ADP2120 1.25A, 1.2MHz Synchronous Step-Down DC-to-DC Regulator

The ADP2119/ADP2120 are low quiescent current, synchronous, step-down DC-to -DC regulators in a compact 3mm x3mm LFCSP_WD package. Both Devices use current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. Under light load condition, they can be configured to operate in pulse frequency modulation (PFM) mode that reduces switching frequency to save power.

The ADP2119/ADP2120 can support input voltages from 2.3V to 5.5V. The output voltage can be adjusted from 0.6V to input voltage (VIN) for the adjustable version, while the fixed output version is available in preset output voltage options of 3.3V, 2.5V, 1.8V, 1.5V ,1.2V and 1.0V. The ADP2119/ADP2120 require minimal external parts and provide a high efficiency solution with their integrated power switches, synchronous rectifier, and internal compensation. Each IC draws less than 3 μA current from the input source when it is disabled. Other key features include under voltage lockout(UVLO), integrated soft start to limit inrush current at startup, overvoltage protection (OVP), over current protection (OCP) and thermal shutdown (TSD).

Applications

Point of load conversion
Communications and networking equipments
Industrial and instrumentation
Consumer electronics
Medical appliances

Features and Benefits

Continuous output current: 1.25A
145 mΩ and 70 mΩ integrated FET
Input voltage range from 2.3V to 5.5 V
Output voltage from 0.6V to VIN
±1.5% output accuracy
1.2MHz fixed switching frequency
Synchronizable between 1.0MHz and 2MHz
Selectable PWM or PFM mode operation

Current mode architecture
Precision threshold enable input
Power-good flag
Voltage tracking input
Integrated soft start
Internal compensation
Start up with precharged output
See data sheet for additional features

Power Management

Switching Regulators

Design Tools

ADP21xx Buck Regulator Design Tool .

Data Sheets

Document	note
ADP2119/ADP2120: 2 A/1.25 A, 1.2 MHz, Synchronous,Step-Down DC-to-DC Regulators (Rev. A)	PDF 1119 kB

Application Notes

Document	note
AN-1368: Ferrite Bead Demystified (Rev. 0)	PDF 443.22 K

User Guides

Document	note
UG-188: Evaluation Board User Guide for ADP2119/ADP2120 Step-Down Regulator	PDF 430 kB

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 1000+	RoHS
ADP2120ACPZ-1.0-R7 Production	10 ld LFCSP (3x3mm)	REEL 1500	-40 to 125C	0.94	Y
ADP2120ACPZ-1.2-R7 Production	10 ld LFCSP (3x3mm)	REEL 1500	-40 to 125C	0.94	Y
ADP2120ACPZ-1.5-R7 Production	10 ld LFCSP (3x3mm)	REEL 1500	-40 to 125C	0.94	Y
ADP2120ACPZ-1.8-R7 Production	10 ld LFCSP (3x3mm)	REEL 1500	-40 to 125C	0.94	Y
ADP2120ACPZ-2.5-R7 Production	10 ld LFCSP (3x3mm)	REEL 1500	-40 to 125C	0.94	Y
ADP2120ACPZ-3.3-R7 Production	10 ld LFCSP (3x3mm)	REEL 1500	-40 to 125C	0.94	Y
ADP2120ACPZ-R7 Production	10 ld LFCSP (3x3mm)	REEL 1500	-40 to 125C	0.94	Y