GENERAL DESCRIPTION
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 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 500 mA load step.
The ADM7170 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 about 1.0 ms.
The ADM7170 regulator output noise is 5 μV rms independent of the
output voltage. The ADM7170 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 500 mA of output current in a small, low profile footprint.
FEATURES
Input voltage range: 2.3 V to 6.5 V
Maximum load current: 500 mA
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 500 mA load step
60 dB PSRR at 100 kHz
Low dropout voltage: 42 mV at 500 mA load, VOUT = 3 V
Initial accuracy: ±0.75%
Accuracy over line, load, and temperature: ±1.25%
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
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
