The MC33063A and MC34063A devices are easy-to-use ICs containing all the primary circuitry needed for building simple DC-DC converters. These devices primarily consist of an internal temperature-compensated reference, a comparator, an oscillator, a PWM controller with active current limiting, a driver, and a high-current output switch. Thus, the devices require minimal external components to build converters in the boost, buck, and inverting topologies.
The MC33063A device is characterized for operation from –40°C to 85°C, while the MC34063A device is characterized for operation from 0°C to 70°C.
PART NUMBER | PACKAGE (PIN) | BODY SIZE |
---|---|---|
MC3x063A | SOIC (8) | 4.90 mm × 3.91 mm |
SON (8) | 4.00 mm × 4.00 mm | |
PDIP (8) | 9.81 mm × 6.35 mm |
Changes from M Revision (January 2011) to N Revision
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
Switch Collector | 1 | I/O | High-current internal switch collector input. |
Switch Emitter | 2 | I/O | High-current internal switch emitter output. |
Timing Capacitor | 3 | — | Attach a timing capacitor to change the switching frequency. |
GND | 4 | — | Ground |
Comparator Inverting Input | 5 | I | Attach to a resistor divider network to create a feedback loop. |
VCC | 6 | I | Logic supply voltage. Tie to VIN. |
IPK | 7 | I | Current-limit sense input. |
Driver Collector | 8 | I/O | Darlington pair driving transistor collector input. |
MIN | MAX | UNIT | |||
---|---|---|---|---|---|
VCC | Supply voltage | 40 | V | ||
VIR | Comparator inverting input voltage range | –0.3 | 40 | V | |
VC(switch) | Switch collector voltage | 40 | V | ||
VE(switch) | Switch emitter voltage | VPIN1 = 40 V | 40 | V | |
VCE(switch) | Switch collector to switch emitter voltage | 40 | V | ||
VC(driver) | Driver collector voltage | 40 | V | ||
IC(driver) | Driver collector current | 100 | mA | ||
ISW | Switch current | 1.5 | A | ||
TJ | Operating virtual junction temperature | 150 | °C | ||
Tstg | Storage temperature range | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) | 2500 | V |
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) | 1500 |
MIN | MAX | UNIT | |||
---|---|---|---|---|---|
VCC | Supply voltage | 3 | 40 | V | |
TA | Operating free-air temperature | MC33063A | –40 | 85 | °C |
MC34063A | 0 | 70 |
THERMAL METRIC(1) | MC33063A | UNIT | |||
---|---|---|---|---|---|
D | DRJ | P | |||
8 PINS | |||||
RθJA | Junction-to-ambient thermal resistance | 97 | 41 | 85 | °C/W |
PARAMETER | TEST CONDITIONS | TA | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|---|
fosc | Oscillator frequency | VPIN5 = 0 V, CT = 1 nF | 25°C | 24 | 33 | 42 | kHz |
Ichg | Charge current | VCC = 5 V to 40 V | 25°C | 24 | 35 | 42 | μA |
Idischg | Discharge current | VCC = 5 V to 40 V | 25°C | 140 | 220 | 260 | μA |
Idischg/Ichg | Discharge-to-charge current ratio | VPIN7 = VCC | 25°C | 5.2 | 6.5 | 7.5 | — |
VIpk | Current-limit sense voltage | Idischg = Ichg | 25°C | 250 | 300 | 350 | mV |
PARAMETER | TEST CONDITIONS | TA | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|---|
VCE(sat) | Saturation voltage – Darlington connection |
ISW = 1 A, pins 1 and 8 connected | Full range | 1 | 1.3 | V | |
VCE(sat) | Saturation voltage – non-Darlington connection(2) |
ISW = 1 A, RPIN8 = 82 Ω to VCC, forced β ∼ 20 |
Full range | 0.45 | 0.7 | V | |
hFE | DC current gain | ISW = 1 A, VCE = 5 V | 25°C | 50 | 75 | — | |
IC(off) | Collector off-state current | VCE = 40 V | Full range | 0.01 | 100 | μA |
PARAMETER | TEST CONDITIONS | TA | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|---|
Vth | Threshold voltage | 25°C | 1.225 | 1.25 | 1.275 | V | |
Full range | 1.21 | 1.29 | |||||
ΔVth | Threshold-voltage line regulation | VCC = 5 V to 40 V | Full range | 1.4 | 5 | mV | |
IIB | Input bias current | VIN = 0 V | Full range | –20 | –400 | nA |
PARAMETER | TEST CONDITIONS | TA | MIN | MAX | UNIT | |
---|---|---|---|---|---|---|
ICC | Supply current | VCC = 5 V to 40 V, CT = 1 nF, VPIN7 = VCC, VPIN5 > Vth, VPIN2 = GND, All other pins open |
Full range | 4 | mA |