MC34063
Every spec below is cited to the manufacturer datasheet. Pick your exact ordering code, compare the closest alternatives, then ask the assistant what it means for your design.
What the MC34063 family does
The MC34063A/E series is a monolithic DC-DC converter control circuit available in DIP-8 and SO-8 packages. It features a 1.5A output switch, 2% reference accuracy, and low quiescent current of 2.5mA typical. The device operates from 3V to 40V with frequency capability up to 100kHz. Engineers typically use it for step-down, step-up, and voltage-inverting applications. The internal architecture includes a temperature-compensated reference, comparator, duty cycle controlled oscillator, and active current limiting. Output voltage adjusts via two external resistors while employing a minimum number of external components for efficient power conversion.
MC34063A datasheet parameters
| Parameter | Min | Typ | Max | Conditions | Source |
|---|---|---|---|---|---|
| quiescent current | — | 2.5 mA | 44 mA | VCC = 5 to 40 V CT = 1 nFPin 7 = VCCVpin5> VthPin 2 = GNDRemaining pins openforMC34063AforMC34063E | ST datasheet, p. 3 — TOTAL DEVICE |
| output current (abs max) | — | — | 1.5 A | Switch Current, max rating | onsemi datasheet, p. 2 — MAXIMUM RATINGS |
| supply voltage range | 3 V | — | 40 V | onsemi datasheet, p. 1 | |
| switching frequency | — | 33 kHz | — | CT = 1.0 nF, Pin 5 = 0 V, TA = 25 C, typical | onsemi datasheet, p. 3 — MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A |
| operating temperature (abs max) | 0 °C | — | 125 °C | top(foreb series); ABSOLUTE MAXIMUM RATINGS | ST datasheet, p. 2 — ABSOLUTE MAXIMUM RATINGS |
| power dissipation (abs max) | — | — | 1.25 W | ta; Plastic Package, P, P1 Suffix | onsemi datasheet, p. 2 — MAXIMUM RATINGS |
| standby current | — | 1.38 mA | — | VCC = 40 V, CT = 1.0 nF, Pin 7 = VCC, Pin 2 = GND | onsemi datasheet, p. 4 |
| dropout voltage | — | 450 mV | — | VCE(sat), ISW = 1 A, Rpin8 = 82 Ω to VCC, forced β~20, typical | ST datasheet, p. 3 — OUTPUT SWITCH |
| output noise voltage | — | 300 mV | — | Output Ripple, VIN = 12 V, IO = 175 mA, typical application circuit | ST datasheet, p. 6 — TYPICAL APPLICATION CIRCUIT |
| output count | — | 1 | — | onsemi datasheet, p. 1 |
MC34063A frequently asked questions
What is the dropout voltage (VCE(sat)) when ISW = 1 A, Rpin8 = 82 Ω to VCC, and forced β~20?
The dropout voltage is 450 mV.
What is the maximum operating temperature for the MC34063A under absolute maximum ratings for the foreb series?
The operating temperature is 125 °C for the foreb series under absolute maximum ratings.
What is the output count for the MC34063A?
The output count is 1.
What is the maximum rating for the Switch Current?
The maximum rating for the Switch Current is 1.5 A.
What is the output noise voltage under the condition of Output Ripple, VIN = 12 V, IO = 175 mA, typical application circuit?
The output noise voltage is 300 mV.
What is the power dissipation for the MC34063A with a Plastic Package, P, P1 Suffix at ta?
The power dissipation is 1.25 W.
What is the quiescent current of the MC34063A when VCC = 5 to 40 V, CT = 1 nF, Pin 7 = VCC, Pin 5 > Vth, Pin 2 = GND, and remaining pins are open?
The quiescent current is 2.5 mA.
What is the standby current of the MC34063A when VCC = 40 V, CT = 1.0 nF, Pin 7 = VCC, and Pin 2 = GND?
The standby current is 1.38 mA.
What is the supply voltage range for the MC34063A?
The supply voltage range is 40 V.
What is the typical switching frequency when CT = 1.0 nF, Pin 5 = 0 V, and TA = 25 C?
The typical switching frequency is 33 kHz.
MC34063E datasheet parameters
| Parameter | Min | Typ | Max | Conditions | Source |
|---|---|---|---|---|---|
| quiescent current | — | 1.5 mA | 44 mA | VCC = 5 to 40 V CT = 1 nFPin 7 = VCCVpin5> VthPin 2 = GNDRemaining pins openforMC34063AforMC34063E | ST datasheet, p. 3 — TOTAL DEVICE |
| output current (abs max) | — | — | 1.5 A | Switch current, absolute maximum rating | ST datasheet, p. 2 — ABSOLUTE MAXIMUM RATINGS |
| supply voltage range | 3 V | — | 40 V | VCC test range, threshold voltage line regulation | ST datasheet, p. 3 — COMPARATOR |
| switching frequency | — | 33 kHz | — | CT = 1 nF, Vpin5 = 0 V, Ta = 25 °C, typical | ST datasheet, p. 3 — OSCILLATOR |
| operating temperature (abs max) | 0 °C | — | 125 °C | top(foreb series); ABSOLUTE MAXIMUM RATINGS | ST datasheet, p. 2 — ABSOLUTE MAXIMUM RATINGS |
| standby current | — | 1.5 mA | — | VCC = 5 to 40 V, CT = 1 nF, Pin7 = VCC, Vpin5>Vth, Pin2 = GND, typical | ST datasheet, p. 3 — TOTAL DEVICE |
| dropout voltage | — | 450 mV | — | VCE(sat), ISW = 1 A, Rpin8 = 82 Ω to VCC, forced β~20, typical | ST datasheet, p. 3 — OUTPUT SWITCH |
| output noise voltage | — | 300 mV | — | Output Ripple, VIN = 12 V, IO = 175 mA, typical application circuit | ST datasheet, p. 6 — TYPICAL APPLICATION CIRCUIT |
| output count | — | 1 | — | single-output DC-DC converter | ST datasheet, p. 1 |
MC34063E frequently asked questions
What is the typical dropout voltage (VCE(sat)) when ISW = 1 A, Rpin8 = 82 Ω to VCC, and forced β~20?
The typical dropout voltage is 450 mV.
What is the maximum operating temperature for the foreb series of the MC34063E under absolute maximum ratings?
The operating temperature is 125 °C for the foreb series under absolute maximum ratings.
What is the output count for the MC34063E?
The output count is 1 for a single-output DC-DC converter.
What is the absolute maximum rating for the switch current of the MC34063E?
The output current is 1.5 A.
What is the output noise voltage under the condition of Output Ripple, VIN = 12 V, IO = 175 mA, typical application circuit?
The output noise voltage is 300 mV.
What is the quiescent current of the MC34063E when VCC = 5 to 40 V, CT = 1 nF, Pin 7 = VCC, Pin 5 > Vth, Pin 2 = GND, and remaining pins are open?
The quiescent current is 1.5 mA.
What is the standby current of the MC34063E when VCC = 5 to 40 V, CT = 1 nF, Pin7 = VCC, Vpin5>Vth, and Pin2 = GND?
The standby current is 1.5 mA.
What is the supply voltage range for the MC34063E under VCC test range, threshold voltage line regulation conditions?
The supply voltage range is 40 V.
What is the switching frequency when CT = 1 nF, Vpin5 = 0 V, Ta = 25 °C, typical?
The switching frequency is 33 kHz.