Archive : 6 August 2008 год

Renesas Technology Europe announced the availability in Europe of the RJK0383DPA, a dual-type power MOSFET for synchronous rectification DC/DC converters. The device achieves higher power supply efficiency and can be used for memory or ASICs in products such as laptop PCs and communication devices. Sample shipments will begin in October 2008. RJK0383DPA incorporates dual power MOSFETs of two different types, composing a synchronous rectification DC/DC converter in a WPAK high-thermal-radiation package measuring 5.1 × 6.1 mm and 0.8 mm thick (max.). The device integrates dual power MOSFETs of two different types, one as the high-side elementand the other as the low-side element. The high-side power MOSFET has a drain-gate load (Qgd) of 1.5 nC (at VDD=10V) to provide high switching speed and correspondingly high efficiency.

 The low-side power MOSFET has an on-resistance (RDS (on)) of 3.7 mOhm (typ.: at 4.5 V) to reduce power loss. In addition, a Schottky barrier diode (SBD) is integrated on the same chip as the low-side power MOSFET to minimize the wiring inductance between them. This speeds up the switch of current flow to the Schottky barrier diode during the DC/DC converter's dead time, further reducing loss. It also has the effect of suppressing voltage spikes during switching, thereby reducing noise. The RJK0383DPA will be followed by two additional products having different output current ratings, the RJK0384DPA and RJK0389DPA. In future more products suitable for other DC/DC converter power supply specifications will be added to the series in response to the needs of the market.
 

Maxim Integrated Products introduces the DS7505 ±0.5°C accurate, digital temperature sensor and thermostat with nonvolatile memory (EEPROM). The integration of nonvolatile EEPROM enables this device to power-up with a user-defined configuration and thermostat thresholds, whereas other similar devices store threshold and configuration data in volatile memory and, therefore, can only power-up in the factory-defined state. Software and pin compatible with the industry-standard LM75 and Maxim's DS75, the DS7505 is ideal for applications that require high-accuracy temperature sensing, such as base-station, telecom, networking, and medical systems.

 The DS7505 is factory calibrated to provide ±0.5°C accuracy over its entire supply-voltage range and a wide, 0°C to +70°C temperature range. It is ±2.0°C (max) accurate over its full, -55°C to +125°C operating-temperature range. Thermometer resolution is reported as user-selectable 9-, 10-, 11-, or 12-bit digital readings that translate to temperature increments between 0.5°C (9 bit) and 0.0625°C (12 bit). To further enhance flexibility, the DS7505's user-defined configuration options include active or standby state, conversion resolution, thermostat mode, output polarity, and fault tolerance. Additionally, the nonvolatile thermostat and configuration registers allow the device to power-up and operate as a stand-alone thermostat with no need to communicate with a microcontroller.

 The DS7505 operates from a low, 1.7V to 3.7V supply voltage and can, therefore, be connected directly to low-voltage supply rails. Because the device is function, pin, and software compatible with the popular LM75/DS75, it is easy to migrate to low-voltage and/or higher-precision designs using the DS7505. Communication with the DS7505 is achieved through a standard 2-wire (I²C) serial interface. The DS7505 is available in a lead-free, 8-pin SO package; an 8-pin µSOP (µMAX®) package with an exposed pad is available as demand warrants. Prices start at $1.40 (1000-up, FOB USA).