TECHNICAL DATA
2011, February, Rev. 02
DC-TO-DC CONVERTER CONTROL CIRCUITS
The IL34063A is a 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 specifically designed to be incorporated in Step-Down and Step-Up and Voltage-Inverting applications
with a minimum number of external components.
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Operation from 3.0 V to 40 V Input
Low Standby Current
Current Limiting
Output Switch Current to 1.5 A
Output Voltage Adjustable
Frequency Operation to 100 kHz
Precision 2% Reference
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage
V
CC
40
Vdc
Comparator Input Voltage Range
V
IR
-0.3 to +40
Vdc
Switch Collector Voltage
V
C(switch)
40
Vdc
Switch Emitter Voltage (Vpin 1 = 40 V)
V
E(switch)
40
Vdc
Switch Collector to Emitter Voltage
V
CE(switch)
40
Vdc
Driver Collector Voltage
I
C(driver)
40
Vdc
Driver Collector Current (Note 1)
I
C(driver)
100
mA
Switch Current
I
SW
1.5
A
Power Dissipation and Thermal Characteristics
DIP Package, N Suffix T
A
= +25°C
Thermal Resistance
SOP Package, D Suffix TA = +25°C
Thermal Resistance
P
D
R
JA
P
D
R
JA
1.25
100
625
160
W
°C/W
mW
°C/W
Operating Junction Temperature
TJ
+150
°C
Operating Ambient Temperature Range
T
A
0 to +70
°C
Storage Temperature Range
Tstg
-65to+150
°C
* Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other conditions beyond those
indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
IL34063A
IL34063A
2011, February, Rev. 02
ORDERING INFORMATION
Device
Package
Packing
IL34063AD
SOP-8
Tube
IL34063ADT
SOP-8
Tape & Reel
IL34063AN
DIP-8
Tube
ELECTRICAL CHARACTERICISTICS
(V
CC
= 5.0 V, T
A
= 0 to +70
o
C unless otherwise specified.)
Characteristics
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency (V
Pin 5
= 0 V, C
T
= 1.0 nF, T
A
= 25°C)
fosc
24
33
42
kHz
Charge Current (V
CC
= 5.0 V to 40 V, T
A
= 25°C)
Ichg
24
33
42
A
Discharge Current (V
CC
= 5.0 V to 40 V, T
A
= 25°C)
Idischg
140
200
260
A
Discharge to Charge Current Ratio (Pin7 to Vcc, T
A
=25°C)
Idischg/Ichg
5.2
6.2
7.5
—
Current Limit Sense Voltage (Ichg = Idischg, T
A
= 25°C)
Vipk(sense)
250
300
350
mV
OUTPUT SWITCH (Note 3)
Saturation Voltage, Darlington Connection (I
SW
= 1.0 A, Pins 1, 8
connected)
V
CE
(sat)
—
1.0
1.3
V
Saturation Voltage (I
SW
= 1.0 A, R
Pin 8
= 82 to V
CC
.
Forced = 20)
V
CE
(sat)
—
0.45
0.7
V
DC Current Gain (I
SW
= 1.0 A, V
CE
=
5.0 V, T
A
= 25°C)
h
FE
50
120
—
—
Collector Off-State Current (V
CE
= 40V)
I
C
(off)
—
0.01
100
A
COMPARATOR
Threshold Voltage (T
A
= 25°C)
(T
A
= T
LOW
to T
HIGH
)
Vth
1.225
1.21
1.25
—
1.275
1.29
V
Threshold Voltage (T
A
= 25°C) **
Vth
1.2375
1.25
1.2625
V
Threshold Voltage Line Regulation (V
CC
= 3 0 V to 40 V)
Regline
1.4
5.0
mV
Input Bias Current (Vin=0V)
I
IB
—
-40
-400
nA
TOTAL DEVICE
Supply Current (V
CC
= 5 0 V to 40 V, C
T
= 1 0 nF, V
pin7
= V
CC
.
V
Pin5
> Vth, Pin 2 = Gnd, Remaining pins open)
I
CC
2.5
4.0
mA
NOTES:
1. Maximum package power dissipation limits must be observed.
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 configuration) at low switch currents (< 300 mA) and high
driver currents (>30 mA), it may take up to 2.0 s 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
Forced of output switch = I
C
, output/(Ic, driver -7.0 mA*) > 10
*The 100 . resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts
**Possible version for shipment
Pin connection