S-8520D50MC-BWJ-T2 Seiko Instruments, S-8520D50MC-BWJ-T2 Datasheet - Page 16

• Manufacturer Part Number: S-8520D50MC-BWJ-T2
• Description: DC/DC Switching Regulators 5.0V Step-Down PWM
• Manufacturer: Seiko Instruments

Specifications of S-8520D50MC-BWJ-T2

• Output Voltage: 5 V
• Mounting Style: SMD/SMT
• Package / Case: SOT-23-5
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
S-8520/8521 Series
16
On the other hand, a reactive current flows through external resistances R
must be reduced to a negligible value with respect to the load current in the actual use of the IC so that
the efficiency characteristics will not be degraded. This requires that the value of external resistance R
and R
However, too large a value (more than 1 MΩ) for the external resistances R
vulnerable to external noise. Check the influence of this value on actual equipment.
There is a tradeoff between the voltage accuracy of the output OUT and the reactive current. This should
be taken into consideration based on the requirements of the intended application.
Deviations in the absolute value of internal resistances R
the S-8520/21 Series, and are broadly classified as follows:
When a value of R
the output OUT, a median voltage deviation will be obtained for the output OUT.
R
minimum deviation in absolute value of internal resistances R
Moreover, add a capacitor C
and other types of instability (See Figure 11).
Make sure that C
If a large C
1
+ R
SII is equipped with a tool that allows you to automatically calculate the necessary resistance values
of R
customers in determining the R
Moreover, SII also has ample information on which peripheral components are suitable for use with
this IC and data concerning the deviations in the IC's characteristics. We are ready to help our
customers with the design of application circuits.
Please contact the SII Components Sales Dept.
B
2
Output voltage 1.5 V to 2.0 V → 5.16 MΩ to 28.9 MΩ
Output voltage 2.1 V to 2.5 V → 4.44 MΩ to 27.0 MΩ
Output voltage 2.6 V to 3.3 V → 3.60 MΩ to 23.3 MΩ
Output voltage 3.4 V to 4.9 V → 2.44 MΩ to 19.5 MΩ
Output voltage 5.0 V to 6.0 V → 2.45 MΩ to 15.6 MΩ
A
be made sufficiently large.
C
= 2 ÷ (1 ÷ maximum deviation in absolute value of internal resistances R
and R
C
C
(F) ≥ 1 ÷ (2 x π x R
-value is selected, a longer soft-start time than the one set up in the IC will be set.
B
from the required voltage accuracy of the output OUT. SII will be pleased to assist its
C
1
is larger than the value given by the following equation:
+R
2
given by the equation indicated below is taken in calculating the voltage value of
C
Seiko Instruments Inc.
in parallel to the external resistance R
A
(Ω) x 7.5 kHz)
A
and R
B
values. Should such assistance be desired, please inquire.
1
and R
1
and R
2
in the IC vary with the output voltage of
A
2
in order to avoid output oscillations
of IC)
A
and R
A
and R
B
. This reactive current
1
B
and R
would make the IC
Rev.7.4
2
in IC + 1 ÷
_10
A