High Performance LDO Technology
Discover Analog Devices' (ADI) best-in-class ultralow noise low dropout (LDO) linear regulators, setting the industry standard where performance matters most. ADI's LDOs excel in three critical performance pillars:
- Noise and PSRR: Providing unmatched noise suppression across a broad frequency spectrum.
- Low quiescent current: Guaranteeing extended battery life in portable devices.
- Dropout voltage: Ensuring the most efficient regulation even with minimal voltage differential.
For more information on Analog Devices high performance LDO regulators, visit analog.com/LDO.
5.5 V, 3 A Ultralow Noise, High PSRR, 45 mV Dropout Linear Regulator with PMBus®
This regulator is ideal for ultrafast LDO applications in RF power supplies, high speed/high precision data converters, low noise instrumentation, FPGAs, DSP, microprocessors, and medical applications.
Key features include:
- Unity-gain and precision current source reference architecture that allows easy direct output paralleling.
- PMBus-compliant serial interface and commands for control, telemetry, and fault warnings.
Part Number: LT3074
Ultralow Noise LDO Voltage Regulators
Industry's lowest noise 20 V LDO with just 0.8 μV rms. These regulators enable systems to perform at their peak without the interference of power supply noise by minimizing phase noise in PLLs, reducing jitter in clock generators, and ensuring stability in VCOs.
Lowest Noise LDO Voltage Regulators
| Part Number | VIN Max (V) | VOUT Range (V) | IOUT Max (A) | IO (mA) | PSRR (dB) 100 kHz | Noise (µV rms) | AEC-0100 | Enable | VOUT Control | Package (mm) |
|---|---|---|---|---|---|---|---|---|---|---|
| ADP151 | 2.2 to 5.5 | 1.1 to 3.3 | 0.2 | 0.01 | 55 | 9 | Yes | Yes | Fixed | 0.8 x 0.8, 4-ball WLCSP; 2 x 2, 6-lead LFCSP; 5-lead TSOT |
| ADM7170 | 2.3 to 6.5 | 1.2 to 6.4 | 0.5 | 0.7 | 60 | 5 | No | Yes | Fixed/voltage divider | 3 x 3, 8-lead LFCSP |
| ADM7155/ADM7154 | 2.3 to 5.5 | 1.2 to 3.4 | 0.6 | 4 | 95 | 1.6 | No | Yes | Fixed/voltage divider | 3 x 3, 8-lead LFCSP; 8-lead SOIC |
| MAX38914/MAX38913 | 1.8 to 5.5 | 0.6 to 5 | 1 | 1.37 | 60 | 4 | No | Yes | Fixed/digital pins | 1.9 x 1.3, 12-ball WLP; 3x3, 12-lead TDFN |
| ADP1761 | 1.1 to 1.98 | 0.5 to 1.5 | 1 | 4.5 | 51 | 2 | Yes | Yes | Fixed and single resistor | 3x3, 16-lead LFCSP |
| ADP1762 | 1.1 to 1.98 | 0.5 to 1.5 | 2 | 4.5 | 46 | 2 | Yes | Yes | Fixed and single resistor | 3x3, 16-lead LFCSP |
| ADP1763 | 1.1 to 1.98 | 0.5 to 1.5 | 3 | 4.5 | 43 | 2 | Yes | Yes | Fixed and single resistor | 3 x 3, 16-lead LFCSP |
| LT3074 | 0.6 to 5.5 | 0.1 to 5.5 | 3 | 4.6 | 55 | 1.2 | No | Yes | Single resistor | 3 x 4, 22-lead LOFN |
| LT3073 | 0.6 to 5.5 | 0.5 to 4.2 | 3 | 4.3 | 55 | 1.2 | No | Yes | Digital pins | 3 x 4, 22-lead LOFN |
| LT3077 | 0.6 to 5.5 | 0.5 to 4.2 | 3 | 4.3 | 53 | 1.2 | No | Yes | Digital pins | 3 x 3, 18-lead LFCSP |
| ADP1764 | 1.1 to 1.98 | 0.5 to 1.5 | 4 | 5 | 46 | 2 | No | Yes | Fixed and single resistor | 3 x 3, 16-lead LFCSP |
| ADP1765 | 1.1 to 1.98 | 0.5 to 1.5 | 5 | 5 | 43 | 2 | No | Yes | Fixed and single resistor | 3x3, 16-lead LFCSP |
| LT3078 | 0.6 to 5.5 | 0.5 to 4.2 | 5 | 4.3 | 50 | 1.3 | No | Yes | Digital pins | 3 x 4, 22-lead LOFN |
Ultralow Noise LDO Voltage Regulators (Continued)
| Part Number | VIN Max (V) | VOUT Range (V) | IOUT Max (A) | IO (mA) | PSRR (dB) 100 kHz | Noise (µV rms) | AEC-0100 | Enable | VOUT Control | Package (mm) |
|---|---|---|---|---|---|---|---|---|---|---|
| LT3040 | 1.8 to 20 | 0 to 15 | 0.2 | 2.5 | 75 | 1.2 | No | Yes | Single resistor | 3x3, 10-lead DFN |
| LT3042 | 2 to 20 | 0 to 15 | 0.2 | 2 | 78 | 0.8 | Yes | Yes | Single resistor | 3 x 3, 10-lead DFN |
| LT3046 | 2.2 to 20 | 0.2 to 19 | 0.2 | 3.7 | 81 | 0.8 | No | Yes | Single resistor | 3 x 3, 12-lead DFN; 1.6 x 1.7, 11-ball WLSCP |
| LT3045/LT3045-1 | 2 to 20 | 0 to 15 | 0.5 | 2.2 | 77 | 0.8 | Yes | Yes | Single resistor | 3 x 3, 10-lead DFN; 12-lead MSOP |
| ADM7150/ADM7151 | 4.5 to 16 | 1.5 to 5.1 | 0.8 | 4.3 | 91 | 1.6 | No | Yes | Fixed/voltage divider | 8-lead LFCSP; 8-lead SOIC |
| LT3041 | 2.2 to 20 | 0.2 to 15 | 1 | 4.3 | 77 | 1 | No | Yes | Single resistor | 4 x 3, 14-lead DFN |
| ADP7142 | 2.7 to 40 | 1.2 to 39.8 | 0.2 | 0.05 | 68 | 11 | Yes | Yes | Fixed/voltage divider | 2 × 2, 6-lead LFCSP; 8-lead SOIC; 5-lead TSOT |
| LT3065/LT3066 | 1.8 to 45 | 0.6 to 19 | 0.5 | 0.055 | 54 | 25 | Yes | Yes | Fixed/voltage divider | 3x4, 12-lead DFN; 12-lead MSOP |
| LT3088/LT3089 | 1.2 to 36 | 0 to 34.5 | 0.8 | 0.05 | 32 | 27 | No | No | Fixed/single resistor | 4 x 4, 12-lead, DFN; 16-lead TSSOP; 7-lead DD-Pak |
| LT3081 | 1.2 to 36 | 0 to 34.5 | 1.5 | 0.05 | 28 | 27 | No | No | Fixed/single resistor | 4 x 4, 12-lead, DFN; 16-lead TSSOP; 7-lead DD-Pak; 7-lead TO-220 |
| LT3061 | 1.6 to 45 | 3.3 to 19 | 0.1 | 0.045 | 28 | 30 | No | Yes | Fixed/voltage divider | 2 x 3, 8-lead DFN; 8-lead MSOP |
| LT3062/LT3063 | 1.6 to 45 | 0.6 to 40 | 0.2 | 0.045 | 30 | 30 | No | Yes | Fixed/voltage divider | 2 x 3, 8-lead DFN; 8-lead MSOP |
| LT3065/LT3066 | 1.6 to 45 | 0.6 to 40 | 0.5 | 0.055 | 18 | 25 | Yes | Yes | Fixed/voltage divider | 3x3, 10-lead DFN; 12-lead MSOP |
| ADP7183 | -5.5 to -2 | -0.5 to -5 | 0.3 | 0.6 | 50 | 4 | No | Yes | Fixed and voltage divider | 2 x 2, 8-lead LFCSP |
| ADP7185 | -5.5 to -2 | -0.5 to -5 | 0.5 | 0.6 | 50 | 5 | No | Yes | Fixed and voltage divider | 2 × 2, 8-lead LFCSP |
| LT3093 | -1.8 to -20 | 0 to -19.5 | 0.2 | 2.35 | 76 | 0.8 | No | Yes | Voltage divider | 6 x 3, 22-lead DFN |
| LT3094 | -1.8 to -20 | 0 to -19.5 | 0.5 | 2.35 | 75 | 0.8 | No | Yes | Voltage divider | 6 x 3, 22-lead DFN |
| LT3091 | -1.5 to -36 | 0 to -32 | 1.5 | 1.2 | 35 | 18 | No | Yes | Single resistor | 4 x 3, 14-lead DFN; 16-lead TSSOP; 7-lead TO-220 |
Ultralow Quiescent Current LDOs
These LDOs are crucial for applications where energy efficiency is paramount. They consume less power when in standby or idle mode, extending battery life. They are ideal for applications such as IoT devices, wearables, and portable electronics. Low quiescent current (IQ) LDOs improve efficiency in low power circuits for industrial, automotive, and battery-powered systems.
Discharge Time of 1-Cell Li-Ion 900 mAh Battery
The table below illustrates the discharge time comparison:
| Load (mA) | IQ (μA) | Discharge Time (h) | ADP162 | LDO1 | LDO2 |
|---|---|---|---|---|---|
| 5 | 5 | 806 | 5 | 5 | 5 |
| 100 | 5 | 735 | 100 | 100 | 100 |
| 1000 | 5 | 405 | 405 | 405 | 405 |
Note: LDO1 and LDO2 serve as examples of LDOs with higher quiescent current, illustrating their effect on battery operating time.
Ultralow Quiescent Current LDO Voltage Regulators
| Part Number | VIN Range (V) | VOUT Range (V) | IOUT Max (A) | IQ (μA) | PSRR (dB) 100 kHz | Noise (µV rms) | VOUT Control | Package (mm) |
|---|---|---|---|---|---|---|---|---|
| ADP165/ADP166 | 2.2 to 5.5 | 1.2 to 3.3 | 0.15 | 0.59 | 32 | 105 | Fixed | 5-lead TSOT; 2 x 2, 6-lead LFCSP; 4-ball WLCSP |
| ADP162/ADP163 | 2.2 to 5.5 | 1 to 4.2 | 0.15 | 0.59 | 32 | 100 | Fixed/voltage divider | 5-lead TSOT; 2 x 2, 6-lead LFCSP; 4-ball WLCSP |
| ADP151 | 2.2 to 5.5 | 1.1 to 3.3 | 0.2 | 10 | 55 | 9 | Fixed | 5-lead TSOT; 2 x 2, 6-lead LFCSP; 4-ball WLCSP |
| MAX38911/MAX38912 | 1.7 to 5.5 | 0.8 to 5 | 0.5 | 20 | 60 | 11 | Fixed/voltage divider | 2 x 2, 8-lead TDFN; 6-ball WLP |
| MAX1725/MAX1726 | 2.5 to 12 | 1.5 to 5 | 0.02 | 2 | 52 | 350 | Fixed/voltage divider | 5-lead SOT-23 |
| LT3009 | 1.6 to 20 | 0.6 to 19.5 | 0.02 | 3 | 32 | 150 | Fixed/voltage divider | 2 x 2, 6-lead DFN; 8-lead SC70 |
| ADPL42001 | 4 to 20 | 0.6 to 18 | 0.1 | 8 | 45 | - | Fixed/voltage divider | 3x3, 6-lead TDFN; 6-lead TSOT; 6-lead SOT-23 |
| MAX8880/MAX8881 | 2.5 to 12 | 1.25 to 5 | 0.2 | 3.5 | - | 300 | Fixed/voltage divider | 3x3, 6-lead TDFN; 6-lead TSOT; 8-lead MSOP; 8-lead SOIC; 3-lead SOT-223 |
| LT1521 | 4.3 to 20 | 3 to 19.5 | 0.3 | 12 | 33 | - | Fixed/voltage divider | 6-lead TDFN; 8-lead SOIC |
| MAX604 | 2.7 to 11.5 | 1.25 to 11 | 0.5 | 15 | 41 | 250 | Fixed/voltage divider | 8-lead DIP; 8-lead SOIC; 3 × 3, 6-lead TDFN; 6-lead TSOT; 5-lead SOT-23 |
| ADPL44001 | 4 to 40 | 0.6 to 38 | 0.1 | 8 | 45 | - | Fixed/voltage divider | 8-lead DIP; 8-lead SOIC; 3 × 3, 6-lead TDFN; 6-lead TSOT; 5-lead SOT-23 |
| MAX1615/MAX1616 | 4 to 28 | 1.24 to 28 | 0.03 | 6.2 | 35 | - | Fixed/voltage divider | 5-lead SOT-23 |
| MAX664 | -2 to -16.5 | -1.3 to -15 | 0.04 | 12 | 20 | - | Fixed/voltage divider | 3 x 3, 8-lead DFN; 8-lead DIP; 8-lead SOIC |
| LT1964 | -1.9 to -20 | -1.22 to -20 | 0.2 | 30 | 27 | 30 | Fixed/voltage divider | 5-lead SOT-23 |
Very Low Dropout Voltage Regulators
These regulators offer the ability to efficiently regulate with minimal voltage difference between input and output. This results in reduced power consumption due to smaller voltage difference loss, maximizing battery life and enhancing power efficiency, especially when the battery voltage approaches the output voltage level.
Diagram: Generation of Heat Loss
The diagram illustrates the input and output power, current, and voltage for a linear regulator, showing the heat loss.
- Input Side: Power = 15 W, Input Voltage (VIN) = 5.0 V, Input Current = 3 A
- Output Side: Power = 14.865 W, Output Voltage (VOUT) = 4.955 V, Output Current = 3 A
- Heat Loss = 0.135 W, Dropout Voltage (DC) = 45 mV
Very Low Dropout Voltage Regulators
| Part Number | VIN Range (V) | VOUT Range (V) | IOUT Max (A) | LDO (mV) | PSRR (dB) 100 kHz | Noise (µV rms) | VOUT Control | Package (mm) |
|---|---|---|---|---|---|---|---|---|
| LTC3025 | 0.9 to 5.5 | 0.4 to 3.6 | 0.3 | 45 | 48 | 80 | Voltage divider | 2x 2, 6-lead DFN; 2x 2, 8-lead TDFN; 6-ball WLP |
| MAX38902A/MAX38902B/MAX38902C/MAX38902D | 1.7 to 5.5 | 0.6 to 5.3 | 0.5 | 50 | 60 | 10.5 | Fixed/digital pins/voltage divider | 2x 2, 8-lead TDFN; 6-ball WLP |
| MAX38902E | 1.7 to 5.5 | 0.8 to 5 | 0.5 | 50 | 45 | 10.5 | Fixed/voltage divider | 2x 2, 8-lead TDFN |
| ADM7170 | 2.3 to 6.5 | 1.2 to 5 | 0.5 | 42 | 60 | 5 | Voltage divider | 3 x 3, 8-lead LFCSP |
| MAX38913/MAX38914 | 1.8 to 5.5 | 0.6 to 5 | 1 | 28 | 60 | 4 | Fixed/voltage divider | 3x3, 12-lead TDFN; 12-ball WLP |
| MAX38909 | 0.9 to 5.5 | 0.6 to 5 | 2 | 42 | 42 | 21.2 | Fixed/digital pins | 3 x 3, 14-lead TDFN; 15-ball WLP |
| LT3073/LT3074 | 0.6 to 5.5 | 0.5 to 4.2 | 3 | 45 | 58 | 1.2 | Digital pins/single resistor | 3 x 4, 22-lead LOFN |
| ADP1764 | 1.1 to 1.98 | 0.5 to 1.5 | 4 | 47 | 46 | 2 | Fixed/single resistor | 3 x 3, 16-lead LFCSP |
| LT3020 | 0.9 to 10 | 0.2 to 9.7 | 0.1 | 150 | 20 | 245 | Fixed/voltage divider | 3 x 3, 8-lead DFN; 8-lead MSOP |
| ADP7112/ADP7118 | 2.7 to 20 | 1.2 to 19.8 | 0.2 | 200 | 68 | 11 | Fixed/voltage divider | 6-ball WLCSP; 2 x 2, 6-lead LFCSP; 8-lead SOIC; 5-lead TSOT |
| ADP7102 | 3.3 to 20 | 1.2 to 19.8 | 0.3 | 200 | 50 | 15 | Fixed/voltage divider | 3 × 3, 8-lead LFCSP; 5x5, 16-lead DFN; 8-lead SOIC |
| LT3021 | 0.9 to 10 | 0.2 to 9.7 | 0.5 | 155 | 45 | 300 | Fixed/voltage divider | 3 x 3, 8-lead LFCSP; 5x5, 16-lead DFN; 8-lead SOIC |
| LT3022 | 0.9 to 10 | 0.2 to 9.7 | 1 | 145 | 42 | 165 | Fixed/voltage divider | 5 x 3, 16-lead DFN; 16-lead MSOP |
| LT3033 | 0.95 to 10 | 0.2 to 9.7 | 3 | 95 | 30 | 160 | Voltage divider | 3 x 4, 20-lead OFN |
| LT3007/LT3008 | 2 to 45 | 0.6 to 44.5 | 0.02 | 300 | 33 | 92 | Fixed/voltage divider | 8-lead SOT-23; 2 x 2, 6-lead DFN; 8-lead MSOP |
| ADP1720 | 4 to 28 | 1.22 to 5 | 0.05 | 275 | 52 | 124 | Fixed/voltage divider | 8-lead MSOP |
| LT3060/LT3061 | 1.6 to 45 | 0.6 to 19 | 0.1 | 250 | 28 | 30 | Fixed/voltage divider | 2 x 3, 8-lead DFN; 8-lead MSOP |
| ADP7142 | 2.7 to 40 | 1.2 to 39.8 | 0.2 | 200 | 68 | 11 | Fixed/voltage divider | 2 × 2, 5-lead LFCSP; 8-lead SOIC; 5-lead TSOT |
| LT3065/LT3066 | 1.8 to 45 | 0.6 to 19 | 0.5 | 300 | 22 | 25 | Fixed/voltage divider | 3 x 4, 12-lead DFN; 12-lead MSOP |
| MAX1735 | -2.5 to -6.5 | -1.25 to -5.5 | 0.2 | 85 | 28 | 160 | Fixed/voltage divider | 5-lead SOT-23 |
| ADP7183 | -2 to -5.5 | -0.5 to -5 | 0.3 | 600 | 62 | 4 | Fixed/voltage divider | 8-lead LFCSP |
| LT3093 | -1.8 to -20 | 0 to -19.5 | 0.2 | 10 | 77 | 0.8 | Voltage divider | 6 x 3, 22-lead DFN |
| ADP7185 | -2 to -5.5 | -0.5 to -5 | 0.5 | 600 | 50 | 4 | Fixed | 2 x 2, 8-lead LFCSP |
Power Management Tools
Analog Devices offers complete power management tools to make designing power systems and circuits easier with good quality. Use the LTpowerPlanner tool for system-level power tree design, start with the LTpowerCAD® tool to find solutions and optimize supply designs, and use LTspice® for circuit simulations.
LTpowerPlanner: System Level Power Tree
LTpowerCAD: Search/Select a Solution, Circuit Parameter Design
LTspice: Simulation
LTpowerPlay: System Evaluation/Debug
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