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参数资料
| 型号： | S-8520E35MC-BJU-T2 |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 375 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | SOT-23, 5 PIN |
| 文件页数： | 1/43页 |
| 文件大小： | 499K |
| 代理商： | S-8520E35MC-BJU-T2 |
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Rev.7.4_20
PWM CONTROL, PWM/PFM SWITCHING CONTROL
STEP-DOWN SWITCHING REGULATOR CONTROLLERS S-8520/8521 Series
Seiko Instruments Inc.
1
The S-8520/8521 Series consists of CMOS step-down
switching regulator-controllers with PWM control (S-8520
Series) and PWM/PFM switching control (S-8521 Series).
These devices contain a reference voltage source,
oscillation circuit, error amplifier, and other components.
The S-8520 Series provides low-ripple power, high-
efficiency, and excellent transient characteristics thanks to
a PWM control circuit capable of varying the duty ratio
linearly from 0 % up to 100 %. The series also contains
an error amplifier circuit as well as a soft-start circuit that
prevents overshoot at startup.
The S-8521 Series works with either PWM control or PFM
control, and can switch from one to the other. It normally
operates using PWM control with a duty ratio of 25 % to
100 %, but under a light load, it automatically switches to
PFM control with a duty ratio of 25 %.
This series
ensures high efficiency over a wide range of conditions,
from standby mode to operation of peripheral equipment.
With the addition of an external Pch power MOS FET or
PNP transistor, a coil, capacitors, and a diode connected
externally, these ICs can function as step-down switching
regulators. They serve as ideal power supply units for
portable devices when coupled with the SOT-23-5 small
package, providing such outstanding features as low
current
consumption.
Since
this
series
can
accommodate an input voltage of up to 16 V, it is also
ideal when operating via an AC adapter.
Features
Low current consumption
During operation: 60
A max.
(A, B types)
21
A max.
(C, D types)
100
A max. (E, F types)
During shutdown: 0.5
A max.
Input voltage:
2.5 V to 16 V (B, D, F types)
2.5 V to 10 V (A, C, E types)
Output voltage:
Selectable between 1.5 V and 6.0 V in 0.1 V step
Duty ratio:
0 % to 100 % PWM control (S-8520 Series)
25 % to 100 % PWM/PFM switching control (S-8521 Series)
The only peripheral components that can be used with this IC are a Pch power MOS FET or PNP
transistor, a coil, a diode, and capacitors (If a PNP transistor is used, a base resistance and a capacitor will
also be required).
Oscillation frequency:
180 kHz typ.
(A, B types)
60 kHz typ.
(C, D types)
300 kHz typ.
(E, F types)
Soft-start function:
8 ms. typ.
(A, B types)
12 ms. typ.
(C, D types)
4.5 ms. typ.
(E, F types)
With a shutdown function
With a built-in overload protection circuit
Overload detection time:
4 ms. typ. (A type)
14 ms. typ.
(C type)
2.6 ms. typ.
(E type)
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