Datasheet

TPS54521
SLVS981C –JUNE 2010–REVISED AUGUST 2013 www.ti.com
ELECTRICAL CHARACTERISTICS
T
J
= –40°C to 125°C, VIN = 4.5V to 17V, PVIN = 1.6V to 17V (unless otherwise noted)
DESCRIPTION CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE (VIN AND PVIN PINS)
PVIN operating input voltage 1.6 17 V
VIN operating input voltage 4.5 17 V
VIN internal UVLO threshold VIN rising 4.0 4.5 V
VIN internal UVLO hysteresis 150 mV
VIN shutdown supply Current EN = 0 V 2 5 μA
VIN operating – non switching supply current VSENSE = 810 mV 600 800 μA
ENABLE AND UVLO (EN PIN)
Enable threshold Rising 1.21 1.26 V
Enable threshold Falling 1.10 1.17 V
Input current EN = 1.1 V 1.15 μA
Hysteresis current EN = 1.3 V 3.4 μA
VOLTAGE REFERENCE
Voltage reference 0 A ≤ Iout ≤ 5 A 0.776 0.800 0.824 V
MOSFET
High-side switch resistance
(1)
BOOT-PH = 3 V 74 105 mΩ
High-side switch resistance
(1)
BOOT-PH = 6 V 57 95 mΩ
Low-side Switch Resistance
(1)
VIN = 12 V 50 82 mΩ
ERROR AMPLIFIER
Error amplifier Transconductance (gm) –2 μA < I
COMP
< 2 μA, V
(COMP)
= 1 V 1300 μMhos
Error amplifier dc gain VSENSE = 0.8 V 1000 3100 V/V
Error amplifier source/sink V
(COMP)
= 1 V, 100 mV input overdrive ±110 μA
Start switching threshold 0.25 V
COMP to Iswitch gm 12 A/V
CURRENT LIMIT
High-side switch current limit threshold 7 9 A
Low-side switch sourcing current limit 6 8 A
Low-side switch sinking current limit 1 2.6 A
Hiccup wait time before triggering hiccup 512 cycles
Hiccup time before restart 16384 cycles
(1) Measured at pins
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