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Bay Linear
Inspire the Linear Power
1.5Amp DC-to-DC Converter Control Circuit
B34063A
Description
The Bay Linear B34063A series is monolithic control circuit containing the primary functions required for DC-to-DC converters. These devices consist of an internal temperature compensated reference, comparator, controlled, duty cycle oscillator with an active current limit circuit, driver and high current output switch. This series was specially designed to be incorporated in StepDown and Step-Up and voltage-inverting applications with a minimum number of external component. The B34063A is offer in 8-pin DIP or Surface mount package.
Features
* * * * * * * * *
* * Operation from 3.0V to 40V input Low Standby Current Current Limiting Output Switch Current to 1.5A Output voltage Adjustable Frequency Operation to 100 kHz Precision 2% Reference Step-Up-Step Down or inverting Switching regulator Direct Replacement for MC34063 CD ROM Mother Board SMPS Power Supply
Applications
*
Pin Connection
Ordering Information
SO-8 8-pin
B34063AM B34063AIM B34063AEM
P-DIP 8-pin
B34063AP B34063AIP B34063AEP
Operating Temp. Range
0C to 70C -40C to 85C -40C to 125C
All Marking will be B34063X. The Temperature will be specified in out side Box. X=Package type
8-Pin Surface Mount
Switch Collector Switch Emitter Timing Capacitor GND 1 2 3 4 8 7 6 5 Driver Collector IPK Sense VCC Comparator Inverting Input
Top View
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B34063A
Absolute Maximum Rating
Parameter
Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage Switch Collector to Emitter Voltage Driver Collector Voltage Switch Current
Symbol
VCC VI(COMP) VC(SW) VE(SW) VCE(SW) VC(DR) ISW
Value
40 -0.3 + 40 40 40 40 40 1.5
Unit
V V V V V V I
Electrical Characteristics
(VCC = 5.0V, TA = TLOW to THIGH (Note 3), unless otherwise specified) Parameter Symbol Conditions OSCILATOR
Charging Current Discharging Current Frequesncy Discharge in To Charge Current Ratio Current Limit Sense Voltage Saturation Voltage Darlington Connection Saturation Voltage (Note 5) DC Current Gain Collector off Sate Current COMPARATOR Threshold Voltage Threshold Voltage Line Reg. B34063A, B34063AI B34063AE Input Bias Current TOTAL DEVICE Supply Current ICHG IDISHG fOSC K VSENSE(C.L) VCE(SAT)1 VCE(SAT)2 GI(DC) IC(OFF) VTH VTH IBIAS ICC VVV=5 to 40V, TA = 25 C VCC = 5 to 40V, TA = 25 C TA = 25 C V7 = VCC TA = 25 C ICHG = IDISCHG, TA = 25 C ISW = 1.0A, Pins 1, 8 connected VC(drive) = VC(SW) ISW = 1.0A, VC(drive) = 50mA ISW = 1.0A, VCE = 5.0V, TA = 25 C VCE = 40V TA = 25 C TA= TLOW to Thigh VCC = 3V to 40V VI = 0V VCC = 5V to 40V, CT = 0.001F, Pin7=VCC , V5 >VTH pin2=Gnd, Remaining pins open -
MIN
24 140 24 5.2 250 50 1.225 1.21 -
TYP
35 220 33 6.5 300 1.0 0.45 75 40 1.25
MAX
42 260 42 7.5 350 1.3 0.7 100 1.275 1.29 5.0 6.0 -400 4.0
UNIT
A A kHz mV V V A V
OUTPUT SWITCH (Note 4)
1.4 1.4 -20 -
mV nA mA
Note3: Tlow = 0 C for B34063A, - 40 C for B34063AI, AE, Thigh = +70C for the B34063A, Thigh = +85C for the B34063AI, +125C for the B34063AE Note4: Low Duty cycle pulse techniques are used during test to maintain junction temp. as close to ambient temp. as possible. Note5: If the output switch is driven into hard saturation (non-Darlington configuration) at low switch current (300mA) and high driver currents (30mA). It may take up to 2.0 s for it to come out of saturation. This condition will shorten the off time at frequencies 30 kHz. And is magnified at high temperatures. This condition does not occur with a Darlington configuration. Since the output switch can not saturate. If a nonDarlington configuration is used the following output drive condition is recommended: Forces of output switch : Ic output/Ic driver - 7.0mA 10 The 100 resistor is the emitter of the driver device requires about 7.0 mA before the output switch conducts
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B34063A
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B34063A
Figure 8. Step-Up Converter
Test
Line Regulation Load Regulation Output Ripple Efficiency Output Ripple With Optional Filter
Conditions
VIN = 8.0 V to 16 V, IO = 175 mA VIN = 12 V, IO = 75 mA to 175 mA VIN = 12 V, IO = 175 mA VIN = 12 V, IO = 175 mA VIN = 12 V, IO = 175 mA
Results
30 mV = + 0.05% 10 mV = + 0.01% 400 mVp-p 89.2% 40 mVp-p
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B34063A
Note 7: If the output switch is driven into hard saturation (non- Darlington configuration) at low switch currents (3 300 mA) and high driver currents (. 30 mA), it may take up to 2.0 ms to come out of saturation. This condition will shorten the off time at frequencies . 30 kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non- Darlington configuration is used, the following output drive condition is recommended.
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B34063A
Figure 10. Step-Down Converter
Test
Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Filter
Conditions
VIN = 15 V to 25 V, IO = 500 mA VIN = 25 V, IO = 50 mA to 500 mA VIN = 25 V, IO = 500 mA VIN = 25 V, RL = 0.1 VIN = 25 V, IO = 500 mA VIN = 25 V, IO = 500 mA
Results
12 mV = + 0.12% 3.0 mV = + 0.03% 120 mVp-p 1.1A 83.7% 40 mVp-p
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B34063A
Figure 12. Voltage Inverting Converter
Test
Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Filter
Conditions
VIN = 4.5 V to 6.0 V, IO = 100 mA VIN = 5.0 V, IO = 10 mA to 100 mA VIN = 5.0 V, IO = 100 mA VIN = 5.0 V, RL = 0.1 VIN = 5.0 V, IO = 100 mA VIN = 5.0 V, IO = 100 mA
Results
3 mV = + 0.12% 0.022 mV = + 0.09% 500 mVp-p 910mA 62.2% 70 mVp-p
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B34063A
4.0 (0.158) 3.8 (0.150)
5.2 (0.205) 4.6 (0.181)
6.2 (0.244) 5.8 (0.228)
Pin 1
1.27 (0.50) BSC
1.75 (0.069) 1.35 (0.053) 0.78 (0.031) 0.61 (0.024) 5.0 (0.197) 4.8 (0.188) 0.37 (0.015) BSC 0.77 (0.030) 0.64 (0.025) 7 (4 PLCS)
45
3 -6 0.56 (0.022) 0.49 (0.019) 0.45 (0.018) 0.35 (0.014) 0.20 (0.008) 0.10 (0.004) 0.22 (0.009) 0.19 (0.007) 7 (4 PLCS)
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B34063A
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
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com

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