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 Step-
Down 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
•
•
•
•
•
•
•
•
•
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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
0°C to 70°C
-40°C to 85°C
-40°C to 125°C
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
I
PK
Sense
V
CC
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
V
CC
V
I(COMP)
V
C(SW)
V
E(SW)
V
CE(SW)
V
C(DR)
I
SW
Value
40
-0.3
∼
+ 40
40
40
40
40
1.5
Unit
V
V
V
V
V
V
I
Electrical Characteristics
(V
CC
= 5.0V, T
A
= T
LOW
to T
HIGH
(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
I
CHG
I
DISHG
f
OSC
K
V
SENSE(C.L)
V
CE(SAT)1
V
CE(SAT)2
G
I(DC)
I
C(OFF)
V
TH
∆V
TH
I
BIAS
I
CC
V
VV
=5 to 40V, T
A
= 25
°C
V
CC
= 5 to 40V, T
A
= 25
°C
T
A
= 25
°C
V
7
= V
CC
T
A
= 25
°C
I
CHG
= I
DISCHG,
T
A
= 25
°C
I
SW
= 1.0A, Pins 1, 8 connected
V
C(drive)
= V
C(SW)
I
SW
= 1.0A, V
C(drive)
= 50mA
I
SW
= 1.0A, V
CE
= 5.0V, T
A
= 25
°C
V
CE
= 40V
T
A
= 25
°C
T
A
= T
LOW
to T
high
V
CC
= 3V to 40V
V
I
= 0V
V
CC
= 5V to 40V, C
T
= 0.001µF,
Pin7=V
CC
, V
5
>V
TH
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
µA
µA
kHz
-
mV
V
V
-
µA
V
OUTPUT SWITCH (Note 4)
1.4
1.4
-20
-
mV
nA
mA
Note3:
T
low
= 0
°C
for B34063A, - 40
°C
for B34063AI, AE, T
high
= +70°C for the B34063A, T
high
= +85°C for the B34063AI, +125°C 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
µs
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 non-
Darlington configuration is used the following output drive condition is recommended:
Forces
β
of output switch : Ic output/Ic driver – 7.0mA
≥10
The 100Ω 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
V
IN
= 8.0 V to 16 V, I
O
= 175 mA
V
IN
= 12 V, I
O
= 75 mA to 175 mA
V
IN
= 12 V, I
O
= 175 mA
V
IN
= 12 V, I
O
= 175 mA
V
IN
= 12 V, I
O
= 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
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