A5975ADTR STMicroelectronics, A5975ADTR Datasheet - Page 30

• Manufacturer Part Number: A5975ADTR
• Description: IC REG SW STEP-DOWN 2.5A 8SOIC
• Manufacturer: STMicroelectronics
• Series: -r
• Type: Step-Down (Buck), PWMr

Specifications of A5975ADTR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.235 V ~ 35 V
• Current - Output: 2.5A
• Frequency - Switching: 500kHz
• Voltage - Input: 4 V ~ 36 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width) Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11425-2

Application information
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Figure 15. Power losses estimation (V
The red trace represents the maximum power which can be taken away, as calculated
above, whilst the other traces are the total internal losses for different output voltage.
The embedded conduction losses are proportional to the duty cycle required for the
conversion. Assuming the input voltage constant, the switching losses are proportional to
the output current while the quiescent losses can be considered as constant.
As a consequence, in
system can manage a continuous output current up to 2.4 A. The device could deliver a
continuous output current up to 2.5 A to the load, however, the maximum power loss of 2.5
W is reached with an output current of 2.4 A, so the maximum output power is derated.
Figure 16
Figure 16. Power losses estimation (V
plots the power losses for V
Figure
15, the maximum power loss is for V
Doc ID 018761 Rev 1
IN
=12 V and the main output rails.
IN
IN
= 5 V, f
= 12 V, f
SW
SW
= 500 kHz)
= 500 kHz)
OUT
=3.3 V, where the
A5975AD