MAX17435

High-Frequency, Low-Cost SMBus Battery Chargers

Low-Cost SMBus Chargers Deliver Up to 7A Charge Current

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Overview

Features and Benefits
Product Details

Features and Benefits

Low-Cost SMBus Charger
High Switching Frequency (0.85MHz, 0.5MHz)
Internal Boost Switches
SMBus-Programmable Charge Voltage, Input Current Limit, Charge Current, Relearn Voltage, and Digital IINP Readback
Single-Point Compensation
Automatic Selection of System Power Source
- Adapter n-channel MOSFETs Driven by an Internal Dedicated Charge Pump
- Adapter Soft-Start
±0.4% Accurate Charge Voltage
±2.5% Accurate Input Current Limiting
±3% Accurate Charge Current
Monitor Outputs for
- AC Adapter Current (±2% Accuracy)
- Battery Discharge Current (±2% Accuracy)
- AC Adapter Presence
AC Adapter Overvoltage Protection
11-Bit Battery Voltage Setting
6-Bit, Charge-Current Setting/Input Current Setting
Improved IINP Accuracy at Low Input Current

Product Details

The MAX17435/MAX17535 integrated multichemistry battery chargers IC simplify construction of accurate and efficient chargers. The MAX17435/MAX17535 provide SMBus™-programmable charge current, charge voltage, input current limit, relearn voltage, and digital readback of the IINP voltage. The MAX17435/MAX17535 utilize a charge pump to control the adapter selection n-channel MOSFETs when the adapter is present. When the adapter is absent, the charge pump is shut down and a p-channel MOSFET selects the battery.

The MAX17435/MAX17535 provide up to 7A of charge current to 2, 3, or 4 lithium-ion (Li+) cells in series. The charge current, and input current-limit sense amplifiers have low offset errors and can use 10mΩ sense resistors. The MAX17435/MAX17535 fixed-inductor ripple architecture significantly reduces component size and circuit cost.

The MAX17435/MAX17535 provide a digital output that indicates the presence of the adapter, an analog output that indicates the adapter or battery current, depending upon the presence or absence of the adapter, and a digital output that indicates when the adapter current exceeds a user-defined threshold.

The MAX17435 switches at 850kHz, and the MAX17535 switches at 500kHz.

The MAX17435/MAX17535 are available in a small, 4mm x 4mm x 0.75mm 24-pin, lead-free QFN package. An evaluation kit is available.

Applications

2- to 4-Li+ Cell Battery-Powered Devices
Notebook Computers
PDAs and Mobile Communicators

Product Categories

Power Management
- Switching Battery Chargers
- SMBUS/I2C/SPI Controlled Battery Chargers

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Product Lifecycle Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

MAX17435EVKIT

Evaluation Kit for the MAX17435

MAX17535EVKIT

Evaluation Kit for the MAX17535

MAX17435EVKIT

View Detailed Evaluation Kit Information

The MAX17435 evaluation kit (EV kit) is an assembled and tested PCB that evaluates the MAX17435 IC. The MAX17435 is a multichemistry battery charger controller with SMBus™ programmable charge current, charge voltage, input-current limit, relearn voltage, and digital readback of the IINP voltage. The EV kit is capable of supplying power to a system load while simultaneously charging multichemistry battery packs. During operation, the EV kit circuit automatically selects the AC adapter input or the battery as the main power source for supplying power to the system load. Whenever the EV kit current limit is exceeded, the battery-charge current is reduced automatically to give priority to the system load.

The EV kit's input-current limit, battery-charge voltage, and maximum battery-charge current can be programmed through the SMBus-compatible serial interface, communicating at data rates up to 100kbps. The SMBus data is sent through an on-board USB interface circuit using a PC or a user-supplied SMBus controller.

The EV kit also features Windows® 2000-, Windows XP®-, and Windows Vista®-compatible software that provides a user interface for exercising the MAX17435's features. The program is menu driven and offers a graphical user interface (GUI) complete with buttons and checkboxes.

Applications

2- to 4-Li+ Cell Battery-Powered Devices
Notebook Computers
PDAs and Mobile Communicators

Features & Benefits

8V to 24V Input Operation
Software Controlled
- Input Source Current Up to 11A
- Charge Current Up to 7A
- Charge Voltage Up to 19.2V
- Relearn Voltage Up to 19.2V
- IINP Voltage Readback
Monitor Outputs for
- AC Adapter Current/Battery Discharge Current
- AC Adapter Presence
5.4V Linear Regulator Output
Automatic Power-Source Selection
Proven PCB Layout
On-Board USB Interface Circuit Generates SMBus-Compatible Signals
USB-PC Connection (Cable Included)
PCB Pads for User-Supplied SMBus-Compatible Signals
Evaluates the MAX17435ETG+ in 24-Pin TQFN Package with Exposed Pad
Windows 2000-, Windows XP-, and Windows Vista (32-Bit)-Compatible Software
Fully Assembled and Tested

MAX17535EVKIT

View Detailed Evaluation Kit Information

The MAX17535 evaluation kit (EV kit) is an assembled and tested PCB that evaluates the MAX17535 IC. The IC is a multichemistry battery charger controller with SMBus™-programmable charge current, charge voltage, input-current limit, relearn voltage, and digital readback of the IINP voltage. The EV kit is capable of supplying power to a system load while simultaneously charging multichemistry battery packs. During operation, the EV kit circuit automatically selects the AC adapter input or the battery as the main power source for supplying power to the system load. Whenever the EV kit current limit is exceeded, the battery-charge current is reduced automatically to give priority to the system load.

The EV kit also features Windows® 2000-, Windows XP®-, and Windows Vista®-compatible software that provides a user interface for exercising the IC's features. The program is menu driven and offers a graphical user interface (GUI) complete with buttons and checkboxes.

Applications

2- to 4-Li+ Cell Battery-Powered Devices
Notebook Computers
PDAs and Mobile Communicators

Features & Benefits

8V to 24V Input Operation
Software Controlled
- Input Source Current Up to 11A
- Charge Current Up to 7A
- Charge Voltage Up to 19.2V
- Relearn Voltage Up to 19.2V
- IINP Voltage Readback
Monitor Outputs for
- AC Adapter Current/Battery Discharge Current
- AC Adapter Presence
5.4V Linear Regulator Output
Automatic Power-Source Selection
Proven PCB Layout
On-Board USB Interface Circuit Generates SMBus-Compatible Signals
USB-PC Connection (Cable Included)
PCB Pads for User-Supplied SMBus-Compatible Signals
Evaluates the MAX17535ETG+ in 24-Pin TQFN Package with Exposed Pad
Windows 2000-, Windows XP-, and Windows Vista (32-Bit)-Compatible Software
Fully Assembled and Tested

Documentation & Resources

Data Sheet

MAX17435-MAX17535: High-Frequency, Low-Cost SMBus Battery Chargers Data Sheet (Rev. 1)
10/26/2010
PDF

Tools & Simulations

Software Development

MAX17435 EVKIT Software, 1.0.0

ZIP

Product Recommendations

MAX17435 Companion Parts

Recommended Related Parts

MAX8731A.

Design Resources

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 Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
MAX17435ETG+	Material Declaration	Reliability Data	24-LFCSP-4X4X0.75	Ultra Librarian SamacSys
MAX17435ETG+T	Material Declaration	Reliability Data	24-LFCSP-4X4X0.75	Ultra Librarian SamacSys
Wafer Fabrication Data

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Evaluation Boards

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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.