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onsemi MC34167TG
- Part No.:
- MC34167TG
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
MC34167TG.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,338
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Product details
Overview
MC34167TG 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, latching PWM controller, and thermal/UVLO/current-limit protection. It operates from 7.5 V to 40 V input and supports high-efficiency power conversion in automotive and industrial power supplies.
For engineers reviewing the MC34167TG datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, exact pin functions, real-world converter configurations (step-down/inverting/step-up-down), thermal and current-limiting behavior, and validated alternative options - all grounded in the official ON Semiconductor Rev. 10 datasheet.
Technical Context
The MC34167TG implements voltage-mode 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 (4.1 V peak / 2.3 V valley) driving a latching PWM comparator that enforces single-pulse-per-cycle operation and enables 0–95% duty cycle control.
Cycle-by-cycle current limiting monitors switch conduction via an internal sense resistor, triggering immediate latch reset at 6.5 A typical threshold. Undervoltage lockout activates at 5.9 V (±0.3 V hysteresis), and thermal shutdown engages at ~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 |
|---|---|
| Output Switch Current | 5.0 A continuous (6.5 A typical current limit threshold); supports high-current buck/inverting converters without external MOSFETs in many designs. |
| Oscillator Frequency | 72 kHz nominal (62–79 kHz over temperature); fixed frequency simplifies EMI filtering and enables predictable loop compensation. |
| Reference Voltage | 5.05 V ±2% at +25 °C; internally trimmed and temperature-compensated for stable feedback in 5 V output designs. |
| Input Voltage Range | 7.5 V to 40 V; suitable for 12 V/24 V automotive and industrial bus systems with transient tolerance. |
| Duty Cycle Range | 0% to 95%; enables wide output voltage adjustment in step-down (VOUT < VIN) and inverting (VOUT = –VIN × D/(1−D)) topologies. |
| Standby Supply Current | 36 µA at 12 V; achieved by clamping compensation pin below 150 mV, enabling low-power sleep states in battery-backed systems. |
| Thermal Shutdown Threshold | ~170 °C junction temperature; protects against catastrophic failure during overload or inadequate heatsinking. |
Pinout & Package
MC34167TG is housed in a Pb-free 5-lead TO-220 package (Case 314B), with the metal tab electrically connected to Pin 3 (GND). The heatsink surface serves as terminal 6 in mechanical drawings but is internally tied to Pin 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Compensation (Comp) | Error amplifier output / loop compensation node | Connects to RC network (RF, CF) for stability tuning; pulling below 150 mV enables 36 µA standby mode. |
| Pin 2: Switch Output (SW) | Collector of internal NPN power transistor | Drives external inductor; rated for 40 V max VCE and 5.5 A min peak current; requires Schottky rectifier (e.g., 1N5825). |
| Pin 3: Ground (GND) | Power and signal reference ground | Common return for internal circuits; tab is electrically connected to this pin - must be thermally and electrically grounded. |
| Pin 4: Input Supply (VCC) | Main power supply input | Accepts 7.5–40 V; powers internal circuitry and bias networks; UVLO monitors this pin. |
| Pin 5: Feedback (FB) | Inverting input of error amplifier | Internally biased to 5.05 V reference; connects to resistor divider from output to set regulated voltage (e.g., 5.0 V, ±0.039% line regulation). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A NPN switch | Eliminates need for external high-current transistor in many 5 V/3 A–5 A step-down or inverting supplies. |
| Fixed 72 kHz oscillator with on-chip timing | Removes external timing capacitor/resistor; ensures consistent switching frequency across units and temperature. |
| 0–95% programmable duty cycle | Enables full-range output voltage control in buck (VOUT = VIN × D) and inverting (VOUT = –VIN × D/(1−D)) topologies. |
| Cycle-by-cycle current limiting | Protects switch under short-circuit or overload by terminating each conduction cycle at 6.5 A typical threshold. |
| Undervoltage lockout with 0.9 V hysteresis | Prevents erratic startup or oscillation near minimum input; ensures clean enable/disable at 5.9 V rising / 5.0 V falling thresholds. |
| 150 mV-triggered standby mode | Reduces quiescent current to 36 µA - critical for low-power hold-up or battery backup applications. |
Applications
| Automotive Body Control Module (BCM) Power | Industrial 5 V Microcontroller Supply |
|---|---|
|
Use Scenario: Generating stable 5.0 V @ 3–5 A from a 12 V vehicle battery with load dump transients up to 40 V. IC Role / Device Role / Timing Role: Primary switching regulator in step-down topology; provides regulated rail for MCU, CAN transceivers, and sensors. Use Value: Achieves ±0.039% line regulation and 78.9% efficiency at 5 A, with built-in UVLO and thermal shutdown meeting automotive reliability requirements. |
Use Scenario: Powering ARM Cortex-M7-based PLC I/O modules requiring precise 5 V at up to 5 A in factory automation cabinets. IC Role / Device Role / Timing Role: Core DC-DC controller in isolated or non-isolated buck converter; interfaces with external Schottky diode and 190 µH inductor. Use Value: Delivers 20 mVpp output ripple and ±0.01% load regulation - sufficient for noise-sensitive analog front-ends and ADC references. |
| Negative Rail Generator for Op-Amp Circuits | Triple-Output Distributed Power System |
|
Use Scenario: Creating –12 V @ 1.7 A from a 12 V input for dual-supply op-amps and instrumentation amplifiers in test equipment. IC Role / Device Role / Timing Role: Voltage-inverting converter controller; IC ground tied to negative output to reverse error amp polarity and maintain regulation. Use Value: Provides –12 V with ±0.020% load regulation and 79.5% efficiency; avoids need for separate negative charge pump or transformer-based solution. |
Use Scenario: Delivering +5 V/3 A, +12 V/250 mA, and –12 V/200 mA from a common 24 V bus in embedded telecom shelf power. IC Role / Device Role / Timing Role: Primary controller in triple-output flyback-derived design using multi-winding inductor; regulates main output while auxiliaries track via turns ratio. Use Value: Achieves 84.2% total efficiency and <3% cross-regulation error - enabling compact, cost-effective multi-rail power without multiple controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33167D2TG | Same architecture and pinout, but rated for –40 °C to +85 °C operating range vs. MC34167TG's 0 °C to +70 °C. | Required for extended-temperature industrial or automotive under-hood use; otherwise functionally identical in circuit design. | Select MC33167D2TG when ambient temperature exceeds +70 °C or falls below 0 °C; no layout change needed. |
| LM2596-5.0 | Fixed 5.0 V output (non-adjustable), 3 A switch current, 150 kHz switching, SO-8 package; lacks inverting/step-up-down capability. | Suitable only for basic step-down 5 V supplies; cannot implement negative or boost-derived outputs without redesign. | Choose LM2596-5.0 for cost-sensitive, single-rail 5 V applications where 3 A suffices and topology flexibility is not required. |
Compared with MC34167TG, MC33167D2TG extends temperature range without altering electrical behavior or footprint, while LM2596-5.0 trades topology versatility and current capability for lower cost and simpler implementation in fixed 5 V buck-only systems.
Availability
MC34167TG is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC power supplies, test equipment negative rail generation, and distributed multi-output power systems requiring stable component supply and long-term manufacturability.
Supply support for MC34167TG 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 MC34167TG belongs to onsemi's legacy monolithic switching regulator product line, engineered for robust, low-component-count DC-DC conversion in cost-sensitive and thermally demanding environments - particularly step-down, inverting, and hybrid step-up/down topologies.
FAQ
What is the maximum output current capability of the MC34167TG?
The MC34167TG integrates a high-current NPN switch rated for 5.0 A continuous output, with a typical current limit threshold of 6.5 A. Actual deliverable current depends on thermal management: with proper heatsinking (e.g., AAVID 5903B), it sustains 5 A in step-down configurations at 78.9% efficiency. Peak pulsed current reaches 8.0 A per datasheet limits.
Can the MC34167TG be used in a step-up (boost) configuration?
The MC34167TG is not a native boost controller, but it can be used in step-up/down configurations when paired with an external MOSFET (e.g., MTP3055EL), as shown in Figure 21 of the datasheet. In this arrangement, the MC34167TG drives the main switch while the external FET handles higher voltage/current demands - enabling programmable outputs above input voltage with built-in short-circuit protection.
What package type and thermal characteristics does the MC34167TG have?
The MC34167TG uses a Pb-free 5-lead TO-220 package (Case 314B), with its metal tab internally connected to Pin 3 (GND). Its thermal resistance is θJA = 65 °C/W (free-air) and θJC = 5.0 °C/W. For reliable 5 A operation, a heatsink such as AAVID 5903B is recommended to maintain junction temperature below 150 °C under worst-case ambient conditions.
How does the MC34167TG achieve 5.0 V output without external resistors?
The MC34167TG features an internal 5.05 V ±2% reference connected to the non-inverting input of its error amplifier. When the feedback (Pin 5) is tied directly to the output, the regulator self-adjusts to deliver 5.05 V - intentionally offset by +50 mV to compensate for typical 1% cable/connector drop, yielding precisely 5.0 V at the load point in well-designed layouts.
Does the MC34167TG support synchronous rectification?
No, the MC34167TG does not support synchronous rectification. It is designed to drive an external Schottky diode (e.g., 1N5825) in step-down and inverting topologies. Its switch output is an NPN collector, requiring a freewheeling path through a diode - not a second actively controlled switch. Synchronous operation would require external gate drivers and careful timing control beyond the IC's capabilities.
MC34167TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- 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
MC34167TG FAQ
1.How can I place an order for MC34167TG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34167TG 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 MC34167TG reliable?
The price and inventory of MC34167TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34167TG is usually 5 days.
3.What payment methods are accepted for MC34167TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34167TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34167TG?
MC34167TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34167TG 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 MC34167TG?
For technical support, including MC34167TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34167TG requirements.
6.How does Aetrix verify that MC34167TG is sourced from the original manufacturer or authorized distributors?
All MC34167TG 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 MC34167TG meets industry standards.
7.What is the process for return or replacement of MC34167TG?
All MC34167TG units undergo pre-shipment inspection (PSI). If there is an issue with MC34167TG, 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 MC34167TG part is unused and in its original packaging.
Return procedure for MC34167TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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