Datasheet
TPS54320
www.ti.com
SLVS982A –AUGUST 2010–REVISED SEPTEMBER 2010
THERMAL INFORMATION
TPS54320
THERMAL METRIC
(1)(2)
QFN UNITS
14 PINS
q
JA
Junction-to-ambient thermal resistance 47.2
q
JA
Junction-to-ambient thermal resistance
(3)
32
q
JCtop
Junction-to-case (top) thermal resistance 64.8
q
JB
Junction-to-board thermal resistance 14.4 °C/W
y
JT
Junction-to-top characterization parameter 0.5
y
JB
Junction-to-board characterization parameter 14.7
q
JCbot
Junction-to-case (bottom) thermal resistance 3.2
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
(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
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 mA
VIN operating – non switching supply current VSENSE = 810 mV 600 800 mA
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 mA
Hysteresis current EN = 1.3 V 3.4 mA
VOLTAGE REFERENCE
Voltage reference 0 A ≤ I
OUT
≤ 3 A 0.792 0.800 0.808 V
MOSFET
High-side switch resistance
(1)
BOOT-PH = 3 V 77 116 mΩ
High-side switch resistance
(1)
BOOT-PH = 6 V 57 103 mΩ
Low-side Switch Resistance
(1)
VIN = 12 V 50 87 mΩ
(1) Measured at pins
Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s) :TPS54320