Datasheet

TPS54622
SLVSA70B –MARCH 2011–REVISED JANUARY 2014 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
T
J
= –40°C to 150°C, VIN = 4.5V to 17V, PVIN = 1.6V to 17V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
High-side switch current limit threshold 8 11 14 A
Low-side switch sourcing current limit 6.5 10 15 A
Low-side switch sinking current limit 2 3 4 A
Hiccup wait time 512 Cycles
Hiccup time before re-start 16384 Cycles
THERMAL SHUTDOWN
Thermal shutdown 160 175 °C
Thermal shutdown hysteresis 10 °C
Thermal shutdown hiccup time 16384 Cycles
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Minimum switching frequency Rrt = 240 kΩ (1%) 160 200 240 kHz
Switching frequency Rrt = 100 kΩ (1%) 400 480 560 kHz
Maximum switching frequency Rrt = 29 kΩ (1%) 1440 1600 1760 kHz
Minimum pulse width 20 ns
RT/CLK high threshold 2 V
RT/CLK low threshold 0.8 V
Measure at 500 kHz with RT resistor
RT/CLK falling edge to PH rising edge delay 66 ns
in series
Switching frequency range (RT mode set point
200 1600 kHz
and PLL mode)
PH (PH PIN)
Measured at 90% to 90% of VIN,
Minimum on time 94 145 ns
25°C, I
PH
= 2A
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 μA
SS/TR to VSENSE matching V
(SS/TR)
= 0.4 V 20 60 mV
POWER GOOD (PWRGD PIN)
VSENSE threshold VSENSE falling (Fault) 92 % Vref
VSENSE rising (Good) 94 % Vref
VSENSE rising (Fault) 106 % Vref
VSENSE falling (Good) 104 % 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 μA 0.6 1 V
Minimum SS/TR voltage for PWRGD 1.4 V
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