background image

 

 Bay Linear, Inc    

2418 Armstrong Street, Livermore, CA 94550   Tel: (925) 606-5950, Fax: (925) 940-9556               www.baylinear.com

 

 

 

 

 

150 mA CMOS Low Dropout LDO 

 

B4150

ON/OFF & Bypass  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin Connection 

   

Ordering Information 

 

 

               

 

 

 

 

   

-40

°C to +125°

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 0.5

µA 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 

board real state. 

Features 

 

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

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

•  Shutdown Supply Current………………0.1µ

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

•  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

3

2

1

4

5

V

out

Bypass

Bay Linear 

Inspire the Linear Power 

BATTREY

1

µF

V

IN

GND

SHDN

V

OUT

Bypass

Shutdown Control

(to CMOS Logic or Tie to V

in

if Unused)

470pF

Reference

Bypass Cap

(optional)

1

µF

B4150

BATTREY

1

µF

V

IN

GND

SHDN

V

OUT

Bypass

Shutdown Control

(to CMOS Logic or Tie to V

in

if Unused)

470pF

Reference

Bypass Cap

(optional)

1

µF

B4150

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 Bay Linear, Inc    

2418 Armstrong Street, Livermore, CA 94550   Tel: (925) 606-5950, Fax: (925) 940-9556               www.baylinear.com

 

 

 

 

B4150

 

Absolute Maximum Ratings 

Parameter Symbol 

Ratings 

Units 

Input Voltage  

V

IN

 6.5  V 

 

Output Current  

I

OUT

 

150  

 mA 

CE Output Voltage  

V

OUT

 

 V

SS

 -0.3 to V

IN

 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 (T

a

 = 25

°C, V

IN 

= V

OUT + 

0.5V; unless otherwise noted)

 

Parameter Conditions 

MIN 

TYP 

MAX 

UNIT 

I

O

 = 1mA 

-1.4% 

+1.4% 

Output Voltage Accuracy 

I

O

 = 0 to 150mA 

-2% 

+2% 

Line Regulation               

∆V

OUT

/

∆V

IN

-V

OUT

 

I

O

= 100mA, 

(V

OUT 

 + 0.1V)<V

IN

<6V 

 

0.2 0.3 %/V 

Load Regulation 

VIN 6V, 0mA < I

O

 < 120mA 

C

OUT 

= 1

µF

 

 

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, 

T

A

=25

°C

 

 0.01 

100 nA 

Shutdown Exit Delay 

CBP=0

µF C

OUT

=1

µF, I

O

 = 1mA 

 30 

150 

µsec 

Shutdown Input Threshold Low 

V

in

=2.5 to 5.5V 

 

0.4 

 

Shutdown Input Threshold High 

V

in

=2.5 to 5.5V 

 

 

Ground Pin Current 

I

OUT  

= 0mA……150mA 

  2 

µA 

I

O

 = 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 

   

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 Bay Linear, Inc    

2418 Armstrong Street, Livermore, CA 94550   Tel: (925) 606-5950, Fax: (925) 940-9556               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 0.05

µA (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 1

µF (min) capacitor from V

out

 to ground is required. 

Then output capacitor should have an effective series 

resistance of 5

Ω 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

-V

OUTMIN

)I

LOADMAX 

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

-T

AMAX

)/ 

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

-V

OUTMIN

)I

LOADMAX 

=[(3.0 x 1.1)-(2.7 x 0.975)]40 x 10

-3 

=26.7mW 

 

Maximum allowable power dissipation: 

 

P

DMAX

=(T

JMAX

-T

AMAX

=(125-55)/220 

=318Mw 

These equations can be used to calculate maximum 

current and/or input voltage limits. 

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 Bay Linear, Inc    

2418 Armstrong Street, Livermore, CA 94550   Tel: (925) 606-5950, Fax: (925) 940-9556               www.baylinear.com

 

 

 

 

B4150

 

TEST CIRCUITS 

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 Bay Linear, Inc    

2418 Armstrong Street, Livermore, CA 94550   Tel: (925) 606-5950, Fax: (925) 940-9556               www.baylinear.com

 

 

 

 

B4150

 

Output Voltage VS. Output current 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Output Voltage vs. Input Voltage 

 

B4150-2.5 

B4150-3.0 

B4150-2.5 

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 Bay Linear, Inc    

2418 Armstrong Street, Livermore, CA 94550   Tel: (925) 606-5950, Fax: (925) 940-9556               www.baylinear.com

 

 

 

 

B4150

 

Dropout Voltage vs. Output Current 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Transient Response 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B4150-3.0 

B4150-2.5 

B4150-3.0 

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 Bay Linear, Inc    

2418 Armstrong Street, Livermore, CA 94550   Tel: (925) 606-5950, Fax: (925) 940-9556               www.baylinear.com

 

 

 

 

B4150

 

Load Transients Response 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn On Response Time 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ripple Rejection                                                        Output Noise 

B4150-3.0 

B4150-3.0 

 

 

B4150-3.0 

B4150-3.0 

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 Bay Linear, Inc    

2418 Armstrong Street, Livermore, CA 94550   Tel: (925) 606-5950, Fax: (925) 940-9556               www.baylinear.com

 

 

 

 

 

B4150

 

 

SOT-25 Packaging Outline 

 

L

A1

C

A2

A

D

B (5 PLACES)

H

E

e1

e

MILLIMETERS

SYMBOL

0

0.90

0.30

0.80 REF

2.70

0.10

1.40

1.70

0.95 BSC.

MIN 0.2

2.50

MIN.

MAX

MIN.

MAX.

A

A1

A2

B

C

D

E

e

e1

H

L

0

.035

.012

.0315 REF

.106

.004

.055

.066

.037 BSC.

MIN .0078

.098

0.10

1.30

0.50

3.10

0.35

1.80

2.10

3.00

.004

.051

.019

.122

.0137

.071

.082

.118

INCHES

NOTE:

1. REFER TO APPLICABLE

2. CONTROLLING DIMENTION : MILLIMETER

3. PACKAGE SURFACE FINISHING TO BE SMOOTH

FINISH.

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 Bay Linear, Inc    

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

 

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.