Datasheet

TPS54060
SLVS919A –JANUARY 2009–REVISED JULY 2010 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
T
J
= –40°C to 150°C, VIN = 3.5 to 60V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
CURRENT LIMIT
Current limit threshold VIN = 12 V, T
J
= 25°C 0.6 0.94 A
THERMAL SHUTDOWN
Thermal shutdown 182 °C
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Switching Frequency Range using
100 2500 kHz
RT mode
f
SW
Switching frequency R
T
= 200 kΩ 450 581 720 kHz
Switching Frequency Range using
300 2200 kHz
CLK mode
Minimum CLK input pulse width 40 ns
RT/CLK high threshold 1.9 2.2 V
RT/CLK low threshold 0.5 0.7 V
RT/CLK falling edge to PH rising
Measured at 500 kHz with RT resistor in series 60 ns
edge delay
PLL lock in time Measured at 500 kHz 100 ms
SLOW START AND TRACKING (SS/TR)
Charge current V
SS/TR
= 0.4 V 2 mA
SS/TR-to-VSENSE matching V
SS/TR
= 0.4 V 45 mV
SS/TR-to-reference crossover 98% nominal 1.0 V
SS/TR discharge current (overload) VSENSE = 0 V, V(SS/TR) = 0.4 V 112 mA
SS/TR discharge voltage VSENSE = 0 V 54 mV
POWER GOOD (PWRGD PIN)
VSENSE falling 92%
VSENSE rising 94%
V
VSENSE
VSENSE threshold
VSENSE rising 109%
VSENSE falling 107%
Hysteresis VSENSE falling 2%
Output high leakage VSENSE = VREF, V(PWRGD) = 5.5 V, 25°C 10 nA
On resistance I(PWRGD) = 3 mA, VSENSE < 0.79 V 50 Ω
Minimum VIN for defined output V(PWRGD) < 0.5 V, II(PWRGD) = 100 mA 0.95 1.5 V
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