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Part: B4300CR-3.8
Category:
Description: 3.8V 300mA CMOS Low Dropout LDO
Company: Bay Linear
Datasheet: Download B4300CR-3.8 datasheet File size : 46 kB
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Datasheet text preview:
Bay Linear
Inspire the Linear Power
300 mA CMOS Low Dropout LDO Description
The B4300 series are a group of positive output voltage, three-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 B4300 consists of a high-precision voltage reference, an error correction circuit, and a current limited output driver. Available in SOT-89 (300mW), and SOT-223 (500mW) packages minimizing the usage of board real state.
B4300
Features
· · · · · · · · Maximum output current: 300 mA. Highly accurate: Output voltage +/- 1.4% Extremely Low Ground Current 6µA CMOS low power consumption. Over-Current & Over-Temp. Protection Small input/output differential: 0.3V @ 300mA 0.1V @ 100mA Pin-to-Pin replacement for TC1108 & XC6203 Offered in SOT-89 & SOT-223
Applications
· · · · Battery Powered Equipment Notebook PC, Palmtops, PDA Portable Cameras and Video Recorders Reference Voltage Sources
Pin Connection
Ordering Information
Package
SOT-89 SOT-223
Part No.
B4300CR-X.X B4300CN-X.X
X.X = Fixed Output Voltages from 2.0V to 6.0V
SOT-223 (N)
Vin 2 1 Vss 2 3
SOT-89 (R)
Vin 2 1 Vss 2 Vin 3 Vout
Vin Vout
Top View
Top View
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B4300
Absolute Maximum Ratings
Parameter Input Voltage Output Current Output Voltage Continual Total Power Dissipation Operating Ambient Temperature Storage Temperature Symbol V IN I OUT V OUT SOT-89 SOT-223 Pd TOPR TSTG Ratings 6.5 300 VSS -0.3 to VIN 0.3 300 500 -30 to 80 -40 to 125 Units V mA V mW °C °C
Electrical Characteristics (Ta = 25°C, VIN = VOUT + 0.5V; unless otherwise noted)
Parameter Output Voltage Line Regulation V OUT Load Regulation Maximum Output Current Current Limit Output Noise Input Operation Voltage Ground Pin Current Dropout Voltage Thermal Shutdown Temperature F=10KHz, Cout=1µF, RLOAD=50 IOUT = 100mA IO = 100mA IO = 300 mA VOUT/VINConditions IO = 0mA IO = 0 to 300mA IO 100mA, (VOUT + 0.1V)
2 110 270 155
Marking Format SOT-89
B4300 XZYWW
D = B4300
Variables
X = Voltage Codes
B = 2.0 C = 2.5 D = 2.8 E = 3.0 F= G= H= 3.3 3.5 5.0
Z = Production Code
Y = Year 01 = 2001 02 = 2002 03 = 2004 etc
WW = Work Week Code SOT-23 = 01 to 99 SOT-89 = 01 to 52
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B4300
PRODUCT DESCRIPTION
The B4300 is precision fixed output voltage regulator. Unlike bipolar regulators, the B4300 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. 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 (JA). PDMAX=(TJMAX-TAMAX)/ 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: VINMAX=3.3V+10% VOUTMIN=2.7V-2.5% ILOADMAX=275 mA TJMAX=125°C TAMAX=95°C JA= 59°C/W Find: 1. Actual power dissipation 2. Maximum allowable dissipation
Output Capacitor
A 1µF (min) capacitor from Vout to ground is required. Then output capacitor should have an effective series resistance of 5 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 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:
VIN C1 1µF BATTREY BATTREY GND VOUT C2 1µF
B4300
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B4300
A
C
J
N P 1 2 3
K B F G -TD
STYLE 1 PIN 1. BASE 2. COLLECTOR 3. EMITTER
STYLE 3 PIN 1. GATE 2. ANODE 3. CATHODE
DIM A B C D E F G J K L N P
STYLE 2 PIN 1. ANODE 2. CATHODE 3. NO CONNECTION
STYLE 4 PIN 1. DRAIN 2. GATE 3. SOURCE
MILLIMETERS MIN MAX 4.40 4.60 2.29 2.60 140 160 0.36 0.48 1.62 1.80 0.44 0.53 150 BSC 0.35 0.44 0.80 1.04 300 BSC 2.04 2.28 3.94 4.25
INCHES MIN MAX 0.174 0.181 0.091 0.102 0.056 0.062 0.015 0.018 0.064 0.070 0.018 0.020 0.059 BSC 0.014 0.017 0.032 0.040 0.118 BSC 0.081 0.089 0.156 0.167
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B4300
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
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