ADP121 150 mA, Low Quiescent Current, CMOS Linear Regulator in 5-Lead TSOT or 4-Ball WLCSP

The ADP121 is a quiescent current, low dropout, linear regulator that operates from 2.3 V to 5.5 V and provides up to 150 mA of output current. The low 135 mV dropout voltage at 150 mA load improves efficiency and allows operation over a wide input voltage range. The low 30 μA of quiescent current at full load makes the ADP121 ideal for battery-operated portable equipment. The ADP121 is available in output voltages ranging from 1.2 V to 3.3 V. The parts are optimized for stable operation with small 1 μF ceramic output capacitors. The ADP121 delivers good transient performance with minimal board area. Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP121 is available in a tiny 5-lead TSOT and 4-ball 0.4 mm pitch WLCSP pack-ages and utilizes the smallest footprint solution to meet a variety of portable applications.

The ADP121 is available in output voltages ranging from 1.2 V to 3.3 V. The parts are optimized for stable operation with small 1 μF ceramic output capacitors. The ADP121 delivers good transient performance with minimal board area.

Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP121 is available in a tiny 5-lead TSOT and 4-ball 0.4 mm pitch WLCSP pack-ages and utilizes the smallest footprint solution to meet a variety of portable applications.

Features and Benefits

Input voltage range: 2.3 V to 5.5 V
Output voltage range: 1.2 V to 3.3 V
Output current: 150 mA
Low quiescent current
I_GND = 11 μA with 0 μA load
I_GND = 30 μA with 150 mA load
Low shutdown current: <1 μA

Low dropout voltage
90 mV @ 150 mA load
High PSRR
70 dB @ 1 kHz at V_OUT = 1.2 V
70 dB @ 10 kHz at V_OUT = 1.2 V
Low noise: 40 μV rms at VOUT = 1.2 V
See data sheet for additional features

Power Management

Linear Regulators

Building Technology

Building Control and Automation
LED General Lighting
White Goods and Vending

Design Tools

ADI Linear Regulator Design Tool and Parametric Search .

Reference Designs

Data Sheets

Document	note
ADP121: 150 mA, Low Quiescent Current, CMOS Linear Regulator Data Sheet (Rev. G)	PDF 979 kB

Application Notes

Document	note
AN-1072: How to Successfully Apply Low Dropout Regulators	PDF 105 kB

User Guides

Document	note
UG-052: RedyKit for the ADP121 LDO	PDF 118 kB

Frequently Asked Questions

Document	note

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 1000+	RoHS
ADP121-ACBZ12R7 Production	4 ball WLCSP (.82x.82mm)	REEL 3000	-40 to 125C	0.31	Y
ADP121-ACBZ15R7 Production	4 ball WLCSP (.82x.82mm)	REEL 3000	-40 to 125C	0.31	Y
ADP121-ACBZ165R7 Production	4 ball WLCSP (.82x.82mm)	REEL 3000	-40 to 125C	0.31	Y
ADP121-ACBZ188R7 Last Time Buy	4 ball WLCSP (.82x.82mm)	REEL 3000	-40 to 125C	0.31	Y
ADP121-ACBZ18R7 Production	4 ball WLCSP (.82x.82mm)	REEL 3000	-40 to 125C	0.31	Y
ADP121-ACBZ20R7 Production	4 ball WLCSP (.82x.82mm)	REEL 3000	-40 to 125C	0.31	Y
ADP121-ACBZ25R7 Production	4 ball WLCSP (.82x.82mm)	REEL 3000	-40 to 125C	0.31	Y
ADP121-ACBZ28R7 Production	4 ball WLCSP (.82x.82mm)	REEL 3000	-40 to 125C	0.31	Y
ADP121-ACBZ30R7 Production	4 ball WLCSP (.82x.82mm)	REEL 3000	-40 to 125C	0.31	Y
ADP121-ACBZ33R7 Production	4 ball WLCSP (.82x.82mm)	REEL 3000	-40 to 125C	0.31	Y
ADP121-AUJZ12R7 Production	5 ld TSOT	REEL 3000	-40 to 125C	0.27	Y
ADP121-AUJZ15R7 Production	5 ld TSOT	REEL 3000	-40 to 125C	0.27	Y
ADP121-AUJZ18R7 Production	5 ld TSOT	REEL 3000	-40 to 125C	0.27	Y
ADP121-AUJZ20R7 Last Time Buy	5 ld TSOT	REEL 3000	-40 to 125C	0.27	Y
ADP121-AUJZ25R7 Production	5 ld TSOT	REEL 3000	-40 to 125C	0.27	Y
ADP121-AUJZ28R7 Production	5 ld TSOT	REEL 3000	-40 to 125C	0.27	Y
ADP121-AUJZ30R7 Production	5 ld TSOT	REEL 3000	-40 to 125C	0.27	Y
ADP121-AUJZ33R7 Production	5 ld TSOT	REEL 3000	-40 to 125C	0.27	Y

Evaluation Boards

Part Number	Description	Price	RoHS
ADP121CB-1.2-EVALZ	Evaluation Board	60	Y
ADP121CB-1.5-EVALZ	Evaluation Board	60	Y
ADP121CB-1.8-EVALZ	Evaluation Board	60	Y
ADP121CB-2.0-EVALZ	Evaluation Board	60	Y
ADP121CB-2.5-EVALZ	Evaluation Board	60	Y
ADP121CB-2.8-EVALZ	Evaluation Board	60	Y
ADP121CB-3.0-EVALZ	Evaluation Board	60	Y
ADP121CB-3.3-EVALZ	Evaluation Board	60	Y
ADP121UJZ-REDYKIT	Evaluation Board	45	Y
ADZS-SC584-EZBRD	Evaluation Board	435	Y
ADZS-SC584-EZLITE	EZ-BRD with ICE-1000 and 2x 180 Day CCES License	495	Y
ADZS-SC589-EZBRD	Evaluation Board	435	Y
ADZS-SC589-EZLITE	EZ-BRD with ICE-1000 and 2x 180 Day CCES License	495	Y