Datasheet ADM7171 (Analog Devices)

6.5 V, 1 A, Ultralow Noise, High PSRR, Fast Transient Response CMOS LDO Data Sheet ADM7171 FEATURES TYPICAL APPLICATION CIRCUIT Input voltage range: 2.3 V to 6.5 V ADM7171 V Maximum load current: 1 A IN = 5V VOUT = 3.3V VIN VOUT C C Low noise: 5 μV rms independent of output voltage at IN VIN VOUT OUT 4.7µF 4.7µF SENSE 100 Hz to 100 kHz ON Fast transient response: 1.5 μs for 1 mA to 500 mA load step EN SS C OFF SS 60 dB PSRR at 100 kHz GND 1nF
001
Low dropout voltage: 42 mV at 500 mA load, V
8-
OUT = 3 V
1229
Initial accuracy: −0.5% (minimum), +1% (maximum)
Figure 1. ADM7171 with Fixed Output Voltage, 3.3 V
Accuracy over line, load, and temperature: ±1.5% Quiescent current, I
The ADM7171 regulator output noise is 5 μV rms independent
GND = 0.7 mA with no load Low shutdown current: 0.25 μA at V
of the output voltage. The ADM7171 is available in an 8-lead,
IN = 5 V Stable with small 4.7 μF ceramic output capacitor
3 mm × 3 mm LFCSP, making it not only a very compact solution,
Adjustable and fixed output voltage options: 1.2 V to 5.0 V
but also providing excellent thermal performance for applications
Adjustable output from 1.2 V to V
requiring up to 1 A of output current in a small, low profile
IN − VDO Precision enable
footprint.
Adjustable soft start T 8-lead, 3 mm × 3 mm LFCSP package Supported by ADIsimPower tool APPLICATIONS Regulation to noise sensitive applications: ADC and DAC 1 circuits, precision amplifiers, PLLs/VCOs, and clocking ICs Communications and infrastructure Medical and healthcare 2 Industrial and instrumentation GENERAL DESCRIPTION
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 002
CH1 200mA ΩBW CH2 10mV BW M400ns A CH3 100mV
98-
T 0.40%
current. This high output current LDO is ideal for regulation of 122 high performance analog and mixed signal circuits operating Figure 2. Transient Response (Trace 2), 1 mA to 500 mA Load Step in 400 ns (Trace 1) from 6 V down to 1.2 V rails. Using an advanced proprietary architecture, the device provides high power supply rejection and
Table 1. Related Devices
low noise, and achieves excellent line and load transient response
Device Input Voltage Output Current Package
with just a small 4.7 μF ceramic output capacitor. Load transient ADM7170 2.3 V to 6.5 V 500 mA 8-lead LFCSP response is typically 1.5 μs for a 1 mA to 500 mA load step. ADM7172 2.3 V to 6.5 V 2 A 8-lead LFCSP 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.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS INPUT AND OUTPUT CAPACITOR, RECOMMENDED SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL DATA THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION APPLICATIONS INFORMATION ADIsimPOWER DESIGN TOOL CAPACITOR SELECTION Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties PROGRAMMABLE PRECISION ENABLE UNDERVOLTAGE LOCKOUT SOFT START NOISE REDUCTION OF THE ADM7171 IN ADJUSTABLE MODE EFFECT OF NOISE REDUCTION ON START-UP TIME CURRENT-LIMIT AND THERMAL OVERLOAD PROTECTION THERMAL CONSIDERATIONS TYPICAL APPLICATIONS CIRCUITS PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE