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onsemi MC34163P
- Part No.:
- MC34163P
- Manufacturer:
- onsemi
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MC34163P.pdf
- Description:
- IC REG BUCK BST ADJ 3.4A 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,330
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Product details
Overview
MC34163P 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, and cycle-by-cycle current limiting. Used in cost-sensitive industrial power supplies requiring 2.5 V to 40 V input and up to 3.0 A output.
For engineers reviewing the MC34163P datasheet, pinout, applications, or equivalent options, key selection considerations include its dual feedback comparators (1.25 V and 1.125 V thresholds), LVI output for microprocessor reset, thermal shutdown at +150°C junction, and compatibility with DIP-16 heat-tab package for high-power dissipation.
Technical Context
The MC34163P operates as a fixed on-time, variable off-time voltage-mode ripple regulator with oscillator frequency set by external timing capacitor CT (e.g., 620 pF yields ~50 kHz). Its dual feedback comparators enable independent regulation of two outputs or precision low-voltage monitoring via the LVI comparator.
It features separate driver collector and switch emitter/collector terminals to support both non-Darlington (VCE(sat) = 0.6 V @ 2.5 A) and Darlington configurations. Current limiting is implemented via an internal comparator sensing voltage across RSC, with a precise 250 mV threshold and <200 ns propagation delay.
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 high-current step-down converters delivering ≥3.0 A at 5.05 V (tested). |
| Oscillator Frequency | 45–55 kHz typical - fixed-frequency operation simplifies EMI filtering and inductor selection. |
| Reference Voltage | 1.25 V (FB2) and 5.05 V (FB1) - dual thresholds allow direct 5 V regulation or programmable output via resistor divider. |
| LVI Threshold | 1.125 V with 15 mV hysteresis - provides clean microprocessor reset signaling without external hysteresis components. |
| Thermal Shutdown | +150°C junction - protects against sustained overload or inadequate heatsinking in enclosed environments. |
| Standby Current | 6.0–10 mA - low quiescent draw supports battery-backed or energy-conscious designs. |
Pinout & Package
The MC34163P 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 | Sinks ≥6 mA to generate logic-low reset pulse for microprocessors when supply drops below 1.125 V. |
| 2 (Voltage Feedback 2) | Non-inverting input to FB2 comparator | Accepts divided output voltage; internal 1.25 V reference enables precise regulation (e.g., 5.05 V via 45 kΩ/15 kΩ divider). |
| 3 (Voltage Feedback 1) | Non-inverting input to FB1 comparator | Direct connection point for 5.05 V output; pin 2 must be grounded if unused to prevent noise coupling. |
| 4, 5, 12, 13 (GND) | Power and signal ground planes | Four dedicated ground pins tied to internal heat tab - soldering all four to ≥30 mm² copper area halves RJA (to 15°C/W). |
| 6 (Timing Capacitor) | Oscillator ramp node | Connects to CT (e.g., 620 pF) to set switching frequency; external RDT adjusts duty cycle by increasing discharge current. |
| 7 (VCC) | Main supply input | Accepts 2.5–40 V; powers internal circuitry and bootstrap source - must be bypassed with ≥330 µF low-ESR capacitor. |
| 8 (Ipk Sense) | Current limit comparator input | Monitors voltage drop across RSC; trips at 250 mV to disable switch on cycle-by-cycle basis for overcurrent protection. |
| 9 (Bootstrap Input) | Driver bias boost node | Connected via RC network to switch emitter; raises internal 2.0 mA current source above VCC to reduce VCE(sat) by ~40%. |
| 10 (Switch Emitter) | Output switch emitter terminal | Exposed emitter allows external Darlington configuration or direct grounding in step-down topologies. |
| 11 (Switch Collector) | Output switch collector terminal | High-side switching node in buck; connects to inductor input in boost/invert - rated for −1.0 V to +40 V. |
| 14, 15 (Driver Collector) | Driver stage collector outputs | Separate terminals enable optimized drive strength: pin 14 for switch control, pin 15 for external transistor boosting >3.4 A. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent feedback comparators | Enables simultaneous regulation of primary output (via FB2) and auxiliary rail or LVI monitoring (via FB1), eliminating need for external supervisors. |
| Bootstrap-capable driver | Reduces switch saturation voltage from 1.0 V to 0.6 V (typical), improving efficiency by 4.5% in 12 V→5 V/3 A step-down (measured). |
| Cycle-by-cycle current limiting | 250 mV sense threshold with ±20 mV tempco ensures reliable overcurrent cutoff across −40°C to +85°C ambient without calibration. |
| Integrated low-voltage indicator | 1.125 V threshold with built-in 15 mV hysteresis eliminates external comparator and RC delay network for MPU reset generation. |
| Heat-tab DIP-16 package | RJC = 15°C/W (junction-to-case) allows 2.5 W continuous dissipation with 30 mm² PCB copper - no heatsink required for ≤75% duty cycle. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: 12 V battery-powered PLC I/O module requiring isolated 5 V and −12 V rails. IC Role / Device Role / Timing Role: MC34163P serves as main step-down controller for +5 V/3 A and inverting controller for −12 V/1 A, sharing single CT and feedback networks. Use Value: Dual topology support reduces BOM count by 2x vs. discrete controllers; measured 77.5% efficiency at −12 V/1 A eliminates need for secondary regulators. |
Use Scenario: Dashboard cluster with microcontroller, CAN transceiver, and LED backlight, powered from vehicle battery (9–16 V). IC Role / Device Role / Timing Role: MC34163P regulates 5 V for MCU/CAN and generates LVI reset signal synchronized to supply sag during cranking. Use Value: Integrated LVI eliminates external supervisor IC; 1.125 V threshold tracks battery dip to 9.0 V while maintaining clean reset assertion. |
| Consumer Set-Top Box | Point-of-Sale Terminal |
|
Use Scenario: AC-DC adapter-derived 12 V rail powering 3.3 V SoC core and 5 V peripherals in compact enclosure. IC Role / Device Role / Timing Role: MC34163P implements high-efficiency synchronous step-down (with external MOSFET) using driver collector pins 14/15. Use Value: Bootstrap capability achieves 81.2% efficiency at 3.0 A, reducing thermal load in sealed plastic housing versus non-bootstrapped design (76.7%). |
Use Scenario: Battery-backed retail terminal needing regulated 5 V during AC failure and brownout detection for graceful shutdown. IC Role / Device Role / Timing Role: MC34163P regulates 5 V from Li-ion pack (3.0–4.2 V) and asserts LVI output when voltage falls below 3.3 V (scaled via resistor divider). Use Value: Operation down to 2.5 V input enables full runtime from battery; LVI hysteresis prevents chatter during gradual discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34163DWG | SOIC-16W surface-mount package (Case 751G); RJA = 94°C/W vs. 80°C/W for P-suffix; same electrical specs. | Required for automated SMT assembly; unsuitable for through-hole prototyping or high-power thermal pads. | Select MC34163DWG only when board space constraints mandate SOIC and thermal load remains ≤1.2 W. |
| LM2577-5.0 | Fixed 5 V output; no dual feedback comparators or LVI output; 3 A switch; requires external diode. | Limited to single-output step-up; cannot implement inverting or dual-rail topologies without additional ICs. | Choose LM2577-5.0 only for simple 12 V→5 V boost where LVI and topology flexibility are unnecessary. |
Compared with MC34163DWG, the MC34163P offers superior thermal performance (15°C/W vs. 18°C/W RJC) and manual assembly compatibility; versus LM2577-5.0, it provides design flexibility at the cost of external component count for feedback and protection.
Availability
MC34163P is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, consumer set-top boxes, and point-of-sale terminals requiring stable component supply and long-term obsolescence management.
Supply support for MC34163P 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 MC34163P belongs to onsemi's legacy monolithic switching regulator family, engineered for cost-sensitive, high-reliability DC-DC conversion in applications where integration, thermal robustness, and multi-topology support outweigh ultra-high efficiency requirements.
FAQ
What is the maximum output current achievable with the MC34163P in step-down configuration?
The MC34163P delivers up to 3.0 A continuous output in step-down mode when properly heatsinked (e.g., 30 mm² copper on pins 4/5/12/13), as verified in Figure 21 test data. Peak switch current is rated at 3.4 A, but sustained >3.0 A requires external current boosting via pins 14/15 and an external transistor to avoid thermal shutdown.
Can the MC34163P generate a negative output voltage?
Yes, the MC34163P supports voltage-inverting topology, demonstrated in Figure 25 with −12 V/1.0 A output. It uses the same internal switch and oscillator, with feedback applied to pin 2 and polarity inversion achieved via inductor and diode placement - no external level-shifting components are needed.
How does the bootstrap function improve efficiency in the MC34163P?
The bootstrap input (pin 9) raises the internal driver bias above VCC, reducing the output switch's saturation voltage from 1.0 V to 0.6 V (typical). In the 12 V→5 V/3 A step-down test (Figure 21), this lowered conduction loss increased efficiency from 76.7% to 81.2%, directly extending thermal margin.
What is the purpose of the Low Voltage Indicator (LVI) output on pin 1?
The LVI output on pin 1 is an open-collector comparator that sinks ≥6 mA when the monitored voltage (typically scaled VCC) falls below 1.125 V. It provides a clean, hysteresis-stabilized reset signal for microprocessors - eliminating the need for external supervisor ICs in systems like automotive BCMs or POS terminals.
Is the MC34163P still in active production?
The MC34163P (DIP-16 package) is not listed as discontinued in the official onsemi documentation, unlike the MC34163DWG SOIC variant (marked DISCONTINUED on page 15). Aetrix Electronics maintains active inventory and long-term supply commitment for the P-suffix version, supporting legacy industrial and automotive designs.
MC34163P 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
MC34163P FAQ
1.How can I place an order for MC34163P through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34163P 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 MC34163P reliable?
The price and inventory of MC34163P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34163P is usually 5 days.
3.What payment methods are accepted for MC34163P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34163P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34163P?
MC34163P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34163P 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 MC34163P?
For technical support, including MC34163P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34163P requirements.
6.How does Aetrix verify that MC34163P is sourced from the original manufacturer or authorized distributors?
All MC34163P 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 MC34163P meets industry standards.
7.What is the process for return or replacement of MC34163P?
All MC34163P units undergo pre-shipment inspection (PSI). If there is an issue with MC34163P, 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 MC34163P part is unused and in its original packaging.
Return procedure for MC34163P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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