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High level of integration bluetooth headset power management solutions |
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| Date Added: February 17, 2011 06:46:07 AM | |
| Author: goodscoolwang | |
| Category: Business & Economy | |
Introduction: As more and more Bluetooth-enabled mobile phones, Bluetooth headsets have become essential for mobile phone option. Bluetooth headset peripheral component power management design requirements for small, high integration, while meeting the Bluetooth chip on the load response and noise suppression requirements. Wireless stereo headphones into the hot products in 2005. As more and more Bluetooth-enabled mobile phones, Bluetooth headsets have become essential for mobile phone option. Meanwhile, with support for MP3 playback the introduction of Bluetooth stereo headphones, Bluetooth headset can be connected to a Bluetooth mobile phone and music player, which is bound to bring new highlights of Bluetooth applications. Bluetooth RF and baseband processor core is in two parts, to meet the functional integration and miniaturization of the design, CSR, Broadcom and other companies have integrated RF and baseband functions, In addition, based on the ARM or DSP core requires two power Bluetooth chip (such as 1.8V and 2.7V), respectively, on the core and I / O power supply. Meanwhile, the microphone also need a "clean" the bias voltage. Based on the above system power requirements, Microchip introduced a highly integrated, small size of the power management program, including the TC1303 and the MCP73855. Which, TC1303 is a highly integrated power conversion chip, MCP73855 Li-ion battery for high integrated linear charger chip. TC1303 at 3% 26; # 215; 3mm 10-pin DFN package integrates a 500mA synchronous buck converter and a 300mA low dropout LDO, and has a power good pin (Power-Good). The standard fixed output voltage combinations, such as 1.8V/2.7V, just to satisfy the requirements for power BlueCore2. Figure 1 TC1303 Bluetooth headset on the application circuit. Figure 1: TC1303 Bluetooth headset in the application circuit. Figure 500mA synchronous DC / DC converters with integrated P-channel and N-channel MOSFET, using 2MHz switching frequency, the conversion efficiency of 92% or more. High switching frequency and PWM / PFM automatic switching technology will enable engineers to select the table attached as low as 2.2μH inductors and ceramic capacitors, filters, and Bluetooth chip can meet the requirements of the ripple. Within the integrated LDO TC1303 provides 300mA of output current, and only 137mV voltage difference. In order to further reduce the DC / DC switching noise impact on circuit design, chip design will LDO ground pin and power DC / DC power supply to pin separately to ensure that the LDO output can give I / O section and a microphone to provide "clean" voltage. Figure 2: MCP73855 in Bluetooth headset design of the circuit. TC1303 offers the power good pin can be connected to the Bluetooth chip I / O, to monitor the status of the supply voltage. Power Good pin can detect the DC / DC output voltage (TC1303A) or the LDO output voltage (TC1303B), even these two outputs were detected, in order to achieve power, the power supply to meet the different requirements of the Bluetooth chip(cheap bluetooth headset). MCP73855 Li-ion battery charge management features available, on-chip integration of the MOSFET, current sense resistor and the reverse blocking diode to provide maximum 400mA of charge current, and through external resistor, or directly from the I / O output to set the desired charge current . MCP73855 Li-ion battery can be automatically pre-charge, constant current, constant voltage charge control, and the charge status output to the LED, or the Bluetooth chip. With appropriate external circuit, the charge status indicator pin to drive two-color LED, to achieve the end of the charging process and charge shown separately. Figure 2 MCP73855 in Bluetooth headset design circuit. TC1303 and MCP73855 small size package (3% 26; # 215; 3mm), and simple external circuit, forming a low-cost, high performance, highly integrated Bluetooth headset power management program, which also apply to the latest MP3 player stereo Bluetooth headset designs. Engineers use it and Bluetooth chips can be designed to be more comfortable, stylish, easy to use, and lightweight Bluetooth stereo headset, allowing users to enjoy music on the move, and never miss a call.From: wholesale bluetooth headsets |
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