Very Low Quiescent Current,

150 mA, LDO Regulator

Data Sheet

ADP165/ADP166

FEATURES

Very low quiescent current

Maintains very low quiescent current in dropout (pass

through mode)

Stable with 1 µF ± 30% ceramic input and output capacitors

Input voltage range: 2.2 V to 5.5 V

Low shutdown current: 50 nA typical

Low dropout voltage: 120 mV at 150 mA load

Initial output voltage accuracy: ±1%

Accuracy over line, load, and temperature: ±3.5%

7 fixed output voltage options: 1.2 V to 3.3 V

Adjustable output option can be set from 1.0 V to 4.2 V

Current-limit and thermal overload protection

Logic control enable

Integrated output discharge resistor

Three package options

5-lead TSOT package

6-lead, 2 mm × 2 mm LFCSP

4-ball, 0.5 mm pitch WLCSP

APPLICATIONS

Portable and battery-powered equipment

Post dc-to-dc regulation

Portable medical devices

Wireless sensor network (WSN) devices

TYPICAL APPLICATION CIRCUITS

ADP165/ADP166

1

2

3

5

4

1µF

1µF

VOUT

NC

VIN

GND

EN

OFF

ON

NOTES

1. NC = NO CONNECT. NOT CONNECTED INTERNALLY.

Figure 1. 5-Lead TSOT ADP165/ADP166 with Fixed Output Voltage, 1.8 V

OFF

ON

4

EN

1µF

6

VIN

5

NC

3 GND

1

1µF

VOUT

2 NC

ADP165/

ADP166

NOTES

1. NC = NO CONNECT. NOT CONNECTED INTERNALLY.

Figure 2. 6-Lead, 2 mm × 2 mm LFCSP ADP165/ADP166 with Fixed Output

Voltage, 1.8 V

VIN

VOUT

1

2

EN

GND

1µF

1µF

TOP VIEW

(Not to Scale)

ADP165/ADP166

A

B

OFF

ON

Figure 3. 4-Ball WLCSP ADP165/ADP166 with Fixed Output Voltage, 1.8 V

GENERAL DESCRIPTION

The ADP165/ADP166 are very low quiescent current, low

dropout (LDO), linear regulators that operate from 2.2 V to 5.5 V

and provide up to 150 mA of output current. The low 120 mV

dropout voltage at a 150 mA load improves efficiency and allows

operation over a wide input voltage range.

The ADP165/ADP166 are specifically designed for stable operation

with a tiny 1 µF ± 30% ceramic input and output capacitors to

meet the requirements of high performance, space constrained

applications.

The ADP165/ADP166 are available in seven fixed output

voltage options, ranging from 1.2 V to 3.3 V, and an adjustable

output option. The ADP165 also includes a switched resistor to

discharge the output automatically when the LDO is disabled.

The ADP166 is identical to the ADP165, but it does not include

the output discharge function.

Short-circuit and thermal overload protection circuits prevent

damage in adverse conditions. The ADP165/ADP166 are

available in a tiny 5-lead TSOT, a 6-lead LFCSP, and a 4-ball,

0.5 mm pitch WLCSP package for the smallest footprint

solution to meet a variety of portable power applications.

Rev. A

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