Datasheet
TPS54528
www.ti.com
SLVSAY4C –JULY 2011–REVISED MARCH 2014
7.4 Thermal Information
TPS54528
THERMAL METRIC
(1)
UNIT
DDA (8)
θ
JA
Junction-to-ambient thermal resistance 43.5
θ
JCtop
Junction-to-case (top) thermal resistance 49.4
θ
JB
Junction-to-board thermal resistance 25.6
°C/W
ψ
JT
Junction-to-top characterization parameter 7.4
ψ
JB
Junction-to-board characterization parameter 25.5
θ
JCbot
Junction-to-case (bottom) thermal resistance 5.2
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
7.5 Electrical Characteristics
over operating free-air temperature range, V
IN
= 12 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
V
IN
current, T
A
= 25°C, EN = 5 V,
I
VIN
Operating - non-switching supply current 900 1200 μA
V
FB
= 0.8 V
I
VINSDN
Shutdown supply current V
IN
current, T
A
= 25°C, EN = 0 V 3.6 10 μA
LOGIC THRESHOLD
EN high-level input voltage EN 1.6 V
V
EN
EN low-level input voltage EN 0.6 V
V
FB
VOLTAGE AND DISCHARGE RESISTANCE
T
A
= 25°C, V
O
= 1.05 V, I
O
= 10 mA, Eco-
771 mV
mode™ operation
T
A
= 25°C, V
O
= 1.05 V, continuous mode
V
FBTH
V
FB
threshold voltage 757 765 773 mV
operation
T
A
= -40 to 85°C, V
O
= 1.05 V, continuous
751 765 779 mV
mode operation
(1)
I
VFB
V
FB
input current V
FB
= 0.8 V, T
A
= 25°C 0 ±0.15 μA
V
REG5
OUTPUT
T
A
= 25°C, 6.0 V < V
IN
< 18 V,
V
VREG5
V
REG5
output voltage 5.2 5.5 5.7 V
0 < I
VREG5
< 5 mA
V
LN5
Line regulation 6 V < V
IN
< 18 V, I
VREG5
= 5 mA 25 mV
V
LD5
Load regulation 0 mA < I
VREG5
< 5 mA 100 mV
I
VREG5
Output current V
IN
= 6 V, V
REG5
= 4.0 V, T
A
= 25°C 60 mA
MOSFET
High side switch resistance 25°C, V
BST
- SW = 5.5 V 65 mΩ
R
DS(on)
Low side switch resistance 25°C 36 mΩ
CURRENT LIMIT
I
ocl
Current limit L out = 1.5 μH
(1)
5.6 6.4 7.9 A
THERMAL SHUTDOWN
Shutdown temperature
(1)
165
T
SDN
Thermal shutdown threshold °C
Hysteresis
(1)
35
(1) Not production tested.
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