LT8611 PIN FUNCTIONS ISN (Pin 22): Current Sense (–) Pin. This is the inverting ICTRL (Pin 24): Current Adjustment Pin. ICTRL adjusts input to the current sense amplifier. the maximum ISP-ISN drop before the LT8611 reduces IMON (Pin 23): Proportional-to-Current Monitor Output. output current. Connect directly to INTVCC or float for This pin sources a voltage 20 times the voltage between full-scale ISP-ISN threshold of 50mV or apply values the ISP and ISN pins such that: between GND and 1V to modulate current limit. There is an internal 1.4µA pull-up current on this pin. Float or tie VIMON = 20 • (VISP-VISN). to INTVCC when unused. IMON can source 200µA and sink 10µA. Float IMON if GND (Exposed Pad Pin 25): Ground. The exposed pad unused. must be connected to the negative terminal of the input capacitor and soldered to the PCB in order to lower the thermal resistance. BLOCK DIAGRAM VIN VIN C 5, 6 IN – INTERNAL 0.97V REF + 3.4V BIAS R3 1V + REG 18 OPT EN/UV 4 – SHDN SLOPE COMP INTV R4 CC 17 OPT C OSCILLATOR VCC ERROR PG 200kHz TO 2.2MHz BST 19 ±9% AMP 6 + V C + C BURST SWITCH M1 BST V – DETECT LOGIC SW L OUT AND ANTI- 13-15 SHOOT SHDN C1 R1 TSD THROUGH M2 INTVCC UVLO R2 VIN UVLO FB PGND 20 C SHDN SS 7, 8 TSD (OPT) 2.2µA VIN UVLO TR/SS R 2 + ISP 21 C R F R T RT 3 – – SEN R ISN + 22 VOUT SYNC + 1.0V 20R 1 COUT 1× 1.4µA GND ICTRL IMON 8611 BD 25 24 23 8611fa 10 For more information www.linear.com/LT8611 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
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