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Semtech Corporation SC2620SETRT
- Part No.:
- SC2620SETRT
- Manufacturer:
- Semtech Corporation
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SC2620SETRT.pdf
- Description:
- IC REG BUCK ADJ 2.3A DL 16SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SC2620SETRT from Semtech is a dual-channel, 30V-input, 2.3A integrated step-down DC-DC regulator with programmable switching frequency up to 1.4MHz per channel, current-mode control, and out-of-phase operation to reduce input ripple. It delivers two independent regulated outputs (e.g., 3.3V/2A and 1.2V/2A) and is used in XDSL modems, set-top boxes, and DSP power supplies.
For engineers reviewing the SC2620SETRT datasheet, pinout, applications, or equivalent options, key selection considerations include its SOIC-16 EDP thermally enhanced package, independent soft-start/shutdown pins, channel-specific power-good indicator, and dual 180° phase-shifted PWM regulation for compact, low-ripple POL designs.
Technical Context
The SC2620SETRT implements constant-frequency peak current-mode control with internal 6.3mΩ current-sense resistors and slope compensation, enabling fast transient response and simple Type-2 loop compensation. Each channel features independent error amplifiers (COMP1/COMP2), feedback inputs (FB1/FB2), and soft-start/enable pins (SS1/SS2).
It uses NPN power transistors driven by bootstrapped BOOST1/BOOST2 pins, requiring external diode-capacitor charge pumps to achieve full enhancement above VIN. The ROSC pin sets master oscillator frequency, with each channel operating at half that rate-enabling precise 500kHz–1.4MHz tuning per channel via a single resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 30V - supports wide industrial and CPE input rails including 9–16V DSL/Cable modem supplies. |
| Max Output Current per Channel | 2.3A continuous - enables dual 2A POL rails without external MOSFETs or heatsinking in SOIC-16. |
| Switching Frequency Range | Programmable up to 1.4MHz per channel - allows use of small 6.8–10µH ferrite inductors and ceramic capacitors for high-density layouts. |
| Feedback Reference Voltage | 1.000V ±20mV - enables accurate output setting (e.g., 1.2V, 3.3V) with standard 1% resistor dividers. |
| Thermal Resistance θJA | 31°C/W - validated in SOIC-16 EDP with exposed ground pad soldered to PCB plane, supporting 105°C ambient operation. |
| Channel Phase Relationship | 180° out-of-phase switching - cuts input RMS ripple current by ~70% vs. in-phase dual buck, reducing required input capacitance. |
| Protection Features | Cycle-by-cycle current limiting (3.2A typ), hiccup-mode overload shutdown, thermal shutdown (155°C), and UVLO (2.62V start). |
Pinout & Package
SC2620SETRT is housed in a thermally enhanced SOIC-16 EDP (Exposed Die Pad) package with lead-free finish and RoHS/WEEE compliance. The underside metal pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1, FB2 (Pins 1, 8) | Inverting inputs of error amplifiers | Connect to resistor dividers to set output voltage; bias current ≤30nA minimizes divider error. |
| BOOST1, BOOST2 (Pins 2, 7) | Bootstrap supply for NPN base drive | Requires external diode + capacitor to generate >VIN drive voltage; minimum VBST–VSW = 1.8V @ 25°C. |
| SW1, SW2 (Pins 3, 6) | Emitters of internal NPN power switches | Connect to inductor, freewheeling diode, and bootstrap cap; handles peak currents up to 3.2A. |
| PVIN1, PVIN2 (Pins 4, 5) | Collectors of internal NPN switches & current-sense supplies | Must be joined externally on PCB and bypassed close to GND; not internally connected. |
| COMP1, COMP2 (Pins 9, 16) | Error amplifier outputs | Drive RC compensation networks; pulling below 0.7V disables corresponding channel. |
| SS1, SS2 (Pins 10, 14) | Soft-start / enable / hiccup control | Capacitor-to-ground sets ramp time; <0.8V disables channel; <0.2V forces full shutdown (60µA IQ). |
| GND (Pin 11) | Analog ground reference | Single-point connection to PCB power ground plane; ties to exposed pad. |
| VIN (Pin 12) | Analog control supply | Powered from PVIN via optional RC filter; supplies bias circuits and references. |
| ROSC (Pin 13) | Frequency programming input | Resistor to GND sets master oscillator; channel freq = ½ ROSC freq (e.g., 46.4kΩ → 550kHz). |
| PGOOD1 (Pin 15) | Channel 1 power-good open-collector output | Active-low when FB1 reaches 90% of target; enables sequencing with downstream regulators or microcontrollers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current-mode regulators | Enables simultaneous, isolated 1.2V/2A and 3.3V/2A rails with separate soft-start, shutdown, and fault management. |
| 180° out-of-phase switching | Reduces input capacitor RMS ripple by ~70%, allowing smaller 4.7–10µF ceramic input caps instead of bulk electrolytics. |
| Integrated 2.3A/30V NPN switches | Eliminates external power devices and gate drivers; simplifies BOM and layout while maintaining 85–90% efficiency at full load. |
| Independent hiccup-mode overload protection | Each channel auto-restarts after overload clears-prevents thermal runaway during sustained short-circuit or overcurrent events. |
| Thermally enhanced SOIC-16 EDP | Exposed ground pad lowers θJC to 3.9°C/W, enabling 2A/channel operation at 105°C ambient without forced air. |
Applications
| XDSL/Cable Modem Power | Set-Top Box SoC Rails |
|---|---|
|
Use Scenario: Dual-rail power for ADSL2+ line card ICs and QAM demodulators requiring stable 3.3V I/O and 1.2V core supplies from 12V input. IC Role / Device Role / Timing Role: Primary POL regulator delivering tightly regulated, low-noise, sequenced outputs with PGOOD1 enabling safe SoC boot. Use Value: Out-of-phase operation reduces input ripple, easing EMI filtering; integrated switches eliminate discrete FETs and drivers, shrinking board area by >30%. |
Use Scenario: Powering ARM-based media processors and DDR memory interfaces in consumer STBs with 9–16V wall adapters. IC Role / Device Role / Timing Role: Dual synchronous buck controller managing independent 1.1V CPU and 1.8V memory rails with soft-start coordination. Use Value: Independent SS1/SS2 pins allow staggered startup to prevent inrush current overload; hiccup protection sustains operation during transient HDMI hot-plug events. |
| DSP Signal Processing Systems | CPE Equipment Power |
|
Use Scenario: Generating clean 1.2V/2A and 3.3V/2A supplies for multi-core DSPs in VoIP gateways and baseband processing units. IC Role / Device Role / Timing Role: High-frequency (1.4MHz) dual regulator minimizing inductor size while maintaining tight load regulation under dynamic DSP workloads. Use Value: Current-mode control delivers <50µs transient response to 80% load steps; COMP pins support custom loop tuning for jitter-sensitive audio codecs. |
Use Scenario: Compact, reliable DC-DC conversion in outdoor-rated customer premises equipment (e.g., fiber ONTs, wireless access points) operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Robust dual buck IC with thermal shutdown (155°C), wide VIN (2.8–30V), and RoHS-compliant packaging for long-life deployments. Use Value: SOIC-16 EDP package with soldered exposed pad ensures thermal reliability at full load in sealed enclosures; UVLO hysteresis prevents brownout oscillation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54290RGTR | 2.5A/channel, 32V max, fixed 300kHz/600kHz dual frequency; no ROSC programming; uses external MOSFETs. | Requires external high-side FETs and drivers; larger solution size but higher efficiency at light loads due to Eco-mode. | Choose TPS54290RGTR when efficiency at <10% load matters more than board space or BOM count. |
| MP2491DS-LF-Z | 2A/channel, 36V max, 100kHz–2.2MHz programmable via resistor; integrated MOSFETs; no PGOOD or hiccup mode. | Lacks channel-specific power-good and hiccup protection; single SS pin limits independent sequencing. | Choose MP2491DS-LF-Z when cost sensitivity outweighs need for robust fault handling and rail sequencing. |
Compared with TPS54290RGTR and MP2491DS-LF-Z, the SC2620SETRT uniquely combines programmable high-frequency operation (up to 1.4MHz), integrated NPN switches, independent hiccup protection per channel, and a dedicated PGOOD1 signal-making it optimal for space-constrained, reliability-critical CPE and broadband infrastructure designs.
Availability
SC2620SETRT is available at Aetrix Electronics and suitable for XDSL modems, set-top boxes, and DSP power supplies requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.
Supply support for SC2620SETRT 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
Semtech Corporation is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power management, protection, and signal integrity.
The SC2620SETRT belongs to Semtech's SC26xx family of dual-channel DC-DC regulators designed specifically for high-density, high-reliability power delivery in broadband communications and consumer electronics infrastructure.
FAQ
What is the maximum supported switching frequency for each channel of the SC2620SETRT?
The SC2620SETRT supports a programmable channel switching frequency up to 1.4MHz, set via an external resistor from the ROSC pin to ground. This frequency corresponds to half the master oscillator frequency, and operation at 1.4MHz enables use of compact 6.8µH inductors and ceramic output capacitors. The SC2620SETRT datasheet confirms this limit under "Electrical Characteristics" with typical values of 1.2–1.4MHz and a maximum of 1.6MHz under specific conditions.
Does the SC2620SETRT support independent power sequencing between its two output channels?
Yes, the SC2620SETRT supports independent sequencing via dedicated SS1 and SS2 pins. Pulling SS2 high only after PGOOD1 asserts enables strict startup ordering-for example, powering a 3.3V I/O rail before a 1.2V core rail. The SC2620SETRT block diagram and "Operation" section confirm that each channel's soft-start ramp and enable logic operate independently, with no shared timing constraints.
What thermal performance can be expected from the SC2620SETRT in its SOIC-16 EDP package?
The SC2620SETRT achieves a junction-to-ambient thermal resistance (θJA) of 31°C/W when the exposed pad is properly soldered to a 4-layer PCB ground plane. Its junction-to-case (θJC) is 3.9°C/W, and thermal shutdown activates at 155°C with 10°C hysteresis. These values are measured and specified in the "Absolute Maximum Ratings" and "Typical Characteristics" sections of the official SC2620SETRT datasheet.
Can the SC2620SETRT operate with a single input supply feeding both channels simultaneously?
Yes, the SC2620SETRT is explicitly designed for common-input operation: both channels share the same VIN and PVIN connections, and the internal architecture uses a shared voltage reference and master oscillator. The "Operation" section states that "both regulators… operate from a common input power supply," and Figure 1(a) shows a single 9–16V input powering both 3.3V and 1.2V outputs.
Is the SC2620SETRT RoHS and WEEE compliant?
Yes, the SC2620SETRT is fully RoHS and WEEE compliant, as confirmed in the "Ordering Information" section of its datasheet, which states: "(2) Lead free product. This product is fully WEEE and RoHS compliant." The "Features" list also explicitly cites "Fully WEEE and RoHS Compliant" as a key attribute of the SC2620SETRT.
SC2620SETRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 27V
- Current - Output:
- 2.3A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SC2620SETRT FAQ
1.How can I place an order for SC2620SETRT through Aetrix?
Please submit a Request for Quotation (RFQ) for SC2620SETRT 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 SC2620SETRT reliable?
The price and inventory of SC2620SETRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC2620SETRT is usually 5 days.
3.What payment methods are accepted for SC2620SETRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC2620SETRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC2620SETRT?
SC2620SETRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC2620SETRT 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 SC2620SETRT?
For technical support, including SC2620SETRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC2620SETRT requirements.
6.How does Aetrix verify that SC2620SETRT is sourced from the original manufacturer or authorized distributors?
All SC2620SETRT 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 SC2620SETRT meets industry standards.
7.What is the process for return or replacement of SC2620SETRT?
All SC2620SETRT units undergo pre-shipment inspection (PSI). If there is an issue with SC2620SETRT, 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 SC2620SETRT part is unused and in its original packaging.
Return procedure for SC2620SETRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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