BU28TD3WG datasheet, PDF - EEWORLD Datasheet

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BU28TD3WG: DescriptionFixed Positive LDO Regulator, 2.8V, 0.5V Dropout, CMOS, PDSO5, SSOP-5; CategoryPower/power management The power supply circuit; File Size144KB，5 Pages; ManufacturerROHM Semiconductor; Websitehttps://www.rohm.com/; Environmental Compliance

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BU28TD3WG Overview

Fixed Positive LDO Regulator, 2.8V, 0.5V Dropout, CMOS, PDSO5, SSOP-5

BU28TD3WG Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Parts packaging code	SSOP
package instruction	SSOP-5
Contacts	5
Reach Compliance Code	compliant
ECCN code	EAR99
Maximum drop-back voltage 1	0.5 V
Maximum input voltage	5.5 V
Minimum input voltage	1.7 V
JESD-30 code	R-PDSO-G5
length	2.9 mm
Number of functions	1
Number of terminals	5
Working temperatureTJ-Max	125 °C
Maximum output current 1	0.2 A
Maximum output voltage 1	2.828 V
Minimum output voltage 1	2.772 V
Nominal output voltage 1	2.8 V
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
Regulator type	FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
Maximum seat height	1.25 mm
surface mount	YES
technology	CMOS
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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1/4

STRUCTURE

PRODUCT

Silicon Monolithic Integrated Circuit

CMOS-type Series Regulator

NAME

ＢＵＸＸＴＤ３ＷＧ Series

○ PIN DESCRIPTION

PIN No.

VREF

○ BLOCK DIAGRAM and APPLICATION CIRCUIT

VIN

PIN NAME

VIN

GND

STBY

N.C.

VOUT

DESCRIPTION

INPUT Pin

GROUND Pin

OUTPUT CONTROL Pin (High: ON, Low: OFF)

Cin

GND

VOUT

OCP

NO CONNECT

OUTPUT Pin

TSD

VSTBY

STBY

CON

Discharge

N.C.

Cin½½½0.47μF (Ceramic)

Co ½½½0.47μF (Ceramic)

Fig.1 BLOCK DIAGRAM and APPLICATION CIRCUIT

○ ABSOLUTE MAXIMUM RATINGS (Ta=25℃)

PARAMETER

Power Supply Voltage

Power Dissipation

Maximum Junction Temperature

Operating Temperature Range

Storage Temperature Range

Symbol

VMAX

TjMAX

Topr

Tstg

Limit

-0.3 ½ +6.5

540 (*1)

+125

-40 ½ +85

-55 ½ +125

Unit

℃

(*1) Pd deleted at 5.4mW/℃ at temperatures above Ta=25℃, mounted on 70×70×1.6mm glass-epoxy PCB.

○ RECOMMENDED OPERATING RANGE (Not to exceed Pd)

PARAMETER

Power Supply Voltage

Maximum Output Current

Symbol

VIN

IMAX

Limit

1.7½5.5

200

Unit

REV. B

4/4

○ OPERATION NOTES

1.) Absolute maximum ratings

Use of the IC in excess of absolute maximum ratings (such as the input voltage or operating temperature range) may result in damage to the IC.

Assumptions should not be made regarding the state of the IC (e.g., short mode or open mode) when such damage is suffered. If operational

values are expected to exceed the maximum ratings for the device, consider adding protective circuitry (such as fuses) to eliminate the risk of

damaging the IC.

2.) GND potential

The potential of the GND pin must be the minimum potential in the system in all operating conditions. Never connect a potential lower than

GND to any pin, even if only transiently.

3.) Thermal design

Use a thermal design that allows for a sufficient margin for that package power dissipation rating (Pd) under actual operating conditions.

4.) Inter-pin shorts and mounting errors

Use caution when orienting and positioning the IC for mounting on printed circuit boards. Improper mounting or shorts between pins may result

in damage to the IC.

5.) Operation in strong electromagnetic fields

Strong electromagnetic fields may cause the IC to malfunction. Caution should be exercised in applications where strong electromagnetic

fields may be present.

6.) Common impedance

Wiring traces should be as short and wide as possible to minimize common impedance. Bypass capacitors should be use to keep ripple to a

minimum.

7.) Voltage of STBY pin

To enable standby mode for all channels, set the STBY pin to 0.3 V or less, and for normal operation, to 1.2 V or more. Setting STBY to a

voltage between 0.3 V and 1.2 V may cause malfunction and should be avoided. Keep transition time between high and low (or vice versa) to a

minimum.

Additionally, if STBY is shorted to VIN, the IC will switch to standby mode and disable the output discharge circuit, causing a temporary voltage

to remain on the output pin.

If the IC is switched on again while this voltage is present, overshoot may occur on the output. Therefore, in

applications where these pins are shorted, the output should always be completely discharged before turning the IC on.

8.) Over-current protection circuit (OCP)

This IC features an integrated over-current and short-protection circuitry on the output to prevent destruction of the IC when the output is

shorted. The OCP circuitry is designed only to protect the IC from irregular conditions (such as motor output shorts) and is not designed to be

used as an active security device for the application. Therefore, applications should not be designed under the assumption that this circuitry

will engage.

9.) Thermal shutdown circuit (TSD)

This IC also features a thermal shutdown circuit that is designed to turn the output off when the junction temperature of the IC exceeds. This

feature is intended to protect the IC only in the event of thermal overload and is not designed to guarantee operation or act as an active

security device for the application. Therefore, applications should not be designed under the assumption that this circuitry will engage.

10.) Input/output capacitor

Capacitors must be connected between the input/output pins and GND for stable operation,

and should be physically mounted as close to the IC pins as possible (refer to figure 4). The

input capacitor helps to counteract increases in power supply impedance, and increases

stability in applications with long or winding power supply traces. The output capacitance

value is directly related to the overall stability and transient response of the regulator, and

should be set to the largest possible value for the application to increase these

characteristics. During design, keep in mind that in general, ceramic capacitors have a wide

range of tolerances, temperature coefficients and DC bias characteristics, and that their

capacitance values tend to decrease over time. Confirm these details before choosing

appropriate capacitors for your application..

(Please refer the technical note, regarding ceramic capacitor of recommendation.)

ESR [Ω]

ESR　[Ω]

Cout=0.47μF, Cin=0.47μF, Temp=+25℃

100

Unstable region

Stable region

0.1

0.01

100

IOUT

[mA]

IOUT

[mA]

150

200

Fig.4 Stable region (example)

REV. B

Notice

Notes

No copying or reproduction of this document, in part or in whole, is permitted without the

consent of ROHM Co.,Ltd.

The content specified herein is subject to change for improvement without notice.

The content specified herein is for the purpose of introducing ROHM's products (hereinafter

"Products"). If you wish to use any such Product, please be sure to refer to the specifications,

which can be obtained from ROHM upon request.

Examples of application circuits, circuit constants and any other information contained herein

illustrate the standard usage and operations of the Products. The peripheral conditions must

be taken into account when designing circuits for mass production.

Great care was taken in ensuring the accuracy of the information specified in this document.

However, should you incur any damage arising from any inaccuracy or misprint of such

information, ROHM shall bear no responsibility for such damage.

The technical information specified herein is intended only to show the typical functions of and

examples of application circuits for the Products. ROHM does not grant you, explicitly or

implicitly, any license to use or exercise intellectual property or other rights held by ROHM and

other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the

use of such technical information.

The Products specified in this document are intended to be used with general-use electronic

equipment or devices (such as audio visual equipment, office-automation equipment, commu-

nication devices, electronic appliances and amusement devices).

The Products specified in this document are not designed to be radiation tolerant.

While ROHM always makes efforts to enhance the quality and reliability of its Products, a

Product may fail or malfunction for a variety of reasons.

Please be sure to implement in your equipment using the Products safety measures to guard

against the possibility of physical injury, fire or any other damage caused in the event of the

failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM

shall bear no responsibility whatsoever for your use of any Product outside of the prescribed

scope or not in accordance with the instruction manual.

The Products are not designed or manufactured to be used with any equipment, device or

system which requires an extremely high level of reliability the failure or malfunction of which

may result in a direct threat to human life or create a risk of human injury (such as a medical

instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-

controller or other safety device). ROHM shall bear no responsibility in any way for use of any

of the Products for the above special purposes. If a Product is intended to be used for any

such special purpose, please contact a ROHM sales representative before purchasing.

If you intend to export or ship overseas any Product or technology specified herein that may

be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to

obtain a license or permit under the Law.

Thank you for your accessing to ROHM product informations.

More detail product informations and catalogs are available, please contact us.

ROHM Customer Support System

http://www.rohm.com/contact/

www.rohm.com

R1010A

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