CS51413EDR8G ON Semiconductor, CS51413EDR8G Datasheet - Page 14

• Manufacturer Part Number: CS51413EDR8G
• Description: IC REG BUCK LV 1.5A SYNC 8SOIC
• Manufacturer: ON Semiconductor
• Type: Step-Down (Buck)r

Specifications of CS51413EDR8G

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Current - Output: 1.5A
• Frequency - Switching: 520kHz
• Voltage - Input: 4.5 ~ 40 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Mounting Style: SMD/SMT
• Primary Input Voltage: 40V
• No. Of Outputs: 1
• Output Current: 1.5A
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Current Rating: 1.5A
• Filter Terminals: SMD
• Input Voltage Primary Max: 40V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: CS51413EDR8GOS

physically large, and not used in applications where the size,
and especially height is the major concern.
Since the ceramic capacitor has low ESR and ESL, a single
ceramic capacitor can be adequate for both low frequency
and high frequency noises. The disadvantage of ceramic
capacitors are their high cost. Solid tantalum capacitors can
have low ESR and small size. However, the reliability of the
tantalum capacitor is always a concern in the application
where the capacitor may experience surge current.
Output Capacitor
capacitor are not as critical as those on the input capacitor.
The current to the output capacitor comes from the inductor
and thus is triangular. In most applications, this makes the
RMS ripple current not an issue in selecting output
capacitors.
caused by ripple current flowing through ESR, and a square
wave due to ESL. Capacitive reactance is assumed to be
small compared to ESR and ESL. The peak−to−peak ripple
current of the inductor is:
to the product of I
across the ESL is proportional to the di/dt of the output
capacitor. It is realized that the di/dt of the output capacitor
is the same as the di/dt of the inductor current. Therefore,
when the switch turns on, the di/dt is equal to (V
and it becomes V
ripple voltage induced by ESL can then be derived from
V
Figure 21. The Output Voltage Ripple Using Two 10 mF
RIPPLE(ESR)
Ceramic capacitors are now available in values over 10 mF.
In a buck converter, the requirements on the output
The output ripple voltage is the sum of a triangular wave
V
The total output ripple is the sum of the V
V RIPPLE(ESL) + ESL(
RIPPLE(ESR)
Ceramic Capacitors in Parallel
.
, the output ripple due to the ESR, is equal
I P * P +
O
/L when the switch turns off. The total
P−P
V IN
and ESR. The voltage developed
L
) ) ESL(
V O (V IN * V O )
(V IN )(L)(f S )
V IN * V O
L
RIPPLE(ESR)
) + ESL(
IN
− V
http://onsemi.com
V IN
L
O
)/L,
and
)
14
Figure 22. The Output Voltage Ripple Using One 100 mF
Figure 23. The Output Voltage Ripple Using
Figure 24. The Output Voltage Ripple Using
One 100 mF Tantalum Capacitor
One 100 mF OS−CON
POSCAP Capacitor