Datasheet

TPS57040-Q1
SLVSAP4C –DECEMBER 2010–REVISED OCTOBER 2012 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
T
J
= –40°C to 150°C, VIN = 3.5 to 42V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
CURRENT LIMIT
Current limit threshold V
IN
= 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 using RT mode V
IN
= 12 V 100 2500 kHz
f
SW
Switching frequency V
IN
= 12 V, R
T
= 200 kΩ 450 581 720 kHz
Switching frequency using CLK mode V
IN
= 12 V 300 2200 kHz
Minimum CLK input pulse width 40 ns
RT/CLK high threshold V
IN
= 12 V 1.9 2.2 V
RT/CLK low threshold V
IN
= 12 V 0.45 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 μs
SLOW START AND TRACKING (SS/TR)
Charge current V
SS/TR
= 0.4 V 2 μA
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
SENSE
= 0 V, V(SS/TR) = 0.4 V 112 μA
SS/TR discharge voltage V
SENSE
= 0 V 54 mV
POWER-GOOD (PWRGD PIN)
V
SENSE
falling (Fault) 92
V
SENSE
rising (Good) 94
V
VSENSE
VSENSE threshold
V
SENSE
rising (Fault) 109 %
V
SENSE
falling (Good) 107
Hysteresis V
SENSE
falling 2
Output high leakage V
SENSE
= V
REF
, V
(PWRGD)
= 5.5 V, 25°C 10 nA
On resistance I
(PWRGD)
= 3 mA, V
SENSE
< 0.79 V 50 Ω
Minimum VIN for defined output V
(PWRGD)
< 0.5 V, I
I(PWRGD)
= 100 μA 0.95 1.5 V
4 Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated
Product Folder Links: TPS57040-Q1