ADM7171ACPZ-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: 1.3 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. 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

Key features

• 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
• Initial accuracy: - 0.5% (minimum), + 1% (maximum)
• Accuracy over line, load, and temperature: ±1.5%
• Quiescent current, lGND = 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