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Analog Devices Inc. LT3510EFE#PBF
- Part No.:
- LT3510EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3510EFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A DL 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:396
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Product details
Overview
LT3510EFE#PBF from Analog Devices (formerly Linear Technology) is a monolithic dual current-mode PWM step-down DC/DC converter with two internal 2.5A NPN switches, designed for independent or tracked 2A output regulation. It supports wide input range (3.1V–25V), 250kHz–1.5MHz programmable/synchronizable switching frequency, and 180° antiphase operation to reduce input ripple. Used in DSP power supplies, disc drives, and PCI cards requiring tight output tracking.
For engineers reviewing the LT3510EFE#PBF datasheet, LT3510EFE#PBF pinout, LT3510EFE#PBF application, or LT3510EFE#PBF equivalent, key selection criteria include independent soft-start/PG pins per channel, 95% max duty cycle for low-dropout operation, ±16mV feedback offset between channels, and exposed-pad 20-lead TSSOP thermal performance.
Technical Context
The LT3510EFE#PBF implements dual independent current-mode control loops with transconductance error amplifiers (275μmho typ), cycle-by-cycle peak current limiting, and slope compensation. Each channel features dedicated VC, FB, SS/TRACK, and PG pins enabling ratiometric, sequential, or absolute output tracking without external circuitry.
It uses an internal oscillator with resistor-programmable or externally synchronized clock input (250kHz–1500kHz), maintaining precise 180° phase shift between channels across all frequencies. The BST1/BST2 pins drive external bootstrap capacitors to sustain high-side NPN saturation, enabling ~95% maximum duty cycle during dropout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 25V - supports wide industrial and adapter-fed inputs without pre-regulation |
| Output Current per Channel | 2A continuous - sufficient for core logic rails like 3.3V/1.8V DSP or FPGA I/O supplies |
| Switching Frequency Range | 250kHz to 1.5MHz - adjustable via RT/SYNC resistor or external clock for EMI control and size optimization |
| Feedback Reference Voltage | 0.800V ±16mV - enables accurate output setting with standard resistor dividers; matched between channels |
| Max Duty Cycle | ~95% - allows operation with VIN as low as VOUT + VSW + VD, critical for high-VOUT/low-VIN scenarios |
| Shutdown Quiescent Current | 9μA (Ch1), <1μA (Ch2) - ensures ultra-low standby power in battery-backed or always-on systems |
| Thermal Performance | θJC(PAD) = 10°C/W - exposed pad soldered to PCB plane delivers robust thermal management at full load |
Pinout & Package
LT3510EFE#PBF is housed in a 20-lead plastic TSSOP package with exposed leadframe (Pin 21 = GND), optimized for low thermal resistance (θJA = 45°C/W, θJC = 10°C/W). The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (1) | Main supply input & control bias source | Powers internal regulators and channel 1 switch collector; requires local high-dI/dt decoupling |
| SW1 (2) | Channel 1 switch emitter | Connects to inductor and Schottky catch diode cathode; swings below ground during off-time |
| IND1 (3) | Inductor current sense input | Feeds internal current-sense amplifier; bias current flows out when voltage <1.6V |
| VOUT1 (4) | Channel 1 output sense return | Completes current-sense path; bias current flows out when voltage <1.6V |
| PG1 (5) | Channel 1 power-good open-collector output | Sinks current when FB1 falls below 90% of 0.8V; hysteresis = 30mV |
| PG2 (6) | Channel 2 power-good open-collector output | Independent PG signal; can be tied together or left floating |
| VOUT2 (7) | Channel 2 output sense return | Matches VOUT1 function for second regulator |
| IND2 (8) | Inductor current sense input | Matches IND1 function for second regulator |
| SW2 (9) | Channel 2 switch emitter | Matches SW1 function; 180° antiphase with SW1 |
| VIN2 (10) | Channel 2 switch collector supply | Independent of VIN1; may share or separate input rail; requires local decoupling |
| BST1 (20) | Channel 1 bootstrap drive | Supplies >VIN base drive to NPN; comparator enforces minimum off-time if voltage drops too low |
| SS/TRACK1 (19) | Channel 1 soft-start & tracking control | 3.25μA constant-current source; sets ramp rate and enables tracking with SS2 |
| VC1 (18) | Channel 1 error amplifier output | Drives peak current comparator; used for loop compensation or current clamping |
| FB1 (17) | Channel 1 feedback input | Regulated to 0.8V; bias current flows out; connects to resistor divider from VOUT1 |
| RT/SYNC (16) | Frequency set / synchronization input | 0.975V reference; resistor sets frequency (250kHz–1.5MHz); rising edge syncs both channels |
| SHDN (15) | Global shutdown control | 1.28V threshold; pulls both channels into 9μA shutdown mode when low |
| FB2 (14) | Channel 2 feedback input | Matches FB1 function; ±16mV offset vs FB1 confirmed over temperature |
| VC2 (13) | Channel 2 error amplifier output | Matches VC1 function; identical gm and gain specs |
| SS/TRACK2 (12) | Channel 2 soft-start & tracking control | Matches SS/TRACK1; enables independent or ratio-matched sequencing |
| BST2 (11) | Channel 2 bootstrap drive | Matches BST1 function; independent capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Independent channel control | Separate VIN, FB, SS/TRACK, PG, and VC pins per channel enable fully autonomous regulation or precise tracking |
| Antiphase switching | 180° phase shift reduces input capacitor RMS current by up to 30%, allowing smaller bulk capacitance |
| Programmable frequency | 250kHz–1.5MHz adjustment via single RT/SYNC resistor supports EMI compliance and layout optimization |
| Enhanced dropout operation | ~95% max duty cycle extends usable input range down to VOUT + 0.4V (switch drop) + 0.6V (diode drop) |
| Robust protection suite | Includes undervoltage lockout on VIN1, thermal shutdown, short-circuit current limiting, and power-good monitoring |
Applications
| DSP Power Supplies | Disc Drives |
|---|---|
Use Scenario: Dual-rail power for digital signal processors requiring tightly tracked 3.3V core and 1.8V I/O supplies with controlled startup sequencing. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing independent 2A outputs with ratiometric tracking and antiphase switching. Use Value: Eliminates need for external tracking circuits; 180° phase reduces input ripple amplitude by 50%, lowering bulk capacitor requirements. | Use Scenario: Compact, efficient power for spindle motor drivers and servo controllers in 2.5" and 3.5" HDDs with variable input from USB or wall adapters. IC Role / Device Role / Timing Role: Dual-channel step-down converter delivering regulated 5V and 3.3V rails from 12V or 19V inputs with independent soft-start. Use Value: 95% max duty cycle maintains regulation even as input sags under load; exposed-pad TSSOP sustains 2A/channel at 70°C ambient. |
| DSL/Cable Modems | PCI Cards |
Use Scenario: Multi-rail power for integrated PHY, MAC, and memory interfaces in broadband access equipment operating from 12V or 24V telecom supplies. IC Role / Device Role / Timing Role: Dual buck controller generating isolated 3.3V and 1.2V outputs with independent power-good signaling for system reset coordination. Use Value: Independent PG1/PG2 pins allow staggered power-up of subsystems; 250kHz–1.5MHz sync capability avoids noise coupling into sensitive analog front-ends. | Use Scenario: Board-level power for add-in cards requiring stable 5V and 3.3V rails from PCIe slot or auxiliary 12V connector, with thermal margin for convection cooling. IC Role / Device Role / Timing Role: Monolithic dual regulator with exposed thermal pad handling 2A/channel in space-constrained TSSOP footprint. Use Value: θJC = 10°C/W enables full 4A combined output at ≤125°C junction temp without heatsink; pin-compatible upgrade path from older dual-buck ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | Single-channel 3A buck; no dual output or tracking; 4V–15V input; 3mm × 4mm MSOP | Requires two devices for dual-rail; lacks antiphase ripple reduction and independent PG/SS | Choose when higher per-channel current (>2A) or smaller footprint is prioritized over dual integration |
| TPS54290PWPR | Dual 2A buck; 4.5V–18V input; 300kHz–2MHz sync; no exposed thermal pad; 20-pin HTSSOP | Higher min input (4.5V); lower thermal performance (θJA = 52°C/W); no 95% dropout mode | Choose for higher-frequency designs where efficiency above 500kHz matters more than ultra-low-VIN operation |
Compared with LTC3631EMSE#PBF and TPS54290PWPR, the LT3510EFE#PBF uniquely integrates dual 2A channels with true antiphase operation, 3.1V minimum input, 95% duty cycle, and exposed-pad thermal design-making it optimal for space- and thermal-constrained dual-rail systems requiring tracking and low dropout.
Availability
LT3510EFE#PBF is available at Aetrix Electronics and suitable for DSP power supplies, disc drives, and PCI cards requiring stable component supply, long-term industrial temperature support (–40°C to 125°C), and lead-free RoHS-compliant packaging.
Supply support for LT3510EFE#PBF 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
Analog Devices acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification.
The LT3510EFE#PBF belongs to Linear's monolithic DC/DC converter family, engineered for compact, high-efficiency multi-rail power in space-constrained embedded systems requiring precision tracking and thermal resilience.
FAQ
What is the guaranteed operating temperature range for the LT3510EFE#PBF?
The LT3510EFE#PBF is specified for operation from –40°C to 125°C junction temperature. While performance parameters like feedback voltage (0.784V–0.816V) and shutdown threshold (1.23V–1.37V) are guaranteed over this full range, certain specifications (e.g., quiescent current, switching frequency accuracy) are characterized at 25°C unless marked with "l" in the datasheet. The E-grade part is intended for industrial applications where extended thermal margin is required.
Can the LT3510EFE#PBF operate with input voltage below 3.1V?
The LT3510EFE#PBF has a minimum functional input voltage of ~2.8V (per Absolute Maximum Ratings table), but stable regulation requires higher headroom. At light loads and low output voltages, it can maintain regulation down to VIN ≈ VOUT + 0.4V (switch drop) + 0.6V (diode drop) due to its ~95% max duty cycle. However, below 3.1V, internal bias generation becomes marginal - the datasheet specifies 3.1V as the practical minimum for guaranteed full-feature operation across temperature.
How does the LT3510EFE#PBF achieve antiphase switching between channels?
The LT3510EFE#PBF uses an internal oscillator that generates two clock signals precisely 180° out of phase, regardless of whether frequency is set by the RT/SYNC resistor or an external synchronization signal. This architecture ensures consistent antiphase operation across the full 250kHz–1.5MHz range, reducing input capacitor RMS current and enabling smaller, lower-cost bulk capacitance compared to in-phase dual converters.
What is the purpose of the exposed pad (Pin 21) on the LT3510EFE#PBF?
The exposed pad (Pin 21) on the LT3510EFE#PBF is the device's sole ground connection - electrically and thermally. It serves as the common ground for both channels, small-signal references, and power return paths. To achieve the specified θJC = 10°C/W, the pad must be soldered to a large PCB copper area. Improper grounding (e.g., floating or undersized pad) degrades thermal performance and may cause instability or premature thermal shutdown.
Does the LT3510EFE#PBF support output voltage tracking, and how is it implemented?
Yes, the LT3510EFE#PBF supports multiple tracking modes - ratiometric, sequential, or absolute - using the SS/TRACK1 and SS/TRACK2 pins. Connecting these pins together with appropriate RC networks configures ratiometric startup (e.g., 1.8V follows 3.3V at fixed ratio). Driving one SS pin with a voltage ramp enables sequential turn-on. The internal 3.25μA soft-start current source and matching error amplifier offsets (±16mV) ensure accurate, repeatable tracking without external op-amps or comparators.
LT3510EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 23.75V
- Current - Output:
- 2A
- Frequency - Switching:
- 250kHz ~ 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT3510EFE#PBF FAQ
1.How can I place an order for LT3510EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3510EFE#PBF 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 LT3510EFE#PBF reliable?
The price and inventory of LT3510EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3510EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3510EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3510EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3510EFE#PBF?
LT3510EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3510EFE#PBF 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 LT3510EFE#PBF?
For technical support, including LT3510EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3510EFE#PBF requirements.
6.How does Aetrix verify that LT3510EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3510EFE#PBF 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 LT3510EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3510EFE#PBF?
All LT3510EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3510EFE#PBF, 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 LT3510EFE#PBF part is unused and in its original packaging.
Return procedure for LT3510EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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