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onsemi MC34167TVG
- Part No.:
- MC34167TVG
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
MC34167TVG.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,472
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Product details
Overview
MC34167TVG from onsemi is a fixed-frequency voltage-mode switching regulator IC designed for step-down, inverting, and step-up/down dc-dc converter topologies. It integrates a 5.0 A output switch, 72 kHz oscillator with on-chip timing, precision 5.05 V ±2% reference, cycle-by-cycle current limiting, and thermal shutdown. It operates from 7.5 V to 40 V input and delivers regulated outputs in automotive power supplies and industrial converters.
For engineers reviewing the MC34167TVG datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts, and supply-chain support details specific to the TO-220 (Case 314B) Pb-free variant.
Technical Context
The MC34167TVG implements voltage-mode PWM control using an internal error amplifier with 80 dB open-loop gain and 600 kHz unity-gain bandwidth, referenced to a trimmed 5.05 V bandgap. Its oscillator generates a 72 kHz ramp with 95% max duty cycle and built-in blanking to prevent multiple pulses per cycle.
Protection architecture includes undervoltage lockout with 5.9 V startup threshold and 0.9 V hysteresis, cycle-by-cycle current limiting triggered at 6.5 A typical, and thermal shutdown activating near 170 °C. Standby mode reduces supply current to 36 µA when compensation pin voltage drops below 150 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current | 5.0 A continuous - supports high-current step-down converters up to 5 A load without external MOSFET. |
| Oscillator Frequency | 72 kHz fixed - enables predictable EMI filtering and stable loop compensation with minimal external components. |
| Reference Voltage | 5.05 V ±2% - sets base output voltage; allows precise 5.0 V regulation after cable drop compensation. |
| Input Voltage Range | 7.5 V to 40 V - compatible with 12 V/24 V automotive and industrial bus systems. |
| Duty Cycle Range | 0% to 95% - supports wide output voltage adjustment in buck and inverting configurations. |
| UVLO Threshold | 5.9 V startup with 0.9 V hysteresis - prevents erratic operation during brown-out conditions. |
| Thermal Shutdown | ~170 °C - protects die during overload or inadequate heatsinking; requires external heatsink for >1.5 W dissipation. |
Pinout & Package
The MC34167TVG is housed in a 5-lead TO-220 package (Case 314B), with the metal tab electrically connected to Pin 3 (Ground) and intended for heatsink mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Compensation) | Error amplifier output / compensation node | Connects to RC network (RF, CF) for loop stability; clamping below 150 mV enables 36 µA standby mode. |
| Pin 2 (Switch Output) | Collector of internal NPN power transistor | Drives external inductor; must be isolated from ground in inverting config; rated for −2.0 V to +Vin. |
| Pin 3 (Ground) | Power and signal reference | Common return for all internal circuits; tab is internally tied to this pin for thermal conduction. |
| Pin 4 (VCC) | Primary power supply input | Accepts 7.5–40 V; powers internal circuitry and bias networks; UVLO monitors this pin. |
| Pin 5 (Feedback) | Inverting input of error amplifier | Connected to resistor divider from output; compares against internal 5.05 V reference to regulate VO. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A switch | Eliminates need for external power transistor in ≤5 A buck/inverting designs, reducing BOM count and layout area. |
| Fixed 72 kHz oscillator | Removes external timing components; ensures consistent switching frequency across temperature and supply variations. |
| 0–95% duty cycle control | Enables full-range output voltage adjustment from near-zero to Vin in buck topology, and negative outputs in inverting mode. |
| Cycle-by-cycle current limit | Provides instantaneous overcurrent protection per switching cycle, preventing MOSFET or inductor saturation damage. |
| Standby mode (36 µA) | Reduces system quiescent current significantly during idle states-critical for battery-backed or low-power standby applications. |
Applications
| Automotive Power Supply | Industrial DC-DC Converter |
|---|---|
Use Scenario: Regulating 12 V battery input to stable 5.0 V for engine control unit (ECU) logic rails under cold-crank (6.5 V) and load-dump (36 V) transients. IC Role / Device Role / Timing Role: Primary voltage-mode PWM controller implementing step-down conversion with integrated switch and UVLO hysteresis. Use Value: Delivers 5.0 V ±0.039% line regulation across 10–36 V input while surviving automotive transients via 40 V absolute max rating and thermal shutdown. | Use Scenario: Generating isolated −12 V @ 1.7 A from 12 V input for analog sensor front-ends in factory automation PLC modules. IC Role / Device Role / Timing Role: Inverting regulator controller with grounded feedback reference, enabling negative output without external op-amp. Use Value: Achieves −12 V output with 0.020% load regulation and 78 mVpp ripple using single inductor and Schottky rectifier-reducing component count vs. charge-pump solutions. |
| Triple-Output Distributed Power | Motor Speed Control |
Use Scenario: Providing three independent outputs (5.0 V/3.0 A, 12 V/250 mA, −12 V/200 mA) from 24 V bus in telecom shelf power systems. IC Role / Device Role / Timing Role: Core controller in multi-winding transformer-based triple-output flyback, regulating primary-side via feedback winding. Use Value: Enables 84.2% total efficiency and <±0.03% 5 V line regulation while supporting auxiliary outputs ≤33% of total power-minimizing cross-regulation issues. | Use Scenario: Controlling brushed DC motor speed in HVAC actuators using back-EMF sensing for closed-loop RPM regulation. IC Role / Device Role / Timing Role: PWM generator modulating drive transistor duty cycle based on EMF-derived tach signal fed into feedback pin. Use Value: Maintains ±1% speed stability across 12–24 V supply range without position encoder-leveraging internal error amp's high PSRR (80 dB) against supply noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34167D2TG | D2PAK surface-mount package; identical electrical specs and temperature range (0°C to +70°C). | Requires reflow-compatible PCB layout; better thermal performance with copper pour but no through-hole heatsink option. | Select for automated SMT assembly or space-constrained layouts where TO-220 footprint is prohibitive. |
| MC33167TVG | Same pinout and function; extended temp range (−40°C to +85°C); otherwise identical electrical behavior. | Suitable for under-hood automotive or outdoor industrial environments where ambient exceeds +70°C. | Choose when operating temperature exceeds +70°C; note MC33167TVG is discontinued per onsemi documentation. |
Compared with MC34167D2TG, the MC34167TVG offers through-hole mechanical robustness and direct heatsink mounting, while MC33167TVG adds extended temperature capability at the cost of product lifecycle availability-making MC34167TVG optimal for cost-sensitive, commercial-temp industrial power designs requiring long-term supply stability.
Availability
MC34167TVG is available at Aetrix Electronics and suitable for automotive power supplies, industrial DC-DC converters, distributed power systems, and motor control applications requiring stable component supply and legacy-compatible TO-220 packaging.
Supply support for MC34167TVG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC34167TVG belongs to onsemi's legacy monolithic switching regulator product line, engineered for cost-effective, high-reliability dc-dc conversion in non-automotive industrial and consumer power systems with emphasis on simplicity and thermal robustness.
FAQ
What is the maximum input voltage rating for the MC34167TVG?
The MC34167TVG has an absolute maximum power supply input voltage (VCC) rating of 40 V. This allows safe operation across 12 V and 24 V automotive and industrial bus systems, including transient conditions like load dump. Exceeding 40 V risks permanent damage; designs must include clamping or pre-regulation if input may exceed this limit. The MC34167TVG datasheet confirms this rating in the Maximum Ratings table on page 2.
Does the MC34167TVG support negative output voltage generation?
Yes, the MC34167TVG supports voltage-inverting configurations to generate negative outputs such as −12 V. This is achieved by grounding the IC's GND pin (Pin 3) to the negative output rail, which reverses the error amplifier's effective inputs and keeps the switch emitter within its −1.5 V limit. Figure 23 in the MC34167TVG datasheet validates this topology with measured 1.7 A output and 79.5% efficiency at 12 V input.
What is the purpose of the Compensation pin (Pin 1) on the MC34167TVG?
The Compensation pin (Pin 1) on the MC34167TVG serves as the output of the internal error amplifier and the node for external loop compensation. Connecting an RF–CF network here stabilizes the control loop; clamping Pin 1 below 150 mV activates low-power standby mode, reducing ICC to 36 µA. This dual-role pin is critical for both dynamic performance and power management in the MC34167TVG.
Can the MC34167TVG be used in step-up (boost) converter designs?
Yes, the MC34167TVG can be used in step-up applications, though it requires an external power MOSFET (e.g., MTP3055EL) as shown in Figure 21 of the datasheet. The internal switch handles only the low-side drive, while the external FET manages high-side switching. This hybrid configuration achieves 80.1% efficiency at 12 V input / 28 V output and provides inherent short-circuit protection via the MC34167TVG's current limiting.
What thermal management is required for the MC34167TVG in continuous 5 A operation?
At 5 A output in step-down mode, the MC34167TVG dissipates significant power-requiring a heatsink. With θJC = 5.0 °C/W and θJA = 65 °C/W (TO-220), junction temperature rises rapidly without heatsinking. onsemi recommends AAVID 5903B or 5930B heatsinks; thermal calculations show >10 W dissipation exceeds safe limits without attachment. The metal tab (Pin 3) must be electrically and thermally connected to the heatsink per Case 314B mechanical drawings.
MC34167TVG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5.05V
- Voltage - Output (Max):
- 40V (Switch)
- Current - Output:
- 5.5A (Switch)
- Frequency - Switching:
- 72kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
MC34167TVG FAQ
1.How can I place an order for MC34167TVG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34167TVG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC34167TVG reliable?
The price and inventory of MC34167TVG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34167TVG is usually 5 days.
3.What payment methods are accepted for MC34167TVG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34167TVG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34167TVG?
MC34167TVG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34167TVG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC34167TVG?
For technical support, including MC34167TVG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34167TVG requirements.
6.How does Aetrix verify that MC34167TVG is sourced from the original manufacturer or authorized distributors?
All MC34167TVG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC34167TVG meets industry standards.
7.What is the process for return or replacement of MC34167TVG?
All MC34167TVG units undergo pre-shipment inspection (PSI). If there is an issue with MC34167TVG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC34167TVG part is unused and in its original packaging.
Return procedure for MC34167TVG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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