Datasheet B4500CR-3.2, B4500CR-3.1, B4500CR-3.0, B4500CR-2.9, B4500CR-2.8 Datasheet (BAYLI)

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

500 mA Low Dropout Voltage Regulators

B4500

Preliminary Information

Pin Connection

Ordering Information

Package Part No.

SOT-223 B4500CN-X.X
SOT-89 B4500CR-X.X

X.X = Fixed Output Voltages from 2.0V to 6.0V

Description

The B4500 series are a group of positive output voltage,
three-pin regulators, that provide a high current even
when the input/output voltage differential is small. Very
low power consumption, only 2µA typ., and high
accuracy is achieved though CMOS construction and
programmable fuse t echnologies. Output voltage: 2.0V
to 6.0V in 0.1V increments.

The B4500 consists of a high-precision voltage
reference, an error correction circuit, and a current
limited output driver.

Available in SOT223 (500mW) and SOT-89 (300mW)
packages minimizing the usage of board real state.

Features

• Maximum Output Current: 500 mA.

• Highly accurate: Output voltage +/- 2%.

• Only 2µµµµA power Consumption.

• Very Low Dropout:

0.11V @ 100mA

0.3V @ 300mA

0.5V @ 450mA

• Offered in SOT-89 & SOT-223 Packages

Applications

• Battery Powered Equipment

• Notebook PC, Palmtops, PDA

• Portable Cameras and Video Recorders

• Reference Voltage Sources

Top View

SOT-223 (N)

1

2

3

Vss Vin Vout

2

Vin

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p

ire the Linear Power

Top View

SOT-89 (R)

1

2

3

Vss Vin Vout

2

Vin

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

B4500

Absolute Maximum Ratings

Parameter Symbol Ratings Units

Input Voltage VIN 6.5 V
Output Current I

OUT

800 mA

Output Voltage V

OUT

V

SS

-0.3 to VIN 0.3 V

SOT-223 500

Continual Total
Power Dissipation

SOT-89

Pd

300

mW

Operating Ambient Temperature T

OPR

-30 to 80

°

C

Storage Temperature T

STG

-40 to 125

°C

Electrical Characteristics (Ta = 25

°°°°

C, V

IN

= V

OUT +

0.5V; unless otherwise noted)

Parameter Conditions MIN TYP MAX UNIT

IO = 0mA -1.4% - +1.4%

Output Voltage

I

O

= 0 to 500mA -2% - +2%

V

Line Regulation ∆V

OUT

/∆VIN-V

OUT

I

O

=100mA,

(V

OUT

+ 0.1V)<VIN<6V

0.2 0.3 %/V

Load Regulation

VIN =6V, 0mA < I

O

< 500mA

C

OUT

= 1µF

0.04 %/mV

Maximum Output Current 500
Current Limit 900

mA

Ground Pin Cur rent I

OUT

= 100mA

2 6

µ

A

IO = 100mA 110 160

IO = 300 mA

300 450

Dropout Voltage

I

O

= 500 mA

450

mV

Thermal Shutdown Temperature

155

°

C

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

B4500

PRODUCT DESCRIPTION

The B4500 is precision fixed output voltage regulator.
Unlike bipolar regulators, the B4500 supply current
does not increase with load current. In addition, V

out

remains stable and within regulator at very low load
currents (an important consideration in RTC and
CMOS RAM battery back-up application).

Figure 1 shows a typical application circuit. The
regulator is enabled any time the shutdown input is at
or above V

IH.

And shutdown (disabled) when SHDN is

at or below V

IL

. SHDN maybe controlled by a CMOS
logic gate, or I/O port of a micro controller. If the
SHDN input is not. Required, it should be connected
directly to the supply. While in shutdown, supply
current decreases to 0.05µA (typical) and V

out

falls to

zero volts.

Output Capacitor

A 1µF (min) capacitor from V

out

to ground is required.
Then output capacitor should have an effective series
resistance of 5Ω or less. A 1µA capacitor should be
connected from V

in

to GND if there is more than 10
inches of wire between the regulator and the AC filter
capacitor, or if a battery is used as the power source.
Aluminum electrolytic or tantalum capacitor types can
be used. (since many aluminum electrolytic capacitors
freeze at approximately- 30°C, solid tantalums are
recommended for applications operating below –25

°

C.) When operating from sources other than
batteries, supply-noise rejection and transient response
can be improved by increasing the value of the input
and output capacitors and employing passive filtering
techniques.

Thermal Considerations

Thermal Shutdown

Integrated thermal protection circuitry shuts the
regulator off when die temperature exceeds 160°C.
The regulator remaining off until the die temperature
drops to approximately 140 °C.

Power Dissipation

The amount of power the regulator dissipates is
primarily a function of input and output voltage, and
output current. The following equation is used to
calculate worst case power dissipation:

P

D

=(V

INMAX-VOUTMIN)ILOADMAX

Where:
P

D

= worst case actual power dissipation

V

INMAX

= Maximum voltage on V

IN

V

OUTMIN

=Minimum regulator output voltage

I

LOADMAX

= maximum out put (LOAD) Current

The maximum allowable power dissipation is function
of the maximum ambient temperature (T

AMAX

). The
maximum allowable die temperature (125°C) and the
thermal resistance from junction-to-air (

θ

JA

).

P

DMAX

=(T

JMAX-TAMAX

)/

θ

JA

Where all terms are previously defined

This can be caused in conjunction with other equation
to ensure regulator thermal operation is within limit.
For example:

Given:

V

INMAX

=3.3V+10%

V

OUTMIN

=2.7V-2.5%

I

LOADMAX

=275 mA

T

JMAX

=125°C

T

AMAX

=95°C

θ

JA

= 59°C/W

Find:

1. Actual power dissipation

2. Maximum allowable dissipation

BATTREY

C

1

1µF

V

IN

GND

V

OUT

C

2

1µF

BATTREY

C

1

1µF

V

IN

GND

V

OUT

C

2

1µF

B4500

BATTREY

C

1

1µF

V

IN

GND

V

OUT

C

2

1µF

BATTREY

C

1

1µF

V

IN

GND

V

OUT

C

2

1µF

B4500

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

B4500

A

1

2

3

P

K

F

G

D

B

STYLE 1

PIN 1. BASE

2. COLLECTOR

3. EMITTER

STYLE 3

PIN 1. GATE

2. ANODE

3. CATHODE

STYLE 2

PIN 1. ANODE

2. CATHODE

3. NO CONNECTION

PIN 1. DRAIN

2. GATE

3. SOURCE

STYLE 4

MILLIMETERS INCHES

DIM

MIN MAX MIN MAX
A 4.40 4.60 0.174 0.181
B 2.29 2.60 0.091 0.102

C 140 160 0.056 0.062
D 0.36 0.48 0.015 0.018

E 1.62 1.80 0.064 0.070
F 0.44 0.53 0.018 0.020

G

J 0.35 0.44 0.014 0.017
K 0.80 1.04 0.032 0.040
L 300 BSC 0.118 BSC

N 2.04 2.28 0.081 0.089

P 3.94 4.25 0.156 0.167

150 BSC 0.059 BSC

-T-

N

C

J

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

B4500

Bay Linear, Inc

2478 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

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.

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