Datasheet

TPS5401
SLVSAB0 –DECEMBER 2010 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
T
J
= –40°C to 150°C, V
IN
= 3.5 V to 42 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Switching-frequency range using RT
100 2500 kHz
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 R
T
resistor in series 60 ns
edge delay
PLL lock-in time Measured at 500 kHz 100 ms
SLOW-START AND TRACKING (SS/TR PIN)
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 V
SS/TR discharge current (overload) V
VSENSE
= 0 V, V
SS/TR
= 0.4 V 112 mA
SS/TR discharge voltage V
VSENSE
= 0 V 54 mV
POWER GOOD (PWRGD PIN)
V
VSENSE
falling 92%
VSENSE low threshold V
ref
V
VSENSE
rising 94%
V
VSENSE
rising 109%
VSENSE high threshold V
ref
V
VSENSE
falling 107%
Hysteresis V
VSENSE
falling 2%
Output-high leakage V
VSENSE
= V
ref
, V
PWRGD
= 5.5 V, 25°C 10 nA
On-resistance I
PWRGD
= 3 mA, V
VSENSE
< 0.77 V 50 Ω
Minimum V
IN
for defined output V
PWRGD
< 0.5 V, I
PWRGD
= 100 mA 0.95 1.5 V
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