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onsemi MC33163PG
- Part No.:
- MC33163PG
- Manufacturer:
- onsemi
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MC33163PG.pdf
- Description:
- IC REG BUCK BST ADJ 3.4A 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,138
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Product details
Overview
MC33163PG from onsemi is a monolithic switching regulator IC designed for step-up, step-down, and 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 power in cost-sensitive industrial and automotive power supplies.
For engineers reviewing the MC33163PG datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design parameters, validated pin functions, confirmed alternative parts, and supply-chain support details specific to the MC33163PG SOIC-16W Pb-free package.
Technical Context
The MC33163PG implements a fixed-on-time, variable-off-time voltage-mode ripple control architecture-eliminating need for dominant-pole loop compensation. Its oscillator generates a sawtooth waveform (1.25 V peak / 0.55 V valley) using internal 225 µA charge / 25 µA discharge currents, enabling precise duty-cycle control up to 90%.
It features dual high-gain feedback comparators: one with 1.25 V internal reference (Pin 2 non-inverting input) for output regulation, and another with 1.125 V threshold (Pin 3) for low-voltage indicator (LVI) reset signaling. Current limiting is implemented via an Ipk sense comparator with 250 mV threshold referenced to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 40 V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Switch Current Rating | 3.4 A peak - enables direct drive of medium-power converters without external boost transistors. |
| Oscillator Frequency | 45–55 kHz - balances EMI control and inductor size; programmable via external timing capacitor (CT). |
| Reference Accuracy | ±2% over temperature - ensures tight output voltage regulation in step-down (5.05 V nominal) and step-up topologies. |
| LVI Threshold | 1.125 V with 15 mV hysteresis - provides clean microprocessor reset signaling without external hysteresis components. |
| Thermal Shutdown | Activates at ~170°C junction - protects against sustained overload or inadequate heatsinking in enclosed environments. |
| Standby Current | 6–10 mA - enables low-quiescent operation in battery-backed or always-on systems. |
Pinout & Package
The MC33163PG is housed in a 16-pin SOIC-16W (Case 751G) surface-mount package with exposed heat tab pins (Pins 4, 5, 12, 13) for enhanced thermal conduction to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LVI) | Low Voltage Indicator Output | Open-collector output sinking ≥6 mA - directly interfaces with µP reset inputs; requires external pull-up. |
| 2 (FB2) | Feedback Comparator 2 Input | Non-inverting input biased at 1.125 V - used for LVI sensing or secondary regulation path. |
| 3 (FB1) | Feedback Comparator 1 Input | Non-inverting input biased at 1.25 V - primary output voltage sensing node; high-impedance (±0.4 µA bias). |
| 4, 5, 12, 13 (GND) | Ground / Heat Tab | Four dedicated ground pins forming thermal heat tab - must be soldered to large copper pour for RJA ≤ 94°C/W. |
| 6 (CT) | Oscillator Timing Capacitor | Connects to external capacitor to set fOSC; internal 225 µA/25 µA current source defines ramp slope. |
| 7, 8 (VCC) | Power Supply Input | Dual VCC pins reduce IR drop; accepts 2.5–40 V - powers internal logic, reference, and driver circuits. |
| 9 (Ipk Sense) | Current Limit Sense Input | Monitors voltage across RSC; trips at 250 mV above VCC - enables cycle-by-cycle overcurrent protection. |
| 10 (Bootstrap) | Bootstrap Driver Input | Accepts bootstrapped voltage up to VCC + 7.0 V - reduces switch saturation voltage for higher efficiency. |
| 11 (Switch Emitter) | Output Switch Emitter | Emitter terminal of integrated NPN switch - connected to inductor/rectifier node in buck/inverting topologies. |
| 14, 15 (Switch Collector) | Output Switch Collector | Dual collector pins handle 3.4 A peak; tied internally - connects to input rail in buck, ground in boost/inverting. |
| 16 (Driver Collector) | Driver Output Collector | Separate driver collector - allows Darlington configuration or external transistor boosting beyond 3.4 A. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.4 A NPN Switch | Eliminates need for external power transistor in ≤30 W converters; supports buck, boost, and inverting topologies. |
| Bootstrap Driver Capability | Reduces VCE(sat) from 1.0 V to 0.6 V (at 2.5 A), improving efficiency by ~4.5% in buck designs (e.g., 12 V → 5 V @ 3 A). |
| Dual Independent Feedback Comparators | Enables simultaneous main output regulation (Pin 3) and system-level brown-out detection (Pin 2) without extra ICs. |
| Cycle-by-Cycle Current Limiting | Prevents switch destruction during short-circuit or startup surge - responds within 200 ns, independent of feedback loop. |
| Pb-Free SOIC-16W Package | RoHS-compliant 751G case with thermal pad pins - compatible with standard reflow profiles and IPC-A-610 Class 2/3 assembly. |
Applications
| Automotive Body Control Module (BCM) | Industrial Programmable Logic Controller (PLC) I/O Power |
|---|---|
Use Scenario: Regulating 12 V battery input to stable 5 V for microcontroller, CAN transceiver, and sensor interface rails in under-hood modules. IC Role / Device Role / Timing Role: Primary step-down DC-DC controller with integrated switch and LVI reset for cold-crank immunity. Use Value: Eliminates external MOSFET and gate driver; LVI output triggers MCU reset below 10.5 V battery, preventing firmware corruption. |
Use Scenario: Generating isolated 24 V → 5 V/3.3 V auxiliary supplies for digital I/O expansion cards in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: High-efficiency buck converter core with bootstrap-enhanced efficiency and thermal shutdown for fanless enclosures. Use Value: Achieves 81.2% efficiency at 3 A load (vs. 76.7% without bootstrap), reducing heatsink requirements in space-constrained modules. |
| Consumer Set-Top Box Power Supply | Medical Point-of-Care Device Battery Backup |
Use Scenario: Stepping down 19 V adapter input to 12 V for tuner and 3.3 V for SoC in compact STB designs. IC Role / Device Role / Timing Role: Dual-output capable controller (via FB1/FB2) supporting main rail and standby rail sequencing. Use Value: Single-chip solution replaces two discrete regulators; low 6 mA standby current extends sleep-mode battery life. |
Use Scenario: Inverting 3.7 V Li-ion battery to –5 V for analog front-end op-amps and ADC reference in portable diagnostics tools. IC Role / Device Role / Timing Role: Voltage-inverting regulator with precision 2% reference ensuring accurate sensor signal conditioning. Use Value: Delivers –12 V @ 1.0 A with 77.5% efficiency and <130 mVpp ripple - meets IEC 60601-1 EMC and accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34163DWG | Same die, but rated for 0°C to +70°C ambient (vs. MC33163PG's –40°C to +85°C); identical electrical specs and pinout. | Suitable for commercial-grade equipment only; not qualified for extended-temperature industrial or automotive use. | Select MC34163DWG only if operating temperature stays within 0–70°C and RoHS compliance is required. |
| LM2577-ADJ | Fixed-frequency PWM (52 kHz), 3 A switch, no LVI output, no dual feedback comparators; requires external compensation. | Better suited for simple step-up applications where reset signaling and dual regulation are unnecessary. | Choose LM2577-ADJ when designing cost-optimized boost-only supplies without brown-out monitoring or multi-rail needs. |
Compared with MC34163DWG, the MC33163PG offers wider temperature qualification and identical functionality; versus LM2577-ADJ, it provides integrated LVI, dual comparators, and superior thermal protection-making it preferable for robust, multi-function DC-DC designs.
Availability
MC33163PG is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and medical point-of-care devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC33163PG 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 sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC33163PG belongs to onsemi's legacy monolithic switching regulator product line, engineered for high-reliability, low-component-count DC-DC conversion in cost-sensitive and thermally constrained applications.
FAQ
What is the maximum operating junction temperature for the MC33163PG?
The MC33163PG incorporates internal thermal shutdown that activates at approximately 170°C junction temperature. While the absolute maximum rated junction temperature is +150°C per datasheet specifications, the thermal protection circuit engages earlier to prevent damage. This safeguard ensures safe operation even under sustained overload or insufficient PCB heatsinking, and is fully functional within the device's –40°C to +85°C ambient rating.
Can the MC33163PG be used in a step-up (boost) configuration?
Yes, the MC33163PG supports step-up operation as confirmed in Figure 23 of its official datasheet, delivering 28 V at 600 mA from a 12 V input with 88.1% efficiency. Its integrated 3.4 A switch, programmable oscillator, and dual feedback comparators enable robust boost topology implementation with minimal external components - including support for Schottky rectifier selection and timing capacitor optimization.
Does the MC33163PG require external compensation components?
No, the MC33163PG uses a fixed-on-time, variable-off-time voltage-mode ripple control architecture that inherently avoids stability issues associated with traditional voltage-mode PWM. As stated in the datasheet's Operating Description section, this method "does not require dominant pole loop compensation for converter stability." Designers can implement stable buck, boost, or inverting converters using only the recommended external timing capacitor, feedback resistors, and current-sense resistor - no compensation network needed.
What is the purpose of Pin 10 (Bootstrap Input) on the MC33163PG?
Pin 10 provides a bootstrap input to raise the internal 2.0 mA bias current source above VCC, reducing the output switch's saturation voltage from 1.0 V to 0.6 V (at 2.5 A). This directly improves converter efficiency - e.g., boosting step-down efficiency from 76.7% to 81.2% at 3 A load. The internal zener clamps boot voltage to VCC + 7.0 V, and the pin accepts external RC networks to sustain gate drive during high-duty-cycle operation.
Is the MC33163PG pin-compatible with the MC34163 series?
Yes, the MC33163PG is functionally and physically pin-compatible with the MC34163 series (e.g., MC34163DWG), sharing identical pinout, electrical characteristics, and SOIC-16W packaging. The key distinction is temperature rating: MC33163PG is specified for –40°C to +85°C operation, while MC34163 variants are rated for 0°C to +70°C. No PCB layout changes are required when substituting MC33163PG into existing MC34163 designs targeting extended temperature environments.
MC33163PG 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MC33163PG FAQ
1.How can I place an order for MC33163PG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33163PG 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 MC33163PG reliable?
The price and inventory of MC33163PG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33163PG is usually 5 days.
3.What payment methods are accepted for MC33163PG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33163PG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33163PG?
MC33163PG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33163PG 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 MC33163PG?
For technical support, including MC33163PG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33163PG requirements.
6.How does Aetrix verify that MC33163PG is sourced from the original manufacturer or authorized distributors?
All MC33163PG 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 MC33163PG meets industry standards.
7.What is the process for return or replacement of MC33163PG?
All MC33163PG units undergo pre-shipment inspection (PSI). If there is an issue with MC33163PG, 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 MC33163PG part is unused and in its original packaging.
Return procedure for MC33163PG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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