Datasheet ADM7172 (Analog Devices)

6.5 V, 2 A, Ultralow Noise, High PSRR, Fast Transient Response CMOS LDO Data Sheet ADM7172 FEATURES TYPICAL APPLICATION CIRCUIT Input voltage range: 2.3 V to 6.5 V ADM7172 Maximum load current: 2 A VIN = 5V VOUT = 3.3V VIN VOUT Low noise: 5 µV rms independent of output voltage at CIN C VIN VOUT OUT 4.7µF 4.7µF 100 Hz to 100 kHz SENSE ON Fast transient response: 1.5 μs for 1 mA to 1.5 A load step EN SS C 60 dB PSRR at 100 kHz SS OFF GND 1nF
001
Low dropout voltage: 172 mV at 2 A load, VOUT = 3 V
12250-
Initial accuracy: −0.5% (minimum), +1% (maximum)
Figure 1. ADM7172 with Fixed Output Voltage, 3.3 V
Accuracy over line, load, and temperature: ±1.5% Quiescent current, I
Inrush current can be controlled by adjusting the start-up time
GND = 0.7 mA with no load Low shutdown current: 0.25 μA at V
via the soft start pin. The typical start-up time with a 1 nF soft
IN = 5 V Stable with small 4.7 µF ceramic output capacitor
start capacitor is 1.0 ms.
Adjustable and fixed output voltage options: 1.2 V to 5.0 V
The ADM7172 regulator output noise is 5 μV rms, independent
Adjustable output from 1.2 V to VIN − VDO
of the output voltage. The ADM7172 is available in an 8-lead,
Precision enable
3 mm × 3 mm LFCSP, making it not only a very compact solution,
Adjustable soft start
but also providing excel ent thermal performance for applications
8-lead 3 mm × 3 mm LFCSP package
requiring up to 2 A of output current in a small, low profile
Supported by ADIsimPower™ tool
footprint.
APPLICATIONS T Regulation to noise sensitive applications: ADC and DAC circuits, precision amplifiers, PLLs/VCOs, and clocking ICs Communications and infrastructure 1 Medical and healthcare Industrial and instrumentation GENERAL DESCRIPTION 2
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 002
CH1 1.0A ΩB
architecture, the device provides high power supply rejection
W CH2 20mV BW M400ns A CH3 100mV T 0.0%
12250- and low noise, and achieves excellent line and load transient Figure 2. Transient Response (Trace 2), 1 mA to 1.5 A Load Step in 400 ns (Trace 1) response with just a smal 4.7 µF ceramic output capacitor. Load transient response is typical y 1.5 μs for a 1 mA to 1.5 A load step.
Table 1. Related Devices Device Input Voltage Output Current Package
The ADM7172 is available in 17 fixed output voltage options. ADM7170 2.3 V to 6.5 V 500 mA 8-lead LFCSP The following voltages are available from stock: 1.3 V, 1.8 V, ADM7171 2.3 V to 6.5 V 1 A 8-lead LFCSP 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 al ows output voltages that range from 1.2 V to VIN − VDO with an external feedback divider.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION 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 ADM7172 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