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onsemi MC34167TV
- Part No.:
- MC34167TV
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
MC34167TV.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
MC34167TV from onsemi is a fixed-frequency, voltage-mode switching regulator IC designed for step-down, voltage-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, latching PWM, error amplifier, and thermal/UVLO protection. It operates from 7.5 V to 40 V input and delivers stable regulation in automotive power supplies and industrial DC rails.
For engineers reviewing the MC34167TV datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application configurations (step-down, inverting), and two rigorously cross-checked alternative parts with documented functional and packaging differences.
Technical Context
The MC34167TV implements voltage-mode control using an internal 5.05 V reference and high-gain error amplifier (80 dB typical gain, 600 kHz unity-gain bandwidth) with externally accessible inverting input and output pins. Its fixed 72 kHz oscillator drives a latching PWM comparator that enforces single-pulse metering per cycle, preventing multiple switch activations.
Cycle-by-cycle current limiting monitors switch conduction via an internal trimmed sense resistor and comparator, triggering latch reset at 6.5 A typical peak current. Undervoltage lockout (5.9 V startup threshold with 0.9 V hysteresis) and thermal shutdown (activation ~170 °C) provide robust fault protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Rating | 5.0 A continuous output capability enables direct drive of medium-power buck or inverting converters without external MOSFETs. |
| Oscillator Frequency | 72 kHz fixed frequency simplifies EMI filtering and allows predictable timing for loop compensation and inductor sizing. |
| Reference Voltage | 5.05 V ±2% internal reference sets base output voltage; eliminates need for external divider in 5 V designs. |
| Input Voltage Range | 7.5 V to 40 V operation supports 12 V/24 V automotive and industrial bus inputs with margin for transients. |
| Duty Cycle Range | 0% to 95% max duty cycle permits wide output voltage adjustment in step-down and inverting topologies. |
| Standby Supply Current | 36 µA standby mode reduces system quiescent power when output regulation is not required. |
| Thermal Shutdown | Internal thermal shutdown activates at ~170 °C to prevent catastrophic failure during overload or poor heatsinking. |
Pinout & Package
The MC34167TV is housed in a 5-lead TO-220 package (Case 314B), with the metal tab electrically connected to Pin 3 (GND) 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; also used for soft-start via external capacitor charging. |
| Pin 2 (Switch Output) | Collector of internal NPN power switch | Drives external inductor; must be connected to Schottky rectifier cathode in step-down/inverting configs. |
| Pin 3 (Ground) | Power and signal ground reference | Common return for internal circuits; tab is internally bonded to this pin for thermal path. |
| Pin 4 (VCC) | Primary power supply input | Accepts 7.5–40 V; powers internal circuitry and enables UVLO functionality. |
| Pin 5 (Feedback) | Inverting input of error amplifier | Connected to output divider; compares regulated output against internal 5.05 V reference. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A switch | Eliminates need for external power transistor in ≤5 A step-down or inverting converters, reducing BOM count and layout complexity. |
| Fixed 72 kHz oscillator | Enables consistent EMI profile and predictable inductor selection; avoids frequency drift over temperature or supply. |
| 5.05 V ±2% reference | Provides accurate base regulation point; 50 mV headroom compensates for typical 1% cable drop in 5 V systems. |
| Cycle-by-cycle current limit | Protects switch under short-circuit or overload by terminating each conduction cycle individually-no latch-up risk. |
| Undervoltage lockout with hysteresis | Prevents erratic startup/shutdown near threshold; 0.9 V hysteresis ensures clean enable/disable behavior during brownout recovery. |
Applications
| Automotive Power Supply | Industrial DC Rail Converter |
|---|---|
Use Scenario: Regulating 12 V battery input to stable 5 V for engine control unit (ECU) sensors and microcontrollers. IC Role / Device Role / Timing Role: Primary voltage-mode controller implementing step-down topology with integrated 5 A switch and internal 5.05 V reference. Use Value: Reduces component count vs. controller+external MOSFET solutions; withstands load dump transients up to 40 V input. | Use Scenario: Generating isolated -12 V rail from 24 V factory automation bus for analog signal conditioning. IC Role / Device Role / Timing Role: Core inverting regulator IC driving external inductor and Schottky diode; uses ground-referenced feedback inversion technique. Use Value: Enables compact negative output generation without dual-output controllers; achieves 79.5% efficiency at 1.7 A load. |
| Triple-Output Distributed PSU | Brush Motor Speed Control |
Use Scenario: Providing +5 V/3 A, +12 V/250 mA, and -12 V/200 mA from single 24 V input in test equipment. IC Role / Device Role / Timing Role: Master step-down controller with auxiliary windings on main inductor to derive secondary outputs via transformer action. Use Value: Achieves 84.2% total efficiency and <±0.03% line regulation on primary rail while maintaining <±2.9% regulation on auxiliaries. | Use Scenario: Controlling speed of 18 V brushed DC motor using back-EMF feedback in portable tools. IC Role / Device Role / Timing Role: PWM generator modulating motor drive based on sensed EMF; uses internal oscillator and error amp for closed-loop RPM regulation. Use Value: Delivers ±1% low-speed line regulation across 12–24 V input range, enabling precise torque/speed response without encoder. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33167TVG | Same pinout and architecture but rated for −40 °C to +85 °C operating range vs. MC34167TV's 0 °C to +70 °C. | Required for extended-temperature automotive or outdoor industrial use; otherwise functionally identical in circuit design. | Select MC33167TVG when ambient temperature exceeds +70 °C or drops below 0 °C. |
| LM2596T-5.0 | Fixed 5.0 V output (non-adjustable), 3 A switch current, 150 kHz switching frequency, different pinout and compensation scheme. | Suitable only for simple 5 V step-down; lacks inverting/step-up capability and cycle-by-cycle current limiting of MC34167TV. | Choose LM2596T-5.0 only for cost-sensitive, low-current, fixed-output applications where flexibility is not required. |
Compared with MC34167TV, MC33167TVG offers wider temperature tolerance without changing layout or compensation, while LM2596T-5.0 trades topology flexibility and current capability for lower cost and simpler implementation in basic 5 V buck designs.
Availability
MC34167TV is available at Aetrix Electronics and suitable for automotive power supplies, industrial DC rail converters, triple-output distributed PSUs, and brush motor speed control requiring stable component supply and long-term manufacturability support.
Supply support for MC34167TV 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC34167TV belongs to onsemi's legacy monolithic switching regulator product line, engineered for cost-effective, high-reliability DC-DC conversion in thermally constrained environments using minimal external components.
FAQ
What is the maximum input voltage rating for the MC34167TV?
The MC34167TV has an absolute maximum power supply input voltage (VCC) of 40 V, with recommended operating range from 7.5 V to 40 V. Exceeding 40 V risks permanent damage. This rating enables compatibility with 24 V industrial buses and 12 V automotive systems including load-dump transients. The MC34167TV internal UVLO prevents operation below 5.9 V, ensuring reliable startup.
Can the MC34167TV be used in voltage-inverting configurations?
Yes, the MC34167TV is explicitly designed for voltage-inverting applications, as confirmed in its datasheet title and Figure 23. It achieves this by re-referencing the IC ground pin to the negative output, reversing error amplifier polarity while retaining internal 5.05 V reference. The MC34167TV delivers −12 V/1.7 A with 79.5% efficiency and ±0.61% line regulation in validated inverting designs.
Does the MC34167TV require external compensation components?
Yes, the MC34167TV requires external loop compensation: a resistor (RF) from output to Pin 5 (FB), and an RC network (RF, CF) between Pins 1 (Comp) and 5 (FB). These components stabilize the voltage-mode control loop; values differ by topology-step-down is easiest, while inverting and step-up/down demand careful tuning per Figure 14 and design equations in Table 1 of the MC34167TV datasheet.
What is the purpose of the standby mode in the MC34167TV?
The MC34167TV enters low-power standby mode when Pin 1 (Compensation) voltage is clamped below 150 mV, reducing supply current to 36 µA at 12 V VCC. This feature enables energy-saving sleep states in battery-powered or always-on systems. Standby is implemented via internal circuitry-not software-and resumes normal regulation immediately upon release of Pin 1.
Is the MC34167TV pin-compatible with the MC33167 series?
Yes, the MC34167TV is pin-compatible with MC33167TVG and other members of the MC33167/MC34167 family in the same TO-220 package. Both share identical pinout (Pin 1 = Comp, Pin 2 = Switch, Pin 3 = GND, Pin 4 = VCC, Pin 5 = FB), electrical characteristics, and functional block diagram. The only difference is operating temperature range: MC34167TV is rated 0 °C to +70 °C, while MC33167TVG extends to −40 °C to +85 °C.
MC34167TV 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
MC34167TV FAQ
1.How can I place an order for MC34167TV through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34167TV 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 MC34167TV reliable?
The price and inventory of MC34167TV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34167TV is usually 5 days.
3.What payment methods are accepted for MC34167TV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34167TV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34167TV?
MC34167TV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34167TV 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 MC34167TV?
For technical support, including MC34167TV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34167TV requirements.
6.How does Aetrix verify that MC34167TV is sourced from the original manufacturer or authorized distributors?
All MC34167TV 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 MC34167TV meets industry standards.
7.What is the process for return or replacement of MC34167TV?
All MC34167TV units undergo pre-shipment inspection (PSI). If there is an issue with MC34167TV, 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 MC34167TV part is unused and in its original packaging.
Return procedure for MC34167TV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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