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Features
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The MAX8568A/MAX8568B backup-battery-management ICs are complete charging and backup switchover control solutions for PDAs, Smart Phones, and other smart portable devices. They charge both NiMH and rechargeable lithium battery types and feature programmable charge current and termination voltage. Separate optimized charge algorithms for both lithium and NiMH cells are included on-chip.
The MAX8568A/MAX8568B also manage backup switchover from a primary power source. An accurate onchip voltage detector monitors the main supply and backs up two system supplies (typically I/O and memory) when main power falls. On-chip drivers switch external MOSFETs to disconnect the main supply from the system loads so the backup source is not drained.
Low-voltage backup cells can be stepped up by an onchip synchronous-rectified, low-quiescent-current boost converter. Additionally, a low-quiescent-current LDO generates a second backup voltage. The MAX8568A LDO is preset to 2.5V while the MAX8568B LDO is preset to 1.8V. Both devices are supplied in 16-pin 3mm x 3mm thin QFN packages rated for -40°C to +85°C operation.
Applications
- DSCs and DVCs
- Internet Appliances and Web-Books
- Palmtops and Wireless Handhelds
- PDAs and PDA Phones
- Smartphones
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MAX8568A
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Data Sheet
3
MAX8568A-MAX8568B: Complete Backup-Management ICs for Lithium and NiMH Batteries Data Sheet (Rev.1)
Documentation
Software & Part Ecosystem
Evaluation Kits 1
MAX8568AEVKIT
Evaluation for the MAX8568A
Features and Benefits
3.3V, 50mA Step-Up DC-DC Converter
2.5V, 10mA LDO
Product Detail
The MAX8568A evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX8568A and MAX8568B complete backup-management ICs for lithium and NiMH batteries. The MAX8568A EV kit can charge both NiMH and rechargeable lithium battery types; the EV kit default setting is for NiMH charging. Two on-board p-channel MOSFETs allow the evaluation of backup switchover from the primary source. Low-voltage backup cells can be stepped up by the on-chip synchronous-rectified step-up DC-DC converter, which has a default setting of 3.3V on the EV kit and is capable of 50mA output current. A secondary output provided by an on-chip LDO has a 2.5V output voltage for the MAX8568A and is capable of providing 10mA output current. When the main battery is connected, these two voltages are typically provided by a MAX1586/MAX1587 multi-output complete system power supply. The MAX8568A EV kit can also evaluate the MAX8568B. To evaluate the MAX8568B, order a free sample along with this EV kit.
Applications
- DSCs and DVCs
- Internet Appliances and Web-Books
- Palmtops and Wireless Handhelds
- PDAs and PDA Phones
- Smartphones