ZXSC400 Datasheet | Zetex Semiconductors

DESCRIPTION The ZXSC400 is a voltage mode boost converter in the SOT23-6 package. Its low feedback voltage allows the current in a chain of LEDs to be set and accurately monitored with a single resistor giving minimal losses. Its excellent load and line regulation means that for the full supply range from lithium-ion cells, the LED current will typically change by less than 1%. Using high efficiency Zetex switching transistors with ratings of 20V and higher allow many LEDs to be chained in series for the best LED current matching possible. FEATURES - 1.8V to 8V supply range - Typical output regulation of Ϯ1% - Over 80% typical efficiency - 4.5␮A typical shutdown current - Series connection for ultimate LED current matching SOT23-6 APPLICATIONS - White LED backlighting for colour LCD panels - General LED backlighting - High performance white LED flashlights - General LED driving from batteries PINOUT ORDERING INFORMATION DEVICE ZXSC400E6TA REEL SIZE 7“ TAPE WIDTH 8mm QUANTITY PER REEL 3000 units VCC GND STDN Top View DRIVE VFB SENSE DEVICE MARKING - C400 ISSUE 1 - JANUARY 2003 1 ABSOLUTE MAXIMUM RATINGS VCC DRIVE EOR STDN SENSE Operating Temp. Storage Temp. Power Dissipation -0.3V to -0.3V to -0.3V to -0.3V to -0.3V to -40°C to -55°C to 450m W +10V VCC + 0.3V VCC + 0.3V The lower of (+5.0V) or (VCC + 0.3V) The lower of (+5.0V) or (VCC + 0.3V) +85°C +125°C ELECTRICAL CHARACTERISTICS Test Conditions VCC= 3V, T= -40°C to 85°C unless otherwise stated. Symbol Parameter Conditions Min Supply parameters V IN Iq 1 I STDN Eff 1 Acc REF TCO REF T DRIVE F OSC V SENSE I SENSE V FB I FB Limits Typ Max Units V CC Range Quiescent Current Shutdown Current Efficiency Reference tolerance Reference Temp Co Discharge pulse width Operating Frequency 1.8V < V CC < 8V 30m A > I LED > 10m A 1.8V < V CC < 8V V CC =...