MAX8845X

28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage-Protected Output

Industry's First 30V-Rated, Single-Input, 1-Cell Li+ Battery Chargers with Overvoltage-Protected Output

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Product Lifecycle Obsolete

The models in this product family are no longer available.

Replacement Parts

To find replacement products for this part:

Rochester Electronics and Arrow Supply Assurance have partnered with Analog Devices to source products that have been previously discontinued or have become obsolete.

Evaluation Kits (1)

MAX8845ZEVKIT

Evaluation Kit for the MAX8845Z and MAX8845Y

MAX8845ZEVKIT

View Detailed Evaluation Kit Information

The MAX8845Z evaluation kit (EV kit) is a fully assembled and tested PCB for evaluating the MAX8845Z/MAX8845Y 28V linear Li+ battery chargers.

The MAX8845Z EV kit features an overvoltage-protected LDO output (SAFEOUT) for low-voltage-rated USB or charger inputs in the system, and a battery pack detection circuit (DETBAT) that disables the IC when the battery pack is absent. The IC disables charging if the input sources exceed 7.5V to protect against unqualified or faulty AC adapters. The MAX8845Z EV kit also features an adjustable fast-charge current set by an external resistor (R1) and an adjustable top-off current threshold set by an external resistor (R2).

Other features include an active-low control input (EN) and an active-low input power source detection output (POK). The IC also contains a booting assistant circuit that distinguishes input sources and battery connection, and provides an output signal (MAX8845Z = ABO, MAX8845Y = active-low ABO) for system booting.

To evaluate the MAX8845Y version, order the MAX8845YETC+ along with the MAX8845ZEVKIT+ and see the Evaluating the MAX8845Y section.

Applications

Bluetooth® Equipment
Cellular and Cordless Phones
Charging Cradles and Docks
Digital Still Cameras
MP3 Players
Smart Phones and PDAs
USB Appliances

Features & Benefits

CCCV, Thermally Regulated Linear Single-Cell Li+ Battery Charger
No External MOSFET, Reverse-Blocking Diode, or Current-Sense Resistor
Programmable Fast-Charge Currents (1A_RMS max)
Programmable Top-Off Current Threshold
Input Overvoltage-Protected 4.7V Output (SAFEOUT) from DC
Proprietary Die Temperature Regulation Control (+115°C)
4.25V to 28V Input-Voltage Range with Input Overvoltage Protection Above +7.5V
Low-Dropout Voltage (300mV at 500mA)
Input Power-Source Detection Output (Active-Low POK), Charge Status Output (Active-Low CHG), and Charge-Enable Input (Active-Low EN)
Output for Autobooting (MAX8845Z = ABO, MAX8845Y = Active-Low ABO)
Lead(Pb)-Free and RoHS Compliant

Documentation & Resources

Data Sheets

MAX8845W-MAX8845Z: 28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage-Protected Output Data Sheet (Rev. 1)
11/24/2009

PDF

490K

Reliability Data

MAX8845X Reliability Data
1/12/2023

PDF

34K

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.