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onsemi MC34163DWR2G
- Part No.:
- MC34163DWR2G
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC34163DWR2G.pdf
- Description:
- IC REG BUCK BST ADJ 3.4A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,704
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Product details
Overview
MC34163DWR2G from onsemi is a monolithic step-up/step-down/inverting switching regulator IC with integrated 3.4 A output switch, 2.5–40 V input range, 2% precision reference, cycle-by-cycle current limiting, and low-voltage indicator output for microprocessor reset signaling. It enables compact dc-dc converter designs in cost-sensitive industrial and automotive power supplies.
For engineers reviewing the MC34163DWR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its SOIC-16W thermal performance, bootstrap-capable driver architecture, dual feedback comparators (1.25 V and 1.125 V thresholds), and verified operation down to 2.5 V supply voltage.
Technical Context
The MC34163DWR2G implements a fixed on-time, variable off-time voltage-mode ripple control architecture using an internal oscillator with programmable timing capacitor (CT) and 9:1 charge/discharge current ratio. Its dual high-gain comparators support independent regulation of main output and LVI threshold detection.
It integrates a temperature-compensated 2% reference, controlled-duty-cycle oscillator (45–55 kHz), bootstrap-input driver for reduced saturation voltage, and thermal shutdown at ~170°C. The output switch supports both non-Darlington (0.6 V VCE(sat) @ 2.5 A) and Darlington configurations 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 systems without pre-regulation |
| Switch Current Rating | 3.4 A peak - enables ≥3 A continuous output in step-down configuration with proper heatsinking |
| Oscillator Frequency | 45–55 kHz - sets practical inductor size and EMI profile for mid-power converters |
| Reference Accuracy | ±2% over temperature - ensures stable output regulation across 0°C to +70°C ambient |
| LVI Threshold | 1.125 V with 15 mV hysteresis - provides clean microprocessor reset signaling without external comparator |
| Standby Current | 6.0–10 mA - maintains low quiescent consumption in always-on subsystems |
| Thermal Resistance (RJA) | 94 °C/W (SOIC-16W) - requires ≥30 mm² copper pour on 2 oz PCB for 1.5 W dissipation at TA = 50°C |
Pinout & Package
MC34163DWR2G is housed in a thermally enhanced SOIC-16W (Case 751G) package with exposed heat tab pins (4, 5, 12, 13) soldered to PCB copper for improved junction-to-air thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LVI) | Low Voltage Indicator Output | Open-collector output sinking ≥6 mA - directly drives microprocessor RESET# with external pull-up |
| 2 (FB2) | Feedback Comparator 2 Input | Non-inverting input biased at 1.125 V - used for LVI monitoring or secondary regulation |
| 3 (FB1) | Feedback Comparator 1 Input | Non-inverting input biased at 1.25 V - primary output voltage sensing node |
| 4,5,12,13 (GND) | Ground Terminals | Four dedicated ground pins including heat tab connection - reduce thermal resistance and improve noise immunity |
| 6 (CT) | Oscillator Timing Capacitor | Connects external capacitor to set oscillator frequency and on-time - determines converter switching behavior |
| 7,8 (VCC) | Power Supply Input | Accepts 2.5–40 V - powers internal circuitry and bootstrap driver; pin 8 is primary VCC input |
| 9 (Ipk Sense) | Current Limit Sense Input | Monitors voltage drop across RSC - trips cycle-by-cycle current limit at 250 mV threshold |
| 10 (Bootstrap) | Bootstrap Driver Input | Connects to emitter via RC network - raises internal bias above VCC to reduce VCE(sat) by ~0.4 V |
| 11 (Switch Emitter) | Output Switch Emitter | Emitter terminal of integrated NPN switch - externally accessible for Darlington or external boost configurations |
| 14,15 (Switch Collector) | Output Switch Collector | Dual collector pins - paralleled for full 3.4 A rating; enable layout optimization and thermal spreading |
| 16 (Driver Collector) | Driver Output Collector | Drives external transistor base in boosted configurations - supports >3.4 A peak current with external switch |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent feedback comparators | 1.25 V (FB1) and 1.125 V (FB2) thresholds with ±0.03 V total variation - enable simultaneous main output regulation and system-level LVI monitoring |
| Bootstrap-capable driver | Internal 2.0 mA current source with VZ clamp at VCC+7.0 V - reduces switch saturation voltage by up to 0.4 V, improving efficiency by ~4.5% in step-down designs |
| Cycle-by-cycle current limiting | 250 mV sense threshold with ±20 mV variation over temperature - protects switch during overload without requiring external protection circuitry |
| Thermal shutdown | Activates at ~170°C junction temperature - prevents catastrophic failure under sustained overload or poor heatsinking |
| Pb-free SOIC-16W package | MSL Level 1 (unlimited floor life) - eliminates moisture sensitivity concerns during reflow assembly |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
Use Scenario: 12 V battery-powered sensor hub requiring isolated 5 V and -12 V rails. IC Role / Device Role / Timing Role: MC34163DWR2G serves as the core switching controller in a voltage-inverting topology generating -12 V/1.0 A with <±0.02% load regulation. Use Value: Eliminates need for separate negative-buck IC; achieves 77.5% efficiency with bootstrap and 1N5822 Schottky rectifier. | Use Scenario: Dashboard cluster with microcontroller needing reliable reset during cold-crank (6 V battery dip). IC Role / Device Role / Timing Role: MC34163DWR2G provides regulated 5.05 V output while its LVI pin asserts RESET# when VIN drops below 1.125 V × (R1+R2)/R2 ≈ 6.2 V. Use Value: Integrates power regulation and brown-out detection in single SOIC-16W package - reduces BOM count vs. discrete supervisor + regulator solution. |
| Consumer Set-Top Box Power | Point-of-Sale Terminal DC-DC Conversion |
Use Scenario: 24 V input powering 5 V/3 A logic rail and 28 V/600 mA backlight supply. IC Role / Device Role / Timing Role: MC34163DWR2G operates in step-down mode (5.05 V/3 A) and step-up mode (28 V/600 mA) using shared timing components and feedback networks. Use Value: Single IC replaces two regulators; achieves 81.2% efficiency with bootstrap and <±0.06% line regulation over 8–24 V input range. | Use Scenario: Battery-backed retail terminal requiring 3.3 V rail from Li-ion (3.0–4.2 V) or USB (5 V) input. IC Role / Device Role / Timing Role: MC34163DWR2G configured in step-down mode delivers 3.3 V/1.5 A with automatic input source selection via diode-OR front-end. Use Value: Supports ultra-low 2.5 V minimum input - enables operation down to nearly depleted Li-ion cells without buck-boost complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33163DWR2G | −40°C to +85°C operating range vs. MC34163DWR2G's 0°C to +70°C; identical electrical specs and pinout | Suitable for extended-temperature automotive or outdoor industrial use where ambient exceeds 70°C | Select MC33163DWR2G when full industrial temperature range is required; otherwise MC34163DWR2G offers cost advantage |
| LM2577-ADJ | Fixed-frequency (52 kHz) PWM vs. MC34163DWR2G's variable-off-time ripple control; 3 A switch vs. 3.4 A; no integrated LVI output | Requires external reset supervisor; optimized for step-up only; lacks dual feedback comparators | Choose LM2577-ADJ for simpler step-up-only designs where LVI integration is unnecessary and thermal margin is sufficient |
Compared with MC33163DWR2G, the MC34163DWR2G trades extended temperature range for lower cost in commercial-grade applications; compared with LM2577-ADJ, it offers integrated LVI, higher switch current, and flexible topology support at the expense of slightly more complex compensation.
Availability
MC34163DWR2G is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, consumer set-top box power, and point-of-sale terminal DC-DC conversion requiring stable component supply and long-term lifecycle support.
Supply support for MC34163DWR2G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC34163 series was designed as a cost-optimized, thermally robust monolithic switching regulator family targeting step-up, step-down, and inverting dc-dc converters in space-constrained commercial and industrial systems.
FAQ
What is the minimum operating input voltage for the MC34163DWR2G?
The MC34163DWR2G is specified to operate down to 2.5 V over its full temperature range. Figure 16 in the datasheet shows functional operation possible as low as 1.7 V at room temperature, but 2.5 V is the guaranteed minimum for parametric performance across 0°C to +70°C ambient. Below 3.0 V, the Bootstrap input must be connected directly to VCC instead of the emitter-referenced network.
How does the MC34163DWR2G implement current limiting?
The MC34163DWR2G uses cycle-by-cycle current limiting via its Ipk Sense pin (Pin 9). A sense resistor (RSC) placed between VCC and the switch collector develops a voltage proportional to peak switch current. When this voltage exceeds 250 mV (typical), the internal comparator triggers the latch to terminate that oscillator cycle's conduction. This mechanism protects the integrated switch during overload or short-circuit conditions without external circuitry.
Can the MC34163DWR2G drive external transistors for higher output current?
Yes, the MC34163DWR2G supports external current boosting via its Driver Collector (Pin 16) and Switch Emitter (Pin 11) terminals. Figures 22, 24, and 26 in the datasheet show validated NPN and PNP external switch configurations. In these setups, Pin 16 drives the base of an external transistor while Pin 11 serves as the emitter return path, enabling peak currents beyond the 3.4 A internal switch rating.
What is the purpose of the dual feedback comparators in the MC34163DWR2G?
The MC34163DWR2G contains two independent feedback comparators: FB1 (Pin 3) with 1.25 V internal reference for primary output voltage regulation, and FB2 (Pin 2) with 1.125 V internal reference for low-voltage indicator (LVI) functionality. Their outputs are OR'd internally, allowing either comparator to control the output switch latch - enabling simultaneous regulation and system-level brown-out detection in one device.
Is the MC34163DWR2G still recommended for new designs?
No - according to the "DISCONTINUED" note on page 15 of the datasheet, the MC34163DWR2G is not recommended for new designs. onsemi advises contacting their representative for alternatives. However, Aetrix Electronics maintains active inventory and supply chain support for legacy production programs requiring this part for continuity and repair.
MC34163DWR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MC34163DWR2G FAQ
1.How can I place an order for MC34163DWR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34163DWR2G 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 MC34163DWR2G reliable?
The price and inventory of MC34163DWR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34163DWR2G is usually 5 days.
3.What payment methods are accepted for MC34163DWR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34163DWR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34163DWR2G?
MC34163DWR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34163DWR2G 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 MC34163DWR2G?
For technical support, including MC34163DWR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34163DWR2G requirements.
6.How does Aetrix verify that MC34163DWR2G is sourced from the original manufacturer or authorized distributors?
All MC34163DWR2G 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 MC34163DWR2G meets industry standards.
7.What is the process for return or replacement of MC34163DWR2G?
All MC34163DWR2G units undergo pre-shipment inspection (PSI). If there is an issue with MC34163DWR2G, 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 MC34163DWR2G part is unused and in its original packaging.
Return procedure for MC34163DWR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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