BAYLI B4150CK5-6.0, B4150CK5-5.9, B4150CK5-5.8, B4150CK5-5.7, B4150CK5-5.6 Datasheet

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

150 mA CMOS Low Dropout LDO

B4150

ON/OFF & Bypass

Pin Connection

Ordering Information

-40°C to +125°C

Package Part No.

SOT-25 B4150CK5 -X.X

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

Description

The B4150 series are a group of positive output voltage,
five-pin regulators, which provide a high current even
when the input/output voltage differential is small. Low
power consumption and high accuracy is achieved
though CMOS and programmable fuse technologies.
Output voltage: 2.0V to 6.0V in 0.1V increments.

The B4150 consists of a high-precision voltage
reference, an error correction circuit, and a current
limited output driver. Key features include a Shutdown
Pin that reduces supply current to 0.5µA max and a
470pF Bypass input to ground reduces noise present on
the internal reference, which in turn significantly reduce
output noise. If output noise is not concern, this input
maybe left unconnected. Larger capacitor values cap be
used, but results in longer time period to rated output
voltage when power initially applied.

The ON/OFF pin enables the output to be turned off,
resulting in reduced power consumption. Provided in
SOT-25 (150mW) packages minimizes the usage of

b

oard real state.

Features

• Maximum output current:…………... 150 mA.

• Highly accurate: Output voltage…... +/- 1.4%.

• Shutdown Supply Current………………0.1µA

• Ground Current of Less than……………. 2µA

• CMOS low power consumption.

0.165V at 150mA

0.110V at 100mA

• Low Output Noise: 30µVrms

• High Ripple Rejection: 70dB(10kHz)

• Shut Down Mode for Power Savings

• Reference Bypass for Ultra Low Noise

• Improve pin-to-pin TC1185/XC6204/S-814

• Pin-to-Pin Low Power to Bipolar LDO’s

MIC5205 / LP2985/LT1761

Applications

• Battery Powered Equipment

• Notebook PC, Palmtops, PDA

• Portable Cameras and Video Recorders

• Reference Voltage Sources

• Cellular / GSM / PCS Phones

SOT-25 (K5)

Top View

ON/OFF

V

in

GND

32

1

45

V

out

Bypass

Bay Linear

Inspire the Linear Power

BATTREY

1µF

V

IN

GND

SHDN

V

OUT

Bypass

Shutdown Control
(to CMOS Logic or Tie to V

in

if Unused)

470pF
Reference
Bypass Cap
(optional)

1µF

B4150

BATTREY

1µF

V

IN

GND

SHDN

V

OUT

Bypass

Shutdown Control
(to CMOS Logic or Tie to V

in

if Unused)

470pF
Reference
Bypass Cap
(optional)

1µF

B4150

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

B4150

Absolute Maximum Ratings

Parameter Symbol Ratings Units

Input Voltage VIN 6.5 V
Output Current I

OUT

150 mA

CE Output Voltage V

OUT

V

SS

-0.3 to VIN 0.3 V

Continual Total Power Dissipation SOT-25

SOT-89

Pd

150
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 = 1mA -1.4% - +1.4%

Output Voltage Accuracy

I

O

= 0 to 150mA -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

< 120mA

C

OUT

= 1µF

0.01

0.04 %/mV

Maximum Output Current 150
Current Limit 160 500

mA

Output Noise (en)

f=300Hz∼100kHz, C

out

=1µF,

I=10mA, C

in

=1µF

30

µV(rms)

Ripple Rejection Rate (PSSR) I

out

=50mA, f=10kHz 70 dB

Shutdown Supply Current

T

A

=25°C

0.01 1

µA

Shutdown Input Bias Current

VSHDN=V

IN, TA

=25°C

0.01 100

nA

Shutdown Exit Delay

CBP=0µF C

OUT

=1µF, IO = 1mA

30 150

µsec
Shutdown Input Threshold Low Vin=2.5 to 5.5V 0.4 V
Shutdown Input Threshold High Vin=2.5 to 5.5V 2 V
Ground Pin Current I

OUT

= 0mA……150mA

2

µA

IO = 100mA 110 160

Dropout Voltage

I

O

= 150 mA

165 250

mV

Thermal Shutdown Temperature

155

°C

Marking Format

SOT-25

EXWW

E = B4150

Variables

X = Voltage Codes WW = Work Week Code

B = 2.0 F = 3.3

SOT-25 = 01 to 99

C = 2.5 G = 3.5

D = 2.8 H = 5.0

E = 3.0

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

B4150

PRODUCT DESCRIPTION

The B4150 is precision fixed output voltage regulator.
Unlike bipolar regulators, the B4150 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.

Bypass Input

A 470pF capacitor connected from the bypass input to
ground reduces noise present on the internal reference,
which in turn significantly reduces output noise. If
output noise is not a concern, this input maybe left
unconnected. Larger capacitor values maybe used, but
it results in a longer time period to rated output
voltage power is initially applied.

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 150 °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 output (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

). The 5-

pin SOT-23A package has a θ

JA

of approximately
220°C/Watt when mounted on a single layer FR4
dielectric copper clad PC board.

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

=3.0V+10%

V

OUTMIN

=2.7V-2.5%

I

LOADMAX

=40 mA

T

JMAX

=125°C

T

AMAX

=55°C

Find:

1. Actual power dissipation

2. Maximum allowable dissipation

Actual power dissipation:

P

D

=(V

INMAX-VOUTMIN)ILOADMAX

=[(3.0 x 1.1)-(2.7 x 0.975)]40 x 10

-3

=26.7mW

Maximum allowable power dissipation:

P

DMAX

=(T

JMAX-TAMAX

)

=(125-55)/220

=318Mw
These equations can be used to calculate maximum
current and/or input voltage limits.