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

S-8520D50MC-BWJ-T2

Manufacturer Part Number

S-8520D50MC-BWJ-T2

Description

DC/DC Switching Regulators 5.0V Step-Down PWM

Manufacturer

Seiko Instruments

Datasheet

1.S-8520D50MC-BWJ-T2.pdf (35 pages)

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

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Rev.7.4

PWM Control & PWM/PFM Control

Step-Down Switching Regulator-Controllers

• Low current consumption:

• Input voltage:

• Output voltage:

• Duty ratio:

• The only peripheral components that can be used with this IC are a Pch power MOS FET or PNP transistor,

• Oscillation frequency: 180 kHz typ. (A & B Series), 60 kHz typ. (C & D Series), or 300 kHz typ. (E, F Series).

• Soft-start function: 8 ms. typ. (A & B Series) 12 ms. typ.(C & D Series), or 4.5 ms. typ. (E, F Series).

• With a power-off function.

• With a built-in overload protection circuit. Overload detection time: 4 ms. typ. (A Series), 14 ms. typ. (C

Features:

a coil, a diode, and capacitors (If a PNP transistor is used, a base resistance and a capacitor will also be

required).

Series) or 2.6 ms. typ.(E Series).

In operation:

When powered off: 0.5 µA max.

Selectable between 1.5 V and

0 % to 100 % PWM control (S-8520)

25 % to 100 % PWM/PFM-switched control (S-8521)

_10

2.5 V to 16 V (B, D, F Series)

2.5 V to 10 V (A, C, E Series)

100 µA max. (E & F Series)

6.0 V in 0.1 V step

60 µA max. (A & B Series)

21 µA max. (C & D Series)

The S-8520/8521 Series consists of CMOS step-down switching regulator-

controllers with PWM-control (S-8520) and PWM/PFM-switched control (S-

8521). 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 minipackage, 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.

Seiko Instruments Inc.

• On-board power supplies of battery devices for

• Power supplies for audio equipment, including

• Fixed voltage power supply for cameras, video

• Power supplies for microcomputers.

• Conversion from four NiH or NiCd cells or two

• Conversion of AC adapter input to 5 V/3 V.

Applications:

portable telephones, electronic notebooks, PDAs,

and the like.

portable

equipment.

equipment and communications equipment.

lithium-ion cells to 3.3 V/3 V.

players

S-8520/8521 Series

and

headphone

stereo

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