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onsemi MC33163DWR2
- Part No.:
- MC33163DWR2
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC33163DWR2.pdf
- Description:
- IC REG BUCK BST ADJ 3.4A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,008
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Product details
Overview
MC33163DWR2 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 5.05 V/3.0 A output in step-down configurations.
For engineers reviewing the MC33163DWR2 datasheet, pinout, applications, or equivalent options, key selection criteria include its wide input voltage range (2.5–40 V), high peak switch current (3.4 A), dual feedback comparators (1.25 V and 1.125 V thresholds), low-voltage indicator output for microprocessor reset, and SOIC-16W package with integrated heat tab for thermal management.
Technical Context
The MC33163DWR2 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) via 225 µA charge / 25 µA discharge currents, enabling precise duty-cycle control up to 90%.
Two independent high-impedance feedback comparators support flexible regulation: FB1 (non-inverting input at Pin 2, internal 1.25 V reference) enables adjustable output via resistor dividers; FB2 (Pin 3, internal 1.125 V threshold) serves as low-voltage indicator with 15 mV hysteresis and open-collector LVI output capable of sinking ≥6 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 40 V - supports wide-input industrial, automotive, and battery-powered systems without external pre-regulation. |
| Switch Current Rating | 3.4 A peak - enables high-power step-down (e.g., 5.05 V/3.0 A) and step-up (28 V/600 mA) topologies with minimal external components. |
| Oscillator Frequency | 45–55 kHz - programmable via timing capacitor CT; fixed charge/discharge ratio ensures stable operation across line and temperature. |
| Reference Accuracy | ±2% over temperature - guarantees tight output voltage regulation (e.g., ±0.06% line regulation in tested step-down design). |
| LVI Threshold | 1.125 V with 15 mV hysteresis - provides reliable microprocessor reset signaling under brown-out conditions without external hysteresis circuitry. |
| Thermal Shutdown | Activates at ~170°C - protects against catastrophic failure during overload or inadequate heatsinking; not intended as primary thermal management. |
| Standby Current | 6.0–10 mA - enables low-quiescent operation in always-on power rails while maintaining fast wake-up response. |
Pinout & Package
MC33163DWR2 is housed in a SOIC-16W (Case 751G) surface-mount package with exposed heat tab (Pins 4, 5, 12, 13) for enhanced thermal conduction. The package is Pb-free and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LVI) | Low Voltage Indicator Output | Open-collector output that sinks ≥6 mA when VFB2 < 1.125 V - directly interfaces with µP reset inputs without pull-up resistor. |
| 2 (FB2) | Feedback Comparator 2 Input | Non-inverting input for LVI function; internally biased at 1.125 V - used for system-level undervoltage detection. |
| 3 (FB1) | Feedback Comparator 1 Input | Non-inverting input for main regulation; internal 1.25 V reference - sets output voltage via external resistor divider (e.g., R1/R2 = 45k/15k for 5.05 V). |
| 4,5,12,13 (GND) | Ground Terminals | Four dedicated ground pins connected to internal heat tab - must be soldered to large copper pour for thermal performance (RJA = 94°C/W typical). |
| 6 (CT) | Oscillator Timing Capacitor | Connects external capacitor to set oscillator frequency and on-time - value (e.g., 680 pF) determines switching frequency and duty cycle. |
| 7,8 (VCC) | Power Supply Input | Primary supply input (2.5–40 V); Pin 8 also serves as bootstrap return - requires local 330 µF decoupling near Pins 7/8. |
| 9 (Ipk Sense) | Current Limit Sense Input | Monitors voltage drop across sense resistor RSC; trips at 250 mV - enables cycle-by-cycle current limiting (RSC = 0.075 Ω for 3.4 A peak). |
| 10 (Bootstrap Input) | Bootstrap Driver Supply | Accepts boosted voltage (up to VCC + 7.0 V) to reduce switch saturation voltage - improves efficiency by ~4.5% in step-down designs. |
| 14,15 (Switch Emitter/Collector) | Main Power Switch Terminals | High-current NPN output transistor terminals - emitter (Pin 14) and collector (Pin 15) are separately brought out to enable Darlington or saturated configurations. |
| 16 (Driver Collector) | Driver Output Collector | Drives external PNP/NPN boost transistors for >3.4 A applications - enables external current boosting per Figures 22–26. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent feedback comparators | Separate 1.25 V (FB1) and 1.125 V (FB2) references enable simultaneous output regulation and system-level brown-out detection. |
| Bootstrap-capable driver | Internal 2.0 mA current source and zener clamp (VZ = VCC + 7.0 V) reduce VCE(sat) - increases step-down efficiency from 76.7% to 81.2% at 3.0 A. |
| Cycle-by-cycle current limiting | 250 mV sense threshold with ±20 mV variation over temperature - provides robust short-circuit protection without external sensing ICs. |
| Thermal shutdown with latch | Triggers at ~170°C and holds output disabled until power cycle - prevents thermal runaway in enclosed or high-ambient environments. |
| SOIC-16W heat-tab package | Four center GND pins form thermal path to PCB copper - reduces RJA by 50% vs standard SOIC when using 2 oz copper heatsink (Figure 18). |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
Use Scenario: 12 V battery-fed 5 V/3 A rail powering PLC I/O modules and sensors in factory automation cabinets. IC Role / Device Role / Timing Role: Primary step-down switching regulator controlling output via FB1; LVI monitors battery sag to trigger controller reset before brown-out. Use Value: Eliminates need for external current-sense amplifier and reset supervisor IC - reduces BOM count and layout area by 30%. | Use Scenario: 24 V truck electrical system supplying 5 V to body control unit (BCU) microcontroller and CAN transceivers. IC Role / Device Role / Timing Role: Step-down regulator with bootstrap drive for high efficiency; LVI output asserts reset when battery drops below 10.8 V (90% of 12 V nominal). Use Value: Maintains µP operation down to 2.5 V input and survives load-dump transients up to 40 V - meets ISO 7637-2 Pulse 1/2/5a requirements. |
| Consumer DC-DC Converters | Test & Measurement Equipment |
Use Scenario: Portable audio amplifier requiring isolated -12 V/1.0 A rail from single 12 V Li-ion pack. IC Role / Device Role / Timing Role: Voltage-inverting regulator using FB1 for output regulation; separate switch emitter/collector pins enable optimal Schottky rectifier placement. Use Value: Achieves 77.5% efficiency with bootstrap and 130 mVpp ripple - meets Class D amplifier noise floor requirements. | Use Scenario: Bench power supply auxiliary rail generating 28 V/600 mA for op-amp biasing and sensor excitation. IC Role / Device Role / Timing Role: Step-up regulator with precision 2% reference ensuring stable excitation voltage; CT pin allows frequency tuning to avoid EMI bands. Use Value: Delivers ±0.05% line regulation and 88.1% efficiency - exceeds accuracy and efficiency specs for calibrated test equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34163DWR2G | Same die, wider operating ambient range (0°C to +70°C vs −40°C to +85°C); identical pinout and electrical specs. | Suitable for commercial-grade applications where extended temperature is not required. | Select MC34163DWR2G for cost-sensitive consumer designs with ambient ≤70°C. |
| LM2577-ADJ | Fixed-frequency PWM (52 kHz), no LVI output, lower peak switch current (3.0 A), different feedback topology (adjacent Vref pin). | Lacks integrated brown-out reset; requires external comparator for µP supervision. | Choose LM2577-ADJ only if LVI functionality is unnecessary and existing designs use its specific compensation network. |
Compared with MC34163DWR2G, the MC33163DWR2 offers extended temperature operation but shares identical switching performance and pin compatibility; versus LM2577-ADJ, it provides integrated LVI and tighter reference tolerance at the cost of slightly more complex feedback configuration.
Availability
MC33163DWR2 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, consumer DC-DC converters, and test & measurement equipment requiring stable component supply across extended temperature ranges.
Supply support for MC33163DWR2 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 MC33163 series belongs to onsemi's legacy monolithic switching regulator product line, engineered for cost-sensitive, high-reliability dc-dc conversion in harsh environments where wide input range and integrated protection are critical.
FAQ
What is the maximum output current achievable with the MC33163DWR2 in step-down configuration?
The MC33163DWR2 supports up to 3.0 A continuous output current in step-down mode, as validated in Figure 21 test data (5.05 V/3.0 A). This assumes proper thermal design using the SOIC-16W heat tab (Pins 4,5,12,13 soldered to ≥2 oz copper), 0.075 Ω sense resistor, and bootstrap drive. Peak switch current remains 3.4 A regardless of topology.
Does the MC33163DWR2 require external compensation components for stability?
No, the MC33163DWR2 uses a fixed on-time, variable off-time voltage-mode ripple control architecture that does not require dominant-pole loop compensation. Stability is inherently achieved through oscillator timing and feedback comparator behavior, eliminating external compensation networks required by traditional voltage-mode or current-mode controllers.
How is the low-voltage indicator (LVI) output configured and what load can it drive?
The LVI output (Pin 1) is an open-collector NPN transistor rated to sink ≥6.0 mA at 0.4 V saturation. It activates when FB2 (Pin 2) voltage falls below 1.125 V (with 15 mV hysteresis). It directly drives microprocessor reset inputs without external pull-up; for higher loads, add a 10 kΩ pull-up to VCC as shown in Figure 21.
Can the MC33163DWR2 be used in voltage-inverting applications, and what is the typical efficiency?
Yes, the MC33163DWR2 supports voltage-inverting topologies as demonstrated in Figure 25, delivering −12 V/1.0 A from 12 V input. Measured efficiency is 73.1% without bootstrap and 77.5% with bootstrap - enabled by separate switch emitter/collector pins and optimized Schottky rectifier (1N5822) integration.
What is the recommended minimum timing capacitor value for stable oscillator operation?
The MC33163DWR2 requires a minimum timing capacitor (CT) of 0.2 nF (200 pF) to maintain stable oscillator operation and consistent duty cycle. Values below this threshold cause nonlinear frequency response and reduced maximum duty cycle, as shown in Figure 2. For standard 45–55 kHz operation, 680 pF (Figure 21) or 620 pF (datasheet test condition) are recommended.
MC33163DWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MC33163DWR2 FAQ
1.How can I place an order for MC33163DWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33163DWR2 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 MC33163DWR2 reliable?
The price and inventory of MC33163DWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33163DWR2 is usually 5 days.
3.What payment methods are accepted for MC33163DWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33163DWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33163DWR2?
MC33163DWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33163DWR2 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 MC33163DWR2?
For technical support, including MC33163DWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33163DWR2 requirements.
6.How does Aetrix verify that MC33163DWR2 is sourced from the original manufacturer or authorized distributors?
All MC33163DWR2 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 MC33163DWR2 meets industry standards.
7.What is the process for return or replacement of MC33163DWR2?
All MC33163DWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC33163DWR2, 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 MC33163DWR2 part is unused and in its original packaging.
Return procedure for MC33163DWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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