AD8452

RECOMMENDED FOR NEW DESIGNS

Precision Integrated Analog Front End, Controller, and PWM for Battery Test and Formation Systems

Data Sheet (Rev. A) Product Selection Table

Part Models: 2
1ku List Price: Starting From $6.89

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Overview

CC and CV battery test and formation modes with transparent and automatic switchover, for systems of 20 Ah or less
Precise measurement of voltage and current
Independent feedback control blocks
Highly accurate, factory trimmed instrumentation and differential amplifiers
- In-amp for current sense gain: 66 V/V
- Difference amplifier for voltage sense gain: 0.4V/V
Stable over temperature: offset voltage drift <0.6 µV/°C (maximum)

Gain drift: <3 ppm/°C (maximum)
Current sense CMRR: 120 dB minimum
Popular SMPS control for charge/discharge
High PWM linearity with internal ramp voltage
50 kHz to 300 kHz user controlled switching frequency
Synchronization output or input with adjustable phase shift
Programmable soft start

The AD8452 combines a precision analog front-end controller and switch mode power supply (SMPS), pulse-width modulator (PWM) driver into a single silicon platform for high volume battery testing and formation manufacturing. A precision instrumentation amplifier (in-amp) measures the battery charge/discharge current, while an equally accurate difference amplifier measures the battery voltage. Internal laser trimmed resistor networks establish the in-amp and difference amplifier gains (66 V/V and 0.4 V/V, respectively), and stabilize the AD8452 performance across the rated operating temperature range.

Desired battery cycling current and voltage levels are established by applying precise control voltages to the ISET and VSET inputs. Actual charge and discharge current levels are sensed (usually by a high power, highly accurate shunt resistor) whose value is carefully selected according to system parameters. Switching between constant current (CC) and constant voltage (CV) loop integration is instantaneous, automatic, and completely transparent to the observer. A logic high at the MODE input selects the charge or discharge mode (high for charge, low for discharge).

The AD8452 simplifies designs by providing excellent performance, functionality, and overall reliability in a space saving 48-lead, 7 mm × 7 mm × 1.4 mm LQFP package rated for operation at temperatures from −40°C to +85°C.

Applications

Battery formation and testing
High efficiency battery test systems with recycle capability
Battery conditioning (charging and discharging) systems

Part Models: 2
1ku List Price: Starting From $6.89

Documentation

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
AD8452ASTZ	48-Lead LQFP (7mm x 7mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD8452ASTZ-RL	48-Lead LQFP (7mm x 7mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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

Software Resources

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Tools & Simulations

LTspice 1

AD8452 Demo Circuit - Charging Mode (4.2V 10A)

Models for the following parts are available in LTspice:

AD8452

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

AD8452 Evaluation Board

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Features and Benefits

Pin accessible, standalone AD8452
Simplified operation: connect a power supply and scope and start looking at waveforms
On-board precision 5 V reference included for accurate gain measurements
Factory tested
Four optional control loops available but not necessary for operation; may be bypassed as desired
Safe: only low power circuitry is present; no accidental power discharges

Product Details

The AD8452-EVALZ is a platform for the AD8452, designed for investigation of the AD8452 analog and pulse-width modulation (PWM) features and performance without the added complications of a driver and/or switch mode power supply (SMPS) design. For convenience, a precision 5 V reference IC and four trim pots are built in to the evaluation board, for driving the battery current and voltage ISET and VSET inputs. All device pins are accessible with test loops or probe landings.

At the same time, the AD8452-EVALZ has the flexibility to interface and drive a typical half bridge inductor input SMPS with output levels in the 1 A to 15 A range. SMPS and associated components are specified and sourced by the user.

The AD8452 is intended for use as the core controller for commercial battery test and formation systems. Its advanced miniaturization and extraordinarily high level of analog precision meet the challenge of mass production of high energy density storage lithium ion packs for transportation and energy storage in homes.

When working with the evaluation board, consult the AD8452 data sheet for a detailed device Theory of Operation and for additional information in conjunction with user guide UG-1180.

Resources

UG-1181: AD8452 System Demo Evaluation Board (Rev.0)
11/2/2017

UG-1180: Universal Evaluation Board for the AD8452 (Rev.0)
11/2/2017

AD8452 Demo System 12V Power Module
3/12/2021

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AD8452

Overview

Documentation

Data Sheet 1

User Guide 2

Technical Articles 1

Video 1

Thought Leadership Page 1