Datasheet LT6109-1, LT6109-2 (Analog Devices) - 9

LT6109-1/LT6109-2
PIN FUNCTIONS INC1 (Pin 6):
This is the inverting input of comparator 1.
V+ (Pin 9):
Positive Supply Pin. The V+ pin can be con- The second input of this comparator is internally connected nected directly to either side of the sense resistor, RSENSE. to the 400mV reference. When V+ is tied to the load end of the sense resistor, the
INC2 (Pin 7):
This is the input of comparator 2. For the SENSEHI pin can go up to 0.2V above V+. Supply current LT6109-1 this is the noninverting input of comparator 2. is drawn through this pin. For the LT6109-2 this is the inverting input of compara-
SENSEHI (Pin 10):
Sense Amplifier Input. The internal tor 2. The second input of each of these comparators is sense amplifier will drive SENSEHI to the same potential internally connected to the 400mV reference. as SENSELO. A resistor (typically RIN) tied from supply
OUTA (Pin 8):
Current Output of the Sense Amplifier. This to SENSEHI sets the output current, IOUT = VSENSE/RIN, pin will source a current that is equal to the sense voltage where VSENSE is the voltage developed across RSENSE. divided by the external gain setting resistor, RIN.
BLOCK DIAGRAMS
9 LT6109-1 V+ 100Ω 3k SENSEHI 34V 6V 10 – SENSELO 3k 1 + OUTA 8 V– V– V– V+ 200nA EN/RST 2 ENABLE AND RESET TIMING RESET V+ + INC2 7 UNDERCURRENT FLAG OUTC2 3 – V– 400mV V+ REFERENCE + OVERCURRENT FLAG OUTC1 4 – INC1 6 V– 5 610912 F01
Figure 1. LT6109-1 Block Diagram (Comparators with Opposing Polarity)
610912fa 9 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagrams Applications Information Typical Applications Package Description Revison History Typical Application Related Parts