ADM7171 6.5 V, 1 A, Ultralow Noise, High PSRR, Fast Transient Response CMOS LDO
The ADM7171 is available in 17 fixed output voltage options. The following voltages are available from stock: 1.3 V, 1.8 V, 2.5 V, 3.0 V, 3.3 V, 4.2 V, and 5.0 V. Additional voltages that are available by special order are: 1.5 V, 1.85 V, 2.0 V, 2.2 V, 2.7 V, 2.75 V, 2.8 V, 2.85 V, 3.8 V, and 4.6 V. An adjustable version is also available that allows output voltages that range from 1.2 V to VIN − VDO with an external feedback divider.
The ADM7171 is a CMOS, low dropout linear regulator (LDO) that operates from 2.3 V to 6.5 V and provides up to 1 A of output current. This high output current LDO is ideal for regulation of high performance analog and mixed signal circuits operating from 6 V down to 1.2 V rails. Using an advanced proprietary architecture, the device provides high power supply rejection and low noise, and achieves excellent line and load transient response with just a small 4.7 μF ceramic output capacitor. Load transient response is typically 1.5 μs for a 1 mA to 500 mA load step.
Inrush current can be controlled by adjusting the start-up time via the soft start pin. The typical start-up time with a 1 nF soft start capacitor is 1.0 ms.
The ADM7171 regulator output noise is 5 μV rms independent of the output voltage. The ADM7171 is available in an 8-lead, 3 mm × 3 mm LFCSP, making it not only a very compact solution, but also providing excellent thermal performance for applications requiring up to 1 A of output current in a small, low profile footprint.
Applications
- Regulation to noise sensitive applications: ADC and DAC circuits, precision amplifiers, PLLs/VCOs, and clocking ICs
- Communications and infrastructure
- Medical and healthcare
- Industrial and instrumentation
Features and Benefits- Input voltage range: 2.3 V to 6.5 V
- Maximum load current: 1 A
- Low noise: 5 μV rms independent of output voltage at 100 Hz to 100 kHz
- Fast transient response: 1.5 μs for 1 mA to 500 mA load step
- 60 dB PSRR at 100 kHz
- Low dropout voltage: 42 mV at 500 mA load, VOUT = 3 V
- Initial accuracy: −0.5% (minimum), +1% (maximum)
- Accuracy over line, load, and temperature: ±1.5%
- Quiescent current, IGND = 0.7 mA with no load
- Low shutdown current: 0.25 μA at VIN = 5 V
- Stable with small 4.7 μF ceramic output capacitor
- See data sheet for additional features
| Design Tools |
Data Sheets
Application Notes
User Guides
Order Information
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|
| ADM7171ACPZ-1.3-R7 Production | 8 ld LFCSP (3x3mm 2.44x1.6EP) | REEL 1500 | -40 to 125C | 0 | 1.19 | Y |
| ADM7171ACPZ-1.8-R7 Production | 8 ld LFCSP (3x3mm 2.44x1.6EP) | REEL 1500 | -40 to 125C | 0 | 1.19 | Y |
| ADM7171ACPZ-2.5-R7 Production | 8 ld LFCSP (3x3mm 2.44x1.6EP) | REEL 1500 | -40 to 125C | 0 | 1.19 | Y |
| ADM7171ACPZ-3.0-R7 Production | 8 ld LFCSP (3x3mm 2.44x1.6EP) | REEL 1500 | -40 to 125C | 0 | 1.19 | Y |
| ADM7171ACPZ-3.3-R7 Production | 8 ld LFCSP (3x3mm 2.44x1.6EP) | REEL 1500 | -40 to 125C | 0 | 1.19 | Y |
| ADM7171ACPZ-4.2-R7 Production | 8 ld LFCSP (3x3mm 2.44x1.6EP) | REEL 1500 | -40 to 125C | 0 | 1.19 | Y |
| ADM7171ACPZ-5.0-R7 Production | 8 ld LFCSP (3x3mm 2.44x1.6EP) | REEL 1500 | -40 to 125C | 0 | 1.19 | Y |
| ADM7171ACPZ-R2 Production | 8 ld LFCSP (3x3mm 2.44x1.6EP) | REEL 250 | -40 to 125C | 1.43 | 1.43 | Y |
| ADM7171ACPZ-R7 Production | 8 ld LFCSP (3x3mm 2.44x1.6EP) | REEL 1500 | -40 to 125C | 0 | 1.19 | Y |
Evaluation Boards
| Part Number | Description | Price | RoHS |
|---|
| AD-FREQCVT1-EBZ | Evaluation Board | 349 | Y |
| ADM7170CP-EVALZ | Evaluation Board | 49 | Y |
| ADM7171CP-EVALZ | Evaluation Board | 49 | Y |
| ADM7172CP-EVALZ | Evaluation Board | 49 | Y |
| AD-PZSDR2400TDD-EB | Evaluation Board | 399.99 | Y |
Reference Materials
