IP35063
IP33063
IP34063
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
TOP VIEW
J Package 8 Pin Ceramic DIP
N Package 8 Pin Plastic DIP
D-8 Package 8 Pin Plastic (150) SOIC
Part JPack
NPack
D8
Temp.
Number
8 Pin
8 Pin
8 Pin
Range
IP35063
-55 to +125C
IP33063
-40 to +85C
IP34063
0 to +70C
FEATURES
Operation from 2.5 to 40V input
Low Standby Current
Current Limiting
Output switch current of 1.5A
Output voltage adjustable from 1.25 to 40V
Operating frequency from 100Hz to 100kHz
Direct replacement for MC34063/MC34063A
series
Power Supply Voltage
Comparator Input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage
Switch Collector to Emitter Voltage
Driver Collector Voltage
Switch Current
Power Dissipation @ T
amb
= 25C
Ceramic Packages
Plastic Packages
Derate above 25C
Operating Junction Temperature
Ceramic Packages
Plastic Packages
Operating Ambient Temperature Range See Table Above
Storage Temperature Range
+40V
0.3V to +40V
40V
40V
40V
40V
1.5A
1.25W
1W
10mW/C
150C
125C
See Table Above
65 to 150C
ABSOLUTE MAXIMUM RATINGS
1
2
3
4
8
7
6
5
V
C C
SW ITCH
COLLECTOR
SW ITCH
EMITTER
TIM ING
C APACITOR
GND
I
pk SENSE
D RIVER
C OLL EC TO R
C OMP AR ATOR
INVER TIN G
INPUT
DCDC CONVERTER
CONTROL CIRCUIT
Order Information
Note:
To order, add the package identifier to the part
number.
eg.
IP35063D8
IP35063
IP33063
IP34063
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
Parameter
Test Conditions
Min.
Typ.
Max.
Units
20
35
50
150
200
250
0.5
6.0
250
300
350
1
1.3
0.45
0.7
35
120
10
1.18
1.25
1.32
0.04
0.2
40
400
2.4
3.5
Charging Current
Discharge Current
Voltage Swing
Discharge to Charge Current Ratio
Current Limit Sense Voltage
Saturation Voltage, Darlington Connection *
Saturation Voltage *
DC Current Gain
Collector OffState Current
Threshold Voltage *
Threshold Voltage Line Regulation *
Input Bias Current *
Supply Current *
V
CC
= 5 to 40V
V
CC
= 5 to 40V
I
pk(sense)
= V
CC
I
chg
= I
dischg
I
SW
= 1.0A
I
SW
= 1.0A
I
C(Driver)
= 50mA (Forced
= 20)
I
SW
= 1.0A , V
CE
= 5.0V
V
CE
= 40V
V
CC
= 3 to 40V
V
IN
= 0V
V
CC
= 5 to 40V
C
T
= 0.001
F
I
pk(sense)
= V
CC
V
PIN 5
> V
th
Pin 2 = Gnd , Remaining Pins Open.
A
A
Vpp
--
mV
V
V
--
nA
V
mV/V
nA
mA
ELECTRICAL CHARACTERISTICS
(Test Parameters unless otherwise stated : V
CC
= 5V , T
J
= 25C)
OUTPUT SWITCH
COMPARATOR
TOTAL DEVICE
OSCILLATOR
NOTES
* Applies over full operating temperature range (see order information).
1.25 V
REFERENCE
REGULATOR
COMPARATOR
OSCILLATOR
S
R
Q
8
7
6
5
1
2
3
4
Q1
Q2
170
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
Driver
Collector
I Sense
pk
V CC
Comparator
Inverting
Input
DESCRIPTION
The IP34063 series of control circuits contains all the
functions required to implement DCDC converters.
Included are internal voltage reference, comparator,
controlled duty cycle oscillator with current limit circuit,
driver, and high current output switch. This series was
specifically designed to be incorporated in Step-Down
(Buck) and Step-Up (Boost) applications with a minimum
number of external components.
IP35063
IP33063
IP34063
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
t
ON
t
OFF
(t
ON
+ t
OFF
)
MAX
C
T
I
pk(switch)
R
SC
L
(MIN)
C
O
V
OUT
+ V
F
V
IN(MAX)
- V
SAT
- V
OUT
1
f
MIN
4 x 10
-5
t
ON
2 I
OUT(MAX)
0.33 / I
pk(switch)
V
IN(MAX)
- V
SAT
- V
OUT
t
ON(MAX)
I
pk(switch)
I
pk(switch)
(t
ON
+ t
OFF
)
8 V
ripple(pp)
V
OUT
+ V
F
- V
IN(MIN)
V
IN(MIN)
- V
SAT
1
f
MIN
4 x 10
-5
t
ON
t
ON
+ t
OFF
2 I
OUT(MAX)
t
OFF
0.33 / I
pk(switch)
V
IN(MIN)
- V
SAT
t
ON(MAX)
I
pk(switch)
I
OUT
t
ON
V
ripple
DESIGN FORMULA TABLE
Calculation
StepDown
StepUp
KEY
V
SAT
-- Saturation voltage of the output switch.
V
F
-- Forward voltage drop of the ringback rectifier.
The following power supply characteristics must be chosen:
V
IN
-- Nominal input voltage. If this voltage is not constant, then use V
IN(MAX)
for stepdown and V
IN(Min)
for
stepup converter.
R2
V
OUT
-- Desired output voltage, V
OUT
= 1.25 1 + .
R1
I
OUT
-- Desired output current.
f
MIN
-- Minimum desired output switching frequency at the selected values for V
IN
and I
O
.
V
ripple(pp)
-- Desired peaktopeak output ripple voltage. In practice, the calculated value will need to be increased
due to the capacitors equivalent series resistance and board layout. The ripple voltage should be kept to a
low value since it will directly affect the line and load regulation.
( )
IP35063
IP33063
IP34063
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
APPLICATIONS INFORMATION
1.25 V
REFERENCE
REGULATOR
COMPARATOR
OSCILLATOR
S
R
Q
8
7
6
5
1
2
3
4
Q1
Q2
170
1.25 V
REFERENCE
REGULATOR
COMPARATOR
OSCILLATOR
S
R
Q
8
7
6
5
1
2
3
4
Q1
Q2
170
Ip k
VCC
R 1
2 . 2 K
R 2
4 7 K
2 8 V
1 7 5 m A
VOUT
1500
F
100
F
0.22
1 2 V
VIN
1 8 0
L 170
H
1N5819
R SC
C O
1 5 0 0 p F
C T
C T
R1
1.2K
R2
3.3K
470pF
C T
100
F
0.33
L
220
H
1N5822
Ipk
Q1
Q2
VCC
5.0V
500mA
VOUT
25V
VIN
470
F
C O
R SC
C T
StepDown Converter
StepUp Converter
1.25 V
REFERENCE
REGULATOR
COMPARATOR
OSCILLATOR
S
R
Q
8
7
6
5
1
2
3
4
Q1
Q2
170
1.25 V
REFERENCE
REGULATOR
COMPARATOR
OSCILLATOR
S
R
Q
8
7
6
5
1
2
3
4
Q1
Q2
170
VIN
R SC
VOUT
VIN
R SC
VOUT
StepDown, External NPN Switch
StepUp, External NPN Switch
1.2 5 V
R EF ER EN C E
RE G UL AT O R
C O M PA RA TO R
O S CILLA TO R
S
R
Q
Q1
Q 2
170
8
7
6
5
1
2
3
4
1 .25 V
R EF ER EN CE
RE G UL ATO R
C O M PA RA TO R
O SC ILL AT O R
S
R
Q
Q 1
Q2
1 70
8
7
6
5
1
2
3
4
VIN
R S C
V O U T
V IN
RSC
VO U T
R 0 F O R
C O NS TA NT V IN
StepDown, External PNP Saturated Switch
StepUp, External NPN Saturated Switch
External Current Boost Connections for I
C
> 1.5A
IP35063
IP33063
IP34063
Semelab plc.
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
TYPICAL PERFORMANCE CHARACTERISTICS
0 .5
0 .2
5
2
5 0
1 0 0
2 0
1
1 0
0 . 1
5 0
1 0 0
2 0
5
1 0
1
2
5 0 0
1 0 0 0
2 0 0
OSCILLATOR TIMING CAPACITOR (nF)
C
T
O
U
T
P
U
T
S
W
IT
C
H
O
N
O
F
F
T
I
M
E
(
s)
V = 5V
CC
pk(sense)
I = V
CC
Pin 5 = Gnd
t
on
t
off
Output Switch OnOff Time
vs Oscillator Timing Capacitor
Standby Supply Current
vs Supply Voltage
SU
PPL
Y
CUR
R
E
NT (
m
A)
I
CC
4 0
0
0
3 .2
2 .4
1 .6
0 .8
5
1 0
2 5
3 0
3 5
1 5
2 0
SUPPLY VOLTAGE (V)
V
CC
Pin 2 = Gnd
pk(sense)
I = V
CC
C = 0.001
F
T
1 .2
1 .3
1 .5
1 .4
1 .6
1 .1
1 .0
0
0 . 2
0 .4
0 .6
0 .8
1 . 0
1 .2
1 .4
SATUR
ATI
O
N
V
O
L
T
AG
E
(
V
)
V
CE
(
s
a
t
)
EMITTER CURRENT (A)
I
E
V = 5V
CC
Pin 3,5 = Gnd
Pin 1,7,8 = V
CC
EmitterFollower Configuration
Output Switch Saturation Voltage
vs Emitter Current
CommonEmitter Configuration
Output Switch Saturation Voltage
vs Collector Current
SATUR
ATI
O
N V
O
L
T
AG
E
(
V
)
V
CE
(
s
a
t
)
COLLECTOR CURRENT (A)
I
C
0 .4
0 .6
1 .0
0 .8
1 .2
0 .2
0
0
0 .2
0 .4
0 . 6
0 .8
1 .0
1 .2
1 . 4
V = 5V
CC
Pin 2,3,5 = G nd
Pin 7 = V
CC
DARLINGTON CONNECTION
F ORCED
= 20
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