Datasheet

TPS54260
SLVSA86A –MARCH 2010–REVISED DECEMBER 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
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Switching frequency range using RT mode 100 2500 kHz
f
SW
Switching frequency R
T
= 200 kΩ 450 581 720 kHz
Switching frequency range using CLK mode 300 2200 kHz
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 edge delay Measured at 500 kHz with RT resistor in series 60 ns
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 1.15 V
SS/TR discharge current (overload) VSENSE = 0 V, V(SS/TR) = 0.4 V 382 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
4 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54260