S-8521C32MC-BTRT2G datasheet, PDF

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S-8521C32MC-BTRT2G: Descriptionswitching controllers 3.2V step-Dn pwm/pfm; Categorysemiconductor Other integrated circuit (IC); File Size542KB，45 Pages; ManufacturerSeiko; Environmental Compliance

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S-8521C32MC-BTRT2G Overview

switching controllers 3.2V step-Dn pwm/pfm

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S-8520/8521 Series

www.sii-ic.com

STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE

SWITCHING REGULATOR CONTROLLER

Rev.9.0

_00

The S-8520/8521 Series is a CMOS step-down switching regulator-controller with PWM control (S-8520 Series) and PWM

/ PFM switching control (S-8521 Series). The S-8520/8521 Series has a reference voltage source, an oscillation circuit, an

error amplifier, and other components.

The S-8520 Series provides low-ripple power, high efficiency, and excellent transient characteristics due to a PWM control

circuit capable of varying the duty ratio linearly from 0% up to 100%. The S-8520/8521 Series also has a soft-start circuit

that prevents overshoot at startup.

The S-8521 Series works with either PWM control or PFM control. 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%. The S-8520/8521

Series ensures high efficiency over a wide range of conditions for devices, from the standby mode to the operation.

By adding external Pch power MOS FET or PNP transistor, coil, capacitor, and externally connected diode, the

S-8520/8521 Series can function as a step-down switching regulator, and is ideal for power supply units of portable

devices due to small SOT-23-5 and the feature of low current consumption. It is also ideal for AC adapters due to the input

voltage up to 16 V.

Features

•

Low current consumption

μA

max. (A, B types)

μA

max. (C, D types)

100

μA

max. (E, F types)

During shutdown: 0.5

μA

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% to100% PWM / PFM switching control (S-8521 Series)

External parts are Pch power MOS FET or PNP transistor, coil, diode, and capacitor only

(When using PNP transistor, add base resistor and capacitor).

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)

Lead-free, Sn 100%, halogen-free

During operation:

Product Name Structure”

for details.

•

*1.

Refer to “

Seiko Instruments Inc.

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