ADP170 데이터 시트보기 (PDF) - Analog Devices

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ADP170

300 mA, Low Quiescent Current, CMOS Linear Regulators

Analog Devices 

300 mA, Low Quiescent Current,

CMOS Linear Regulators

ADP170/ADP171

FEATURES

Maximum output current: 300 mA

Input voltage range: 1.6 V to 3.6 V

Low quiescent current

IGND = 23 μA with 0 mA load

IGND = 170 μA with 300 mA load

Low shutdown current: <1 μA

Low dropout voltage: 66 mV at 300 mA load

Output voltage accuracy: ±1%

Up to 31 fixed-output voltage options available from 0.8 V to

3.0 V

Adjustable-output voltage range

0.8 V to 3.0 V (ADP171)

Accuracy over line, load, and temperature: ±3%

Stable with small 1 μF ceramic output capacitor

PSRR performance of 70 dB at 10 kHz and 73 dB at 1 kHz

Low noise: 30 μV rms at VOUT = 0.8 V

Current limit and thermal overload protection

Logic-controlled enable

Compact 5-lead TSOT package

APPLICATIONS

Mobile phones

Digital camera and audio devices

Portable and battery-powered equipment

DSP/FPGA/microprocessor supplies

Post dc-dc regulation

GENERAL DESCRIPTION

The ADP170/ADP171 are low voltage input, low quiescent

current, low-dropout (LDO) linear regulators that operate from

1.6 V to 3.6 V and provide up to 300 mA of output current. The

low 66 mV dropout voltage at 300 mA load improves efficiency

and allows operation over a wide input voltage range. The low

23 μA of quiescent current at a 0 mA load makes the ADP170/

ADP171 ideal for battery-operated portable equipment.

The ADP170 is capable of 31 fixed-output voltage options, ranging

from 0.8 V to 3.0 V. ADP171 is an adjustable version, which allows

output voltages that range from 0.8 V to 3.0 V via an external

divider. The ADP170/ADP171 are optimized for stable operation

with small 1 μF ceramic output capacitors. Ideal for powering

digital processors, the ADP170/ADP171 exhibit good transient

TYPICAL APPLICATION CIRCUITS

VIN

C1

ON

OFF

1 VIN VOUT 5

ADP170

C2

2 GND

VOUT

3 EN

NC 4

Figure 1. ADP170 with Fixed Output Voltage, 1.8 V

VIN = 2.3V

CIN

1µF

ON

OFF

1 VIN VOUT 5

ADP171

2 GND

3 EN

ADJ 4

VOUT = 1.8V

COUT

1µF

R1

R2

Figure 2. ADP171 with Adjustable Output Voltage

performance and occupy minimal board space. Compared with

commodity types of LDOs, the ADP170/ADP171 provide 20 dB

to 40 dB better power supply rejection ratio (PSRR) at 100 kHz,

making the ADP170/ADP171 an ideal power source for analog-

to-digital converter (ADC) mixed-signal processor systems and

allowing use of smaller size bypass capacitors. In addition, low

output noise performance without the need for an additional

bypass capacitor further reduces printed circuit board (PCB)

component count.

Short-circuit protection and thermal overload protection circuits

prevent damage in adverse conditions. The ADP170/ADP171

are available in tiny 5-lead TSOT for the smallest footprint

solution to meet a variety of portable power applications.

Rev. B

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

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

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