Datasheet

TPS54620
www.ti.com SLVS949C –MAY 2009– REVISED MAY 2011
PACKAGE DISSIPATION RATINGS
(1) (2) (3)(4)
THERMAL IMPEDANCE θ
JP
THERMAL IMPEDANCE ψ
JT
THERMAL CHARACTERISTIC
PACKAGE JUNCTION TO AMBIENT JUNCTION TO EXPOSED JUNCTION TO TOP
THERMAL PAD
RHL/RGY 32°C/W 5.2°C/W 5°C/W
(1) Maximum power dissipation may be limited by overcurrent protection
(2) Power rating at a specific ambient temperature T
A
should be determined with a junction temperature of 150°C. This is the point where
distortion starts to substantially increase. Thermal management of the PCB should strive to keep the junction temperature at or below
150°C for best performance and long-term reliability. See power dissipation estimate in application section of this data sheet for more
information.
(3) Test board conditions:
(a) 2.5 inches × 2.5 inches, 4 layers, thickness: 0.062 inch
(b) 2 oz. copper traces located on the top of the PCB
(c) 2 oz. copper ground planes on the 2 internal layers and bottom layer
(d) 4 0.010 inch thermal vias located under the device package
(4) For information on thermal characteristics see SPRA953A
ELECTRICAL CHARACTERISTICS
T
J
= –40°C to 150°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
Input current EN = 1.1 V 1.15 μA
Hysteresis current EN = 1.3 V 3.4 μA
VOLTAGE REFERENCE
Voltage reference 0 A ≤ I
OUT
≤ 6 A 0.792 0.800 0.808 V
MOSFET
High-side switch resistance BOOT-PH = 3 V 32 60 mΩ
High-side switch resistance
(1)
BOOT-PH = 6 V 26 40 mΩ
Low-side Switch Resistance
(1)
VIN = 12 V 19 30 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 16 A/V
CURRENT LIMIT
High-side switch current limit threshold 8 11 A
Low-side switch sourcing current limit 7 10 A
Low-side switch sinking current limit 2.3 A
(1) Measured at pins
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