B1117M-2.5 [ETC]

1.0Amp Low Dropout Voltage Regulator; 1.0Amp低压差稳压器


型号：	B1117M-2.5
厂家：	ETC
描述：	1.0Amp Low Dropout Voltage Regulator 1.0Amp低压差稳压器稳压器
文件：	总7页 (文件大小：348K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Bay Linear

Inspire the Linear Power

1.0Amp Low Dropout Voltage Regulator

B1117

Adjustable & Fix (0.40Volt Dropout)

Description

Features

•

Adjustable Output Down to 1.2V

The Bay Linear B1117 is a three terminal positive NPN

regulator offered as adjustable or fix voltages of 1.5V,1.8V,

2.5V, 2.85V, 3.3V, and 5Volts. The output current has a

capability up to 1.0Amp,. This device has been optimized for

low voltage where transient response and minimum input

voltage are critical. The 2.85V version is designed specifically

to be used in active terminators for SCSI bus.

Output Current of 1.0Amp

Low Dropout 1.0V for B1117

Dropout of 0.40 V in for B1117A

Adjustable & Fix 1.5V, 1.8V, 2.5V, 2.85V,

3.0V, 3.3V, 5.0V

•

0.05% Load Regulation

Current & Thermal Limiting

Lower Cost SOT-89 Package

Available in SOT-223, and TO-252,

TO-263 & SO-8

Current limit is trimmed to ensure specified output current and

controlled short-circuit current. On-Chip thermal limiting

provides protection against any combination of overload and

ambient temperatures that would create excessive junction

temperatures.

•

Similar to industry Standard LT1117

The B1117 is offered in a 3-pin SOT-223, and TO-252

(DPAK) packages compatible with other 3 terminal regulators.

5-pin version in TO-263 with lower dropout of 0.4 volt is

available.

Applications

•

Active SCSI terminators

High efficiency Linear Regulator

Post regulators fro Switching Supplies

Battery Charger

5V to 3.3V linear Regulators

Motherboard Clock Supplies

Pin Connection

Ordering Information

Devices

B1117D-X

B1117N-X

B1117T-X

B1117S-X

B1117M-X

Package

Temp.

TO-252

TO-223

TO-220

TO-263

SO-8

0 °C to 125 °C

SOT-223-5

Tab V_OUT

8-Pin Surface Mount

SOT-223

Tab V_OUT

ADJ

#1 Sense

#2 Adj/GND

#3 OUT

#4 Control

#5 V_IN

TO-252

OUT

V_POWER

V_CONTROL

OUTPUT

ADJ/GND.

N.C.

Adj/GND OUT

Front View

Top View

Front View

SENSE

TO-263-5 Package

ADJ/GN V_OUTV_IN

Front

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556

www.baylinear.com

B1117

Absolute Maximum Rating

Parameter

Min

Max

7.0

125

150

300

Unit

°C

Maximum Input Voltage

Operating Junction Temperature Range

Storage Temperature Range

Lead Temperature (Soldering 10 Sec.)

-65

Electrical Characteristics

(V_IN= 7V; T_J=25°C I_O= 10mA to 1.0Amp, unless otherwise specified)

Parameter

Reference Voltage

Symbol

Conditions

MIN

TYP

1.250

MAX UNIT

V_O

1117-adj, I_OUT=10mA, V_IN-V_OUT=2V, T_J=25°C

1.5V≤(V_IN-V_OUT) ≤5.75V

1.238

1.225

-2%

1.262

1.275

+2%

0.2

10mA≤I_OUT≤I_{FULL LOAD}

Line Regulation (1)

Load Regulation (1)

Output Voltage

REG _(line)

0.005

(V_OUT+1.5)≤V_IN≤7V, I_OUT=10mA

REG _(LOAD)(V_in-V_out)=2V

0.05

0.5

10mA≤I_OUT≤I_{FULL LOAD}

T= 25 °C

1117-1.8 I_OUT=10mA, V_IN=3.8V, T_J=25°C

0≤I_OUT≤1.0Amp, 3.2V≤V_IN≤7V

V_O

1.782

1.80

1.818

1.746

1.80

1.854

2.475

2.50

2.525

1117-2.5 I_OUT=10mA, V_IN=4.5V, T_J=25°C

0≤I_OUT≤1.0Amp, 4.0V≤V_IN≤7V

1117-2.85 I_OUT=10mA, V_IN=4.85V, T_J=25°C

0≤I_OUT≤1.0Amp, 4.35V≤V_IN≤7V

1117-3.3 I_OUT=10mA, V_IN=5.0V, T_J=25°C

0≤I_OUT≤1.0Amp, 4.8V≤V_IN≤7V

2.450

2.50

2.550

2.820

2.85

2.880

2.790

2.85

2.910

3.267

3.30

3.333

3.235

3.30

3.365

4.950

5.00

5.050

1117-5.0 I_OUT=10mA, V_IN=6.0V, T_J=25°C

0≤I_OUT≤1.0Amp, 6.5V≤V_IN≤7V

4.900

5.00

5.100

Dropout Voltage

V_D

Control Input

V_POWER=V_OUT+0.8, I_LOAD=10mA

0.80

0.35

1.00

1.10

0.40

V_POWER=V_OUT+0.8, I_LOAD=1.0Amp,

Power Input

V_CONTROL=V_OUT-+2.5V, I_LOAD=1.0Amp,

(V_in-V_out)=2V

Dropout Voltage

Current Limit

V_D

I_S

1.0

1.1

Minimum Load Current

Temperature Regulation

Long Term Stability

Temperature Stability

Adjust pin Current

I_{MIN LOAD}

%/W

µA

1.5V≤(V_IN-V_OUT) ≤5.75V

T= 25 °C, 30ms pulse

T= 25 °C, 1000Hrs

T_A

T_S

R_A

0.004

0.03

0.5

0.02

1.0

120

T= 25 °C

Ripple Rejection

F=120Hz, C_ADJ=22µF, C_OUT=22µF Tantalum

_OUT=I_{FULL LOAD}, (V_in-V_out)=3V (Note 5)

Thermal Shutdown

155

°C

Thermal Shutdown

Hysterics

Thermal Resistance

Junction to case

SOT-223

°C/W

DD Package

3.0

Note: Output Switch tests are performed under pulsed conditions to minimize power dissipation

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556

www.baylinear.com

B1117

TYPICAL CHRACTRISTICS

B1117-2.85

B1117-ADJ

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556

www.baylinear.com

B1117

TYPICAL CHRACTRISTICS (Continued)

B1117-2.85

B1117-5.0

B1117-2.85

B1117-5.0 Line Transient Response

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556

www.baylinear.com

B1117

APPLICATION NOTES EXTERNAL

CAPACITOR

To ensure the stability of the B1117 an output capacitor of at

least 10µF (tantalum)or 50µF (aluminum) is required. The

value may change based on the application requirements on

the output load or temperature range. The capacitor

equivalent series resistance (ESR) will effect the B1117

stability. The value of ESR can vary from the type of

capacitor used in the applications. The recommended value

for ESR is 0.5Ω. The output capacitance could increase in

size to above the minimum value. The larger value of

output capacitance as high as 100µF can improve the load

transient response.

Maximum Junction Temperature range:

T_J= T_ambient(max) + P_D* thermal resistance (Junction-to-

ambient)

Maximum Junction temperature must not exceed the

125°C.

10V

2.85V

SOLDERING METHODS

B1117-2.85

The B1117 SOT-223 package is designed to be compatible

with infrared reflow or vapor-phase reflow soldering

techniques. During soldering the non-active or mildly active

fluxes may be used. The B1117 die is attached to the heat

sink lead which exits opposite the input, output, and ground

pins.

27KΩ

10uF

Hand soldering and wave soldering should be avoided since

these methods can cause damage to the device with

excessive thermal gradients on the package. The SOT-223

recommended soldering method are as follows: vapor phase

reflow and infrared reflow with the component preheated to

within 65°C of the soldering temperature range.

P_O= (10V - 2.85)(105mA) = (7.15)(105mA) = 750mW

Fig. 1. Circuit Layout, Thermal Experiments.

THERMAL CHARACTERISTICS

The thermal resistance of B1117 is 15°C/W from junction to

tab and 31 °C/W from tab to ambient for a total of 46 °C/W

from junction to ambient. The B1117 features the internal

thermal limiting to protect the device during overload

conditions. Special care needs to be taken during continues

load conditions the maximum junction temperature does not

exceed 125 °C.

50 X 50 mm

35 X 17 mm

16 X 10 mm

Taking the FR-4 printed circuit board and 1/16 thick with 1

ounce copper foil as an experiment (fig.1 & fig.2), the PCB

material is effective at transmitting heat with the tab

attached to the pad area and a ground plane layer on the

backside of the substrate. Refer to table 1 for the results of

the experiment.

Fig. 2. Substrate Layout for SOT-223

The thermal interaction from other components in the

application can effect the thermal resistance of the B1117.

The actual thermal resistance can be determined with

experimentation. B1117 power dissipation is calculated as

follows:

P_D= (V_IN- V_OUT)(I_OUT

)

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556

www.baylinear.com

B1117

TOTAL PC BOARD AREA

TOPDIDE COPPER AREA

BACKSIDE COPPER AREA

THERMAL RESISTANCE

JUNCTION TO AMBIENT

2500mm

1600mm

2500mm

1600mm

900mm

2500mm

1250mm

950mm

2500mm

1800mm

600mm

1250mm

915mm

600mm

240mm

2500mm

46°C/W°

47°C/W°

49°C/W°

51°C/W°

53°C/W°

55°C/W°

58°C/W°

59°C/W°

67°C/W°

72°C/W°

85°C/W°

2500mm

1600mm

900mm

BAY

OUT

V_IN

B1117

OUT

B1117

C₁

ADJ

R₁

LOAD

V_OUT= V_REF(1+R₂/R₁) +ADJ

Typical Adjustable Regulator

1.0Amp Current output

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556

www.baylinear.com

B1117

SOT223 Package

0.124

0.116

0.146 0.295

0.130 0.264

0.041

0.033

0.0905 NOM

0.181 NOM

0.146

0.130

16 C

10 C

0.264

0.248

0.0040

0.0008

0.014

0.010

16 C

10 C Max

16 C

0.033

0.025

10 C

Advance Information- These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations,

computer simulations and/ or initial prototype evaluation.

Preliminary Information- These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are

subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges.

The application circuit examples are only to explain the representative applications of the devices and are not intended to guarantee any circuit

design or permit any industrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any

industrial property right resulting from the use of the contents shown in the data book. Typical parameters can and do vary in different

applications. Customer’s technical experts must validate all operating parameters including “ Typical” for each customer application.

LIFE SUPPORT AND NUCLEAR POLICY

Bay Linear products are not authorized for and should not be used within life support systems which are intended for surgical

implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications without

the specific written consent of Bay Linear President.

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556

www.baylinear.com

B1117M-2.5 [ETC]

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