF ceramic input and output capacitors to meet the requirements of high performance, space constrained applications.

The ADP124/ADP125 have an internal soft start that gives a constant start-up time of 350 μs. Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP124/ADP125 are available in an 8-lead exposed paddle MSOP package. When compared with the standard MSOP package, the exposed paddle MSOP package has lower thermal resistance (θJA). The lower thermal resistance package allows the ADP124/ADP125 to meet the needs of a variety of portable applications while minimizing the rise in junction temperature.

Features and Benefits
  • Input voltage supply range: 2.3 V to 5.5 V
  • 500 mA maximum output current
  • Fixed and adjustable output voltage versions
  • 1% initial accuracy
  • Up to 31 fixed-output voltage options available from 1.75 V to 3.3 V
  • Adjustable-output voltage range from 0.8 V to 5.0 V
  • Very low dropout voltage: 130 mV
  • Low quiescent current: 45 μA
  • Low shutdown current: <1 μA
  • Excellent PSRR performance: 60 dB at 100 kHz
  • Excellent load/line transient response
  • See data sheet for additional features
Power Management
Design Tools
Data Sheets
Documentnote
ADP124/ADP125: 5.5 V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulators Datasheet (Rev. D)PDF 669 kB
Application Notes
Documentnote
AN-1072: How to Successfully Apply Low Dropout RegulatorsPDF 105 kB
User Guides
Documentnote
UG-148: RedyKit for the ADP124 LDOPDF 151 kB
UG-056: Setting Up the Evaluation Board for the ADP124/ADP125PDF 317 kB
Frequently Asked Questions
Documentnote
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
ADP124ACPZ-1.8-R7 Production8 ld LFCSP (2x2mm w/1.6x1.0 EP)REEL 3000-40 to 125C00.42Y
ADP124ACPZ-2.8-R7 Production8 ld LFCSP (2x2mm w/1.6x1.0 EP)REEL 3000-40 to 125C00.42Y
ADP124ACPZ-2.9-R7 Production8 ld LFCSP (2x2mm w/1.6x1.0 EP)REEL 3000-40 to 125C00.42Y
ADP124ACPZ-3.0-R7 Production8 ld LFCSP (2x2mm w/1.6x1.0 EP)REEL 3000-40 to 125C00.42Y
ADP124ACPZ-3.3-R7 Production8 ld LFCSP (2x2mm w/1.6x1.0 EP)REEL 3000-40 to 125C00.42Y
ADP124ARHZ-1.8-R7 Production8 ld MSOP_EDREEL 1000-40 to 125C00.68Y
ADP124ARHZ-2.5-R7 Production8 ld MSOP_EDREEL 1000-40 to 125C00.68Y
ADP124ARHZ-2.7-R7 Production8 ld MSOP_EDREEL 1000-40 to 125C00.68Y
ADP124ARHZ-2.8-R7 Production8 ld MSOP_EDREEL 1000-40 to 125C00.68Y
ADP124ARHZ-2.85-R7 ProductionEXPOSSED PAD SOICREEL 1000-40 to 125C00.68Y
ADP124ARHZ-2.9-R7 Production8 ld MSOP_EDREEL 1000-40 to 125C00.68Y
ADP124ARHZ-3.0-R7 Production8 ld MSOP_EDREEL 1000-40 to 125C00.68Y
ADP124ARHZ-3.3-R7 Production8 ld MSOP_EDREEL 1000-40 to 125C00.68Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
ADP124CPZ-REDYKITEvaluation Board45Y
EVAL-ADICUP360Evaluation Board45Y
ADP124/ADP125: 5.5 V Input, 500 mA, Low Quiescent Current, CMOS Linear Regulators Datasheet (Rev. D) adp124
ADI Linear Regulator Design Tool and Parametric Search adp2108
AN-1072: How to Successfully Apply Low Dropout Regulators adp2108
AN-1072: 在系统中成功运用低压差稳压器 (Rev. 0) adp2108
UG-148: RedyKit for the ADP124 LDO adp124
UG-056: Setting Up the Evaluation Board for the ADP124/ADP125 adp124