Datasheet ADM7170 (Analog Devices)

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 Maximum load current: 500 mA ADM7170 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 Fast transient response: 1.5 μs for 1 mA to 500 mA load step ON EN SS 60 dB PSRR at 100 kHz CSS OFF GND 1nF Low dropout voltage: 42 mV at 500 mA load, V
001
OUT = 3 V Initial accuracy: ±0.75%
12297-
Accuracy over line, load, and temperature: ±1.25%
Figure 1. ADM7170 with Fixed Output Voltage, 3.3 V
Quiescent current, IGND = 0.7 mA at 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
Inrush current can be controlled by adjusting the start-up time
Adjustable output from 1.2 V to V
via the soft start pin. The typical start-up time with a 1 nF soft
IN − VDO Precision enable
start capacitor is about 1.0 ms.
Adjustable soft start
The ADM7170 regulator output noise is 5 μV 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 t ool
3 mm × 3 mm LFCSP, making it not only a very compact
APPLICATIONS
solution, but also providing excellent thermal performance for 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 Communications and infrastructure T 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 smal 4.7 µF ceramic output 002
CH1 200mA ΩBW CH2 10mV BW M400ns A CH3 100mV
capacitor. Load transient response is typically 1.5 μs for a 1 mA
T 0.4%
12297- to 500 mA load step. Figure 2. Transient Response (Trace 2), 1 mA to 500 mA Load Step in 400 ns (Trace 1) The ADM7170 is available in 17 fixed output voltage options. The following voltages are available from stock: 1.3 V, 1.8 V,
Table 1. Related Devices
2.5 V, 3.0 V, 3.3 V, 4.2 V, and 5.0 V. Additional voltages that are
Device Input Voltage Output Current Package
available by special order are: 1.5 V, 1.85 V, 2.0 V, 2.2 V, 2.7 V, ADM7171 2.3 V to 6.5 V 1 A 8-lead LFCSP 2.75 V, 2.8 V, 2.85 V, 3.8 V, and 4.6 V. An adjustable version is ADM7172 2.3 V to 6.5 V 2 A 8-lead LFCSP also available that allows 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 TYPICAL APPLICATION CIRCUIT 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 ADM7170 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