Programmable USB/AC Battery Chargers Provide Dual Outputs

The SMB136 and SMB137B programmable battery charger ICs provide dual input source (USB or AC/DC) with arbitration, and dual output for system operation with a dead or missing battery. Both products support all battery charging standards: USB 2.0, USB On-The-Go Supplement, USB Battery Charging Specification 1.0, IEEE1725 Standard, Chinese USB Charging Specification, and others. Furthermore, proprietary CurrentPath technology detects the input source type (USB host/hub, AC/DC, and so on) and automatically optimizes operation for the fastest and safest battery charging. Both products meet the European Union Memorandum of Understanding, issued on June 29th, 2009, for standardized mobile phone chargers. The SMB136 and SMB137B are based on a 3-MHz, switch-mode architecture that requires minimal external components. High-efficiency operation enables fast charging due to higher output/charge currents, while reduced thermal dissipation improves user comfort, system reliability, and “green” operation. Summit’s proprietary TurboCharge technology enables high charge current, even from relatively low-power sources (example: up to 750 mA output from 500-mA USB source). Both products operate from 3.5-V to 6.2-V input, and also safely withstand continuous input over-voltage up to 18 V (non-operating) while protecting downstream circuitry. The SMB136 and SMB137B are offered in a 3-mm x 2.5-mm, 30-ball, lead-free chip-scale package with an operating temperature range of –30°C to +85°C. Available now in production quantities, the SMB136 is priced at $1.27 and the SMB137B is priced at $1.36 each in quantities of 10,000 units. SUMMIT MICROELECTRONICS, Sunnyvale, CA. (408) 523-1000.