S-8521E36MC-BLV-T2 datasheet, PDF

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S-8521E36MC-BLV-T2: DescriptionSwitching Controller, 0.05A, 375kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN; CategoryPower/power management The power supply circuit; File Size499KB，43 Pages; ManufacturerABLIC

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S-8521E36MC-BLV-T2 Overview

Switching Controller, 0.05A, 375kHz Switching Freq-Max, CMOS, PDSO5, SOT-23, 5 PIN

S-8521E36MC-BLV-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	4.32 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	375 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
Base Number Matches	1

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Rev.7.4

_20

PWM CONTROL, PWM/PFM SWITCHING 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

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

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 % 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)

Seiko Instruments Inc.

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