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ADM7172ACPZ-4.2-R7 bảng dữ liệu(PDF) 1 Page - Analog Devices |
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1 / 24 page 6.5 V, 2 A, Ultralow Noise, High PSRR, Fast Transient Response CMOS LDO Data Sheet ADM7172 Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2014–2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Input voltage range: 2.3 V to 6.5 V Maximum load current: 2 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 1.5 A load step 60 dB PSRR at 100 kHz Low dropout voltage: 172 mV at 2 A 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 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 GENERAL DESCRIPTION The ADM7172 is a CMOS, low dropout linear regulator (LDO) that operates from 2.3 V to 6.5 V and provides up to 2 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 1.5 A load step. The ADM7172 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. TYPICAL APPLICATION CIRCUIT VOUT SENSE SS VIN EN ADM7172 GND VIN VOUT CSS 1nF CIN 4.7µF COUT 4.7µF OFF ON VIN = 5V VOUT = 3.3V Figure 1. ADM7172 with Fixed Output Voltage, 3.3 V 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 ADM7172 regulator output noise is 5 μV rms, independent of the output voltage. The ADM7172 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 2 A of output current in a small, low profile footprint. CH1 1.0A ΩBW CH2 20mV BW M400ns A CH3 100mV T 0.0% 1 2 T Figure 2. Transient Response (Trace 2), 1 mA to 1.5 A Load Step in 400 ns (Trace 1) Table 1. Related Devices Device Input Voltage Output Current Package ADM7170 2.3 V to 6.5 V 500 mA 8-lead LFCSP ADM7171 2.3 V to 6.5 V 1 A 8-lead LFCSP |
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