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Skyworks Solutions Inc. SKY87608-11-577LF
- Part No.:
- SKY87608-11-577LF
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
SKY87608-11-577LF.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,482
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Product details
Overview
SKY87608-11-577LF from Skyworks Solutions is a non-synchronous step-down DC-DC converter with 4.5 V to 28 V input range, internal 180 mΩ high-side N-channel MOSFET, fixed 450 kHz switching frequency, adjustable 0.9 V to 0.8×VIN output, and 3 A load capability-used in set-top boxes for local 5 V/3.3 V rail generation.
For engineers reviewing the SKY87608-11-577LF datasheet, SKY87608-11-577LF pinout, SKY87608-11-577LF application, or SKY87608-11-577LF equivalent, key selection criteria include input voltage range compatibility, external compensation flexibility, thermal shutdown threshold (160 °C), soft-start timing (4 ms), and SOP-8L-EP package layout requirements.
Technical Context
The SKY87608-11-577LF implements peak current-mode control with internal slope compensation optimized for duty cycles >50%, using an external bootstrap capacitor (BST–LX) to drive the high-side MOSFET. It integrates input under-voltage lockout (3.5–4.2 V) and cycle-by-cycle overcurrent protection with 5 A typical peak current limit.
Thermal shutdown activates at 160 °C with 15 °C hysteresis, and the 4 ms soft-start ramps the 0.9 V feedback reference while discharging on EN deassertion, UVLO dropout, or thermal fault-ensuring controlled power-up without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 28 V - supports wide industrial and distributed power inputs without pre-regulation. |
| Output Current | Up to 3 A - delivers full rated load with internal high-side MOSFET (RDS(ON) = 180 mΩ typ). |
| Switching Frequency | Fixed 450 kHz (380–520 kHz range) - enables compact magnetics and predictable EMI filtering. |
| Feedback Reference | 0.9 V ±2% - sets output via external resistor divider; accuracy maintained across –40 °C to +85 °C. |
| Shutdown Current | <1 µA - minimizes system standby power when EN is low. |
| Soft-Start Time | 4 ms typical - prevents inrush current without external capacitor. |
| Thermal Shutdown | 160 °C activation, 145 °C recovery - protects die and PCB during overload or poor heatsinking. |
Pinout & Package
SKY87608-11-577LF uses an 8-pin SOP-8L-EP package (MSL1, 260 °C reflow) with exposed paddle thermally connected to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply rail | Bypassed to GND with ≥10 µF ceramic; connects to source of internal high-side MOSFET and internal LDOs. |
| 2 LX | Switch node | Connects to inductor and Schottky diode cathode; carries high di/dt switching current. |
| 3 NC | No connect | Must remain unconnected and floating-no internal connection. |
| 4 GND | Analog and power ground | Common return for control circuitry and source of 12 Ω refresh MOSFET; tied to exposed paddle. |
| 5 FB | Feedback input | Senses output via resistive divider; regulates to 0.9 V reference; leakage <±0.2 µA. |
| 6 COMP | Error amplifier output | External RC network sets loop stability; supports type-II compensation for varied output capacitors. |
| 7 EN | Enable control | Logic-high (>1.7 V) enables regulation; logic-low (<0.4 V) forces shutdown with <1 µA quiescent current. |
| 8 BST | Bootstrap supply | Connects 0.1 µF ceramic capacitor to LX; sustains gate drive for high-side MOSFET during on-time. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side MOSFET | 180 mΩ RDS(ON) eliminates external switch and reduces BOM count. |
| Internal refresh MOSFET | 12 Ω device ensures reliable boot capacitor recharge regardless of output voltage level. |
| Adjustable output voltage | Set from 0.9 V to 80% of VIN using two external resistors-supports multiple rail configurations. |
| External compensation | COMP pin allows full loop tuning for ceramic, tantalum, or electrolytic output capacitors. |
| Robust protection suite | Includes UVLO, cycle-by-cycle current limit, and thermal shutdown with auto-recovery. |
Applications
| Set-Top Box Power Rails | Distributed Industrial Power |
|---|---|
Use Scenario: Generating stable 3.3 V and 5 V rails from 12 V or 24 V intermediate bus in cable/satellite STBs. IC Role / Device Role / Timing Role: Primary non-synchronous buck regulator delivering up to 3 A per rail with fixed 450 kHz switching. Use Value: High efficiency (up to 97%) and integrated MOSFET reduce heat and board area versus discrete solutions. | Use Scenario: Local point-of-load conversion in programmable logic controllers (PLCs) and I/O modules with wide input variation. IC Role / Device Role / Timing Role: Step-down controller handling 4.5–28 V input transients common in 24 V industrial systems. Use Value: UVLO (3.5–4.2 V) and thermal shutdown (160 °C) ensure operation through brownouts and ambient temperature extremes. |
| Industrial Motor Drive Logic Supply | Embedded Networking Equipment |
Use Scenario: Providing isolated logic supply for gate drivers and microcontrollers in motor inverters. IC Role / Device Role / Timing Role: Secondary buck stage converting 15–20 V intermediate rail to 3.3 V for digital control circuits. Use Value: Adjustable output (0.9 V to 0.8×VIN) and external compensation enable stable regulation despite variable input and load dynamics. | Use Scenario: Powering FPGA I/O banks and Ethernet PHYs in edge routers and switches. IC Role / Device Role / Timing Role: Efficient 3 A buck converter operating at 450 kHz to minimize EMI near high-speed serial interfaces. Use Value: Low 4 ms soft-start prevents bus droop during hot-plug events; <1 µA shutdown current supports deep sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar non-synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 36 V max input, 2 A output, 2 MHz switching, no internal refresh MOSFET | Higher frequency enables smaller inductors but requires external bootstrap diode; lower current rating | Preferred for space-constrained designs needing >1 MHz operation; not drop-in due to pinout and bias differences |
| TPS5430DDAR | 36 V max input, 3 A output, 500 kHz switching, integrated BOOT diode, no refresh MOSFET | Requires external bootstrap diode; lacks dedicated refresh path for low-VOUT startup | Valid alternative for 3 A loads where 0.9 V feedback and refresh MOSFET are not required |
Compared with MP2451DT-LF-Z and TPS5430DDAR, the SKY87608-11-577LF uniquely integrates a 12 Ω refresh MOSFET to guarantee reliable boot capacitor recharge at low output voltages, enabling robust startup from 0.9 V without external components-critical for industrial and set-top box applications with variable VOUT.
Availability
SKY87608-11-577LF is available at Aetrix Electronics and suitable for set-top boxes, distributed power systems, and industrial applications requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for SKY87608-11-577LF 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
Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless, automotive, and industrial markets.
The SKY87608-11-577LF belongs to Skyworks' high-efficiency DC-DC converter product line, designed specifically for industrial and consumer power systems demanding wide input range, integrated power stages, and robust fault protection.
FAQ
What is the maximum input voltage rating for the SKY87608-11-577LF?
The SKY87608-11-577LF has an absolute maximum input voltage (IN to GND) of +30 V, with recommended operating range from 4.5 V to 28 V. Exceeding 30 V may cause permanent damage. The device includes input under-voltage lockout (UVLO) that disables operation below 3.5 V (rising edge) to prevent erratic behavior during brownout conditions. This UVLO threshold has 200 mV hysteresis for clean turn-on/turn-off transitions.
Does the SKY87608-11-577LF require an external bootstrap diode?
No, the SKY87608-11-577LF does not require an external bootstrap diode. It integrates an internal diode that charges the BST–LX bootstrap capacitor during the LX low phase. A 0.1 µF ceramic capacitor must be placed directly between BST and LX pins. The internal 12 Ω refresh MOSFET further ensures reliable boot capacitor recharge-even at low output voltages-eliminating need for external diodes or charge pumps used in competing controllers.
What is the purpose of the NC pin on the SKY87608-11-577LF?
Pin 3 of the SKY87608-11-577LF is designated NC (No Connect) and must remain unconnected and floating-there is no internal connection. Connecting this pin to any voltage or ground may compromise device reliability or cause malfunction. The NC designation is confirmed in Table 1 of the preliminary datasheet and applies strictly to the SKY87608-11-577LF SOP-8L-EP package configuration.
How does the SKY87608-11-577LF achieve output voltage adjustment?
The SKY87608-11-577LF achieves output voltage adjustment using an external resistive divider connected between VOUT, FB, and GND. The FB pin regulates to a precise 0.9 V reference, so VOUT = 0.9 V × (1 + RFB1/RFB2). The datasheet provides Table 5 with standard resistor values for outputs from 1.5 V to 20 V. Output is adjustable from 0.9 V minimum up to 80% of VIN, enabling flexible rail generation without trimming or DAC control.
What thermal protection features does the SKY87608-11-577LF include?
The SKY87608-11-577LF includes thermal shutdown that disables switching when junction temperature reaches 160 °C (typical), with automatic restart once temperature falls below 145 °C (15 °C hysteresis). Its SOP-8L-EP package has a θJA of 41 °C/W on a 1 inch² FR4 board. Maximum power dissipation is 2.8 W at 25 °C, derating by 27 mW/°C above ambient-enabling reliable operation in sealed industrial enclosures up to +85 °C ambient.
SKY87608-11-577LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 22.4V
- Current - Output:
- 3A
- Frequency - Switching:
- 450kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP-EP
SKY87608-11-577LF FAQ
1.How can I place an order for SKY87608-11-577LF through Aetrix?
Please submit a Request for Quotation (RFQ) for SKY87608-11-577LF 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 SKY87608-11-577LF reliable?
The price and inventory of SKY87608-11-577LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SKY87608-11-577LF is usually 5 days.
3.What payment methods are accepted for SKY87608-11-577LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SKY87608-11-577LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SKY87608-11-577LF?
SKY87608-11-577LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SKY87608-11-577LF 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 SKY87608-11-577LF?
For technical support, including SKY87608-11-577LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SKY87608-11-577LF requirements.
6.How does Aetrix verify that SKY87608-11-577LF is sourced from the original manufacturer or authorized distributors?
All SKY87608-11-577LF 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 SKY87608-11-577LF meets industry standards.
7.What is the process for return or replacement of SKY87608-11-577LF?
All SKY87608-11-577LF units undergo pre-shipment inspection (PSI). If there is an issue with SKY87608-11-577LF, 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 SKY87608-11-577LF part is unused and in its original packaging.
Return procedure for SKY87608-11-577LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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