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TPS652510 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
TPS652510 4.5-V TO 16-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN THREE DC-DC CONVERTERS WITH INTEGRATED FET TI
Texas Instruments TI
TPS652510 Datasheet PDF : 31 Pages
First Prev 21 22 23 24 25 26 27 28 29 30
TPS652510
SLVSB30B – SEPTEMBER 2011 – REVISED AUGUST 2013
www.ti.com
1.6
1.6
1.4
1.4
1.2
1.2
1
1
0.8
0.8
0.6
0.6
0.4
0.2
1
1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6
Current - A
Buck1 Vin = 12 V, fsw = 500 kHz,
Vo (from top to bottom) = 5, 3.3, 2.5, 1.8, 1.2 V
0.4
0.2
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6
Current - A
Buck1 Vin = 12 V, fsw = 1.1 MHz,
Vo (from top to bottom) = 5, 3.3, 2.5, 1.8, 1.2 V
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
Current - A
Buck2&3 Vin = 12 V, fsw = 500 kHz,
Vo (from top to bottom) = 5, 3.3, 2.5, 1.8, 1.2 V
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
Current - A
Buck2&3 Vin = 12 V, fsw = 1.1 MHz,
Vo (from top to bottom) = 5, 3.3, 2.5, 1.8, 1.2 V
Figure 40. Power Dissipation Curves
4. To calculate the maximum temperature inside the IC use the following formula:
THOT_SPOT = TA + PDIS x ѲJA
(11)
Where:
TA is the ambient temperature
PDIS is the sum of losses in all converters
ѲJA is the junction to ambient thermal impedance of the device and it is heavily dependant on board layout
Thermal Shutdown
The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds 160°C.
The thermal shutdown forces the device to stop switching when the junction temperature exceeds thermal trip
threshold. Once the die temperature decreases below 140°C, the device reinitiates the power up sequence. The
thermal shutdown hysteresis is 20°C.
3.3-V and 6.5 LDO Regulators
The following ceramic capacitor (X7R/X5R) should be connected as close as possible to the described pins:
• 4.7 µF to 10 µF for V7V pin 28
• 3.3 µF to 10 µF for V3V pin 29
22
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