The Industry's Smallest High-performance Charge Protection IC for Mobile USB Devices
12.05.2007
has recently developed the most compact high-performance USB charge protection IC to protect battery driven (i.e. nickel hydride, lithium ion) devices from damage due to excessive current or voltage surges during USB charging. The BD6040GUL features improved safety design and integrates high performance protection circuits (i.e. low 125mΩ ON-resistance FET switch, 28V overvoltage lockout, undervoltage lockout, overcurrent protection, startup delay, and temperature protection) into a 1.6 x 1.6mm2 ultra-compact CSP (chip scale package) that reduces mounting area by 30% over conventional products. A market-leading current consumption of 45µA makes it ideal for battery charging via USB or adapter for mobile phones, portable audio players, IC recorders, digital cameras, and handheld gaming devices.
Sample shipments began October (sample price: $1.40/unit), with mass production scheduled for December.
· Main features of the BD6040GUL
- Ultra-compact CSP package (1.6mm×1.6mm×0.55mm max)
- Low 45µA current consumption
- Built-in 28V overvoltage protection circuit
- Low ON-resistance FET (125mΩ)
- Integrated OVLO (Over Voltage Lock Out) circuit (6.4V)
- Equipped with UVLO (Under Voltage Lock Out) circuit (2.65V)
- 2ms startup delay circuit incorporated
- Built-in overcurrent protection circuit (1.2A)
· Glossary
- Overvoltage Protection Circuit
Prevents damage by shutting off the output once the voltage from the adapter/USB cable exceeds a threshold value.
- Overcurrent Protection Circuit
Prevents damage due to excessive heat generation by shutting off the output once the current exceeds a predetermined value.
- USB interface
The de facto standard interface for connecting peripheral devices to PCs. Power supply via interface (bus power) and hot plugging are enabled. USB 2.0 stipulates a maximum transmission speed of 480Mbps. Plug-and-play is standard, and a maximum of 127 devices can be connected via USB hub. Communication is performed between a host (i.e. PC) and device, with the host determining the communication protocol. Host permission is also required when transmitting data from the device side. A maximum of 5V and 500mA can be supplied from the host to the device.
- OVLO (Over Voltage Lock Out)
Monitors the input voltage and switches off the output once the voltage exceeds a certain level.
- UVLO (Under Voltage Lock Out)
Monitors the input voltage and switches off the output once voltage decreases to below a preset level.
- Startup delay circuit
Provides a delay of a certain period until there is output after input of the power supply voltage, preventing damage to peripheral circuitry due to abnormal input caused by surges.
