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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Semtech Corporation SC4510

Name: SC4510
Brand: Semtech Corporation
SKU: SC4510
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SC4510

Manufacturer:: Semtech Corporation

Category:: DC DC Switching Controllers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: SC4510.pdf

Description:: IC REG CTRLR BUCK 20TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SC4510 from Semtech is a high-performance synchronous buck controller with reference tracking, peak current mode control, Combi-Sense™ lossless current sensing, and dual-source/sink capability for DDR memory terminators and point-of-use DC-DC supplies. It operates from 2.5V to 16V input, supports 100 kHz–1 MHz programmable switching frequency, and integrates high-side (0.75 A) and low-side (1 A) N-MOSFET gate drivers in TSSOP-20.

For engineers reviewing the SC4510 datasheet, pinout, applications, or equivalent options, key selection considerations include its buffered REFOUT tracking accuracy (±10 mV or ±0.5%), internal 0.5 V reference stability over temperature (±1 mV), Combi-Sense current limit thresholds (±60–130 mV), programmable oscillator via ROSC resistor, and integrated PGOOD monitoring referenced to REFIN.

Technical Context

The SC4510 implements peak current mode control with transconductance error amplifier (GM = 275 µΩ⁻¹), built-in slope compensation optimized per duty cycle, and Combi-Sense™ architecture that combines MOSFET R_DS(on) and inductor DCR for lossless current sensing. Its error amplifier accepts either internal 0.5 V reference or external voltage (0.3–3.0 V) at REFIN, with REFOUT buffering that tracks REFIN within ±10 mV or ±0.5%.

Gate drive logic includes 90 ns typical dead time, 20 ns rise/fall times (C_OUT = 1000 pF), and bootstrap-based high-side drive via BST pin. The controller supports external synchronization (TTL-compatible SYNC input), soft-start/enable (SS/EN with 0.5 V start threshold), and hiccup-mode overcurrent protection triggered by IN- falling below 70% of REFIN.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	VIN = 2.5–16 V; enables use with 3.3 V, 5 V, and 12 V rails without intermediate regulation
Reference Voltage	Internal VREF = 0.49–0.51 V (–40°C to +85°C); ensures stable feedback across industrial temperature range
Switching Frequency	F_OSC = 100–1000 kHz, set by ROSC resistor; allows optimization of efficiency vs. size (e.g., 300 kHz → 90% max duty cycle)
Current Sense Threshold	V_CSLIM = +60 to +90 mV (source), –85 to –130 mV (sink); enables precise cycle-by-cycle current limiting for bidirectional load current
Gate Drive Capability	GDH peak = ±0.75 A, GDL peak = ±1 A; drives large N-MOSFETs directly without external drivers
Power Good Accuracy	PGOOD monitors IN- with ±12% window around REFIN; provides reliable output voltage validation for DDR termination
Operating Temperature	Junction range –40°C to +125°C; qualified for industrial embedded power applications

Pinout & Package

TSSOP-20 package with exposed thermal pad (JEDEC MO-153 AC variation); 0.65 mm pitch, 4.4 × 6.5 mm body, suitable for high-density PCB layouts with thermal management via PGND-connected pad.

Pin/Terminal	Circuit Role	Design Meaning
1 (REF)	Internal bandgap reference output	Provides stable 0.5 V reference; used as non-inverting input when shorted to REFIN for fixed-output operation
2 (REFIN)	Error amplifier non-inverting input	Accepts internal REF or external tracking voltage (0.3–3.0 V); sets regulation point and PGOOD thresholds
3 (REFOUT)	Buffered reference output	Tracks REFIN within ±10 mV or ±0.5%; sources up to 5 mA for DDR VTT termination or auxiliary bias
4 (CS+), 5 (CS–)	Differential current sense inputs	Interface with Combi-Sense network; detect inductor current via weighted MOSFET R_DS(on) + DCR sensing
9 (GDL), 11 (GDH)	Low-side / high-side gate drivers	Drive N-MOSFET gates directly; GDH uses bootstrap (BST pin) for high-side floating supply
12 (BST)	Bootstrap capacitor connection	Connects external capacitor/diode to generate gate drive voltage > VIN for high-side MOSFET
13 (VPN)	Virtual phase node	RC network input for Combi-Sense; enables lossless current sensing without shunt resistor
15 (SS/EN)	Soft-start and enable input	TTL-compatible (0.6 V shutdown, 0.5 V start); controls ramp-up time and system-level enable sequencing
16 (ROSC)	Oscillator frequency programming	Resistor-to-ground sets F_OSC = 66 kΩ / ROSC (kΩ); enables precise frequency tuning and EMI control
20 (AGND)	Analog ground reference	Separate return for noise-sensitive circuits (COMP, ROSC, feedback, sync); prevents switching noise coupling into error amp

Key Features

Feature	Design Value
Synchronous buck controller with source/sink capability	Regulates bidirectional load current (e.g., DDR memory termination), eliminating need for separate sink circuitry
Combi-Sense™ lossless current sensing	Replaces power-wasting shunt resistors; uses MOSFET R_DS(on) and inductor DCR to achieve >95% efficiency at full load
Buffered REFOUT with tracking accuracy	Delivers REFIN-referenced voltage to external circuitry with ±10 mV offset-critical for matched DDR VTT/VREF generation
Programmable oscillator with external sync	ROSC resistor sets frequency from 100 kHz–1 MHz; SYNC input allows multi-rail systems to avoid beat frequencies
Integrated PGOOD with REFIN-referenced thresholds	Monitors output at ±12% of REFIN (not fixed % of VOUT); maintains accuracy even when REFIN drifts or is externally varied

Applications

DDR Memory Termination	Point-of-Use DC-DC Converter
Use Scenario: Providing matched VTT termination voltage for DDR2/DDR3 memory buses requiring bidirectional current sourcing and sinking. IC Role / Device Role / Timing Role: Synchronous buck controller regulating VTT to half the memory VDDQ rail, with REFOUT delivering buffered VREF to memory controller. Use Value: Eliminates discrete sink FETs and shunt resistors; achieves <1% tracking error between VTT and VREF using internal reference and buffered REFOUT.	Use Scenario: Generating stable 1.2 V or 1.5 V core voltage for FPGA, ASIC, or microprocessor from 5 V or 12 V intermediate bus. IC Role / Device Role / Timing Role: Primary voltage regulator with fast transient response, programmable frequency, and integrated gate drivers reducing BOM count. Use Value: Delivers >90% efficiency at 10 A load using Combi-Sense current sensing and 0.75 A/1 A gate drivers-no external driver IC required.
Externally Referenced Buck Converter	Industrial Tracking Power Supply
Use Scenario: Regulating output to track an analog sensor output or DAC voltage in precision instrumentation. IC Role / Device Role / Timing Role: Tracking buck controller accepting variable REFIN (0.3–3.0 V); REFOUT provides isolated copy for feedback isolation or calibration. Use Value: Maintains ±0.5% tracking accuracy over temperature and line variations-enables closed-loop analog control without op-amp compensation.	Use Scenario: Powering analog front-ends in PLC modules where output must track a master reference under varying load and temperature. IC Role / Device Role / Timing Role: High-stability buck controller with 0.5 V internal reference (±1 mV over –40°C to +85°C) and low-drift error amplifier (2.5 mV offset). Use Value: Ensures <±2 mV total output variation across full operating range-meets industrial-grade precision requirements without post-regulation.

DDR Memory Termination

Point-of-Use DC-DC Converter

Use Scenario: Providing matched VTT termination voltage for DDR2/DDR3 memory buses requiring bidirectional current sourcing and sinking.

IC Role / Device Role / Timing Role: Synchronous buck controller regulating VTT to half the memory VDDQ rail, with REFOUT delivering buffered VREF to memory controller.

Use Value: Eliminates discrete sink FETs and shunt resistors; achieves <1% tracking error between VTT and VREF using internal reference and buffered REFOUT.

Use Scenario: Generating stable 1.2 V or 1.5 V core voltage for FPGA, ASIC, or microprocessor from 5 V or 12 V intermediate bus.

IC Role / Device Role / Timing Role: Primary voltage regulator with fast transient response, programmable frequency, and integrated gate drivers reducing BOM count.

Use Value: Delivers >90% efficiency at 10 A load using Combi-Sense current sensing and 0.75 A/1 A gate drivers-no external driver IC required.

Externally Referenced Buck Converter

Industrial Tracking Power Supply

Use Scenario: Regulating output to track an analog sensor output or DAC voltage in precision instrumentation.

IC Role / Device Role / Timing Role: Tracking buck controller accepting variable REFIN (0.3–3.0 V); REFOUT provides isolated copy for feedback isolation or calibration.

Use Value: Maintains ±0.5% tracking accuracy over temperature and line variations-enables closed-loop analog control without op-amp compensation.

Use Scenario: Powering analog front-ends in PLC modules where output must track a master reference under varying load and temperature.

IC Role / Device Role / Timing Role: High-stability buck controller with 0.5 V internal reference (±1 mV over –40°C to +85°C) and low-drift error amplifier (2.5 mV offset).

Use Value: Ensures <±2 mV total output variation across full operating range-meets industrial-grade precision requirements without post-regulation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS54620	Fixed 0.6 V reference; no buffered REFOUT or external REFIN tracking; uses resistor-based current sense	Designed for standard fixed-output point-of-load; lacks DDR-specific tracking and sink capability	Choose for cost-sensitive fixed-VOUT designs where REFIN tracking and bidirectional current are unnecessary
ISL6269	Supports DDR3 VTT with dedicated sink/source outputs; no Combi-Sense-requires external current sense resistor	Optimized for DDR3 memory power with integrated VTT/VREF generators; higher pin count (QFN-32)	Prefer for DDR3-specific implementations needing guaranteed sink current compliance but willing to accept shunt losses

Compared with TPS54620 and ISL6269, the SC4510 uniquely combines external reference tracking, lossless Combi-Sense current sensing, and true bidirectional regulation in a compact TSSOP-20-making it optimal for DDR2/DDR3 termination and precision tracking supplies where efficiency and layout simplicity are critical.

Availability

SC4510 is available at Aetrix Electronics and suitable for DDR memory terminators, point-of-use DC-DC converters, and externally referenced buck converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SC4510 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 high-performance analog and mixed-signal ICs for power management, RF, and sensing applications.

The SC4510 belongs to Semtech's Power Management product line, designed specifically for high-efficiency, high-accuracy DC-DC conversion in memory interface and industrial embedded systems requiring reference tracking and lossless current sensing.

FAQ

What is the primary function of the SC4510 in a power supply design?

The SC4510 is a synchronous buck controller that regulates output voltage using peak current mode control. Its primary function is to drive external N-channel MOSFETs while supporting bidirectional current flow (source and sink), reference tracking, and lossless current sensing via Combi-Sense™. In SC4510-based designs, it replaces traditional controllers requiring external current sense resistors or discrete sink circuitry-especially valuable in DDR memory termination applications where SC4510 delivers matched VTT and VREF with minimal component count.

How does the SC4510 implement lossless current sensing?

The SC4510 implements lossless current sensing using Semtech's patented Combi-Sense™ technique, which combines the voltage drops across the high-side and low-side MOSFET R_DS(on) and the output inductor's DCR. It uses differential inputs CS+ and CS– along with the VPN pin and an external RC network to reconstruct inductor current without a power-dissipating shunt resistor. This method reduces conduction losses, improves thermal performance, and increases overall converter efficiency-key advantages realized in every SC4510 application where high current and low voltage dropout matter.

Can the SC4510 be used for DDR memory termination, and what makes it suitable?

Yes, the SC4510 is explicitly designed for DDR memory termination. It supports bidirectional current sourcing and sinking, tracks an external reference (e.g., VDDQ/2) at REFIN, and provides a buffered REFOUT that replicates REFIN with ±10 mV or ±0.5% accuracy-ensuring tight matching between VTT and VREF. Its PGOOD circuit monitors output relative to REFIN (±12%), not absolute voltage, preserving accuracy during reference drift. These features make SC4510 ideal for DDR2/DDR3 termination where SC4510 eliminates discrete sink FETs and shunts while maintaining JEDEC compliance.

What are the voltage limits and operating ranges for AVCC, PVCC, and VIN on the SC4510?

The SC4510 specifies AVCC and PVCC operating ranges of 4.75 V to 16 V, with undervoltage lockout (UVLO) activating below 4.2 V (typical 4.5 V start). VIN operates from 2.5 V to 16 V. Absolute maximum ratings allow BST and GDH to PGND up to 32 V steady-state (40 V transient <10 ns), and all other supplies to PGND up to 16 V. These ranges enable SC4510 to operate directly from common intermediate rails (5 V, 12 V) while maintaining robust startup behavior and fault tolerance-critical for reliable SC4510 deployment in industrial and computing power systems.

How is the switching frequency programmed on the SC4510, and what is its range?

The SC4510 switching frequency is programmed using an external resistor (ROSC) connected from pin 16 to AGND, following the formula ROSC (kΩ) = 66 / F_OSC (MHz). It supports 100 kHz to 1 MHz, with typical values like 221 kΩ yielding 300 kHz. The controller also accepts external TTL-compatible synchronization via the SYNC pin (pins 5 and 6 thresholds: >1.5 V high, <0.5 V low). This programmability allows designers to optimize SC4510-based converters for efficiency, size, and EMI-making frequency selection a key part of SC4510 system tuning.

SC4510 Specifications

Product attributes: Attribute value

Manufacturer:: Semtech Corporation

Series:: -

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Obsolete

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 4.75V ~ 16V

Frequency - Switching:: 100kHz ~ 1MHz

Duty Cycle (Max):: 90%

Synchronous Rectifier:: Yes

Clock Sync:: Yes

Serial Interfaces:: -

Control Features:: Enable, Frequency Control, Power Good, Soft Start

Operating Temperature:: -40°C ~ 85°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

SC4510 FAQ

1.How can I place an order for SC4510 through Aetrix?

Please submit a Request for Quotation (RFQ) for SC4510 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 SC4510 reliable?

The price and inventory of SC4510 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC4510 is usually 5 days.

3.What payment methods are accepted for SC4510?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC4510 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SC4510?

SC4510 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SC4510 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 SC4510?

For technical support, including SC4510 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC4510 requirements.

6.How does Aetrix verify that SC4510 is sourced from the original manufacturer or authorized distributors?

All SC4510 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 SC4510 meets industry standards.

7.What is the process for return or replacement of SC4510?

All SC4510 units undergo pre-shipment inspection (PSI). If there is an issue with SC4510, 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 SC4510 part is unused and in its original packaging.

Return procedure for SC4510:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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