Power Electronics / Power Management


DC/DC controller operates from 1,8 to 20 V

25 October 2000 Power Electronics / Power Management

Linear Technology's LT1619; a current-mode step-up DC/DC controller designed for a wide range of SEPIC, flyback and isolated power supplies, uses a lower value of sense resistor compared to other solutions, which improves efficiency up to 5%, says the company. The device's constant 300 kHz operating frequency reduces the value and size of the inductor and capacitors, which also simplifies filtering. Its clock frequency is synchronisable to 500 kHz. The wide input voltage range of 1,8 to 20 V makes it ideal for applications such as flyback, 3X V conversion to 5, 12 or 15 V output in distributed power and 5 to -48 V telecom applications, as well as automotive power supplies.

The LT1619's low 53 mV full-scale sense voltage permits use of the lowest value sense resistor for a given output current minimising I2R losses. To further improve efficiency, the IC's burst mode operation maximises efficiency at light load currents. Its powerful 1,5 A MOSFET driver is designed to drive a low side power transistor simplifying the design of boost, SEPIC, flyback and other topologies. Low 140 µA supply current and 15 µA shutdown conserve battery energy especially important in systems that have a high sleep-to-run time ratio.

The LT1619 is offered in 8-lead MSOP and SOIC packages.





Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

USB charger solution with high power density
Altron Arrow Power Electronics / Power Management
Diodes Incorporated has launched a three-chip solution for enhancing the performance of ultra-high-power-density USB Type-C power delivery (PD) systems. These products can be used in a wide variety of ...

Read more...
Totem pole PFC controller
EBV Electrolink Power Electronics / Power Management
A new addition was made to ON Semiconductor’s solution set for ultra-high density offline power supplies in the form of the NCP1680, a dedicated critical conduction mode totem pole PFC controller. It ...

Read more...
Compact offline switcher ICs
EBV Electrolink Power Electronics / Power Management
Power Integrations introduced LinkSwitch-TNZ, a new switching power supply IC that combines offline power conversion, lossless zero-crossing detection and optionally, X-capacitor discharge functions in ...

Read more...
100 W and 300 W eighth-brick converters
Brabek Power Electronics / Power Management
Recom has introduced two new cost-effective DC/DC products with outputs of 100 W and 300 W in a DOSA-compatible, low-profile, through-hole eighth-brick format (58,4 x 23 mm). The RPA100E-W 100 W part ...

Read more...
High-side current sense amplifier with adjustable gain
NuVision Electronics Power Electronics / Power Management
The MPQ8112A is a low-cost, unipolar, high-side current sense amplifier that operates from a 2,7 V to 60 V supply and typically consumes a 300 μA current. The Monolithic Power Systems part is ideal for ...

Read more...
Super-junction 800 V MOSFETs
Altron Arrow Power Electronics / Power Management
The new super-junction STPOWER MDmesh K6 series from STMicroelectronics enhances several key parameters to minimise system-power losses. It is especially suited to lighting applications based on flyback ...

Read more...
DC/DC converter for forklift trucks
Vepac Electronics Power Electronics / Power Management
The DC/DC converters of the series PCMDS550-FT from MTM Power are tailor-made to meet the requirements in forklift truck technology. Highest quality and safety are of particular importance when using ...

Read more...
Wide-input buck converters in tiny package
Brabek Power Electronics / Power Management
RECOM now offers through-hole, 1/32nd brick footprint, non-isolated DC/DC converters by way of the RPMA-4.5 and RPMA-8.0, with 4,5&nbs;A and 8 A output ratings respectively. Each part has a wide 9-53 V input ...

Read more...
Air-insulated HV power supplies
Vepac Electronics Power Electronics / Power Management
XP Glassman’s OQ Series of high-voltage AC/DC power supplies are sophisticated 8 kW or 16 kW open-stack units with extremely low ripple and noise. The air-insulated, fast-response supplies exhibit tight ...

Read more...
Integrated buck power module with configurable settings
NuVision Electronics Power Electronics / Power Management
The MP5479 is a complete power management solution that integrates four high-efficiency step-down (buck) DC/DC converters, five low-dropout (LDO) regulators and a flexible I2C interface. Constant-on-time ...

Read more...