6.5 V, 500 mA, Ultralow Noise, High PSRR, Fast Transient Response CMOS LDO Data Sheet ADM7170 FEATURES TYPICAL APPLICATION CIRCUIT Input voltage range: 2.3 V to 6.5 V ADM7170 V = 5V V = 3.3V Maximum load current: 500 mA IN OUT VIN VOUT C C Low noise: 5 V rms independent of output voltage at IN OUT VIN VOUT 4.7F 4.7F SENSE 100 Hz to 100 kHz ON Fast transient response: 1.5 s for 1 mA to 500 mA load step EN SS C SS OFF 60 dB PSRR at 100 kHz 1nF GND Low dropout voltage: 42 mV at 500 mA load, V = 3 V OUT Initial accuracy: 0.75% Figure 1. ADM7170 with Fixed Output Voltage, 3.3 V Accuracy over line, load, and temperature: 1.25% Quiescent current, I = 0.7 mA at no load GND Low shutdown current: 0.25 A at V = 5 V IN Stable with small 4.7 F ceramic output capacitor Inrush current can be controlled by adjusting the start-up time Adjustable and fixed output voltage options: 1.2 V to 5.0 V via the soft start pin. The typical start-up time with a 1 nF soft Adjustable output from 1.2 V to V V IN DO start capacitor is about 1.0 ms. Precision enable Adjustable soft start The ADM7170 regulator output noise is 5 V rms independent 8-lead, 3 mm 3 mm LFCSP package of the output voltage. The ADM7170 is available in an 8-lead, Supported by ADIsimPower tool 3 mm 3 mm LFCSP, making it not only a very compact solution, but also providing excellent thermal performance for APPLICATIONS applications requiring up to 500 mA of output current in a Regulation to noise sensitive applications: ADC and DAC small, low profile footprint. circuits, precision amplifiers, PLLs/VCOs, and clocking ICs T Communications and infrastructure Medical and healthcare Industrial and instrumentation GENERAL DESCRIPTION 1 The ADM7170 is a CMOS, low dropout linear regulator (LDO) that operates from 2.3 V to 6.5 V and provides up to 500 mA of output current. This high output current LDO is ideal for 2 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 F ceramic output B B CH1 200mA CH2 10mV M400ns A CH3 100mV W W T 0.4% capacitor. Load transient response is typically 1.5 s for a 1 mA Figure 2. Transient Response (Trace 2), 1 mA to 500 mA Load Step in 400 ns to 500 mA load step. (Trace 1) The ADM7170 is available in 17 fixed output voltage options. Table 1. Related Devices The following voltages are available from stock: 1.3 V, 1.8 V, Device Input Voltage Output Current Package 2.5 V, 3.0 V, 3.3 V, 4.2 V, and 5.0 V. Additional voltages that are ADM7171 2.3 V to 6.5 V 1 A 8-lead LFCSP available by special order are: 1.5 V, 1.85 V, 2.0 V, 2.2 V, 2.7 V, ADM7172 2.3 V to 6.5 V 2 A 8-lead LFCSP 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. Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20142019 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 12297-001 12297-002ADM7170 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Applications Information .............................................................. 17 Applications ....................................................................................... 1 ADIsimPower Design Tool ....................................................... 17 General Description ......................................................................... 1 Capacitor Selection .................................................................... 17 Typical Application Circuit ............................................................. 1 Programmable Precision Enable .............................................. 18 Revision History ............................................................................... 2 Undervoltage Lockout ............................................................... 18 Specifications ..................................................................................... 3 Soft Start ...................................................................................... 18 Input and Output Capacitor, Recommended Specifications .. 4 Noise Reduction of the ADM7170 in Adjustable Mode ....... 19 Absolute Maximum Ratings ............................................................ 5 Effect of Noise Reduction on Start-Up Time ......................... 19 Thermal Data ................................................................................ 5 Current-Limit and Thermal Overload Protection ................. 19 Thermal Resistance ...................................................................... 5 Thermal Considerations ............................................................ 20 ESD Caution .................................................................................. 5 Typical Applications Circuits .................................................... 21 Pin Configuration and Function Descriptions ............................. 6 Printed Circuit Board Layout Considerations ............................ 22 Typical Performance Characteristics ............................................. 7 Outline Dimensions ....................................................................... 23 Theory of Operation ...................................................................... 16 Ordering Guide .......................................................................... 23 REVISION HISTORY 9/2019Rev. C to Rev. D 12/2014Rev. A to Rev. B Change to Figure 33 Caption ........................................................ 11 Changes to Figure 2 ........................................................................... 1 Change to Figure 34 Caption, Figure 38 Caption, and Figure 39 Changes to Figure 48 to Figure 51 ................................................ 14 Caption ............................................................................................. 12 Changes to Figure 52 to Figure 53 ................................................ 15 Changes to Figure 49 and Figure 51 ............................................. 14 Changes to Figure 56 ...................................................................... 17 Changes to Figure 54 ...................................................................... 16 Changes to Ordering Guide .......................................................... 23 Changes to Figure 56 ...................................................................... 17 Updated Outline Dimensions ....................................................... 23 8/2014Rev. 0 to Rev. A Changes to Ordering Guide .......................................................... 23 8/2015Rev. B to Rev. C Changes to Soft Start Section ........................................................ 19 7/2014Revision 0: Initial Version Added Effect of Noise Reduction on Start-Up Time Section ... 19 Rev. D Page 2 of 23