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

Bay Linear

Inspire the Linear Power

150 mA CMOS Low Dropout LDO		B4150
ON/OFF & Bypass

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 board 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

Pin Connection

Ordering Information

-40°C to +125°C

Package

Part No.

VIN

VOUT

SOT-25

B4150CK5 -X.X

1µF

1µF

B4150

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

BATTREY

GND

Bypass

470pF

SOT-25 (K5)

SHDN

Reference

Vout

Bypass

Bypass Cap

(optional)

Shutdown Control

5

4

(to CMOS Logic or Tie to Vin if Unused)

1

2

3

Vin ON/OFF

GND

Top View

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

IOUT

150

mA

CE Output Voltage

VOUT

VSS -0.3 to VIN 0.3

V

Continual Total Power Dissipation

SOT-25

Pd

150

mW

SOT-89

300

Operating Ambient Temperature

TOPR

-30 to 80

°C

Storage Temperature

TSTG

-40 to 125

°C

Electrical Characteristics (Ta = 25°C, VIN = VOUT + 0.5V; unless otherwise noted)

Parameter

Conditions

MIN

TYP

MAX

UNIT

Output Voltage Accuracy

IO = 1mA

-1.4%

-

+1.4%

V

IO = 0 to 150mA

-2%

-

+2%

Line Regulation

∆VOUT/∆VIN-VOUT

IO= 100mA,

0.2

0.3

%/V

(VOUT

+ 0.1V)<VIN<6V

Load Regulation

VIN 6V, 0mA < IO < 120mA

0.01

0.04

%/mV

COUT = 1µF

Maximum Output Current

150

mA

Current Limit

160

500

Output Noise (en)

f=300Hz 100kHz, Cout=1µF,

30

µV(rms)

I=10mA, Cin=1µF

Ripple Rejection Rate (PSSR)

Iout=50mA, f=10kHz

70

dB

Shutdown Supply Current

TA=25°C

0.01

1

µA

Shutdown Input Bias Current

VSHDN=VIN, TA=25°C

0.01

100

nA

Shutdown Exit Delay

CBP=0µF COUT=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

IOUT = 0mA……150mA

2

µA

Dropout Voltage

IO = 100mA

110

160

mV

IO = 150 mA

165

250

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

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, Vout 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 VIH. And shutdown (disabled) when SHDN is at or below VIL. 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 Vout 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 Vout to ground is required. Then output capacitor should have an effective series resistance of 5Ω or less. A 1µA capacitor should be connected from Vin 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 approximately30°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.

B4150

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:

PD=(VINMAX-VOUTMIN)ILOADMAX

Where:

PD= worst case actual power dissipation

VINMAX= Maximum voltage on VIN VOUTMIN=Minimum regulator output voltage

ILOADMAX= maximum output (LOAD) Current

The maximum allowable power dissipation is function of the maximum ambient temperature (TAMAX). The maximum allowable die temperature (125°C) and the thermal resistance from junction-to-air (θJA). The 5- pin SOT-23A package has a θJA of approximately 220°C/Watt when mounted on a single layer FR4 dielectric copper clad PC board.

PDMAX=(TJMAX-TAMAX)/ θJA

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:

VINMAX=3.0V+10%

VOUTMIN=2.7V-2.5%

ILOADMAX=40 mA

TJMAX=125°C

TAMAX=55°C

Find:

1.Actual power dissipation

2.Maximum allowable dissipation

Actual power dissipation:

PD=(VINMAX-VOUTMIN)ILOADMAX

=[(3.0 x 1.1)-(2.7 x 0.975)]40 x 10-3 =26.7mW

Maximum allowable power dissipation:

PDMAX=(TJMAX-TAMAX)

=(125-55)/220 =318Mw

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

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone]

www.baylinear.com