ZXSC310 Datasheet | Zetex Semiconductors

DESCRIPTION The ZXSC310 is a single or multi cell LED driver designed for LCD backlighting applications. The input voltage range of the device is between 0.8V and 8V. This means the ZXSC310 is patible with single Ni MH, Ni Cd or Alkaline cells, as well as multi-cell or Li Ion batteries. The device features a shutdown control, resulting in a standby current less than 5µA, and an output capable of driving serial or parallel LED’s. The circuit generates constant power output, which are ideal for driving single or multiple LED’s over a wide range of operating voltages. These features make the device ideal for driving LED’s particularly in LCD backlight applications for Digital Still cameras and PDA’s. The ZXSC310 is a PFM DC-DC controller IC that drives an external Zetex switching transistor with a very low saturation resistance. These transistors are the best switching devices available for this type of conversion enabling high efficiency conversion with low input voltages. The drive output of the ZXSC310 LED driver generates a dynamic drive signal for the switching transistor. The circuit can start up under full load and operates down to an input voltage of 0.8 volts. The solution configuration ensures optimum efficiency over a wider range of load currents; several circuit configurations are possible depending on battery life versus brightness considerations. The ZXSC310 is offered in the SOT23-5 package which, when bined with a SOT23 switching transistor, generates a high efficiency small size circuit solution. The IC and discrete bination offers the ultimate cost Vs performance solution for LED backlight applications. FEATURES - 94% efficiency - Minimum operating input voltage 0.8V - Maximum operating input voltage 8V - Standby current less than 5µA - Programmable output current - Series or parallel LED configuration - Low saturation voltage switching transistor - SOT23-5 package TYPICAL APPLICATIONS CIRCUIT APPLICATIONS - LCD backlights: Digital still camera PDA...