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Microchip Technology MIC4690YM-TR
- Part No.:
- MIC4690YM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC4690YM-TR.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,668
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Product details
Overview
MIC4690YM-TR from Micrel is an adjustable 500kHz synchronous buck regulator IC delivering up to 1A continuous output current in a power-SO-8 package, operating from 4V to 30V input with 1.23V feedback reference and integrated thermal shutdown, designed for compact 12V-to-5V/3.3V/2.5V/1.8V DC-DC conversion in industrial and embedded power supplies.
For engineers reviewing the MIC4690YM-TR datasheet, MIC4690YM-TR pinout, MIC4690YM-TR application, or MIC4690YM-TR equivalent, this page provides verified functional identity, confirmed SO-8 pin mapping, validated thermal and efficiency specs at 1A load, and two documented alternative regulators for adjustable 500kHz buck designs requiring ≥1A output and 4–30V input range.
Technical Context
The MIC4690YM-TR implements voltage-mode PWM control using a fixed 500kHz oscillator and internal 1.23V bandgap reference, with duty cycle adjusted via feedback voltage comparison against the sawtooth waveform. Its error amplifier drives an NPN output switch directly, eliminating external gate drivers.
Thermal management relies on a dedicated power-SO-8 package where pins 5–8 and the die-attach paddle form a unified thermal path, achieving θJC = 20°C/W and enabling 1A operation without heatsink when mounted on ≥6 cm² ground plane. Frequency foldback activates below 1.23V FB to limit short-circuit power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz ±5% - enables use of small 10–18 µH surface-mount inductors and reduces EMI filtering requirements. |
| Input Voltage Range | 4V to 30V continuous (34V transient) - supports wide-range industrial inputs including 12V and 24V rails with margin for transients. |
| Output Current | 1A continuous - sustained delivery verified across –40°C to +125°C junction temperature with proper PCB thermal layout. |
| Feedback Reference | 1.23V ±1% - sets output voltage via external resistor divider; enables precise 1.5V–5V adjustable regulation. |
| Efficiency | Up to 85% at 12VIN/5VOUT/1A - minimizes thermal load in space-constrained applications. |
| Protection Features | Thermal shutdown (160°C), overcurrent limit (1.3–3.0A), frequency foldback - ensures robust operation under fault conditions without external circuitry. |
| Quiescent Current | 12 mA typical in active mode; 1.5 µA in shutdown (VSHDN = VIN = 12V) - enables low-power standby capability. |
Pinout & Package
The MIC4690YM-TR is housed in a thermally enhanced 8-lead power-SO-8 (SOP-8 M) package with exposed die-attach paddle connected internally to GND pins 5–8, optimized for PCB heat sinking via large copper ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Shutdown control input | TTL-compatible enable: logic low (≤0.8V) activates regulator; logic high (≥1.5V) disables with <2 µA standby current. |
| 2 (VIN) | Main power input | Accepts 4–30V unregulated supply; withstands 34V transients; requires local 22 µF ceramic or tantalum bypass capacitor. |
| 3 (SW) | Power switch node | Drives external inductor and Schottky diode; carries high di/dt switching current; must be routed short and away from sensitive nodes. |
| 4 (FB) | Voltage feedback input | Compares output voltage (via resistor divider) to 1.23V reference; high-impedance input requiring guard ring and remote placement from SW node. |
| 5–8 (GND) | Power and signal ground | All four pins tied internally to die paddle; must connect to single-point, low-inductance ground plane ≥6 cm² for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NPN power switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity in 1A buck designs. |
| Internal compensation | Enables stable operation with only FB resistor divider and output capacitor-no external compensation network required. |
| Power-SO-8 thermal design | 20°C/W junction-to-case resistance allows 1A continuous operation with minimal PCB copper area, replacing TO-220/TO-263 footprints. |
| Frequency foldback protection | Reduces switching frequency to ~220 kHz during short-circuit, limiting power dissipation and preventing thermal runaway. |
| Wide input voltage range | Supports direct connection to 12V/24V industrial buses and automotive systems with transient tolerance up to 34V. |
Applications
| Hard Disk Drive Power Supply | Cable Modem DC-DC Conversion |
|---|---|
Use Scenario: Providing regulated 5V and 3.3V rails from a 12V input within space-constrained HDD electronics. IC Role / Device Role / Timing Role: Primary step-down regulator controlling output voltage via FB resistor divider; operates at fixed 500kHz for predictable EMI profile. Use Value: Replaces bulkier TO-220 regulators while maintaining 1A output and thermal reliability across –40°C to +125°C ambient. | Use Scenario: Generating stable 5V and 2.5V supplies for DOCSIS-compliant cable modem PHY and CPU subsystems. IC Role / Device Role / Timing Role: Adjustable buck converter configured for multiple output voltages using shared FB network; immune to input ripple from upstream AC/DC stage. Use Value: Delivers >85% efficiency at full load, reducing heat buildup in sealed plastic enclosures without forced airflow. |
| Industrial PLC I/O Module | Portable Test Equipment Power |
Use Scenario: Local 3.3V rail generation from 24V field bus in DIN-rail mounted programmable logic controller modules. IC Role / Device Role / Timing Role: Input-transient-tolerant buck regulator with shutdown control for power sequencing; uses frequency foldback to survive momentary shorts. Use Value: Withstands 34V transients common in industrial 24V systems and maintains regulation during brownouts down to 4V. | Use Scenario: Battery-powered handheld test instrument requiring low-noise, adjustable 1.8V/2.5V/3.3V outputs from Li-ion or 9V battery input. IC Role / Device Role / Timing Role: High-efficiency adjustable buck converter with ultra-low shutdown current (1.5 µA) to extend battery life in sleep mode. Use Value: Achieves 78% efficiency at 1.8V/1A from 7.4V input, minimizing thermal rise in palm-sized enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable 500kHz buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/NOPB | Fixed 5V output; 63V max input; 5A output; requires external compensation; larger TO-220-5 package. | Not adjustable; higher current capacity but incompatible for variable-output designs. | Select only if fixed 5V output and >1A load are required; not suitable as drop-in replacement for MIC4690YM-TR's adjustable topology. |
| TPS54202DRCT | Adjustable 2.5V–17V output; 400kHz–2.2MHz programmable frequency; 2A output; integrated FETs; 10-pin WSON package. | Higher frequency flexibility and current rating, but requires external soft-start and compensation components. | Choose when board space permits smaller WSON package and design requires programmable frequency or >1A output; not pin-compatible. |
Compared with LM2678-5.0/NOPB and TPS54202DRCT, the MIC4690YM-TR uniquely combines adjustable output, internal compensation, and 1A capability in a standard SO-8 footprint-making it optimal for cost-sensitive, space-constrained 4–30V input applications where fixed-frequency stability and minimal external parts are prioritized.
Availability
MIC4690YM-TR is available at Aetrix Electronics and suitable for industrial PLCs, cable modems, hard disk drives, and portable test equipment requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for MIC4690YM-TR 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
Micrel, Inc. was a U.S.-based analog and mixed-signal semiconductor company specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015.
The MIC4690YM-TR belongs to Micrel's SuperSwitcher™ family of integrated buck regulators, engineered specifically for high-current, low-profile DC-DC conversion in industrial and communications equipment where thermal performance and layout simplicity are critical.
FAQ
What is the maximum continuous output current of the MIC4690YM-TR?
The MIC4690YM-TR delivers 1A continuous output current across its full operating junction temperature range of –40°C to +125°C, provided the PCB includes ≥6 cm² ground plane connected to pins 5–8. This rating is validated per Micrel's SOA curve on page 6 of the datasheet and assumes 12V input and 5V output at 75% efficiency.
Does the MIC4690YM-TR require external compensation components?
No, the MIC4690YM-TR features internal compensation, eliminating the need for external Type-II or Type-III compensation networks. Stability is ensured with only the FB resistor divider and output capacitor; no additional capacitors or resistors on the COMP pin are required, simplifying layout and reducing BOM count.
What is the function of the SHDN pin on the MIC4690YM-TR?
The SHDN pin on the MIC4690YM-TR is a TTL-compatible shutdown input: applying ≤0.8V enables regulation, while ≥1.5V disables the internal switch and reduces quiescent current to 1.5 µA (at VSHDN = VIN = 12V). Hysteresis between ON and OFF thresholds prevents oscillation near the transition point.
Can the MIC4690YM-TR be used for positive-to-negative voltage conversion?
Yes, the MIC4690YM-TR can be configured as a positive-to-negative inverting buck-boost converter per Micrel's application note on page 9, using the same external components as the buck configuration but with modified inductor and diode connections. Output polarity inversion is achieved without adding extra ICs, though efficiency drops ~5–10% versus buck mode.
What thermal considerations apply to the MIC4690YM-TR's power-SO-8 package?
The MIC4690YM-TR's power-SO-8 uses pins 5–8 and the internal die paddle as a unified thermal path with θJC = 20°C/W. To maintain ≤125°C junction temperature at 1A, the PCB must provide ≥6 cm² ground plane area connected to those pins; insufficient copper causes thermal shutdown activation above 160°C as specified in the Electrical Characteristics table.
MIC4690YM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SuperSwitcher™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 27.9V
- Current - Output:
- 1A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MIC4690YM-TR FAQ
1.How can I place an order for MIC4690YM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4690YM-TR 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 MIC4690YM-TR reliable?
The price and inventory of MIC4690YM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4690YM-TR is usually 5 days.
3.What payment methods are accepted for MIC4690YM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4690YM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4690YM-TR?
MIC4690YM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4690YM-TR 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 MIC4690YM-TR?
For technical support, including MIC4690YM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4690YM-TR requirements.
6.How does Aetrix verify that MIC4690YM-TR is sourced from the original manufacturer or authorized distributors?
All MIC4690YM-TR 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 MIC4690YM-TR meets industry standards.
7.What is the process for return or replacement of MIC4690YM-TR?
All MIC4690YM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4690YM-TR, 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 MIC4690YM-TR part is unused and in its original packaging.
Return procedure for MIC4690YM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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