TPS54260
SLVSA86 –MARCH 2010
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ELECTRICAL CHARACTERISTICS (continued)
TJ = –40°C to 150°C, VIN = 3.5 to 60V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Switching Frequency Range using
RT mode
100
450
300
2500
720
kHz
kHz
kHz
fSW
Switching frequency
RT = 200 kΩ
581
Switching Frequency Range using
CLK mode
2200
Minimum CLK input pulse width
RT/CLK high threshold
40
1.9
0.7
ns
V
2.2
RT/CLK low threshold
0.5
V
RT/CLK falling edge to PH rising
edge delay
Measured at 500 kHz with RT resistor in series
Measured at 500 kHz
60
ns
PLL lock in time
100
ms
SLOW START AND TRACKING (SS/TR)
Charge current
VSS/TR = 0.4 V
2
45
mA
mV
V
SS/TR-to-VSENSE matching
SS/TR-to-reference crossover
SS/TR discharge current (overload)
SS/TR discharge voltage
VSS/TR = 0.4 V
98% nominal
1.15
382
54
VSENSE = 0 V, V(SS/TR) = 0.4 V
VSENSE = 0 V
mA
mV
POWER GOOD (PWRGD PIN)
VSENSE falling
92%
94%
109%
107%
2%
VSENSE rising
VVSENSE
VSENSE threshold
VSENSE rising
VSENSE falling
Hysteresis
VSENSE falling
Output high leakage
On resistance
VSENSE = VREF, V(PWRGD) = 5.5 V, 25°C
I(PWRGD) = 3 mA, VSENSE < 0.79 V
V(PWRGD) < 0.5 V, II(PWRGD) = 100 mA
10
nA
Ω
50
Minimum VIN for defined output
0.95
1.5
V
4
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