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Bay Linear
Inspire the Linear Power
600 mA Low Dropout Voltage Regulators Description
The B4600 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 2A typ., and high accuracy is achieved though CMOS construction and programmable fuse technologies. Output voltage: 2.0V to 6.0V in 0.1V increments. The B4600 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.
B4600
Features
* * * * Maximum Output Current: 600 mA. Highly accurate: Output voltage +/- 2.5%. Only 2A 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
Pin Connection
Ordering Information
Package
SOT-223 SOT-89
Part No.
B4600CN-X.X B4600CR-X.X
SOT-89 (R)
X.X = Fixed Output Voltages from 2.0V to 6.0V
SOT-223 (N)
Vin 2 1 Vss 2 3
Vin 2 1 Vss 2 3
Vin Vout
Vin Vout
Top View
Top View
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B4600
Absolute Maximum Ratings
Parameter Input Voltage Output Current Output Voltage Continual Total Power Dissipation Operating Ambient Temperature Storage Temperature Symbol VIN IOUT VOUT SOT-223 SOT-89 Pd TOPR TSTG Ratings 6.5 800 VSS -0.3 to VIN 0.3 500 300 -30 to 80 -40 to 125 Units V mA V mW C C
Electrical Characteristics (Ta = 25C, VIN = 5V; unless otherwise noted)
Parameter Output Voltage Line Regulation Load Regulation Maximum Output Current Current Limit Ground Pin Current Dropout Voltage Thermal Shutdown Temperature VOUT/VIN-VOUT Conditions IO = 0mA IO = 0 to 600mA IO= 100mA, (VOUT + 0.1V)Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B4600
PRODUCT DESCRIPTION
The B4600 is precision fixed output voltage regulator. Unlike bipolar regulators, the B4600 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 0.05A (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 (125C) 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=125C TAMAX=95C JA= 59C/W Find: 1. Actual power dissipation 2. Maximum allowable dissipation
Output Capacitor
A 1F (min) capacitor from Vout to ground is required. Then output capacitor should have an effective series resistance of 5 or less. A 1A 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- 30C, 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 160C. 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 1F BATTREY GND VOUT C2 1F
B4500
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B4600
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) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B4600
Bay Linear, Inc
2478 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.
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com

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