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 VC(switch) 40 Vdc
Switch Emitter Voltage (Vpin 1 = 40 V) VE(switch) 40 Vdc
Switch Collector to Emitter Voltage VCE(switch) 40 Vdc
Driver Collector Voltage IC(driver) 40 Vdc
Driver Collector Current (Note 1) IC(driver) 100 mA
Switch Current ISW 1.5 A
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

PD
RθJA
PD
RθJA
PD
RθJA

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