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Bay Linear
Inspire the Linear Power
1.5A High Current Low Dropout
Voltage Regulator Adjustable & Fix Output
B29150
Preliminary Information
Description
The Bay Linear B29150 is a 1.5A high accuracy, low dropout voltage regulator with only 350mV(Typ.)@ 1.5A). The B29150 is designed for low voltage a application that requires lower dropout voltage and faster transient response. This device is an excellent choice for use in powering low voltage microprocessor that require a lower dropout, faster transient response to regulate from +2.5V to 3.8V supplies and as a post regulator for switching supplies applications. The B29150 offers full protection against over-current faults, reversed input polarity, reversed load insertion, and positive and negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. Features such as Enable pin, Error Flag pin are also included in the 5 pin packages. The B29150 is offer in a new LPDD (Low Profile TO-263) package from 4.47 mm (DD) tickness down to only 1.27 mm (LPDD) total tickness. The B29150 are offered in a 3 & 5-pin TO-220 & TO-263 package compatible with other 3 terminal regulators. For a 3A low dropout regulator refer to the B39300 data sheet.
Features
* * * * * * * * * Adjustable & Fix Output 1% output accuracy @2.5V, 3.3V, @ 5.0V Output Current of 1.5A Low Dropout Voltage of 350mV @ 1.5A Extremely Tight Load & Line Regulation Reverse-battery and "Load Dump" Protection Zero Current Shutdown Mode (5-pin version) Error Flag Signal Output-of-Regulation (5-pin version) Offer in TO-263, TO-220, & New Slim LPDD Similar to industry Standard MIC29150
*
Applications
* * * * * * Powering VGA & Sound Card LCD Monitor USB Power Supply SMPS Post Regulator High Efficiency "Green" Computer System Adjustable Power Supply
Pin Connection
Ordering Information
Devices
B29150T B29151/2/3T B29150S B29151/2/3S B29150J B29151/2/3J
TO-220-3 Package
Package
TO-220-3 TO-220-5 TO-263-3 TO-263-5 LPDD-3 LPDD-5
TO-220-5 Package
Temp.
-40 C to 125 C -40 C to 125 C -40 C to 125 C -40 C to 125 C -40 C to 125 C -40 C to 125 C
TO-263-3 Package
TO-263-5 Package
BAY B29150 1 2 3
BAY B29151/52/53 1 2345
B29151 1) ENABLE 2) INPUT 3) GND 4) OUTPUT 5) FLAG
B29152 1) ENABLE 2) INPUT 3) GND 4) OUTPUT 5) ADJUST
B29153 1) FLAG 2) INPUT 3) GND 4) OUTPUT 5) ADJUST
BAY B29150
BAY
B29151/52/53
B29151 1) ENABLE 2) INPUT 3) GND 4) OUTPUT 5) FLAG
B29152 1) ENABLE 2) INPUT 3) GND 4) OUTPUT 5) ADJUST
B29153 1) FLAG 2) INPUT 3) GND 4) OUTPUT 5) ADJUST
VIN
GND V OUT
Front View
Top View
1 2 34 5 VIN GND VOUT
Top View
Front View
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B29150
ABSOLUTE MAXIMUM RATINGS
Lead Temp. (Soldering, 5 Seconds) ................................ 260C Storage Temperature Range .............................. -65 to +150C Operating Junction Temperature Range B29150/51/52/53 Control Section ............. -45C +125C B29150/51/52/53 Power Transistor ............-45C +150C Input Voltage........................................................ 26V Maximum Output Current ................................... 3.5A Input Supply Voltage (Note1) (Survival)-20V to +60V
ELECTRICAL CHARACTERISTICS (NOTE 1) at IOUT = 10mA, Ta=25C, unless otherwise specified.
PARAMETER
2.5V Version
CONDITIONS
IOUT = 10mA 10mA IOUT1.5A, 4.75VVIN 26V IOUT = 10mA 10mA IOUT1.5A, 4.75VVIN 26V IOUT = 10mA 10mA IOUT1.5A, 5.5VVIN 26V IO = 10mA, (VOUT + 1V) VIN 26V VIN = VOUT + 5V, 10mA IOUT IFULLLOAD (Note 2, 6) Output Voltage (Note 6) Temperature Coef.
Typ
2.5 2.5 3.3 3.3 5.0 5.0 0.06 0.2 20 80 220 350 8 25 0.9 1.7 400 260 1.240
B29150/51/52/53 Min Max
2.475 2.450 3.267 3.234 4.95 4.90 2.525 2.550 3.330 3.366 5.05 5.10 0.5 1 100 200
Units
V
Output Voltage (Note 2)
3.3V Version2.
Output Voltage (Note 2)
5.0V Version
V
Output Voltage (Note 2)
All Voltage Options
V
Line Regulation Load Regulation V T Dropout Voltage
% % ppm/C mV
IO = 100mA IO = 750mA IO = 1.5A
600 20 mA mA 1.5 A V RMS
Ground Current IGNDDO Ground Pin Current at Dropout Current Limit Output Noise Voltage (10Hz to 100kHz) IL = 100mA Reference Voltage Reference Voltage Adjust Pin Bias Current Reference Voltage Temperature Coefficient Adjust Pin Bias Current Temperature Coefficient Output Leakage Current Output Low Voltage
IO = 750mA, VIN = VOUT, +1V IO = 1.5A
VIN = 0.5V less than specified VOUT IOUT = 10mA VOUT = 0V (Note 4) CL = 10F CL = 33F
1.228 1.215 1.203
1.252 1.265 1.277 80 120
V V nA ppm/C
(Note 8) 40 (Note 7) 20
0.1
nA/C
Flag Output (Error Comparator) B29152/53
VOH = 26V Device set for 5V. VIN = 4.5V IOL = 250A 0.01 220 1.00 2.00 300 400 A mV
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B29150
Upper Threshold Voltage Lower Threshold Voltage Hysteresis
Device set for 5V (Note 9) Device set for 5V (Note 9) Device set for 5V (Note 9) 60 75 15 40 25 95 140 mV mV mV V 0.8 2.4 VEN = 26V VEN = 0.8V 100 600 750 2.5 5 500 V A A
ENABLE Input B29152/53
Input Logic Voltage Low (OFF) High (ON)
Enable Pin Input Current Regulator Output Current in Shutdown
(Note 10)
10
NOTES:
The Bold specifications apply to the full operating temperature range. Note 1: Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle.) The maximum continuous supply voltage is 16V. Note 2: Full load current (IFL) is defined as 1.5A for the B29150/51/52/53. Note 3: Dropout voltage is defined as the input-to output differential when the output voltage drops to 99% of its nominal value with VOUT + 1V applied to VIN. Note 4: VIN = VOUT (NOMINAL) +1V. For example, use VIN= 4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise. Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground current. Note 6: Output voltage temperature coefficient is defined as the worst case voltage changed divided by the total temperature range. Note 7: Thermal regulation is defined as the change in the output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 200mA load pulse as VIN = 20V (a 4W pulse) for T = 10ms. Note 8: VREF VOUT (VIN - 1), 2.3V VIN 16V, 10mA < IL IFL, TJ TJMAX Note 9: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured 6V input. To express these thresholds in terms of output voltage change, multiply the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmable output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 38mV. Threshold remains constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed. Note 10: VEN 0.8V and VIN 16V, VOUT = 0.
BLOCK DIAGRAM
IN
OUT
O.V ILIMIT
FLAG
+
1.180V
Reference
1.240V
+
28V
R1*
-
ADJ
EN
Thermal Shutdown
R2*
GND
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B29150
APPLICATION HINTS
The Bay Linear B29150/51/52/53 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. However, the use of an output capacitor is required in order to insure the stability and the performances.
Minimum Load Current
To ensure a proper behavior of the regulator at light load, a minimum load of 5mA for B29150/51/52/53 is required.
Adjustable Regulator Design
B29152/53 are adjustable regulators and maybe programmed for any value between 1.25V and 16V using two resistors. The relation between the resistors is given by: R1=R2 (VOUT/1.240 -1) Resistors have a large value up to 1m in order to reduce the current consumption. This might be interesting in the case of widely varying load currents.
Thermal Consideration
Although the B29150/51/52/53 offers limiting circuitry for overload conditions, it is necessary not to exceed the maximum junction temperature, and therefore to be careful about thermal resistance. The heat flow will follow the lowest resistance path, which is the Junctionto-case thermal resistance. In order to insure the best thermal flow of the component, a proper mounting is required. Note that the case of the device is electrically connected to the output. The case has to be electrically isolated, a thermally conductive spacer can be used. However do not forget to consider its contribution to thermal resistance. Assuming: VIN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 90C, CASE= 1C/W (no external heat sink, no wind) Power dissipation under these conditions PD = (VIN - VOUT) * IOUT = 7.5W Junction Temperature TJ = TA + PD * (CASE+ JC) For the Control Section TJ = 90C + 7.5W*(1C/W + 0.6C/W) = 102C 114C < TJUNCTION MAX for the control section. For the Power Section TJ = 90C + 7.5W*(1C/W + 1.6C/W) = 104.5C 109.5C < TJUNCTION MAX for the power transistor. In both case reliable operation is insured by adequate junction temperature.
Error Flag
B29152/53 features an error indicating either an over current fault or a low input voltage. This flag pulls low when such a problem occurs and may sink 10mA. It is inoperative during thermal shutdown.
Enable Input
B29152/53 features enable input allowing turning ON & OFF the device. EN has been designed to be compatible with TTL/CMOS logic. When the regulator is ON, the current flowing through this pin is approximately 20A.
VIN
BAY B29150
V OU
T
Fig.1 Basic Fixed Output Regulator
Capacitor Requirements
The output capacitor is needed for stability and to minimize the output noise. The required value of the capacitor varies with the load. However, a minimum value of 10F Aluminum will guarantee stability over load. A tantalum capacitor is recommended for a fast load transient response. If the power source has high AC impedance, a 0.1F capacitor between input & ground is recommended. This capacitor should have good characteristics up to 250 kHz.
1 2 4 5
VIN
BAY B29152
3
VOUT R1
VOUT = VREF X [1 + (R 1/ R2)]
For best results, the total series resistance should be small enough to pass the minimum regulator load current
R2
Fig. 2 Adjustable Output Voltage Regulator
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B29150
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) 989-7144, Fax: (925) 940-9556
www.baylinear.com

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