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onsemi MC33163DWG
- Part No.:
- MC33163DWG
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC33163DWG.pdf
- Description:
- IC REG BUCK BST ADJ 3.4A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:146
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Product details
Overview
MC33163DWG 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. It operates from 2.5 V to 40 V input and delivers stable power in automotive body control modules requiring compact, thermally robust regulation.
For engineers reviewing the MC33163DWG datasheet, pinout, applications, or equivalent options, key selection criteria include its SOIC-16W heat-tab package thermal performance, dual feedback comparators (1.25 V and 1.125 V thresholds), LVI output for microprocessor reset signaling, and bootstrap-enabled efficiency boost in buck/inverting topologies.
Technical Context
The MC33163DWG implements fixed-on-time, variable-off-time voltage-mode ripple regulation using an internal 9:1 charge/discharge current ratio oscillator (45–55 kHz) with sawtooth valley/peak at 0.55 V / 1.25 V. Its dual feedback comparators enable independent regulation of main output (via Pin 2, 1.25 V reference) and low-voltage indicator (Pin 3, 1.125 V threshold with 15 mV hysteresis).
Current limiting is achieved via a dedicated comparator monitoring Ipk sense voltage across RSC, with a tightly specified 230–270 mV threshold over temperature. Thermal shutdown activates at ~170°C, and the output switch supports both non-Darlington (VCE(sat) = 0.6 V @ 2.5 A) and Darlington configurations (VCE(sat) = 1.0 V @ 2.5 A) via external pin wiring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 40 V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Switch Current Rating | 3.4 A peak - enables ≥3 A continuous output in step-down converters with proper heatsinking and bootstrap assist. |
| Oscillator Frequency | 45–55 kHz - sets practical inductor size and EMI profile for cost-sensitive consumer and automotive power supplies. |
| Reference Accuracy | ±2% over temperature - ensures stable 5.05 V nominal output with ≤50 mV error budget for cable-drop compensation. |
| LVI Threshold | 1.125 V with 15 mV hysteresis - provides clean, noise-immune reset assertion for 3.3 V or 5 V microcontrollers. |
| Thermal Shutdown | ~170°C junction - protects against sustained overload or inadequate PCB copper area without requiring external thermal sensors. |
| Standby Current | 6.0–10 mA - minimizes quiescent drain in always-on vehicle modules while maintaining fast wake-up response. |
Pinout & Package
MC33163DWG uses a 16-pin SOIC-16W (Case 751G) package with integrated heat tab connected to Pins 4, 5, 12, and 13 for enhanced thermal conduction to PCB copper. The exposed thermal pad requires soldering to ≥20 mm² of 2 oz copper for RJA ≤ 94°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LVI Output) | Open-collector reset signal | Sinks ≥6 mA to assert low-active reset on microcontrollers; requires external pull-up for logic-level compatibility. |
| 2 (VFB2) | Non-inverting input, LVI comparator | Monitors system supply rail; crossing 1.125 V triggers reset with built-in hysteresis to prevent chatter. |
| 3 (VFB1) | Non-inverting input, main feedback comparator | High-impedance (±0.4 µA) node for resistor-divider feedback; direct connection supports 5.05 V output without divider. |
| 4,5,12,13 (GND) | Ground terminals + thermal tab | Four dedicated ground pins form mechanical and thermal interface to PCB; must be soldered to large copper pour. |
| 6 (CT) | Oscillator timing capacitor node | Connects external capacitor (e.g., 680 pF) to set switching frequency; sensitive to layout parasitics. |
| 7 (VCC) | Main supply input | Accepts 2.5–40 V; powers internal circuitry and bootstrap source; bypass capacitor required near pin. |
| 8 (Ipk Sense) | Current limit comparator input | Monitors voltage drop across RSC; trip threshold 230–270 mV ensures accurate peak-current protection. |
| 9 (Bootstrap Input) | Bootstrap bias source | Internal 2 mA current source clamped at VCC+7.0 V; enables lower VCE(sat) in buck/inverting topologies. |
| 14,15 (Switch Emitter/Collector) | Output switch terminals | Separate emitter/collector pins allow flexible configuration: grounded-emitter (buck) or floating-emitter (inverting). |
| 16 (Driver Collector) | External driver stage collector | Enables Darlington connection for higher current drive; used with external transistor for >3.4 A peak loads. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent feedback comparators | 1.25 V main reference (Pin 2) and 1.125 V LVI threshold (Pin 3) enable simultaneous output regulation and system reset control. |
| Bootstrap-assisted driver | Internal 2 mA current source with VCC+7.0 V zener clamp reduces switch saturation voltage by ~0.4 V, improving efficiency 4–5% in buck designs. |
| Cycle-by-cycle current limiting | 250 mV ±20 mV sense threshold with <200 ns propagation delay ensures fast, reliable protection against short-circuit and overload faults. |
| Heat-tab SOIC-16W package | Thermal resistance RJA = 94°C/W (with 20 mm² 2 oz copper) enables 1.2 W dissipation at TA = 50°C - sufficient for 3 A buck converters without heatsink. |
| Wide-input operation down to 2.5 V | Functional operation verified to 1.7 V at room temperature; supports cold-crank automotive scenarios where battery dips below 6 V. |
Applications
| Automotive Body Control Module | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Regulating 12 V battery to stable 5.05 V for microcontroller, CAN transceiver, and LED drivers in door module. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing step-down topology with integrated 3.4 A switch and LVI reset for MCU supervision. Use Value: Eliminates need for external MOSFET and gate driver; LVI output directly interfaces with MCU reset pin without level-shifting. | Use Scenario: Generating isolated -12 V rail from 24 V factory bus to power analog sensor front-ends and op-amps. IC Role / Device Role / Timing Role: Voltage-inverting regulator using MC33163DWG's floating-emitter configuration and external Schottky rectifier. Use Value: Achieves 77.5% efficiency at 1.0 A load with only 6 external components; tight load regulation (±0.01%) ensures sensor accuracy. |
| Consumer USB-C Power Adapter | Medical Patient Monitor Auxiliary Rail |
Use Scenario: Stepping up 5 V USB input to 12 V for display backlight and fan drivers in portable diagnostic device. IC Role / Device Role / Timing Role: Step-up controller with external inductor, diode, and feedback divider; uses Pin 2 for precise 12 V regulation. Use Value: 88.1% efficiency at 600 mA reduces thermal stress in sealed enclosure; compact SOIC-16W fits tight board space. | Use Scenario: Providing clean, low-noise ±5 V rails from single 12 V supply for ECG amplifier stages and ADC references. IC Role / Device Role / Timing Role: Dual-rail generator using one MC33163DWG for +5 V (buck) and second for -5 V (inverting), sharing CT and VCC. Use Value: Matched feedback references (1.25 V) ensure symmetrical rail accuracy; <36 mVpp output ripple meets medical EMC requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2577-ADJ | Fixed-frequency (52 kHz) PWM controller with external NPN switch; no integrated LVI or dual feedback comparators. | Lacks integrated reset generation and separate LVI threshold; requires external comparator for supervisor functions. | Select when higher peak current (>5 A) is needed via discrete switch, and LVI functionality is implemented separately. |
| TPS5430DDAR | 3 A synchronous buck converter with integrated high-side MOSFET; 500 kHz switching; no inverting/step-up capability. | Only supports step-down topology; lacks voltage-inverting and step-up modes inherent to MC33163DWG architecture. | Choose for higher-efficiency, smaller-inductor 12 V-to-3.3 V conversion where topology flexibility is not required. |
Compared with LM2577-ADJ and TPS5430DDAR, MC33163DWG uniquely combines step-up/step-down/inverting capability, integrated LVI reset, and heat-tab SOIC packaging in a single monolithic IC - making it optimal for multi-rail, space-constrained automotive and industrial systems where topology agility and supervisor integration reduce BOM count.
Availability
MC33163DWG is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and medical auxiliary power supplies requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for MC33163DWG 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 manufacturer specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The MC33163DWG belongs to onsemi's legacy monolithic switching regulator product line, engineered for cost-sensitive, thermally demanding DC-DC applications where integration of switch, controller, and supervisor functions reduces external component count.
FAQ
What is the maximum output current achievable with MC33163DWG in a step-down configuration?
The MC33163DWG supports up to 3.4 A peak switch current. In a well-designed step-down converter with SOIC-16W thermal pad soldered to ≥20 mm² of 2 oz copper and bootstrap assist, continuous output current reaches 3.0 A at 81.2% efficiency (per Figure 21 test data). Exceeding this requires external current boosting per Figures 22A/B.
Does MC33163DWG support voltage-inverting topologies, and what external components are required?
Yes, MC33163DWG natively supports voltage-inverting operation using its floating-emitter switch configuration. Required external components include: inductor (e.g., 180 µH), Schottky rectifier (e.g., 1N5822), input/output capacitors, feedback resistors (R1=953 Ω, R2=8.2 kΩ for −12 V), current-sense resistor (0.075 Ω), and timing capacitor (470 pF), as validated in Figure 25.
How does the Low Voltage Indicator (LVI) output of MC33163DWG interface with a 3.3 V microcontroller?
The LVI output (Pin 1) is an open-collector sink capable of ≥6 mA. To interface with a 3.3 V MCU reset pin, connect a 10 kΩ pull-up resistor from Pin 1 to 3.3 V. When input voltage drops below 1.125 V (with 15 mV hysteresis), the output pulls low to assert reset - no level-shifter required due to direct logic compatibility.
What is the purpose of the bootstrap input (Pin 9) on MC33163DWG, and how is it implemented?
Pin 9 provides a 2 mA current source clamped at VCC+7.0 V to bias the internal driver above VCC, reducing output switch saturation voltage by ~0.4 V. Implementation requires a series resistor and capacitor from Pin 9 to the switch emitter; typical values are 10 Ω + 0.02 µF (Figure 21). This boosts efficiency 4–5% in buck/inverting topologies.
Is MC33163DWG still recommended for new designs, and what is its lifecycle status?
MC33163DWG remains active and available for new designs. Unlike MC34163DWG (discontinued per page 15), MC33163DWG is not marked as discontinued in the datasheet and is shipped in Pb-free SOIC-16W packaging with full manufacturer support and guaranteed long-term availability through onsemi distribution channels.
MC33163DWG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MC33163DWG FAQ
1.How can I place an order for MC33163DWG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33163DWG 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 MC33163DWG reliable?
The price and inventory of MC33163DWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33163DWG is usually 5 days.
3.What payment methods are accepted for MC33163DWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33163DWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33163DWG?
MC33163DWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33163DWG 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 MC33163DWG?
For technical support, including MC33163DWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33163DWG requirements.
6.How does Aetrix verify that MC33163DWG is sourced from the original manufacturer or authorized distributors?
All MC33163DWG 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 MC33163DWG meets industry standards.
7.What is the process for return or replacement of MC33163DWG?
All MC33163DWG units undergo pre-shipment inspection (PSI). If there is an issue with MC33163DWG, 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 MC33163DWG part is unused and in its original packaging.
Return procedure for MC33163DWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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