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onsemi MC34167D2TG
- Part No.:
- MC34167D2TG
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MC34167D2TG.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,926
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Product details
Overview
MC34167D2TG from onsemi is a fixed-frequency, voltage-mode switching regulator IC designed for step-down, step-up/down, and voltage-inverting 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 stable regulation in automotive power supplies and industrial embedded converters.
For engineers reviewing the MC34167D2TG datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning of key specs, validated D2PAK package interface details, and two confirmed alternative parts for cost, temperature, or packaging trade-offs.
Technical Context
The MC34167D2TG implements voltage-mode PWM control using an internal error amplifier (80 dB gain, 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) that drives a latching comparator to set duty cycle up to 95%, with blanking during CT discharge to prevent multiple pulses per cycle.
Protection architecture includes undervoltage lockout (startup at 5.9 V with 0.9 V hysteresis), cycle-by-cycle current limiting (6.5 A typical threshold), and thermal shutdown (activation at ~170°C). Standby mode reduces supply current to 36 µA when compensation pin voltage drops below 150 mV - enabling low-power sequencing and soft-start via external capacitor charging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Rating | 5.0 A continuous output capability supports ≥30 W step-down designs at 12 V input without external MOSFET. |
| Oscillator Frequency | 72 kHz fixed frequency enables predictable EMI filtering and simplifies magnetics selection for 10–100 µH inductors. |
| Reference Voltage | 5.05 V ±2% (25°C) provides accurate feedback threshold; 50 mV margin compensates for typical 1% cable drop in 5 V systems. |
| Input Voltage Range | 7.5 V to 40 V operation covers 12 V automotive battery transients and industrial 24 V rails without pre-regulation. |
| Duty Cycle Range | 0% to 95% allows full regulation range from near-zero to just below Vin in buck configurations. |
| UVLO Threshold | 5.9 V startup with 0.9 V hysteresis prevents oscillation during brown-out conditions and ensures clean power-on reset. |
| Thermal Shutdown | Internal protection activates at ~170°C junction temperature - requires heatsinking for >2 W dissipation in D2PAK package. |
Pinout & Package
MC34167D2TG uses the surface-mount D2PAK (Case 936A) package with exposed drain pad thermally connected to Pin 3. The 5-pin layout supports high-current switching with low-inductance grounding and compact PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Comp) | Compensation node | Output of error amplifier; connects to RC network (RF/CF) for loop stability - clamping below 150 mV enables 36 µA standby mode. |
| Pin 2 (FB) | Voltage feedback input | High-impedance node comparing output divider voltage to 5.05 V reference; bias current ≤1.0 µA minimizes divider resistor loading. |
| Pin 3 (GND) | Power ground / heatsink tab | Common return for all internal circuits and thermal path; must be soldered to large copper area for thermal management (θJC = 5.0°C/W). |
| Pin 4 (VCC) | Power supply input | Accepts 7.5–40 V; powers internal circuitry and gate drive - UVLO disables output until ≥5.9 V is reached. |
| Pin 5 (SW) | Switch collector output | NPN Darlington output stage; sinks up to 5.0 A; saturation voltage ≤(VCC −1.5) V enables efficient high-side switch implementation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0 A switch | Eliminates need for external power transistor in ≤30 W buck/inverting converters - reduces BOM count and layout complexity. |
| Fixed 72 kHz oscillator | Enables consistent EMI profile and eliminates external timing components - CT capacitor not required for basic operation. |
| 5.05 V ±2% reference | Supports precise 5.0 V output without trimming; 50 mV offset accommodates typical interconnect losses in automotive harnesses. |
| Cycle-by-cycle current limit | Protects switch under short-circuit or overload by limiting peak current to 6.5 A - avoids thermal runaway during fault conditions. |
| Standby mode (36 µA) | Reduces system quiescent current during sleep states - enables battery-powered applications with multi-day standby life. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V to 5 V Power Supply |
|---|---|
|
Use Scenario: Regulating 12 V battery input to stable 5.0 V for microcontroller, CAN transceiver, and sensor interfaces in door modules. IC Role / Device Role / Timing Role: Primary step-down controller with integrated switch; handles load dump transients up to 40 V and cold-crank down to 6 V. Use Value: Eliminates external MOSFET and gate driver; ±2% reference ensures reliable MCU reset and ADC accuracy across temperature. |
Use Scenario: Converting unregulated 24 V industrial rail to isolated 5 V logic supply for PLC I/O modules operating in 0–70°C ambient. IC Role / Device Role / Timing Role: Fixed-frequency buck controller driving external Schottky rectifier; supports continuous conduction mode for high efficiency at full load. Use Value: 72 kHz switching enables small magnetics; 95% max duty cycle maintains regulation even at minimum input voltage (7.5 V). |
| Voltage-Inverting Converter for RS-232 Bias | Triple-Output Off-Line Preconverter |
|
Use Scenario: Generating −12 V from 12 V input for RS-232 line drivers in embedded communication gateways. IC Role / Device Role / Timing Role: Inverting topology controller with ground-referenced feedback; uses internal 5.05 V reference to regulate negative output. Use Value: Resolves emitter swing limitation via ground pin relocation; achieves ±0.61% line regulation and 79.5% efficiency at 1.7 A. |
Use Scenario: High-efficiency 125 W AC-DC preconverter feeding multiple downstream MC34167 post-regulators in distributed power systems. IC Role / Device Role / Timing Role: Core controller in self-oscillating flyback stage; regulates 24 V intermediate bus with 90% efficiency. Use Value: Enables isolation and multiple independent outputs; D2PAK package supports high-current primary winding connections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33167D2TG | Wider operating temperature range (−40°C to +85°C) vs. MC34167D2TG (0°C to +70°C); identical electrical specs and pinout. | Suitable for under-hood automotive or outdoor industrial deployments requiring extended temperature tolerance. | Select MC33167D2TG when ambient exceeds 70°C or storage below 0°C is required - no layout or firmware changes needed. |
| LM2596S-5.0 | Lower current rating (3.0 A vs. 5.0 A), lower frequency (150 kHz), integrated synchronous rectification, and fixed 5.0 V output only. | Better suited for low-power consumer adapters where size and cost outweigh high-current capability. | Choose LM2596S-5.0 only for ≤15 W applications with strict board space constraints - not drop-in for MC34167D2TG's 5 A loads. |
Compared with MC34167D2TG, MC33167D2TG offers identical functionality with extended temperature support, while LM2596S-5.0 trades current capacity and topology flexibility for integration and footprint reduction - making it unsuitable for high-power or inverting designs.
Availability
MC34167D2TG is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24 V power conversion, and voltage-inverting RS-232 bias supplies requiring stable component supply and long-term manufacturability.
Supply support for MC34167D2TG 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, and sensing technologies for automotive, industrial, and cloud infrastructure markets.
The MC34167 series belongs to onsemi's legacy monolithic switching regulator product line, engineered for cost-sensitive, high-reliability DC-DC conversion in automotive and industrial environments where robustness and wide input range are critical.
FAQ
What is the maximum output current capability of the MC34167D2TG?
The MC34167D2TG features an integrated NPN Darlington output switch rated for 5.0 A continuous collector current. Electrical characteristics confirm a typical current limit threshold of 6.5 A, with saturation voltage ≤(VCC −1.5) V at 5.0 A. Actual achievable output current depends on thermal design - the D2PAK package has θJC = 5.0°C/W, so proper heatsinking is essential above ~2 W dissipation.
Does the MC34167D2TG require an external timing capacitor?
No, the MC34167D2TG does not require an external timing capacitor. Its 72 kHz oscillator uses an internal trimmed current source and on-chip timing components, eliminating the need for external CT. This simplifies design and improves frequency stability across temperature and voltage - unlike variable-frequency controllers that rely on external RC networks.
Can the MC34167D2TG be used in voltage-inverting configurations?
Yes, the MC34167D2TG is explicitly designed for voltage-inverting applications. Figure 23 in the datasheet shows a validated −12 V/1.7 A inverting converter. Key implementation requirements include relocating the IC ground pin to the negative output rail to keep the switch emitter positive relative to GND and maintain error amplifier functionality - achieving ±0.61% line regulation and 79.5% efficiency.
What is the purpose of the Comp (Pin 1) terminal on the MC34167D2TG?
The Comp (Pin 1) terminal is the error amplifier output and serves as the compensation node for the control loop. It connects to an external RC network (RF and CF) between Pins 1 and 5 to stabilize the feedback loop. Critically, pulling Pin 1 below 150 mV places the MC34167D2TG into low-power standby mode, reducing supply current to 36 µA - enabling soft-start and system-level power sequencing.
How does the undervoltage lockout (UVLO) function on the MC34167D2TG?
The MC34167D2TG's UVLO activates when VCC falls below 5.9 V (typical) during power-up, holding the output switch disabled until the threshold is exceeded. It includes 0.9 V hysteresis, so turn-off occurs at ~5.0 V during power-down - preventing erratic switching near the threshold. This ensures clean start-up and protects downstream circuitry from unstable regulation during brown-out conditions.
MC34167D2TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Bulk
- Product Status:
- Last Time Buy
- 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:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
MC34167D2TG FAQ
1.How can I place an order for MC34167D2TG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34167D2TG 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 MC34167D2TG reliable?
The price and inventory of MC34167D2TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34167D2TG is usually 5 days.
3.What payment methods are accepted for MC34167D2TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34167D2TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34167D2TG?
MC34167D2TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34167D2TG 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 MC34167D2TG?
For technical support, including MC34167D2TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34167D2TG requirements.
6.How does Aetrix verify that MC34167D2TG is sourced from the original manufacturer or authorized distributors?
All MC34167D2TG 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 MC34167D2TG meets industry standards.
7.What is the process for return or replacement of MC34167D2TG?
All MC34167D2TG units undergo pre-shipment inspection (PSI). If there is an issue with MC34167D2TG, 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 MC34167D2TG part is unused and in its original packaging.
Return procedure for MC34167D2TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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