ZXLD381 Datasheet | Zetex Semiconductors

Features - - - - - - - 85% Efficiency User adjustable output current Single cell operation (0.9V minimum) Low saturation transistor SOT23-3 package Available also in Die form Simple Application circuit voltage switching Applications - - - LED flashlights and torches LED backlights White LED driver VIN L1 VC C LED VOUT GN D ZXLD381 Issue 1 - April 2008 © Zetex Semiconductors plc 2008 .zetex. .. Absolute maximum ratings Supply Voltage (VCC) Output Voltage (VOUT) Supply Current Output Switch Current Power Dissipation SOT23-3 Power Dissipation Die Operating Temperature Range Storage Temperature Range -0.6V to 10V -0.6V to 20V 20m A 800m A 450m W 1W 0°C to +85°C -55°C to +150°C Electrical Characteristics Measured at TAMB = 25°C, L = 4.7μH and VCC = 1.5V unless otherwise specified. Parameter Conditions Min Supply Voltage Operating Range Minimum Supply Start-up Voltage Switch Current Switch Saturation Voltage Switch Leakage Current Mean LED Current Efficiency L = 10μH L = 10μH At turn-off IOUT = 200m A VOUT = 20V VLED = 3.5V VLED = 3.5V 40 40 250 0.9 0.8 320 100 70 55 85 Limits Typ Max 2.2 0.9 400 300 120 70 V V m A m V μA m A % Units Operating Frequency Discharge Pulse Width VLED = 3.5V 0.7 350 1.5 2.5 k Hz μs Issue 1 - April 2008 © Zetex Semiconductors plc 2008 .zetex. .. Typical Characteristics ZXLD 381 IOUT(AVE RAGE ) v s VCC fo r L = 2.2u H to 47u H 100 90 80 2. 2u H 70 3. 3u H 60 50 40 30 20 10 0 0.8 1 1.2 1.4 1. 6 1. 8 2 4. 7u H 6. 8u H 10u H 15u H 22u H 47u H 70 3. 3u H 100 90 80 2. 2u H ZXLD381 Ef ficiency vs VC C fo r L = 2.2u H to 47u H Efficie ncy (%) IOUT (m A) 60 50 40 30 20 10 0 0. 8 1 1.2 1.4 1.6 1. 8 2 4. 7u H 6. 8u H 10u H 15u H 22u H 47u...