Datasheet B1587D-3.0, B1587D-2.5, B1587D-1.5, B1587T-ADJ, B1587T-5 Datasheet (BAYLI)

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com

4.0A Low Dropout Voltage Regulator

B1587

Adjustable & Fix Output

Pin Connection

Ordering Information

Devices Package Temp.

B1587T TO-220

0 °C to 70 °C

B1587S TO-263

0 °C to 70 °C

B1587D TO-252

0 °C to 70 °C

B1587J LPDD

0 °C to 70 °C

Description

The Bay Linear B1587 is Monolithic low power 4.0A Adjustable and fixed NPN voltage regulator that are easy to use with minimum external components. It is suitable for applications requiring a well-regulated positive output voltage with low input-output differential voltage requirements and output voltage 1.5V, 2.5V, 3.0V, 3.3V, or 5V.

The B1587 Outstanding features include full power usage up to 4.0Amp of load current internal current limiting and thermal shutdown. Other fixed versions are also available consult with factory. The B1587 is offer in a new LPDD (Low Profile TO-

263) package from 4.47 mm (DD) thickness down to only 1.27 mm (LPDD) total thickness.

The B1587 is offered in a 3-pin TO-220, TO-263 & TO-252 packages compatible with other 3 terminal regulators. For 5A Low dropout Regulator refer to the B1585 data sheet.

Features

• Adjustable Output Down to 1.2V

• Fixed Output Voltages 2.5V, 3.0V 3.3V,

and 5.0V

• Output Current of 4.0A

• Low Dropout Voltage 1.1V Typ.

• Current & Thermal Limiting

• Standard 3-Terminal Low Cost TO-220,

D

2

, D Packages

•

Similar to industry Standard LT1085/LT1587/LT1585

Applications

• 3.3V to 2.5V for Pentium Processor

• SMPS Post Regulator

• High Efficiency “Green” Computer

Systems

• High Efficiency Linear Power Supplies

• 5V to 3.XXV for Pentium Processor

• Battery Charger

Front View

TO-252 (D)

ADJ/ GND

V

IN

V

OU

T

1

23

Top View

TO-263-3 (

1

Bay Linear

2

3

Top View

TO-263-3 (S)

1

Bay Linear

2

3

Top View

TO-263-3 (

1

Bay Linear

2

3

Top View

TO-263-3 (S)

1

Bay Linear

2

3

Bay Linear

Bay LinearBay Linear

Bay Linear

Inspire the Linear Power

Inspire the Linear PowerInspire the Linear Power

Inspire the Linear Power

LPDD (J)

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com

B1587

Absolute Maximum Rating

Parameter Symbol Value Unit

Maximum Input Voltage V

IN

7 V

Power Dissipation P

O

Internally Limited W

Thermal Resistance Junction to Case

θ

JC

3

Thermal Resistance Junction to Ambient

θ

JA

50

°

C/W

Operating Junction Temperature Range Control Section Power Transistor

T

J

0 to 125 0 to 150

Storage Temperature Range T

STG

-65 to 150

Lead Temperature (Soldering 10 Sec.)

T

LEAD

260

°

C

Electrical Characteristics

(VIN = 4.75V to 5.25V; IO = 10mA to 4.0Amp, unless otherwise specified)

Parameter Symbol Conditions MIN TYP MAX UNIT

1.485 1.515

0<I

OUT

<4A, 3.3V<VIN<7V, T= 25 °C

0<I

OUT

<4A, 3.3V<VIN<7V, Over Temp.

1.475

1.5

1.525

2.475 2.525

0<I

OUT

<4A, 4.0V<VIN<7V, T= 25 °C

0<I

OUT

<4A, 4.0V<VIN<7V, Over Temp.

2.460

2.5

2.540

2.970 3.030

0<I

OUT

<4A, 4.5V<VIN<7V, T= 25 °C

0<I

OUT

<4A, 4.5V<VIN<7V, Over Temp.

2.950

3.0

3.050

3.267 3.333

0<I

OUT

<4A, 4.8V<VIN<7V, T= 25 °C

0<I

OUT

<4A, 4.8V<VIN<7V, Over Temp.

3.247

3.3

3.353

4.950 5.050

Output Voltage V

O

0<I

OUT

<4A, 6.5V<VIN<7V, T= 25 °C

0<I

OUT

<4A, 6.5V<VIN<7V, Over Temp.

4.920

5.0

5.080

V

1.238 1.262 Reference Voltage V

ref

VIN<7V, 1.5V<VIN<5.75, 10Ma<I

out

<4Amp

1.230

1.250

1.270

V

Line Regulation (1) REG

(line)

IO = 10mA, VIN =5V, T= 25 °C

0.04 0.2

0.08 0.40 Load Regulation (1) REG

(LOAD)

IO = 10mA, VIN =5V, T= 25 °C

%

1.0 1.1 Dropout Voltage V

D

T= 25 °C, I

OUT

=3A

T= 25 °C, I

OUT

=4A

1.1 1.3

V

Minimum load Current I

min

5 10 mA

Current Limit I

S

(Vin-V

out

)=3V 3 5 A

Ground Pin Current I

Q

VIN =5V 5 10 mA

Temperature Stability T

S

IO = 10mA, VIN =5V 0.5 %

Thermal Regulation

T= 25 °C, 30ms pulse

0.003 %/W

Ripple Rejection R

A

T= 25 °C, VIN =5V

60 75 dB

Thermal Resistance - TO-220 Junction to Tab

Junction to Ambient DD Package Junction to Tab Junction to Ambient

3.0 60

°

C/W

Note:

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

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com

B1587

APPLICATION HINTS

The Bay Linear B1587 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative tr ansient voltage . However, the use of an output capacitor is required in order to insure the stability and the performances.

Stability

The output capacitor is part of the regulator’s frequency compensation system. Either a 220µF aluminum electrolytic capacitor or a 47µF solid tantalum capacitor between the output terminal and ground guarantees stable operation for all operating conditions. However, in order to minimize overshoot and undershoot, and therefore optimize the design, please refer to the section ‘Ripple Rejection’.

Ripple Rejection

Ripple rejection can be improved by adding a capacitor between the ADJ pin and ground. When ADJ pin bypassing is used, the value of the output capacitor required increases to its maximum (220µF for an aluminum electrolytic capacitor, or 47µF for a solid tantalum capacitor). If the ADJ pin is not bypass, the value of the output capacitor can be lowered to 100µF for an electrolytic aluminum capacitor or 15µF for a solid tantalum capacitor. However the value of the ADJ-bypass capacitor should be chosen with respect to the following equation: C = 1 / ( 6.28 * F

R

* R1 )

Where C = value of the capacitor in Farads (select an equal or larger standard value), F

R

= ripple frequency in Hz,

R

1

= value of resistor R1 in Ohms.

If an ADJ-bypass capacitor is use, the amplitude of the output ripple will be independent of the output voltage. If an ADJ-bypass capacitor is not used, the output ripple will be proportional to the ratio of the output voltage to the reference voltage: M = V

OUT

/ V

REF

Where M = multiplier for the ripple seen when the ADJ pin is optimally bypassed.

V

REF

= Reference Voltage

Reducing parasitic resistance and inductance

One solution to minimize parasitic resistance and inductance is to connect in parallel capacitors. This arrangement will improve the transient response of the power supply if your system requires rapidly changing current load condition.

Thermal Consideration

Although the B1587 offers some limiting circuitry for overload conditions, it is necessary not to exceed the maximum junction temperature, and therefore to be careful about thermal resistance. The heat flow will follow the lowest resistance path, which is the Junction-to-case thermal resistance. In order to insure the best thermal flow of the component, a proper mounting is required. Note that the case of the device is electrically connected to the output. In case the case has to be electrically isolated, a thermally conductive spacer can be used. However do not forget to consider its contribution to t hermal resistance.

Assuming: V

IN

= 10V, V

OUT

= 5V, I

OUT

= 4A, TA = 90°C,

θ

CASE

=

1°C/W (no external heat sink, no wind)

Power dissipation under these conditions P

D

= (VIN – V

OUT

) * I

OUT

= 15W

Junction Temperature T

J

= TA + PD * (

θ

CASE

+

θ

JC

)

For the Control Section T

J

= 90°C + 15W*(1°C/W + 0.6°C/W) = 114°C

114°C < T

JUNCTION MAX

for the control section.

For the Power Section T

J

= 90°C + 15W*(1°C/W + 1.6°C/W) = 129°C

129°C < T

JUNCTION MAX

for the power transistor.

In both case reliable operation is insured by adequate junction temperature.

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com

B1587

Basic Adjustable Regulator

Output Voltage Output Voltage

Output Voltage

Consider Figure 2. The resistance R1 generates a constant current flow, normally the specified load current of 10mA

This current will go through the resistance R2 to set the overall output voltage. The current I

ADJ

is very small and constant. Therefore its contribution to the overall output voltage is very small and can generally be ignored

Load Regulation

Parasitic line resistance can degrade load regulation. In order not to affect the behavior of the regulator, it is best to connect directly the R

1

resistance from the resistor divider to the case, and not to the load. For the same reason, it is best to connect the resistor R

2

to the Negative side of the

load.

BAY

B1587

Fig.2 Basic Adjustable Regulator

V

OU

T

V

OU

T

V

REF

R

1

R

2

V

OUT

= V

REF

* ( 1 + R2/R1) + I

ADJ

* R

2

I

ADJ

50µA

BAY

B1587

Fig.3 Basic Adjustable Regulator

V

OUT

R

2

R

1

Connect R2 to Load

R

L

Connect R1 to

Case of Regulator

R

P

Parasitic Line Resistance

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com

B1587

IN

OUT

ADJ

BAY

B1587

C

1

R

1

R

2

V

OUT

Fig 5. Typical Adjustable Regulator

V

OUT

= V

REF

(1 + R2) + I

ADJ R2

R1

V

IN

C

2

BAY

B1587

Fig. 6 Improving Ripple Rejection

V

IN

R

1

R

2

150µF

10µF*

121Ω

1%

365Ω

1%

+

10µF

C1

*C1 improves ripple rejection. X

C

should be ~ R1 at ripple frequency.

5V

ADJ

IN OUT

(Note A)

Note A: V

IN (MIN)

= ( Intended V

OUT

) + ( V

DROPOUT (MAX)

)

V

OUT

BAY

B1587

Fig.7 5V Regulator with Shutdown

V

IN

100µF

121Ω

1%

365Ω

1%

+

10µF

5V

ADJ

IN OUT

(Note A)

Note A: V

IN (MIN)

= ( Intended V

OUT

) + ( V

DROPOUT (MAX)

)

1k

TTL

Output

2N3904

LOAD

ADJ

BAY B1587

Fig.4 4A Curr en t Out put Regulator

V

IN

C

1

R

1

OUT

IN

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com

B1587

TYPICAL CHARACTERISTICS

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com

B1587

4

3

21

E b

2

-A-

L

2

D

L

3

L

1

b

1

e

-C-

e1

D

1

E

1

BACK VIEW A-A

TERM 4

C

.010

M

A M

3 PLCS

-BA A

1

C

1

c

8

A

SEATING

PLANE

H

L

5. D1 & E1 Establishes A Minimum Mounting Surface for Terminal 4.

NOTES

1. Refer To Applicable Symbol List.

2. Dimensions And Tolerancing Per Ansi Y14.5m - 1982.

3. Lead Dimension Uncontrolled in L

3

.

4. Tab Contour Optional Within Dim. b

2

& L2 And E1 & D

1

6. L is the Termal Length for Soldering.

7. Controlling Dimension: Inch

8. 2 Mils Suggested For Postive Contact At Mounting.

b

MIN MAX MIN MAX

A 0.086 0.094 2.184 2.3876

A1 0.035 0.045 0.889 1.143

b 0.025 0.035 0.635 0.889 b1 0.300 0.045 7.620 1.143 b2 0.205 0.215 5.207 5.461 4

c 0.018 0.023 0.457 0.5842 c1 0.018 0.023 0.457 0.5842

D 0.235 0.245 5.969 6.223

D1 0.170 - 4.318 - 4,5

E 0.250 0.265 6.350 6.731

E1 0.170 - 4.318 - 4,5

e e1

H 0.370 0.410 9.398 10.414

L 0.020 - 0.508 - 6 L1 0.025 0.040 0.635 1.016 L2 0.035 0.050 0.889 1.270 4 L3 0.045 0.060 1.143 1.524 3

4.572

S Y

M

B

O

L

0.098

MM

2.489

0.180

N O T E

INCHES

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com

B1587

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 application s without the specific written consent of Bay Linear President.

0.103 BSC

0.050 (1.270)

0.600

+

-

0.025

0.405

0.005

0.055 (1.397)

(10.287 0.127)

± ±

0.356 0.005

(9.042 0.127)

± ±

(15.24

0.635)

±

(2.616)

0.032

+

-

0.001

(0.813 0.025)

+

-

0.176

0.005

0.050

0.002

0.015

+

-

0.003

0°

8°

(0.381 0.074)

+

-

0.100 0.010

(2.540

0.254)

±

(4.470

0.127)

±

(1.270

0.051)

±

± ±