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onsemi MC34163DW
- Part No.:
- MC34163DW
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC34163DW.pdf
- Description:
- IC REG BUCK BST ADJ 3.4A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,599
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Product details
Overview
MC34163DW 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, cycle-by-cycle current limiting, and thermal shutdown. Used in cost-sensitive consumer, automotive, and industrial power supplies requiring minimal external components.
For engineers reviewing the MC34163DW datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, validated SOIC-16W package mapping, confirmed 16-pin terminal roles, real-world efficiency data (up to 81.2% with bootstrap), and two technically documented alternative parts for topology-flexible design reuse.
Technical Context
The MC34163DW operates as a fixed on-time, variable off-time voltage-mode ripple regulator with internal 1.25 V/0.55 V sawtooth thresholds, 225 µA charge / 25 µA discharge oscillator current, and 9:1 charge-to-discharge ratio. Its dual feedback comparators support independent voltage regulation (5.05 V nominal) and low-voltage indicator (1.125 V threshold with 15 mV hysteresis).
It implements cycle-by-cycle current limiting via an Ipk sense input referenced to VCC, with 250 mV threshold and ±0.4 µA input bias. The separately pinned driver collector, switch collector/emitter, and bootstrap input enable saturation control and Darlington configuration for optimized efficiency in step-down/inverting topologies.
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 high-current step-down converters delivering up to 3.0 A at 5.05 V (tested) |
| Oscillator Frequency | 45–55 kHz - fixed-frequency operation simplifies EMI filtering and inductor selection |
| Reference Accuracy | ±2% over temperature - ensures stable output regulation across 0°C to +70°C ambient range |
| Standby Supply Current | 6.0–10 mA - low quiescent draw suitable for always-on subsystems |
| LVI Output Sink Capability | 10 mA - directly drives microprocessor reset inputs without external buffer |
| Thermal Shutdown Threshold | +150°C junction - protects against sustained overload or poor heatsinking |
Pinout & Package
The MC34163DW is housed in a heat-tab-enhanced SOIC-16W (Case 751G) surface-mount package with pins 4, 5, 12, and 13 forming the thermal ground tab for improved PCB heat conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LVI) | Low Voltage Indicator Output | Open-collector output sinking up to 10 mA; asserts low when VFB2 < 1.07 V |
| 2 (VFB2) | Feedback Comparator 2 Input | Non-inverting input biased at 1.25 V internally; used for LVI or secondary regulation |
| 3 (VFB1) | Feedback Comparator 1 Input | Non-inverting input for main output regulation; 5.05 V nominal setpoint |
| 4, 5, 12, 13 (GND) | Ground / Thermal Tab | Four dedicated ground pins forming a copper heat tab; must be soldered to large PCB copper area |
| 6 (CT) | Oscillator Timing Capacitor | Connects external capacitor to set oscillator frequency (e.g., 680 pF → ~50 kHz) |
| 7 (VCC) | Power Supply Input | Primary supply rail; powers internal circuitry and bootstrap source (2.5–40 V) |
| 8 (Ipk Sense) | Current Limit Sense Input | Monitors voltage drop across RSC; trips at 250 mV above VCC |
| 9 (Bootstrap Input) | Bootstrap Bias Source | Internal 2.0 mA current source clamped at VCC + 7.0 V; reduces VCE(sat) in step-down mode |
| 10 (Switch Emitter) | Output Switch Emitter | Emitter of integrated NPN switch; connected to inductor/rectifier node in buck/inverting topologies |
| 11 (Switch Collector) | Output Switch Collector | Collector of integrated NPN switch; connects to input supply in buck, to ground in boost |
| 14, 15 (Driver Collector) | Driver Output Collector | Separate collector terminals for external Darlington or current-boost configurations |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.4 A switch with Darlington option | Enables high-current DC-DC conversion without external transistor in most designs; Darlington mode extends current capability beyond 3.4 A |
| Bootstrap input with zener clamp | VCC + 7.0 V internal clamp allows safe bootstrapping to reduce VCE(sat) and improve efficiency by up to 4.5% (measured) |
| Dual independent feedback comparators | One comparator (VFB1) sets main output; second (VFB2) provides LVI or auxiliary regulation without shared reference path |
| Cycle-by-cycle current limiting | Hardware-based per-cycle protection prevents switch failure during short-circuit or overload without software intervention |
| Thermal shutdown with latch behavior | Auto-shutdown at +150°C junction; latched-off state requires power cycle to recover - prevents thermal runaway |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Generating stable 5.05 V @ 3.0 A from 12 V vehicle battery for display controller and audio codec. IC Role / Device Role / Timing Role: Primary step-down switching regulator with integrated 3.4 A switch and bootstrap-driven efficiency optimization. Use Value: Achieves 81.2% efficiency at full load (vs. 76.7% without bootstrap), reducing thermal stress in confined dashboard enclosures. | Use Scenario: Providing isolated -12 V @ 1.0 A from 12 V field bus for analog sensor signal conditioning. IC Role / Device Role / Timing Role: Voltage-inverting regulator using separate emitter/collector pins and Schottky rectification. Use Value: Delivers ±0.02% line regulation and 130 mVpp ripple - sufficient for 16-bit ADC reference stability. |
| Consumer Set-Top Box PSU | Medical Portable Device Backup |
Use Scenario: Stepping up 5 V USB input to 28 V @ 600 mA for LCD backlight driver in compact enclosure. IC Role / Device Role / Timing Role: Step-up converter with precision 5.05 V feedback reference and LVI monitoring of input rail. Use Value: Maintains 88.1% efficiency and ±0.05% line regulation across 9–16 V input - critical for universal AC adapter compatibility. | Use Scenario: Monitoring main 3.3 V system rail and asserting reset to MCU when voltage drops below 3.0 V. IC Role / Device Role / Timing Role: Low-voltage indicator function using internal 1.125 V comparator with 15 mV hysteresis. Use Value: Provides clean, glitch-free reset assertion with 10 mA sink drive - eliminates need for external supervisor IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33163DW | Wider operating ambient range (−40°C to +85°C) vs. MC34163DW (0°C to +70°C); identical pinout, electrical specs, and package | Suitable for extended-temperature industrial or automotive under-hood use where MC34163DW's 0°C lower limit is insufficient | Select MC33163DW when ambient operation below 0°C is required; otherwise MC34163DW remains valid for commercial-grade applications |
| LM2577-ADJ | Fixed-frequency PWM (52 kHz), higher typical efficiency (85–90%), but no integrated LVI output or dual feedback comparators | Better for high-efficiency step-up only; lacks MC34163DW's topology flexibility (buck/boost/invert) and microprocessor interface capability | Choose LM2577-ADJ when maximizing efficiency in boost-only designs is primary; retain MC34163DW when multi-topology support or LVI integration is needed |
Compared with MC33163DW, the MC34163DW trades extended temperature range for lower cost and qualification scope, while versus LM2577-ADJ it sacrifices peak efficiency for broader topology support and built-in system monitoring features - making it optimal for cost-constrained, multi-rail embedded power designs.
Availability
MC34163DW is available at Aetrix Electronics and suitable for automotive infotainment power, industrial sensor node supply, and consumer set-top box PSU requiring stable component supply and long-term BOM continuity.
Supply support for MC34163DW 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 MC34163DW belongs to the MC34163 series of monolithic switching regulators, designed specifically to simplify step-up, step-down, and inverting DC-DC converter implementation with minimal external components in cost-sensitive applications.
FAQ
What is the maximum output current achievable with the MC34163DW in a step-down configuration?
The MC34163DW delivers up to 3.0 A continuous output current in step-down mode, as verified in the datasheet's Figure 21 test results (5.05 V/3.0 A). This assumes proper PCB copper heatsinking per Figure 18, use of bootstrap configuration to minimize VCE(sat), and thermal derating above +50°C ambient. Peak switch current remains limited to 3.4 A regardless of topology.
Can the MC34163DW operate from a 3.3 V input supply?
Yes, the MC34163DW supports input voltages down to 2.5 V, including 3.3 V operation. However, the datasheet specifies that below 3.0 V, the bootstrap input (Pin 9) must be connected directly to VCC instead of the bootstrap capacitor network to ensure reliable driver biasing and avoid startup failure.
How does the low voltage indicator (LVI) output of the MC34163DW interface with a microcontroller?
The MC34163DW LVI output (Pin 1) is an open-collector NPN transistor capable of sinking ≥10 mA. To interface with a microcontroller, connect Pin 1 to the MCU's reset or interrupt pin through a pull-up resistor (e.g., 10 kΩ to VDD). When VFB2 falls below 1.07 V, the LVI asserts low - providing direct hardware reset signaling without external logic.
What is the purpose of the separate Driver Collector pins (14 and 15) on the MC34163DW?
The MC34163DW's Driver Collector pins (14 and 15) provide independent access to the driver stage output, enabling external Darlington or current-boost configurations. When connected with Pins 9–11, they allow the internal driver to control an external high-current transistor - extending peak switch current beyond the integrated 3.4 A limit while retaining cycle-by-cycle current limiting and thermal protection.
Is the MC34163DW still recommended for new designs?
No - according to the official onsemi datasheet (Rev. 9, April 2025), the MC34163DW is discontinued and not recommended for new designs. The MC34163DWR2G tape-and-reel variant remains orderable, but designers should consider migration paths such as the MC33163DW (same footprint, extended temperature range) or newer alternatives like the NCP3063 for long-term supply assurance.
MC34163DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MC34163DW FAQ
1.How can I place an order for MC34163DW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34163DW 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 MC34163DW reliable?
The price and inventory of MC34163DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34163DW is usually 5 days.
3.What payment methods are accepted for MC34163DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34163DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34163DW?
MC34163DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34163DW 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 MC34163DW?
For technical support, including MC34163DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34163DW requirements.
6.How does Aetrix verify that MC34163DW is sourced from the original manufacturer or authorized distributors?
All MC34163DW 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 MC34163DW meets industry standards.
7.What is the process for return or replacement of MC34163DW?
All MC34163DW units undergo pre-shipment inspection (PSI). If there is an issue with MC34163DW, 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 MC34163DW part is unused and in its original packaging.
Return procedure for MC34163DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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