Overview

The ADP2119/ADP2120 are low quiescent current, synchronous step-down DC-DC regulators housed in a compact 3 mm × 3 mm LFCSP_WD package. Both devices employ a current-mode, constant-frequency pulse-width modulation (PWM) control scheme, offering excellent stability and transient response. Under light-load conditions, these devices can be configured to operate in pulse-frequency modulation (PFM) mode, reducing the switching frequency to save power. The ADP2119/ADP2120 support an input voltage range of 2.3 V to 5.5 V. For the adjustable output version, the output voltage can be set from 0.6 V up to the input voltage (VIN). Fixed output versions provide preset output voltage options: 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V.

The ADP2119/ADP2120 integrate power switches, synchronous rectifiers, and internal compensation, providing a high-efficiency solution with very few external components. When disabled, the IC draws less than 2 μA from the input source. Additional key features include undervoltage lockout (UVLO), integrated soft start to limit inrush current during startup, overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown (TSD).

Features

Continuous output current:

– ADP2119: 2 A

– ADP2120: 1.25 A

145 mΩ and 70 mΩ integrated MOSFETs

Input voltage range: 2.3 V to 5.5 V

Output voltage range: 0.6 V to VIN

Output accuracy: ±1.5%

1.2 MHz fixed switching frequency

Synchronizable between 1 MHz and 2 MHz

Selectable PWM or PFM operating modes

Current-mode architecture

Precision threshold enable input

Power-good indicator

Voltage tracking

Integrated soft start

Internal compensation

Startup with precharged output

Undervoltage lockout (UVLO), overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown (TSD)

3 mm × 3 mm, 10‑lead LFCSP_WD package

Supported by ADIsimPower™ design tool

Applications

Point-of-load conversion

Communications and networking equipment

Industrial and instrumentation

Consumer electronics

Medical applications