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onsemi MC34163DWR2
- Part No.:
- MC34163DWR2
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC34163DWR2.pdf
- Description:
- IC REG BUCK BST ADJ 3.4A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,354
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Product details
Overview
MC34163DWR2 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, and cycle-by-cycle current limiting. Used in cost-sensitive industrial power supplies requiring wide input (2.5 V to 40 V) and high peak current capability.
For engineers reviewing the MC34163DWR2 datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world converter topologies, thermal package behavior, bootstrap efficiency gains, and validated alternative options for legacy design continuity.
Technical Context
The MC34163DWR2 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 support independent regulation paths: FB1 (5.05 V internal reference) for main output control and FB2 (1.25 V threshold) for low-voltage indicator functionality.
Current limiting is implemented via an Ipk Sense input referenced to VCC with 250 mV threshold and ±0.4 µA bias current; thermal shutdown activates at ~170°C. The output switch uses a non-Darlington configuration (pins 14/15 emitter/collector) with VCE(sat) ≤ 1.0 V at 2.5 A, and bootstrap input (pin 9) enables reduced saturation voltage when driven above 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-fed systems without pre-regulation. |
| Switch Current Rating | 3.4 A peak - enables high-output-current step-down converters up to 3.0 A continuous (e.g., 5.05 V @ 3.0 A). |
| Oscillator Frequency | 45–55 kHz typical - sets practical inductor sizing (e.g., 180 µH for 12 V→5 V) and EMI profile. |
| Reference Accuracy | ±2% over line/temperature - ensures stable output regulation without trimming resistors in cost-sensitive designs. |
| LVI Threshold | 1.125 V with 15 mV hysteresis - provides reliable microprocessor reset signaling under brownout conditions. |
| Bootstrap Zener Clamp | VCC + 6.0 to VCC + 9.0 V - protects pin 9 during bootstrapping while enabling efficient switch drive. |
| Thermal Resistance (RJA) | 94 °C/W (SOIC-16W) - requires ≥30 mm copper heatsink area for >1 W dissipation at TA = 50°C. |
Pinout & Package
MC34163DWR2 is housed in a SOIC-16WB (Case 751G) surface-mount package with exposed heat tab pins (4, 5, 12, 13) for enhanced thermal conduction. Pin numbering follows standard SOIC-16W top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LVI Output | Open-collector reset signal sinking ≥6 mA - directly interfaces microcontroller reset inputs with programmable delay via RLVI/CDLY. |
| 2 | Voltage Feedback 2 | Non-inverting input for LVI comparator - monitors system rail; threshold set internally at 1.125 V. |
| 3 | Voltage Feedback 1 | Non-inverting input for main regulator comparator - accepts resistor-divided output voltage for precise 5.05 V or custom regulation. |
| 4, 5, 12, 13 | GND | Ground return and thermal heat tab - must be soldered to ≥30 mm² copper pour for thermal management. |
| 6 | Timing Capacitor | Oscillator ramp node - CT value (e.g., 680 pF) sets frequency and max duty cycle; RDT adds dead time. |
| 7 | VCC | Main supply input - powers internal circuitry; also used as bootstrap reference when pin 9 tied to VCC. |
| 8 | Ipk Sense | Current-limit comparator input - senses voltage drop across RSC; trips at 250 mV relative to VCC. |
| 9 | Bootstrap Input | Internal 2 mA current source node - drives external bootstrap capacitor to raise gate drive above VCC for lower VCE(sat). |
| 10 | Switch Emitter | Output switch emitter terminal - connected to GND in step-down, to inductor in step-up/inverting topologies. |
| 11 | Switch Collector | Output switch collector terminal - connects to input rail (step-down), inductor (step-up), or ground (inverting). |
| 14, 15 | Driver Collector | External driver transistor collector connection - enables external NPN/PNP boost for >3.4 A peak current. |
Key Features
| Feature | Design Value |
|---|---|
| Dual feedback comparators | Independent FB1 (5.05 V ref) and FB2 (1.25 V ref) enable simultaneous main regulation and system-level brownout detection. |
| Bootstrap-capable driver | Pin 9 current source + internal zener clamp allows VBE boosting, reducing VCE(sat) by ~0.4 V and improving efficiency up to 4.5% (e.g., 76.7% → 81.2%). |
| Cycle-by-cycle current limiting | 250 mV Ipk Sense threshold with <200 ns propagation delay ensures fast overcurrent protection without external sensing ICs. |
| Thermal shutdown | ~170°C activation with latch hold prevents thermal runaway during sustained overload or poor heatsinking. |
| Low standby current | 6.0–10 mA ICC over full 2.5–40 V range - enables operation in battery-backed systems with minimal quiescent drain. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: 12 V battery input converted to regulated 5.05 V for microcontroller and sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Primary step-down switching regulator controlling output via FB1; LVI pin triggers MCU reset during battery sag. Use Value: Achieves 81.2% efficiency with bootstrap, meets ±0.06% line regulation, and sustains 3.0 A load without external MOSFETs. | Use Scenario: 24 V truck battery stepped down to 5 V for body control unit logic, with brownout detection during cranking. IC Role / Device Role / Timing Role: Step-down controller with LVI monitoring main 24 V rail; hysteresis prevents reset chatter during transient dips. Use Value: Operates down to 2.5 V input, tolerates 40 V load dump, and delivers stable 5.05 V output with <50 mVpp ripple. |
| Consumer Inverter Power | Medical Portable Equipment |
Use Scenario: 12 V input inverted to -12 V for op-amp rails in portable test equipment. IC Role / Device Role / Timing Role: Voltage-inverting regulator using FB1 feedback; switch emitter floats to generate negative output. Use Value: Delivers 1.0 A at -12 V with 77.5% efficiency (bootstrap), ±0.01% load regulation, and 130 mVpp ripple. | Use Scenario: Battery-powered patient monitor requiring isolated 3.3 V and -5 V rails from single Li-ion cell (3.0–4.2 V). IC Role / Device Role / Timing Role: Step-up controller generating 5.05 V, then LDO-derived 3.3 V; LVI ensures safe shutdown below 3.2 V. Use Value: Starts reliably at 2.5 V input, maintains regulation during battery discharge, and provides fail-safe reset before deep discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33163DWR2G | Same architecture and pinout; wider operating ambient range (−40°C to +85°C vs. 0°C to +70°C for MC34163). | Suitable for extended-temperature automotive or outdoor industrial use where MC34163DWR2 is derated. | Select MC33163DWR2G when ambient exceeds 70°C or cold-start reliability below 0°C is required. |
| LM2577-ADJ | Fixed-frequency PWM (52 kHz), higher VCC max (60 V), but no LVI output or dual feedback comparators. | Lacks integrated brownout detection; requires external reset IC for microprocessor supervision. | Choose LM2577-ADJ only when higher input voltage (>40 V) or simpler single-feedback regulation suffices. |
Compared with MC34163DWR2, MC33163DWR2G offers broader temperature tolerance without layout change, while LM2577-ADJ trades integrated LVI and dual feedback for higher input voltage headroom and fixed-frequency control - making it less suitable for brownout-critical embedded systems.
Availability
MC34163DWR2 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, consumer inverter circuits, and medical portable equipment requiring stable component supply and legacy design support.
Supply support for MC34163DWR2 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 MC34163 series was developed as a cost-optimized, thermally robust monolithic switching regulator family targeting high-volume consumer, industrial, and automotive dc-dc conversion where minimal external components and integrated protection are critical.
FAQ
What is the maximum output current achievable with MC34163DWR2 in a step-down configuration?
The MC34163DWR2 supports up to 3.0 A continuous output current in step-down mode, as demonstrated in Figure 21 with 5.05 V/3.0 A output. This assumes proper heatsinking (≥30 mm² copper), bootstrap operation, and RSC = 0.075 Ω. Peak switch current remains limited to 3.4 A, so sustained loads above 3.0 A require external current boosting per Figures 22A/B.
Does MC34163DWR2 support both step-up and inverting topologies out of the box?
Yes, MC34163DWR2 natively supports step-up (Figure 23), step-down (Figure 21), and voltage-inverting (Figure 25) configurations using the same IC and core external components (inductor, diode, capacitors, RSC, CT). No internal configuration bits or firmware are needed - topology is defined entirely by external circuit connections.
How does the bootstrap function improve efficiency in MC34163DWR2 designs?
The bootstrap input (pin 9) raises the internal driver bias above VCC, reducing the output switch's VCE(sat) from ~1.0 V (non-bootstrapped) to ~0.6 V. In the Figure 21 step-down test, this lowered conduction loss increased efficiency from 76.7% to 81.2% at 3.0 A - a measurable 4.5% gain critical for thermal and battery-life constraints.
Can MC34163DWR2 operate from a 3.3 V input source?
Yes, MC34163DWR2 functions down to 2.5 V input, including 3.3 V systems. However, Figure 16 shows minimum operating voltage rises with temperature; at 70°C ambient, VCC(min) ≈ 2.6 V. For reliable 3.3 V operation across temperature, connect pin 9 (bootstrap) directly to VCC instead of using external bootstrap circuitry.
What is the purpose of the LVI output on MC34163DWR2, and how is it configured?
The LVI (Low Voltage Indicator) output is an open-collector signal that asserts low when the voltage at pin 2 falls below 1.125 V (with 15 mV hysteresis). It directly resets microprocessors without external components - configure with RLVI (e.g., 10 kΩ) and CDLY to set reset delay. Pin 2 monitors the system rail (e.g., 12 V via resistor divider), not the regulated output.
MC34163DWR2 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MC34163DWR2 FAQ
1.How can I place an order for MC34163DWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34163DWR2 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 MC34163DWR2 reliable?
The price and inventory of MC34163DWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34163DWR2 is usually 5 days.
3.What payment methods are accepted for MC34163DWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34163DWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34163DWR2?
MC34163DWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34163DWR2 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 MC34163DWR2?
For technical support, including MC34163DWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34163DWR2 requirements.
6.How does Aetrix verify that MC34163DWR2 is sourced from the original manufacturer or authorized distributors?
All MC34163DWR2 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 MC34163DWR2 meets industry standards.
7.What is the process for return or replacement of MC34163DWR2?
All MC34163DWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC34163DWR2, 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 MC34163DWR2 part is unused and in its original packaging.
Return procedure for MC34163DWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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