ADP2311

PRODUCTION

Dual 1 A, 18 V, Synchronous Step-Down Regulator with Fail-Safe Voltage Monitoring

Data Sheet (Rev. B) Product Selection Table

Part Models: 4
1ku List Price: Starting From $2.55

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Overview

Input voltage: 4.5 V to 18 V
±1.0% output accuracy
Integrated MOSFET: 110 mΩ/60 mΩ typical
Continuous output current: 1 A/1 A
Power fail comparator generates warning
Power-on reset with programmable delay timer
Adjustable voltage monitor for power-down (Channel 2)
Watchdog refresh input

Dual phase with 180° out-of-phase operation
Fixed switching frequency: 300 kHz
Internal compensation and soft start
Stable with low ESR output ceramic capacitors
Precision enable input
Power feedback during power-off
UVLO, OCP, OVP, and thermal shutdown protection

The ADP2311 is a fully integrated, dual output, synchronous step-down dc-to-dc regulator. The regulator operates from input voltages of 4.5 V to 18 V, and the output can regulate down to 0.6 V. Each channel can provide up to 1 A of continuous output current.

The ADP2311 integrates the high-side and low-side MOSFETs to provide a very high efficiency, compact solution. Both channels of the regulator run at 180° out of phase to reduce the input ripple current and the input capacitor size, thereby helping to lower system electromagnetic interference (EMI). The ADP2311 also integrates internal compensation and soft start circuitry to simplify the design.

An on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. Accurate voltage monitoring circuitry and a power fail comparator provide a controlled power-up and power-down sequence to enhance system reliability.

The ADP2311 also includes undervoltage lockout (UVLO), overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown (TSD).

The ADP2311 operates over the −40°C to +125°C junction temperature range and is available in a 24-lead LFCSP package.

Applications

Industrial and instrumentation
Healthcare and medical
DC-to-DC point of load applications

Part Models: 4
1ku List Price: Starting From $2.55

Documentation

Data Sheet 1

ADP2311: Dual 1 A, 18 V, Synchronous Step-Down Regulator with Fail-Safe Voltage Monitoring Data Sheet (Rev.B) 03/28/2014

User Guide 1

UG-653: Evaluation Board for the ADP2311, Dual, 1 A, 18 V Synchronous Step-Down Regulator with Fail-Safe Voltage Monitoring 04/03/2014

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
ADP2311ACPZ-1-R7	24-Lead LFCSP (4mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADP2311ACPZ-2-R7	24-Lead LFCSP (4mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADP2311ACPZ-3-R7	24-Lead LFCSP (4mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADP2311ACPZ-4-R7	24-Lead LFCSP (4mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 25, 2025 - 25_0054 Gold wire to Copper wire Conversion (Notification)
		PCN25_0054_Form Material_Report Qualification Results Summary Qualification Results Summary Qualification Results Summary Qualification Results Summary
ADP2311ACPZ-1-R7	PRODUCTION
ADP2311ACPZ-4-R7	PRODUCTION
Feb 6, 2017 - 16_0234 Assembly Transfer to ASE Korea and Test Transfer to STATS ChipPAC Singapore of Select LFCSP Parts.
		PCN16_0234_Form Material_Report Detailed Change Description Detailed Change Description Qualification Results Summary Test Correlation Report
ADP2311ACPZ-1-R7	PRODUCTION
ADP2311ACPZ-2-R7	PRODUCTION
ADP2311ACPZ-3-R7	PRODUCTION
ADP2311ACPZ-4-R7	PRODUCTION
May 29, 2014 - 14_0136 Assembly and Test Transfer of Select 4x4 and 5x5 mm LFCSP Products to STATS ChipPAC China
		PCN14_0136_Form Material_Report Detailed Change Description Qualification Results Summary Test Correlation Report
ADP2311ACPZ-1-R7	PRODUCTION
ADP2311ACPZ-2-R7	PRODUCTION
ADP2311ACPZ-3-R7	PRODUCTION
ADP2311ACPZ-4-R7	PRODUCTION
Nov 12, 2013 - 13_0230 Assembly and Test Transfer of Select 3.5x3.5, 4x3, 4x4, and 5x5mm LFCSP Products to STATS ChipPAC China
		PCN13_0230_Form Material_Report Detailed Change Description Qualification Plan Summary Test Correlation Plan
ADP2311ACPZ-1-R7	PRODUCTION
ADP2311ACPZ-2-R7	PRODUCTION
ADP2311ACPZ-3-R7	PRODUCTION
ADP2311ACPZ-4-R7	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

ADP2311

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

ADP2311 Evaluation Board

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Product Details

The ADP2311 evaluation board is a complete, dual, 1 A step-down regulator solution that allows users to evaluate the performance of the ADP2311 with a near ideal printed circuit board (PCB) layout.

The outputs of the ADP2311 evaluation board are preset to 1.2 V and 3.3 V for Channel 1 and Channel 2, respectively. The V_IN threshold of the power fail input is set at 8.99 V. Different output and power fail input voltages can be achieved by changing the appropriate passive components.

Features

Input voltage: 4.5 V to 18 V
±1.0% output accuracy
Integrated MOSFET: 110 mΩ/60 mΩ typical
Continuous output current: 1 A/1 A
Power fail comparator generates warning
Power-on reset with programmable delay timer
Adjustable voltage monitor for power-down
Watchdog refresh input Dual phase with 180° out of phase operation
Fixed switching frequency: 300 kHz
Internal compensation and soft start Stable with low effective series resistance (ESR) output ceramic capacitors
Precision enable input Power feedback during power off
Undervoltage lockout (UVLO), overcurrent protection (OCP), overvoltage protection (OVP), and thermal shutdown (TSD)

Resources

UG-653: Evaluation Board for the ADP2311, Dual, 1 A, 18 V Synchronous Step-Down Regulator with Fail-Safe Voltage Monitoring
4/3/2014

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