Datasheet
Delay due to
hysteresis
IRQ
VTHRES
VCOMP
IRQ
VTHRES
VCOMP
+
-
LM10506
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SNVS729E –SEPTEMBER 2011–REVISED MARCH 2013
COMPARATOR
The comparator on the LM10506 takes its inputs from the VCOMP pin and an internal threshold level which is
programmed by the user. The threshold level is programmable between 2.0 and 4.0V with a step of 31 mV and a
default comp code of 0x19. The output of the comparator is the IRQ pin. Its polarity can be changed using
Register 0x0E bit 0. If IRQ_polarity = 0 → Active low (default) is selected, then the output is low if V
COMP
value is
greater than the threshold level. The output is high if the V
COMP
value is less than the threshold level. If
IRQ_polarity = 1 → Active high is selected then the output is high if V
COMP
value is greater than the threshold
level. The output is low if the V
COMP
value is less than the threshold level. There is some hysteresis when V
COMP
transitions from high to low, typically 60 mV. There is a control bit in register 0x0B, comparator control, that can
double the hysteresis value.
RECOMMENDATIONS FOR UNUSED FUNCTIONS AND PINS
If any function is not used in the end application then the following recommendations for tying-off the associated
pins on the circuit boards should be used.
FUNCTION PIN IF UNUSED
BUCK1 VIN_B1 Connect to VIN
SW_B1 Connect to VIN
FB_B1 Connect to GND
BUCK2 VIN_B2 Connect to VIN
SW_B2 Connect to VIN
FB_B2 Connect to GND
BUCK3 VIN_B3 Connect to VIN
SW_B3 Connect to VIN
FB_B3 Connect to GND
SPI SPI_CS Connect to VIN_IO
SPI_DI Connect to GND
SPI_DO Connect to GND
SPI_CK Connect to GND
HL_B2 Connect to GND
HL_B3 Connect to VIN
STANDBY Connect to GND
RESET Connect to VIN_IO
COMPARATOR VCOMP Connect to VIN
IRQ Leave open
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