@vic
AV34063
Copyright Avic Electronics Corp.
1
Website:
http://www.avictek.com
1.5A,Step-Up/Down Inverting Switching Regulators
DESCRIPTION
The AV34063 is a monolithic control circuit containing the
primary functions required for DC-to-DC converters. This device
consists of an internal temperature compensated reference,
comparator, controlled duty cycle oscillator with an active current
limit circuit,driver and high current output switch. This device was
specifically designed to be incorporated in Step-Down and Step-Up
and Voltage-inverting applications with a minimum number of
external components.
FEATURES
Operation from 3.0 to 40V input
Low standby current
Current limiting
Output switch current of 1.5A
Output voltage adjustable
Frequency of operation from 100Hz to 100KHz
Precision 2% reference
BLOCK DIAGRAM
ORDERING INFORMATION
Part Number
Operating Temperature Range
Package Type
AV34063
0~+70
DIP-8
AV34063S
0~+70
SOP-8
DIP-8
SOP-8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
Comparator
Inverting
Input
V
CC
I
PK
Sense
Drive
Collector
(Bottom View)
(Top View)
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
Comparator
Inverting
Input
V
CC
I
PK
Sense
Drive
Collector
S Q
R
Q2
Q1
100
C
T
I
PK
Oscillalo
Comparator
1.25
Reference
Regulator
@vic
AV34063
Copyright Avic Electronics Corp.
2
Website:
http://www.avictek.com
MAXIMUM RATING
Characteristic
Symbol
Value
Unit
Power Supply Voltage
V
CC
40
Comparator Input Voltage Range
V
IR
-0.3 to +40
Switch Collector Voltage
V
C(switch)
40
Switch Emitter Voltage (V
PIN1
=40V)
V
E(switch)
40
Switch Collector toEmitter Voltage
V
CE(switch)
40
Driver Collector Voltage
V
C(driver)
40
V
Driver Collector Current (Note1)
I
C(driver)
100 mA
Switch Current
I
SW
1.5
A
Power Dissipation and Thermal Charcteristics
Plastic Package T
A
=25
Thermal Resistance
SOIC Package T
A
=25
Thermal Resistance
P
D
R
JA
P
D
R
JA
1.25
100
0.625
100
W
/
W
W
/
W
Operating Juncton Temperature
T
J
+150
Operating Ambient Temperature Range
T
A
0 to +70
Storage Temperature Range
T
stg
-60~150
Notes: 1. Maximum package power dissipation limits must be observed.
2.ESD data available upon request.
@vic
AV34063
Copyright Avic Electronics Corp.
3
Website:
http://www.avictek.com
ELECTRICAL CHARACTETRISTICS
(V
CC
=5.0V,T
A
=T
low
to T
high
[Note1],unless otherwise specified.)
Characteristics
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency(V
pin5
=0V, C
T
=1.0nF, T
A
=25 )
F
OSC
24 33 42 KHz
Charge Current (V
CC
=5.0V to 40V, T
A
=25 )
I
chg
24 35 42 A
Discharge Current (V
CC
=5.0V to 40V, T
A
=25 )
I
dischg
140 220 260 A
Discharge to Charge Current Ratio (Pin 7 to V
CC,
T
A
=25 )
I
dischg/
I
chg
5.2 6.5 7.5 -
Current Limit Sense Voltage (I
chg=
I
dischg,
T
A
=25 )
V
ipk(sence)
250 300 350 mV
OUTPUT SWITCH (NOTE 2)
Saturation Voltage, Darlington Connection (Note 3)
(I
SW
=1.0A, Pins 1,8 connected)
V
CE(sat)
-
1.0
1.3
V
Saturation Voltage, Darlington Connection
(I
SW
=1.0A, R
pin8
=82 to V
CC,
Forced 20)
V
CE(sat)
-
0.45
0.7
V
DC Current Gain (I
SW
=1.0A,
V
CE
=5.0V
,
T
A
=25 )
H
EF
50
75
-
-
Collector Off-State Current (
V
CE
=40V
)
I
C(Off)
-
0.01
100
A
COMPARATOR
Threshold Voltage
(T
A
=25 )
(T
A
= T
low
to T
high
)
V
th
1.238
1.225
1.25
-
1.262
1.275
V
Threshold Voltage Line Regulation (V
CC
=3.0V to 40V)
Reg
line
-
1.4
5.0
mV
Input Bias Current (V
in
=0V)
I
IB
-
-20
-400
nA
TOTAL DEVICE
Supply Current ((V
CC
=5.0V to 40V, C
T
=1.0nF, (Pin 7 to
V
CC,
(Pin 5>
V
th
,
(Pin 2=Gnd, remaining pins open)
I
CC
-
-
4.0
mA
Notes: 1. T
low
=0 T
high
=+70
2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close
to ambient temperature as possible.
3. If the output switch is driven into hard saturation (non-Darlington) 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 30KHz, and is magnified at
high temperature. 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 :
Forced of output switch : ( I
C
output/( I
C
driver - 7.0mA)
10 )
*The 100 resister in the emitter of the driver device requires about 7.0mA before the output
switch conducts.
@vic
AV34063
Copyright Avic Electronics Corp.
4
Website:
http://www.avictek.com
Typical Characteristics
I
C
, COLLECTOR CURRENT(A)
T on-off output switch on-off time (s)
1000
500
200
100
50
20
10
5.0
2.0
1.0
0.01 0.02 0.05
0.2
0.1
0.5 1.0 2.0 5.0 10
Figure 1. Output Switch OnOff Time versus
Oscillator Timing Capacitor
C
T
, OSCILLATOR TIMING CAPACITOR (nF)
Figure2. Timing Capacitor Waveform
V
CC
=5V
Pin7=VCC
Pin5=Gnd
T
A
=25
t
on
t
off
V
CC
=5V
Pin7=VCC
Pin2=Gnd
Pins1,5,8=open
C
T
=1.0nF
T
A
=25
V
OS
C
, OS
CILLATOR VOLTAGE (V)
10 s/DIV
200 mV/DIV
V
CESA
T
,
SATURATION VOLTAGE (V)
1.8
1.7
1.6
15
1.4
1.3
1.2
1.1
1.0
0.2
0
0.4
06 0.8 1.0 1.2 1.4 1.6
V
CC
=5V
Pin1,7,8=V
CC
Pin3,5=Gnd
T
A
=25
(See Note 4)
V
CC
=5V
Pin7=V
CC
Pin2,3,5=Gnd
T
A
=25
(See Note 4)
Forced 20
Darlington Connection
V
CESA
T
,
SATURATION VOLTAGE (V)
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.2 0.4
0.6
0
0.8 1.0 1.2
1.4 1.6
I
E
, EMITTER CURRENT (A)
Figure 3. Emitter Follower Configuration Output
Saturation Voltage versus Emitter
C
t
Figure 4. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
V
IP
K
(
S
e
n
s
e
)
, CURRENT LIMIT S
E
NS
E
VOLTAGE (V))
I
CC
,
SUPPLY CURRENT (mA)
400
380
360
340
320
300
280
260
240
220
200
-55 -25
0
25
50
75
100 125
V
CC
=5V
I
chg
=I
disch
C
T
=1.0nF
Pin7=VCC
Pin2=Gnd
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
0
5.0 10 15
25
20
30
35 40
T
A
, AMBIENT TEMPERATURE (C)
V
CC
, SUPPLY VOLTAGE (V)
Figure 5. Current Limit Sense Voltage
versus Temperature
Figure 6. Standby Supply Current versus
Supply Voltage
@vic
AV34063
Copyright Avic Electronics Corp.
5
Website:
http://www.avictek.com
Test
Conditions
Results
Line Regulation
Vin = 8.0 V to 16 V, I
O
= 175 mA
30 mV = 0.05%
Load Regulation
Vin = 12 V, I
O
= 75 mA to 175 mA 10 mV = 0.017%
Output Ripple
Vin = 12 V, I
O
= 175 mA
400 mVpp
Effciency
Vin = 12 V, I
O
= 175 mA
87.7%
Output Ripple With Optional Filter Vin = 12 V, I
O
= 175 mA
40 mVpp
Q2
Q1
S
R
Q
1
2
3
4
5
6
7
8
180
I
P
OSC
C
T
V
CC
V
OUT
Comp.
1.25V
Ref
Reg
170H
1N5819
C
T
1500pF
100
R
SC
0.22
L
R
1
2.2K
R
2
47K
C
O
330
V
OUT
28V/175mA
1.0H
100
Optional Filter
Figure 7. StepUp Converter
8a. External NPN Switch 8b. External NPN Saturated Switch
Figure 8. External Current Boost Connections for I
C
Peak Greater than 1.5 A
V
OUT
V
OUT
1
1
2
2
6
7
8
8
7
6
R
SC
R
SC
Vin
Vin
R 0 for
constant Vin
PDF 
ZIP