TPS54531 Datasheet, PDF (3/27 Pages) Texas Instruments – 5A, 28V INPUT, STEP DOWN SWIFT™ DC/DC CONVERTER WITH ECO-mode™

TPS54531
www.ti.com
SLVSBI5 – MAY 2013
PACKAGE DISSIPATION RATINGS^{(1) (2) (3)}
PACKAGE
THERMAL IMPEDANCE
JUNCTION TO AMBIENT
SOIC8 PowerPAD™
50°C/W
PSEUDO THERMAL IMPEDANCE
JUNCTION TO TOP
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 inches x 1.5 inches, 2 layers, thickness: 0.062 inch
(b) 2-ounce copper traces located on the top and bottom of the PCB
(c) 6 thermal vias located under the device package
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
Operating Input Voltage on (VIN pin)
Operating junction temperature, T_J
MIN TYP MAX UNIT
3.5
28 V
–40
150 °C
ELECTRICAL CHARACTERISTICS
T_J = –40°C to 150°C, VIN = 3.5V to 28V (unless otherwise noted)
DESCRIPTION
TEST CONDITIONS
SUPPLY VOLTAGE (VIN PIN)
Internal undervoltage lockout threshold
Rising and Falling
Shutdown supply current
EN = 0V, VIN = 12V, –40°C to 85°C
Operating – non switching supply current
VSENSE = 0.85 V
ENABLE AND UVLO (EN PIN)
Enable threshold
Rising and Falling
Input current
Enable threshold – 50 mV
Input current
Enable threshold + 50 mV
VOLTAGE REFERENCE
Voltage reference
HIGH-SIDE MOSFET
On resistance
BOOT-PH = 3 V, VIN = 3.5 V
BOOT-PH = 6 V, VIN = 12 V
ERROR AMPLIFIER
Error amplifier transconductance (gm)
Error amplifier DC gain⁽¹⁾
Error amplifier unity gain bandwidth⁽¹⁾
–2 μA < I_(COMP) < 2 μA, V_(COMP) = 1 V
VSENSE = 0.8 V
5 pF capacitance from COMP to GND pins
Error amplifier source/sink current
Switch current to COMP transconductance⁽¹⁾
V_(COMP) = 1 V, 100 mV overdrive
VIN = 12 V
SWITCHING FREQUENCY
Switching Frequency
VIN = 12V, 25°C
Minimum controllable on time
Maximum controllable duty ratio⁽¹⁾
VIN = 12V, 25°C
BOOT-PH = 6 V
PULSE SKIPPING ECO-MODE™
Pulse skipping Eco-mode™ switch current threshold
CURRENT LIMIT
Current limit threshold
VIN = 12 V
(1) Specified by design
MIN TYP MAX UNIT
3.5 V
1
4 μA
110 190 μA
1.25 1.35 V
-1
μA
-4
μA
0.772 0.8 0.828 V
115 200 mΩ
80 150
92
μmhos
800
V/V
2.7
MHz
±7
μA
20
A/V
456
90%
570
105
93%
684 kHz
130 ns
160
mA
6.3 10.5
A
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