Datasheet LT3844 (Analog Devices) - 8

LT3844
FuncTional DiagraM
VIN UVLO (<4V) 8V REGULATOR V BOOSTED SWITCH IN V BOOST CC DRIVER BST V 1 IN UVLO 16 UVLO (<6V) CIN CBOOST 3.8V INTERNAL REGULATOR SUPPLY RAIL TG DRIVE V M1 REF CONTROL DRIVER 15 RA FEEDBACK – + REFERENCE 1.231V SW L1 RSENSE 14 V NOL OUT SWITCH D2 D1 C SHDN OUT + LOGIC VCC 2 13 RB – CVCC D3 DRIVE CONTROL PGND (OPTIONAL) BURST_EN – 12 4 VFB 5 + SYNC R1 R2 – g + 7 m ERROR 0.5V OSCILLATOR AMP fSET 100mV 8 Q S VC – RSET 6 R SLOPE COMP GENERATOR CC2 – RC + CURRENT SENSE CC1 COMPARATOR + SOFT-START ~1V BURST DISABLE CSS CLAMPED TO VFB + VBE + – + SGND Burst Mode 9 VREF + 200mV – OPERATION 3 2µA C SENSE+ SS 11 FAULT CONDITION: SENSE– V 50µA IN UVLO 10 VCC UVLO VSHDN UVLO 3844 FD 3844fc 8 For more information www.linear.com/LT3844 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts