ADP1613 — Step-Up DC-DC Converter (20V Output, 2A Switch)

Overview

The ADP1613 (ADP1613ARMZ-R7) is a step-up (boost) DC-DC converter IC manufactured by Analog Devices. Packaged in a subminiature 8-lead MSOP enclosure, it integrates a 2.0A power switch to deliver output voltages up to $20\text{ Volts}$ from a single $2.5\text{V} \dots 5.5\text{V}$ DC supply or 5V USB power rail.

Operating at a selectable pin-programmable switching frequency of 650 kHz or 1.3 MHz, the ADP1613 allows tiny surface-mount inductors and ceramic capacitors. It is widely used in LCD bias supplies, sensor rail generation ( $12\text{V} / 15\text{V}$ from 3.3V/5V), and portable instrumentation.

Quick reference


Input Voltage (`VIN`)	2.5 V to 5.5 V DC
Output Voltage Range	Adjustable up to $20.0\text{ V}$ DC
Internal Power Switch	$2.0\text{ A}$ continuous switch current limit
Switching Frequency	Pin selectable $650\text{ kHz}$ (`FREQ` = GND) or $1.3\text{ MHz}$ (`FREQ` = VIN)
Feedback Reference Voltage	$1.235\text{ V}$ reference
Quiescent Current	$2.2\text{ mA}$ operating ( $< 1\ \mu\text{A}$ in shutdown)
Package	8-lead MSOP

Pinout (MSOP-8 Package)

text

             ┌───┴───┐
        COMP 1│ 1   8 │ VIN (+2.5V to +5.5V)
          FB 2│       │ 7 FREQ (Frequency Select)
          EN 3│ADP1613│ 6 NC
         GND 4│       │ 5 SW (Switch Output 20V)
             └───────┘

Pin	Name	Type	Description
1	`COMP`	Output	Error Amplifier Output (Connect RC compensation network to GND)
2	`FB`	Input	Feedback Voltage Sense Input ( $1.235\text{V}$ reference to GND)
3	`EN`	Input	Active-HIGH Enable Input (High = Enable; Low = Shutdown $< 1\mu\text{A}$ )
4	`GND`	Power	Ground Reference (0 V)
5	`SW`	Output	Internal 2.0A Power Switch Drain Output
6	`NC`	Unused	No Internal Connection
7	`FREQ`	Input	Frequency Select (GND = 650 kHz; VIN = 1.3 MHz)
8	`VIN`	Power	Power Supply Input (+2.5V to +5.5V DC)

Output Voltage Formula

$V_{OUT} = 1.235\text{V} \times \left(1 + \frac{R_1}{R_2}\right)$

Where $R_1$ is connected between $V_{OUT}$ and FB, and $R_2$ is connected between FB and GND.

Common mistakes

Leaving FREQ (Pin 7) floating: Pin 7 selects the switching frequency. Leaving FREQ floating causes switching frequency instability. Tie to GND for 650 kHz or to VIN for 1.3 MHz.
Operating without low-ESR ceramic input/output capacitors: Use $10\ \mu\text{F} \dots 22\ \mu\text{F}$ X5R or X7R ceramic capacitors directly at the VIN and VOUT pins.

Notes

ADP1613 vs ADP1612: ADP1613 has a 2.0A switch; ADP1612 is a lower-current 1.4A switch version in the same MSOP-8 footprint.