TPS5450-EP Datasheet, PDF (3/24 Pages) Texas Instruments – 5-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ CONVERTER

TPS5450-EP
www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009
DISSIPATION RATINGS^{(1) (2)}
PACKAGE
8-Pin DDA (4-layer board with solder)⁽³⁾
THERMAL IMPEDANCE
JUNCTION-TO-AMBIENT
30°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 125°C. This is the point where
distortion starts to substantially increase. Thermal management of the final PCB should strive to keep the junction temperature at or
below 125°C for best performance and long-term reliability. See Thermal Calculations in applications section of this data sheet for more
information.
(3) Test board conditions:
a. 2 in x 1.85 in, 4 layers, 0.062-in (1,57-mm) thickness
b. 2-oz copper traces located on the top and bottom of the PCB
c. 2-oz copper ground planes on the two internal layers
d. Four thermal vias in the PowerPAD area under the device package
RECOMMENDED OPERATING CONDITIONS
V_I
Input voltage range
T_J
Operating junction temperature
MIN MAX UNIT
5.5
36 V
–55 125 °C
ELECTRICAL CHARACTERISTICS
T_J = –55°C to 125°C, VIN = 5.5 V to 36 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
SUPPLY VOLTAGE (VIN PIN)
I_Q
Quiescent current
VSENSE = 2 V, Not switching, PH pin open
Shutdown, ENA = 0 V
UNDERVOLTAGE LOCK OUT (UVLO)
Start threshold voltage, UVLO
Hysteresis voltage, UVLO
VOLTAGE REFERENCE
Voltage reference accuracy
OSCILLATOR
T_J = 25°C
I_O = 0 A – 5 A; T_J = Full Range
Internally set free-running frequency
Minimum controllable on time
T_J = 25°C
T_J = Full Range
Maximum duty cycle
ENABLE (ENA PIN)
Start threshold voltage, ENA
Stop threshold voltage, ENA
Hysteresis voltage, ENA
Internal slow-start time (0~100%)
CURRENT LIMIT
Current limit
Current limit hiccup time
THERMAL SHUTDOWN
T_J = 25°C
T_J = Full Range
T_J = 25°C
T_J = Full Range
Thermal shutdown trip point
Thermal shutdown hysteresis
MIN TYP MAX UNIT
3 4.4 mA
18
60 µA
5.3
V
330
mV
1.202 1.221 1.239
V
1.193 1.221 1.245
400 500 600 kHz
375 500 600
150 220 ns
87
89
%
0.5
450
5.4
8
1.3 V
V
mV
10 ms
6.0 7.5 9.0 A
4.4 7.5 11.7
13
16
20 ms
13
16 22.5
135 162
°C
14
°C
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS5450-EP
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