SLS SL34063AD, SL34063AP1 Datasheet
1
System Logic
Semiconductor
SLS
DC-TO-DC CONVERTER CONTROL CIRCUITS
The SL34063A 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 VCC 40 Vdc
Comparator Input Voltage Range VIR -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 ISW 1.5 A
Power Dissipation and Thermal Characteristics
Ceramic Package, U Suffix T
A
= +25°C
Thermal Resistance
Plastic Package, P Suffix T
A
= +25°C
Thermal Resistance
SOIC Package, D Suffix TA = +25°C
Thermal Resistance
PD
R
θJA
P
D
R
θJA
PD
R
θJA
1.25
100
1.25
100
625
160
W
°C/W
W
°C/W
mW °C/
W
Operating Junction Temperature TJ +150 °C
Operating Ambient Temperature Range TA 0 to +70 °C
Storage Temperature Range Tstg -65to+150 °C
SL34063A
2
System Logic
Semiconductor
SLS
SL34063A
ORDERING INFORMATION
Device Temperature Range Package
34063AD 0° to +70°C SO-8
34063AP1 Plastic DIP
ELECTRICAL CHARACTERICISTICS
(V
CC
= 5.0 V, T
A
= 0 to +70oC unless otherwise specified.)
Characteristics Symbol Min Typ Max Unit
OSCILLATOR
Frequency (V
Pin 5
= 0 V, C
T
= 1.0 nF, TA = 25°C) fosc 24 33 42 kHz
Charge Current (V
CC
= 5.0 V to 40 V, TA = 25°C) Ichg 24 33 42 µA
Discharge Current (V
CC
= 5.0 V to 40 V, TA = 25°C) Idischg 140 200 260 µA
Discharge to Charge Current Ratio (Pin7 to Vcc, TA=25°C)
Idischg/Ichg 5.2 6.2 7.5 —
Current Limit Sense Voltage (Ichg = Idischg, T
A
= 25°C)
Vlpk(sense) 250 300 350 mV
OUTPUT SWITCH (Note 3)
Saturation Voltage, Darlington Connection (ISW = 1.0 A,
Pins 1, 8 connected)
VCE(sat) — 1.0 1.3 V
Saturation Voltage (ISW = 1.0 A, R
Pin 8
= 82 Ω to VCC.
Forced β = 20)
VCE(sat) — 0.45 0.7 V
DC Current Gain (ISW = 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 µA
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)
Regime 1.4 5.0 mV
Input Bias Current (Vin=0V)
IIB — -40 -400 nA
TOTAL DEVICE
Supply Current (V
CC
= 5 0 V to 40 V, CT = 1 0 nF, V
pin7
= VCC.
V
Pin5
> Vth, Pin 2 = Gnd, Remaining pins open)
ICC
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 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 Darlingto n 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 Ω. resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts
**Possible version for shipment
Pin connection
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