TPS54620
SLVS949 – MAY 2009 ........................................................................................................................................................................................................
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ELECTRICAL CHARACTERISTICS (continued)
T
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= – 40 ° C to 150 ° C, VIN = 4.5V to 17V, PVIN = 1.6V to 17V (unless otherwise noted)
DESCRIPTION CONDITIONS MIN TYP MAX UNIT
THERMAL SHUTDOWN
Thermal shutdown 160 175 ° C
Thermal shutdown hysterisis 10 ° C
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Minimum switching frequency Rrt = 240 k Ω (1%) 180 200 220 kHz
Switching frequency Rrt = 100 k Ω (1%) 400 480 560 kHz
Maximum switching frequency Rrt = 29 k Ω (1%) 1440 1600 1760 kHz
Minimum pulsewidth 20 ns
RT/CLK high threshold 2 V
RT/CLK low threshold 0.8 V
RT/CLK falling edge to PH rising edge delay Measure at 500 kHz with RT resistor in series 66 ns
Switching frequency range (RT mode set point 200 1600 kHz
and PLL mode)
PH (PH PIN)
Minimum on time Measured at 90% to 90% of VIN, 25 ° C, I
PH
= 2A 94 135 ns
Minimum off time BOOT-PH ≥ 3 V 0 ns
BOOT (BOOT PIN)
BOOT-PH UVLO 2.1 3 V
SLOW START AND TRACKING (SS/TR PIN)
SS charge current 2.3 µ A
SS/TR to VSENSE matching V(SS/TR) = 0.4 V 29 60 mV
POWER GOOD (PWRGD PIN)
VSENSE threshold VSENSE falling (Fault) 91 % Vref
VSENSE rising (Good) 94 % Vref
VSENSE rising (Fault) 109 % Vref
VSENSE falling (Good) 106 % Vref
Output high leakage VSENSE = Vref, V(PWRGD) = 5.5 V 30 100 nA
Output low I(PWRGD) = 2 mA 0.3 V
Minimum VIN for valid output V(PWRGD) < 0.5V at 100 µ A 0.6 1 V
Minimum SS/TR voltage for PWRGD 1.4 V
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