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LT3420EMS Datasheet(PDF) 2 Page - Linear Technology |
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LT3420EMS Datasheet(HTML) 2 Page - Linear Technology |
2 / 20 page LT3420/LT3420-1 2 3420fa VCC Voltage .............................................................. 16V VBAT Voltage ............................................................ 16V SW Voltage (Note 2) LT3420 ................................................................ 38V LT3420-1 ............................................................ 50V SEC Current ...................................................... ±200mA RFB Current ........................................................... ±3mA RREF Voltage ........................................................... 2.5V CHARGE Voltage ...................................................... 16V CT Voltage .............................................................. 1.5V DONE Voltage .......................................................... 16V Current into DONE Pin .......................................... ±1mA Maximum Junction Temperature .......................... 125 °C Operating Ambient Temperature Range (Note 3) .............................................. – 40 °C to 85°C Storage Temperature Range ................. – 65 °C to 150°C Lead Temperature (Soldering, 10 sec).................. 300 °C ORDER PART NUMBER MS PART MARKING TJMAX = 125°C, θJA = 100°C/W, θJC = 45°C/W (4-LAYER BOARD) LTYH LTAJG LT3420EMS LT3420EMS-1 ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = VBAT = 3.3V, VCHARGE = VCC unless otherwise noted. (Note 3) PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Operating Voltage, VCC q 2.2 2.5 V Maximum Operating Voltage, VCC 16 V VCC UVLO Hysteresis 40 mV Minimum VBAT Voltage 1.6 1.8 V Maximum VBAT Voltage 16 V VBAT UVLO Hysteresis 275 mV RREF Threshold Voltage 0.98 1.00 1.02 V q 0.975 1.025 V RREF Pin Bias Current VRREF = 0V, Switching 2 4 µA VRFB = VBAT – 0.2V (Note 4) Quiescent Current VRREF = 1.1V, Not Switching 90 130 µA Quiescent Current in Shutdown VCHARGE = 0V, VIN = 3.3V 0.01 1 µA Primary Side Current Limit LT3420 (Note 5) 1.20 1.4 1.60 A LT3420-1 (Note 5) 0.75 0.9 1.05 A Secondary Side Current Limit LT3420 (Note 5) 20 40 50 mA LT3420-1 (Note 5) 5 15 25 mA Leakage Blanking Pulse Width LT3420 200 ns LT3420-1 0 ns Refresh Timer Charge/Discharge Current VCT = 0.75V 1.5 2.5 3.5 µA Refresh Timer Upper Threshold 0.9 1.0 1.1 V Refresh Timer Lower Threshold 0.45 0.5 0.55 V Consult LTC Marketing for parts specified with wider operating temperature ranges. 1 2 3 4 5 RREF VBAT RFB VCC GND 10 9 8 7 6 CT CHARGE DONE SEC SW TOP VIEW MS10 PACKAGE 10-LEAD PLASTIC MSOP |
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