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onsemi MC34163PG
- Part No.:
- MC34163PG
- Manufacturer:
- onsemi
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MC34163PG.pdf
- Description:
- IC REG BUCK BST ADJ 3.4A 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,406
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Product details
Overview
MC34163PG from onsemi is a monolithic switching regulator IC designed for step-up, step-down, and voltage-inverting dc-dc converter applications. It integrates a 3.4 A output switch, temperature-compensated 2% reference, controlled-duty-cycle oscillator, bootstrap-capable driver, cycle-by-cycle current limiting, and thermal shutdown. It operates from 2.5 V to 40 V input and delivers stable regulation in cost-sensitive industrial power supplies.
For engineers reviewing the MC34163PG datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, validated 16-pin DIP package mapping, confirmed dual feedback comparator architecture, exact thermal shutdown threshold (170°C), and two field-validated alternative parts with documented parameter-level differences.
Technical Context
The MC34163PG implements fixed on-time, variable off-time voltage-mode ripple regulation using an internal sawtooth oscillator (45–55 kHz) with 1.25 V peak / 0.55 V valley thresholds and 9:1 charge/discharge current ratio. Its dual high-impedance feedback comparators support independent voltage monitoring: FB1 (5.05 V nominal reference) for main output regulation and FB2 (1.25 V internal bias) for low-voltage indicator triggering.
Current limiting is enforced via a dedicated Ipk Sense comparator with 250 mV threshold and ≤200 ns propagation delay, while thermal protection activates at ~170°C to force latch-set shutdown. The bootstrap input (Pin 8) enables reduced VCE(sat) by sourcing 2.0 mA up to VCC + 7.0 V, with internal zener clamping and external capacitor timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 40 V - supports wide-input industrial and automotive battery-fed systems without pre-regulation. |
| Switch Current Rating | 3.4 A peak - enables direct drive of medium-power converters without external boost transistors in most 3 A-class designs. |
| Oscillator Frequency | 45–55 kHz - sets practical inductor size and EMI profile for non-isolated dc-dc topologies. |
| Reference Accuracy | ±2% over temperature - ensures stable output regulation across 0°C to +70°C ambient range. |
| Current Sense Threshold | 250 mV - defines RSC = 0.0735 Ω for 3.4 A limit, enabling precise overcurrent protection with minimal power loss. |
| LVI Input Threshold | 1.125 V with 15 mV hysteresis - provides clean microprocessor reset signaling without external comparator circuitry. |
| Thermal Shutdown | ~170°C junction - protects die during sustained overload or inadequate heatsinking without requiring external sensors. |
Pinout & Package
The MC34163PG is housed in a 16-pin plastic dual-in-line package (DIP-16) with integrated heat tab (Case 648C), where Pins 4, 5, 12, and 13 form the thermally enhanced ground plane for PCB copper heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LVI Output | Open-collector reset signal capable of sinking ≥6 mA - directly interfaces with µP reset inputs without pull-up resistor. |
| 2 | Voltage Feedback 2 | Non-inverting input for LVI comparator (1.125 V internal reference) - used for system brown-out detection. |
| 3 | Voltage Feedback 1 | Non-inverting input for main regulator comparator (5.05 V nominal reference) - accepts resistor-divided output voltage. |
| 4, 5, 12, 13 | GND | Common ground and thermal conduction path - must be soldered to large copper area for RJC = 15°C/W performance. |
| 6 | Timing Capacitor | Connects external CT to set oscillator frequency and on-time - requires low-ESR capacitor for stable ramp generation. |
| 7 | VCC | Main supply input (2.5–40 V) - powers internal circuitry and bootstrap source; also connects to external bootstrap capacitor. |
| 8 | Ipk Sense | Current-limit comparator input - monitors voltage drop across RSC to enforce 250 mV trip point. |
| 9 | Bootstrap Input | Drives internal 2.0 mA current source above VCC - reduces switch saturation voltage when configured with external RC network. |
| 10, 11 | Switch Emitter / Collector | High-current NPN output transistor terminals - support grounded-emitter (step-down/inverting) or emitter-follower (step-up) configurations. |
| 14, 15 | Driver Collector / Switch Collector | Separate collector outputs allow Darlington or single-transistor switch implementation - enables design flexibility for gain vs. speed trade-offs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent feedback comparators | FB1 (5.05 V ref) regulates main output; FB2 (1.25 V ref) enables LVI function - eliminates need for external supervisor IC. |
| Bootstrap-capable driver | Sources 2.0 mA up to VCC + 7.0 V - reduces VCE(sat) by ~40% in step-down/inverting topologies, improving efficiency by 4–5%. |
| Cycle-by-cycle current limiting | 250 mV threshold with ≤200 ns response - prevents switch destruction during short-circuit or startup surge without delaying normal operation. |
| Thermal shutdown with latch | Activates at ~170°C junction - forces hard shutdown until power cycle, preventing thermal runaway in enclosed or poorly ventilated enclosures. |
| Low standby current | 6.0–10 mA ICC over full input range - minimizes quiescent loss in battery-powered or always-on systems. |
Applications
| Industrial Power Supply | Automotive DC-DC Converter |
|---|---|
|
Use Scenario: 12 V battery input converted to regulated 5.05 V/3.0 A for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary switching regulator controlling inductor current via PWM duty cycle modulation in step-down topology. Use Value: Achieves 81.2% efficiency with bootstrap, ±0.02% load regulation, and 36 mVpp ripple - meets EN 61000-6-3 Class A conducted emissions limits. |
Use Scenario: 24 V truck battery stepped down to 5 V for infotainment head unit logic rails under cold-crank (6.5 V min) conditions. IC Role / Device Role / Timing Role: Wide-input buck controller with LVI output asserting reset during brown-out below 1.125 V. Use Value: Operates down to 2.5 V input; LVI hysteresis prevents reset chatter during transient dips; thermal shutdown prevents failure during cabin overheating. |
| Consumer Electronics Adapter | Test Equipment Power Module |
|
Use Scenario: AC/DC adapter generating isolated ±12 V rails for audio amplifier biasing using inverting topology. IC Role / Device Role / Timing Role: Inverting dc-dc controller regulating negative output via FB1 feedback loop with precision 2% reference. Use Value: Delivers -12 V/1.0 A with 77.5% efficiency and ±0.01% load regulation - eliminates need for linear post-regulators in low-noise analog stages. |
Use Scenario: Programmable bench power supply front-end converting 36 V input to adjustable 1.2–30 V output using step-up configuration. IC Role / Device Role / Timing Role: Step-up controller with external R1/R2 divider setting output voltage; LVI monitors input for undervoltage lockout. Use Value: Supports 28 V/600 mA output with 88.1% efficiency and <0.09% load regulation - enables compact, fanless design for portable test gear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33163DWG | Wider operating ambient range (−40°C to +85°C) and SOIC-16W surface-mount package - no heat tab, higher RJA (94°C/W). | Preferred for extended-temperature industrial or automotive ECUs where board space is constrained and thermal management uses PCB copper only. | Select MC33163DWG when ambient exceeds +70°C or SMT assembly is required; derate power dissipation due to lower thermal performance. |
| LM2577-ADJ | Fixed-frequency (52 kHz) flyback controller with internal 3.0 A switch, but lacks dual feedback comparators and LVI output. | Suitable for simpler step-up applications without brown-out detection or dual-rail regulation needs. | Choose LM2577-ADJ only for basic boost converters; MC34163PG remains superior for multi-function designs requiring LVI, inverting, or precise line/load regulation. |
Compared with MC33163DWG and LM2577-ADJ, the MC34163PG offers unique integration of LVI reset signaling, dual feedback paths, and DIP-16 heat-tab packaging - making it optimal for cost-sensitive, thermally demanding, or microprocessor-coordinated power systems where discrete supervision ICs must be avoided.
Availability
MC34163PG is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC converters, consumer electronics adapters, and test equipment power modules requiring stable component supply and long-term BOM continuity.
Supply support for MC34163PG 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 MC34163PG belongs to the MC3x163 series of monolithic switching regulators engineered for flexible, low-component-count dc-dc conversion in cost-sensitive applications - emphasizing thermal robustness, wide input range, and integrated protection features.
FAQ
What is the maximum output current capability of the MC34163PG?
The MC34163PG integrates a 3.4 A peak switch current rating, verified per its Absolute Maximum Ratings table. This enables direct drive of step-down, step-up, or inverting converters delivering up to 3.0 A continuous output (as demonstrated in Figure 21). Actual achievable current depends on thermal design, input/output voltage differential, and external component selection - particularly RSC (0.075 Ω for 3.4 A limit) and heatsinking of the DIP-16 heat tab pins.
Does the MC34163PG support both step-up and step-down topologies?
Yes, the MC34163PG is explicitly designed for step-up, step-down, and voltage-inverting dc-dc converter applications, as stated in its datasheet introduction and confirmed by Figures 21 (step-down), 23 (step-up), and 25 (inverting). Its flexible pinout - including separate switch emitter/collector and driver collector terminals - allows reconfiguration between topologies using standard external components like inductors, diodes, and feedback dividers.
What is the function of Pin 1 (LVI Output) on the MC34163PG?
Pin 1 is the Low Voltage Indicator (LVI) open-collector output, which asserts a logic-low signal when the FB2 input voltage falls below 1.125 V (with 15 mV hysteresis). This provides direct microprocessor reset signaling without external components. The output can sink ≥6 mA, allowing direct connection to µP reset pins via a pull-up resistor - a key differentiator from generic switching controllers lacking integrated supervision.
How does the bootstrap feature improve efficiency in the MC34163PG?
The MC34163PG's bootstrap input (Pin 9) sources a 2.0 mA current up to VCC + 7.0 V, reducing the output switch's saturation voltage (VCE(sat)) by ~40% in step-down and inverting configurations. As shown in Figure 21, this improves efficiency from 76.7% (no bootstrap) to 81.2% at 3.0 A load - directly lowering conduction losses and thermal stress on the IC and external components.
Is the MC34163PG still in active production?
The MC34163PG is marked as discontinued for new designs per onsemi's datasheet Note 6 (page 15), though legacy stock remains available. Aetrix Electronics maintains traceable inventory and supports lifecycle continuity planning, including cross-reference guidance to active alternatives like MC33163DWG for new designs requiring extended temperature range or surface-mount packaging.
MC34163PG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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):
- 2.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 40V (Switch)
- Current - Output:
- 3.4A (Switch)
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MC34163PG FAQ
1.How can I place an order for MC34163PG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34163PG 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 MC34163PG reliable?
The price and inventory of MC34163PG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34163PG is usually 5 days.
3.What payment methods are accepted for MC34163PG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34163PG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34163PG?
MC34163PG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34163PG 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 MC34163PG?
For technical support, including MC34163PG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34163PG requirements.
6.How does Aetrix verify that MC34163PG is sourced from the original manufacturer or authorized distributors?
All MC34163PG 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 MC34163PG meets industry standards.
7.What is the process for return or replacement of MC34163PG?
All MC34163PG units undergo pre-shipment inspection (PSI). If there is an issue with MC34163PG, 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 MC34163PG part is unused and in its original packaging.
Return procedure for MC34163PG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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