Datasheet

TPS54418
www.ti.com SLVS946C –MAY 2009–REVISED JULY 2013
ELECTRICAL CHARACTERISTICS
T
J
= –40°C to 150°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 2.6 2.8 V
Shutdown supply current EN = 0 V, 25°C, 2.95 V ≤ VIN ≤ 6 V 2 5 μA
Quiescent Current - I
q
VSENSE = 0.9 V, VIN = 5 V, 25°C, RT = 400 kΩ 350 500 μA
ENABLE AND UVLO (EN PIN)
Enable threshold Rising 1.16 1.25 1.37 V
Falling 1.18
Enable threshold + 50 mV -3.2
Input current μA
Enable threshold – 50 mV -0.65
VOLTAGE REFERENCE (VSENSE PIN)
Voltage Reference 2.95 V ≤ VIN ≤ 6 V, –40°C <T
J
< 150°C 0.795 0.803 0.811 V
MOSFET
BOOT-PH= 5 V 30 60
High side switch resistance mΩ
BOOT-PH= 2.95 V 44 70
VIN = 5 V 30 60
Low side switch resistance mΩ
VIN = 2.95 V 44 70
ERROR AMPLIFIER
Input current 7 nA
Error amplifier transconductance (gm) –2 μA < I
(COMP)
< 2 μA, V
(COMP)
= 1 V 225 μmhos
Error amplifier transconductance (gm) during –2 μA < I
(COMP)
< 2 μA, V
(COMP)
= 1 V, 70 μmhos
slow start VSENSE = 0.4 V
Error amplifier source/sink V
(COMP)
= 1 V, 100 mV overdrive ±20 μA
COMP to Iswitch gm 13.0 A/V
CURRENT LIMIT
Current limit threshold Instantaneous peak current 5.0 6.4 A
THERMAL SHUTDOWN
Thermal Shutdown 175 °C
Hysteresis 15 °C
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Switching frequency range using RT mode 200 2000 kHz
Switching frequency Rt = 400 kΩ 400 500 600 kHz
Switching frequency range using CLK mode 300 2000 kHz
Minimum CLK pulse width 75 ns
RT/CLK voltage R(RT/CLK)= 400kΩ 0.5 V
RT/CLK high threshold 1.6 2.2 V
RT/CLK low threshold 0.4 0.6 V
RT/CLK falling edge to PH rising edge delay Measure at 500 kHz with RT resistor in series 90 ns
PLL lock in time Measure at 500 kHz 14 μs
PH (PH PIN)
Minimum On time Measured at 50% points on PH, I
OUT
= 4 A 60 ns
Measured at 50% points on PH, VIN = 5 V, I
OUT
= 0 A 110
Minimum Off time Prior to skipping off pulses, BOOT-PH = 2.95 V, 60 ns
I
OUT
= 4 A
Rise/Fall Time VIN = 5 V 1.5 V/ns
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