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ETC
ETC

34063AP1 Datasheet

DC-TO-DC CONVERTER CONTROL CIRCUITS


34063AP1 Datasheet Preview


34063A
DC-TO-DC CONVERTER CONTROL CIRCUITS
The 34063A 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
Power Supply Voltage
Comparator Input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage (Vpin 1 = 40 V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
Driver Collector Current (Note 1)
Switch Current
Power Dissipation and Thermal Characteristics
Ceramic Package, U Suffix TA = +25°C
Thermal Resistance
Plastic Package, P Suffix TA = +25°C
Thermal Resistance
SOIC Package, D Suffix TA = +25°C
Thermal Resistance
Operating Junction Temperature
Operating Ambient Temperature Range
Storage Temperature Range
Symbol
VCC
VIR
VC(switch)
VE(switch)
VCE(switch)
IC(driver)
IC(driver)
ISW
PD
RθJA
PD
RθJA
PD
RθJA
TJ
TA
Tstg
Value
40
-0.3 to
+40
40
40
40
40
100
1.5
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
mA
A
1.25 W
100 °C/W
1.25 W
100 °C/W
625 mW
160 °C/W
+150
°C
0 to +70 °C
-65to+150 °C
Page 1

ORDERING INFORMATION
Device Temperature
Range
34063AD 0° to +70°C
34063AP1
Package
SO-8
Plastic DIP
Pin connection
ELECTRICAL CHARACTERICISTICS
(VCC = 5.0 V, TA= 0 to +70oC unless otherwise specified.)
Characteristics
Symbol
Min
OSCILLATOR
Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C)
fosc
24
Charge Current (VCC = 5.0 V to 40 V, TA = 25°C)
Ichg
24
Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C)
Idischg
140
Discharge to Charge Current Ratio (Pin7 to Vcc, TA=25°C) Idischg/Ichg
5.2
Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C)
Vlpk(sense) 250
OUTPUT SWITCH (Note 3)
Saturation Voltage, Darlington Connection (ISW = 1.0 A,
Pins 1, 8 connected)
VCE(sat)
Saturation Voltage (ISW = 1.0 A, RPin 8 = 82 to VCC.
Forced β = 20)
DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C)
Collector Off-State Current (VCE = 40V)
VCE(sat)
hFE
IC(off)
50
COMPARATOR
Threshold Voltage (TA = 25°C)
(TA = TLOW to THIGH)
Vth 1.225
1.21
Threshold Voltage (TA = 25°C) **
Vth 1.2375
Typ
33
33
200
6.2
300
1.0
0.45
120
0.01
1.25
1.25
Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V) V REG line
Input Bias Current (Vin=0V)
IIB
TOTAL DEVICE
Supply Current (VCC = 5 0 V to 40 V, CT = 1 0 nF, Vpin7 =
VCC. VPin5 > Vth, Pin 2 = Gnd, Remaining pins open)
ICC
1.4
-40
2.5
Max Unit
42 kHz
42 µA
260 µA
7.5 —
350 mV
1.3 V
0.7 V
——
100 µA
1.275 V
1.29
1.2625 V
5.0
-400
mV
nA
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 µs 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 β of output switch = IC, 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
Page 2
Part Number 34063AP1
Manufactur ETC
Description DC-TO-DC CONVERTER CONTROL CIRCUITS
Total Page 2 Pages
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