S-8521C27MC-BTM-T2 datasheet, PDF

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S-8521C27MC-BTM-T2: DescriptionSwitching Controller, 0.05A, 75kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN; CategoryPower/power management The power supply circuit; File Size506KB，35 Pages; ManufacturerABLIC

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S-8521C27MC-BTM-T2 Overview

Switching Controller, 0.05A, 75kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN

S-8521C27MC-BTM-T2 Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	ABLIC
Parts packaging code	SOT-23
package instruction	LSSOP,
Contacts	5
Reach Compliance Code	compliant
ECCN code	EAR99
Other features	CAN ALSO FUNCTION IN PFM MODE
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	10 V
Minimum input voltage	2.5 V
Nominal input voltage	3.24 V
JESD-30 code	R-PDSO-G5
length	2.9 mm
Number of functions	1
Number of terminals	5
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output current	0.05 A
Package body material	PLASTIC/EPOXY
encapsulated code	LSSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
Maximum seat height	1.3 mm
surface mount	YES
Switch configuration	SINGLE
Maximum switching frequency	75 kHz
technology	CMOS
Temperature level	INDUSTRIAL
Terminal form	GULL WING
Terminal pitch	0.95 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	1.6 mm

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Rev.7.4

_10

PWM Control & PWM/PFM Control

Step-Down Switching Regulator-Controllers

S-8520/8521 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.

Features:

Applications:

•

On-board power supplies of battery devices for

•

Low current consumption:

portable telephones, electronic notebooks, PDAs,

In operation: 60

µA

max. (A & B Series)

and the like.

µA

max. (C & D Series)

•

Power supplies for audio equipment, including

100

µA

max. (E & F Series)

portable CD players and headphone stereo

When powered off: 0.5

µA

max.

equipment.

•

Input voltage:

•

Fixed voltage power supply for cameras, video

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

equipment and communications equipment.

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

•

Power supplies for microcomputers.

•

Output voltage:

•

Conversion from four NiH or NiCd cells or two

Selectable between 1.5 V and

lithium-ion cells to 3.3 V/3 V.

6.0 V in 0.1 V step

•

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

•

Duty ratio:

to 100

PWM control (S-8520)

to 100

PWM/PFM-switched control (S-8521)

•

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 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

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

Seiko Instruments Inc.

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