Datasheet
TPS54618
SLVSAE9D –NOVEMBER 2010–REVISED DECEMBER 2013
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ELECTRICAL CHARACTERISTICS (continued)
T
J
= –40°C to 150°C, VIN = 2.95 to 6 V (unless otherwise noted)
DESCRIPTION CONDITIONS MIN TYP MAX UNIT
CURRENT LIMIT
VIN = 6 V, 25°C < T
J
< 150°C 7.46 10.6 15.3
Current limit threshold A
VIN = 2.95 V, 25°C < T
J
< 150°C 7.68 10.2 13.5
THERMAL SHUTDOWN
Thermal Shutdown 168 °C
Hysteresis 20 °C
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Switching frequency range using RT mode 200 2000 kHz
Switching frequency Rt = 400 kΩ 400 500 600 kHz
Switching frequency range using CLK mode 300 2000 kHz
Minimum CLK pulse width 75 ns
RT/CLK voltage R
(RT/CLK)
= 400 kΩ 0.5 V
RT/CLK high threshold 1.6 2.2 V
RT/CLK low threshold 0.4 0.6 V
RT/CLK falling edge to PH rising edge delay Measure at 500 kHz with RT resistor in series 90 ns
PLL lock in time Measure at 500 kHz 42 μs
PH (PH PIN)
Measured at 50% points on PH, I
OUT
= 3 A 75
Minimum On time ns
Measured at 50% points on PH, VIN = 6 V,
120
I
OUT
= 0 A
Prior to skipping off pulses, BOOT-PH = 2.95 V,
Minimum Off time 60 ns
I
OUT
= 3 A
Rise Time 2.25
VIN = 6 V, 6 A V/ns
Fall Time 2
BOOT (BOOT PIN)
BOOT Charge Resistance VIN = 5 V 16 Ω
BOOT-PH UVLO VIN = 2.95 V 2.1 V
SLOW START AND TRACKING (SS/TR PIN)
Charge Current V
(SS/TR)
= 0.4 V 2 μA
SS/TR to VSENSE matching V
(SS/TR)
= 0.4 V 54 mV
SS/TR to reference crossover 98% normal 1.1 V
SS/TR discharge voltage (Overload) VSENSE = 0 V 61 mV
SS/TR discharge current (Overload) VSENSE = 0 V, V
(SS/TR)
= 0.4 V 350 µA
SS discharge current (UVLO, EN, Thermal
VIN = 5 V, V(SS) = 0.5 V 1.9 mA
fault)
POWER GOOD (PWRGD PIN)
VSENSE falling (Fault) 91
VSENSE rising (Good) 93
VSENSE threshold % Vre
VSENSE rising (Fault) 109
VSENSE falling (Good) 107
Hysteresis VSENSE falling 2 % Vref
Output high leakage VSENSE = VREF, V
(PWRGD)
= 5.5 V 7 nA
On resistance 56 100 Ω
Output low I
(PWRGD)
= 3 mA 0.2 0.3 V
Minimum VIN for valid output V
(PWRGD)
< 0.5 V at 100 μA 0.65 1.5 V
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