Datasheet

TPS54519
www.ti.com SLVSAT3A –SEPTEMBER 2011–REVISED DECEMBER 2013
ELECTRICAL CHARACTERISTICS
T
J
= –40°C to 140°C, VIN = 2.95 to 6 V (unless otherwise noted)
DESCRIPTION CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE (VIN PIN)
Operating input voltage 2.95 6 V
Internal under voltage lockout threshold No voltage hysteresis, rising and falling 2.4 2.8 V
Shutdown supply current EN = 0 V, 25°C, 2.95 V ≤ VIN ≤ 6 V 1 5 μA
Quiescent Current - I
q
VSENSE = 0.9 V, 25°C, RT = 400 kΩ 455 500 μA
ENABLE AND UVLO (EN PIN)
Rising 1.16 1.25 1.37 V
Enable threshold
Falling 1.18
Enable threshold + 50 mV -3.6
Input current μA
Enable threshold – 50 mV -0.7
VOLTAGE REFERENCE (VSENSE PIN)
Voltage Reference 0 A ≤ I
OUT
≤ 5 A, 25°C 0.594 0.600 0.606 V
MOSFET
BOOT-PH= 5 V 30 60
High side switch resistance mΩ
BOOT-PH= 2.95 V 35 70
VIN= 5 V 30 60
Low side switch resistance mΩ
VIN= 2.95 V 35 70
ERROR AMPLIFIER
Input current 50 nA
Error amplifier transconductance (gm) –2 μA < I(COMP) < 2 μA, V(COMP) = 1 V 250 μmhos
Error amplifier transconductance (gm) during –2 μA < I(COMP) < 2 μA, V(COMP) = 1 V, 85 μmhos
slow start Vsense = 0.4 V
Error amplifier source/sink V(COMP) = 1 V, 100 mV overdrive ±20 μA
COMP to Iswitch gm 19.0 A/V
CURRENT LIMIT
Current limit threshold 6.0 7.0 8.0 A
Low-side reverse current limit –2.7 A
THERMAL SHUTDOWN
Thermal Shutdown 150 155 °C
Hysteresis 7.5 °C
TIMING RESISTOR (RT PIN)
Switching frequency range using RT mode 200 2000 kHz
Switching frequency Rt = 84 kΩ 400 490 600 kHz
PH (PH PIN)
Measured at 50% points on PH, VIN = 5 V, IOUT = 100 ns
Minimum On time
500 mA
Prior to skipping off pulses, BOOT-PH = 2.95 V, 60 ns
Minimum Off time
IOUT = 4 A
Rise/Fall Time VIN = 5 V 1.5 V/ns
Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: TPS54519