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The following provides detailed information regarding the MC34063AP1 chip:
Technical Specifications
- Operating Voltage Range: 3.0 V – 40 V
- Output Switch Current: 1.5 A (Peak)
- Output Voltage: Adjustable (via external resistor divider)
- Operating Frequency: Up to 100 kHz (set by external timing capacitor)
- Reference Voltage: 1.25 V ± 2% (Temperature Compensated)
- Quiescent Current (Standby): Low standby current design
- Current Limit: Built-in cycle-by-cycle current limiting function
- Duty Cycle: Up to 100% (constrained by current limit)
- Operating Temperature Range:
- MC34063A: 0°C to +70°C (Commercial Grade)
- MC33063A: -40°C to +85°C (Industrial Grade)
- MC33063AV: -40°C to +125°C (Extended Industrial Grade)
- Package Thermal Resistance:
- PDIP-8 (P1 Suffix): θJA ≈ 100°C/W, θJC ≈ 40°C/W
- SOIC-8 (D Suffix): θJA ≈ 150°C/W, θJC ≈ 60°C/W
Internal Functional Block Diagram
```
┌─────────────────────────────────────┐
│ 1.25V Temperature-Compensated Reference │
│ ↓ │
│ ┌─────────┐ ┌─────────┐ │
│ 5 ─┤ Comparator├←───┤ Error Amp │←── Feedback
│ └────┬────┘ └─────────┘ │
│ ↓ │
│ ┌─────────┐ ┌─────────┐ │
│ │ RS Flip-Flop│←───┤ Oscillator │←── 3 Timing Capacitor
│ └────┬────┘ └─────────┘ │
│ ↓ │
│ ┌─────────┐ ┌─────────┐ │
│ 8 ─┤ Driver ```
├──→─┤ Darlington │→── 1 Switch Collector
│ │ │ │ Switching Transistor │ │
│ └─────────┘ └────┬────┘ │
│ 7 ←────────────────────┤ Current Sense │←── 6 VCC
│ 100Ω └────┘ │
│ ┌─────────┐ │
│ 2 ←┤ Switch Emitter │ │
│ └─────────┘ │
│ ↓ │
│ ┌─────────┐ │
│ 4 ─┤ GND │ │
│ └─────────┘ │
└─────────────────────────────────────┘
```
Pin Definitions (PDIP-8 / SOIC-8)
Pin | Name | Function
1 | Switch Collector | Collector of the internal Darlington switching transistor
2 | Switch Emitter | Emitter of the internal Darlington switching transistor
3 | Timing Capacitor | Connection point for the oscillator timing capacitor
4 | GND | Ground
5 | Comparator Inverting Input | Inverting input of the comparator (Feedback voltage divider point)
6 | VCC | Power supply input
7 | Ipk Sense | Peak current sense input
8 | Driver Collector | Collector of the driver stage (typically connected to VCC)
Typical Application Circuit
1. Step-Down Converter (Buck)
```
VIN (8-40V)
│
├──┬──┐
│ │ │
│ C1 │ 100µF
│ │ │
│ └──┤
│ │
├─────┤
│ │
├─1───┤8──┐
│ IC │ │
├─2───┤ R1
│ │ │
L1 │ ├──→ VOUT (5V)
330µH │ │
│ │ R2
├──┬──┤ │
│ C2 │ │
│ │ │ │
│ └──┘ │
│ 5────┘
│ │
└─────┘
│
GND
```
- Key Components: L1 = 330 µH, C1 = 100 µF, C2 = 470 µF; R1/R2 set the output voltage
- Formula: VOUT = 1.25 V × (1 + R2/R1)
2. Step-Up Converter (Boost)
```
VIN (3-40V)
│
├──┬──┐
│ │ │
│ C1 │ 100µF
│ │ │
│ └──┤
│ │
├─6───┤8──┐
│ IC │ │
├─1───┤ D1
│ │ ├─→ VOUT (12V)
├─2───┤ │
│ │ C2
L1 │ │
170µH │ │
│ │ │
└─────┤ │
│ │
5────┘
│
GND
```
3. Inverting Converter
```
VIN (+5V)
│
├──┬──┐
│ C1 │ 100µF
│ │ │
│ └──┤
│ │
├─6───┤8──┐
│ IC │ │
├─1───┤ D1
│ │ ├─→ 0V
├─2───┤ │
│ │ C2
L1 │ │
170µH │ │
│ │ │
└──┬──┤ │
│ │ │
└──┴────┴─→ -12V
│
5
│
GND
```
Key Design Formulas
Parameter Formula
Output Voltage VOUT = 1.25 V × (1 + R2/R1)
Oscillation Frequency fOSC ≈ 1.8 / (CT × RT); typical CT = 470 pF – 10 nF
Timing Resistor RT = (VIN - VBE) / 0.2; typical 2 kΩ
Peak Current Ipk = 0.3 V / RSENSE (RSENSE connected between pins 6 and 7)
Inductance Value (Buck) LMIN = (VIN - VOUT) × TON / (2 × Ipk)
Output Ripple ΔVOUT ≈ Ipk × TON / COUT
Alternative Models and Competitors
Model Manufacturer Key Differences
MC33063AP1 ON Semi / TI -40°C to +85°C Industrial Grade Version
MC33063AVP ON Semi / TI -40°C to +125°C Extended Temperature Version
MC34063AD ON Semi / TI SOIC-8 Package Version
AP34063 Diodes Inc. Pin-compatible, Cost-optimized
KA34063 Samsung / Fairchild Pin-compatible, Korean-manufactured Version
LM2575 TI 3A Fixed Output, Higher Efficiency
MP1584 MPS 3A Synchronous Buck, Higher Frequency
XL6009 XLSEMI 4A Boost, Higher Power
**Important Notes**
- **Compatibility:** The MC34063AP1 utilizes bipolar technology; consequently, its switching frequency is limited (typically <<100 kHz), and its efficiency ranges from approximately 70% to 85%. For applications requiring higher efficiency, it is recommended to opt for synchronous rectification solutions, such as the MP1584 or TPS5430.
- **Installation Guidelines:**
- For the PDIP-8 package, observe a pin pitch of 2.54 mm; soldering temperature must not exceed 260°C, with a maximum duration of 10 seconds.
- For the timing capacitor (CT), it is recommended to use NPO/C0G or X7R dielectric materials due to their superior temperature stability.
- The output capacitor should be a low-ESR electrolytic or solid-state capacitor; its capacitance value should be calculated based on the specific load current and ripple requirements.
- The current-sensing resistor (RSENSE) should be a low-resistance, high-precision (1%) resistor; ensure sufficient power headroom is allocated by calculating the power dissipation using the I²R formula.
- **Technical Support:** For further technical assistance, please refer to ON Semiconductor's application notes AN920A/D and AN954/D, or contact an authorized distributor.
**Summary**
The MC34063AP1 is a classic monolithic DC-DC converter control IC manufactured by ON Semiconductor. Housed in a PDIP-8 package, it integrates a temperature-compensated reference, comparator, oscillator, driver, and a 1.5A Darlington switch. It requires only a minimal number of external components to implement step-down (buck), step-up (boost), and inverting DC-DC conversions. With its wide input voltage range (3V–40V), adjustable output, and comprehensive protection features, the MC34063AP1 offers exceptional practicality and reliability in power supply designs for automotive electronics, industrial control systems, and consumer electronics. It remains one of the most widely adopted, low-cost DC-DC solutions in the industry today.
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