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onsemi MC33163P
- Part No.:
- MC33163P
- Manufacturer:
- onsemi
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MC33163P.pdf
- Description:
- IC REG BUCK BST ADJ 3.4A 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
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Product details
Overview
MC33163P 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 regulation in automotive body electronics power supplies.
For engineers reviewing the MC33163P datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for industrial and automotive embedded designs.
Technical Context
The MC33163P 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%.
It features dual high-impedance feedback comparators: one referenced to 1.25 V (for output voltage sensing at Pin 2), and another internally biased to 1.125 V (for low-voltage indicator at Pin 1). The current-limit comparator triggers at 250 mV across RSC, providing cycle-by-cycle protection independent of feedback loop stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 40 V - supports wide-range battery-fed systems including 12 V automotive and industrial 24 V rails. |
| Switch Current Rating | 3.4 A peak - enables direct drive of medium-power converters without external boost transistors in most step-down/inverting topologies. |
| Oscillator Frequency | 45–55 kHz - fixed-frequency operation simplifies EMI filtering and magnetics selection; programmable via CT capacitor. |
| Reference Accuracy | ±2% over temperature - ensures tight output regulation without trimming resistors in cost-sensitive consumer and automotive applications. |
| Thermal Shutdown Threshold | Typically 170°C - protects die during overload or poor heatsinking; latches off until junction cools below hysteresis threshold. |
| LVI Output Sink Current | ≥6 mA - directly drives standard microprocessor reset inputs without external pull-up or buffer stages. |
| Standby Supply Current | 6–10 mA - enables low-quiescent operation in always-on subsystems such as CAN gateway power rails. |
Pinout & Package
The MC33163P is housed in a 16-pin plastic dual-in-line package (DIP-16) with integrated heat tab (Case 648C), where Pins 4, 5, 12, and 13 form the thermally enhanced ground plane for PCB copper heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LVI) | Low Voltage Indicator Output | Open-collector output that sinks ≥6 mA when VFB2 falls below 1.125 V - used for microprocessor reset assertion. |
| 2 (VFB2) | Feedback Comparator 2 Input | Non-inverting input for LVI function; internal 1.125 V reference sets reset threshold at 90% of nominal supply. |
| 3 (VFB1) | Feedback Comparator 1 Input | High-impedance non-inverting input for main regulation; accepts resistor-divided output voltage or direct 5.05 V connection. |
| 4,5,12,13 (GND) | Ground Terminals | Four dedicated ground pins forming thermal heat tab - must be soldered to large copper area for RJA = 80°C/W performance. |
| 6 (CT) | Oscillator Timing Capacitor | Connects external capacitor to set oscillator frequency; internal 225 µA/25 µA current source defines ramp slope and duty cycle. |
| 7 (VCC) | Power Supply Input | Primary bias rail (2.5–40 V); powers internal circuitry and bootstrap source - requires local 0.1 µF bypass capacitor. |
| 8 (Ipk Sense) | Current Limit Sense Input | Monitors voltage drop across RSC; trips at 250 mV to disable switch on cycle-by-cycle basis - critical for short-circuit protection. |
| 9 (Bootstrap Input) | Bootstrap Driver Source | Supplies 2.0 mA current source clamped at VCC + 7.0 V - reduces switch saturation voltage in step-down/inverting configurations. |
| 10 (Switch Emitter) | Output Switch Emitter Terminal | Emitter of internal NPN switch - connects to inductor/rectifier node; allows Darlington or saturated configuration via external wiring. |
| 11 (Switch Collector) | Output Switch Collector Terminal | Collector of internal NPN switch - connects to input rail in step-down, to ground in step-up, or to inductor center-tap in inverting topologies. |
| 14,15 (Driver Collector) | Driver Output Collector | Separate collector terminals for driver stage - enables external transistor boosting beyond 3.4 A peak switch current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.4 A switch with Darlington/saturated mode options | Eliminates need for external power transistors in ≤3 A converters; configurable gain via Pin 9/10/11 wiring per Figure 22A/B. |
| Bootstrap-capable driver with VZ = VCC + 7.0 V clamp | Reduces VCE(sat) by ~40% in step-down topologies - improves efficiency from 76.7% to 81.2% at 3 A load (Fig. 21). |
| Dual independent feedback comparators | Enables simultaneous regulation (Pin 3) and system-level brownout detection (Pin 2) without shared reference or timing conflicts. |
| Cycle-by-cycle current limiting at 250 mV sense threshold | Provides deterministic overcurrent response within 200 ns propagation delay - prevents transformer saturation and MOSFET failure. |
| Thermal shutdown with 170°C trip and hysteresis | Prevents catastrophic die failure during sustained overload; self-recovery avoids manual reset requirement in sealed enclosures. |
Applications
| Automotive Body Control Module (BCM) Power Supply | Industrial PLC I/O Channel Regulator |
|---|---|
|
Use Scenario: Provides isolated 5.05 V/3 A rail from 12 V battery for microcontroller, CAN transceiver, and sensor interface circuits in door modules. IC Role / Device Role / Timing Role: Primary step-down switching regulator with integrated switch and bootstrap driver - manages transient load steps and cold-crank conditions. Use Value: Achieves 81.2% efficiency at full load with no external MOSFET, reducing BOM count and board space versus discrete solutions. |
Use Scenario: Generates stable −12 V/1.0 A output from 24 V DC bus to power analog signal conditioning and isolation amplifiers in modular I/O cards. IC Role / Device Role / Timing Role: Inverting topology controller with precision 1.25 V reference and low-noise feedback path - maintains ±0.01% load regulation. Use Value: Delivers 77.5% efficiency with bootstrap and achieves only 2.0 mV load regulation drift - meets SIL-2 functional safety margin requirements. |
| Consumer Set-Top Box Standby Converter | Medical Infusion Pump Auxiliary Rail |
|
Use Scenario: Supplies 28 V/600 mA for LCD backlight driver from 12 V input in energy-efficient standby mode with fast wake-up capability. IC Role / Device Role / Timing Role: Step-up regulator with LVI output tied to MCU reset pin - monitors input undervoltage during brownout events. Use Value: Enables 88.1% efficiency at light load and provides 15 mV hysteresis on LVI threshold - prevents false resets during line sags. |
Use Scenario: Powers motor driver gate drivers and op-amp bias rails in battery-operated infusion pumps requiring >10-year field reliability. IC Role / Device Role / Timing Role: Dual-function regulator: main output for analog circuitry and LVI output for watchdog-triggered safety shutdown. Use Value: Meets IEC 60601-1 creepage/clearance requirements via DIP-16 spacing; thermal shutdown prevents overheating in sealed housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34163DWG | Same silicon, but rated for 0°C to +70°C ambient (vs. −40°C to +85°C for MC33163P); identical pinout and electrical specs. | Not qualified for extended temperature automotive or industrial environments; suitable for commercial-grade consumer products only. | Select MC34163DWG only if operating ambient stays within 0–70°C and RoHS compliance is required (Pb-free SOIC-16W package). |
| LM2577-ADJ | Fixed-frequency PWM controller (52 kHz) with external NPN switch; no integrated switch or LVI output; requires external feedback divider. | Lacks integrated current limit sense and thermal shutdown; needs external components for brownout detection and overtemperature protection. | Choose LM2577-ADJ only when higher peak current (>5 A) or adjustable frequency is mandatory - adds complexity but supports wider input range (3.5–40 V). |
Compared with MC34163DWG, the MC33163P offers extended temperature range and identical functionality; compared with LM2577-ADJ, it reduces component count by integrating switch, current sense, LVI, and thermal protection - lowering design risk in safety-critical medical and automotive systems.
Availability
MC33163P is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, medical infusion pump auxiliary rails, and consumer set-top box standby converters requiring stable component supply across extended temperature ranges.
Supply support for MC33163P 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, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC33163P belongs to onsemi's legacy monolithic switching regulator product line, engineered for cost-sensitive, high-reliability dc-dc conversion in harsh-environment applications where integration, thermal robustness, and long-term supply stability are critical.
FAQ
What is the maximum operating junction temperature for the MC33163P?
The MC33163P features internal thermal shutdown that activates at approximately 170°C junction temperature. This protection mechanism forces the output latch into the "Set" state, disabling the internal switch until the die cools sufficiently. The device is rated for continuous operation up to +150°C junction temperature, with derating required above that point per its thermal resistance profile (RJA = 80°C/W for DIP-16).
Can the MC33163P be used in a step-up (boost) configuration?
Yes, the MC33163P supports step-up operation as confirmed in Figure 23 of its datasheet, delivering 28 V at 600 mA from a 12 V input with 88.1% efficiency. Its integrated switch, oscillator, and feedback comparators enable complete boost converter implementation with only external inductor, diode, capacitors, and resistor divider - no additional control ICs or gate drivers required.
Does the MC33163P require an external bootstrap capacitor?
The MC33163P includes an internal 2.0 mA bootstrap current source and zener clamp (VZ = VCC + 7.0 V), but an external bootstrap capacitor (CB) is mandatory for step-down and inverting topologies to sustain gate drive above VCC. Per datasheet Equation CB(min) = 4.0 mA × ton / 4.0 V, typical values range from 0.02 µF to 0.1 µF depending on oscillator frequency and duty cycle.
What is the purpose of Pin 2 (VFB2) on the MC33163P?
Pin 2 (VFB2) is the non-inverting input of the Low Voltage Indicator (LVI) comparator, which has an internal 1.125 V reference. When the voltage applied to Pin 2 drops below this threshold, the open-collector LVI output (Pin 1) pulls low to signal microprocessor reset. It provides hardware-level brownout detection independent of the main regulation loop at Pin 3.
How does the MC33163P achieve cycle-by-cycle current limiting?
The MC33163P monitors voltage across the external sense resistor RSC connected to Pin 8 (Ipk Sense). When this voltage exceeds 250 mV - corresponding to peak switch current - the current-limit comparator immediately sets the internal latch, terminating conduction for that oscillator cycle. This action occurs within 200 ns and repeats each cycle, preventing cumulative thermal stress during overload or short-circuit conditions.
MC33163P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MC33163P FAQ
1.How can I place an order for MC33163P through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33163P 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 MC33163P reliable?
The price and inventory of MC33163P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33163P is usually 5 days.
3.What payment methods are accepted for MC33163P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33163P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33163P?
MC33163P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33163P 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 MC33163P?
For technical support, including MC33163P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33163P requirements.
6.How does Aetrix verify that MC33163P is sourced from the original manufacturer or authorized distributors?
All MC33163P 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 MC33163P meets industry standards.
7.What is the process for return or replacement of MC33163P?
All MC33163P units undergo pre-shipment inspection (PSI). If there is an issue with MC33163P, 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 MC33163P part is unused and in its original packaging.
Return procedure for MC33163P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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