ADI ADM7171ACPZ-1.8-R7

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.

The ADM7171 is available in 17 fixed output voltage options. The following voltages are available from stock: 1.3V, 1.8V, 2.5V, 3.0V, 3.3V, 4.2V, and 5.0V. Additional voltages that are available by special order are: 1.5V, 1.85V, 2.0V, 2.2V, 2.7V, 2.75V, 2.8V, 2.85V, 3.8V, and 4.6V. An adjustable version is also available that allows output voltages that range from 1.2 V to VIN - VDO with an external feedback divider.

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 1.0ms

The ADM7171 regulator output noise is 5μV rms independent of the output voltage. The ADM7171 is available in an 8 - lead, 3mmx3mm 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.

• 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
• Adjustable and fixed output voltage options: 1.2 V to 5.0 V
• Adjustable output from 1.2 V to VIN - VDO
• Precision enable
• Adjustable soft start
• 8 - lead, 3 mm × 3 mm LFCSP package
• Supported by ADIsimPower tool

• 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