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Analog Devices Inc. LT3510IFE
- Part No.:
- LT3510IFE
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3510IFE.pdf
- Description:
- IC REG BUCK ADJ 2A DL 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,660
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Product details
Overview
LT3510IFE 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, operating over –40°C to 125°C. It delivers independent 2A outputs at 3.3V and 1.8V with tracking capability, 250kHz–1.5MHz programmable switching frequency, and 95% maximum duty cycle for wide-input dropout operation - used in DSP power supplies, PCI cards, and DSL/cable modems.
For engineers reviewing the LT3510IFE datasheet, LT3510IFE pinout, LT3510IFE application, or LT3510IFE equivalent, key selection considerations include antiphase channel synchronization, independent soft-start and power-good signaling per channel, exposed-pad TSSOP thermal performance, and verified operation across industrial temperature range without derating.
Technical Context
The LT3510IFE implements dual independent current-mode control loops with transconductance error amplifiers (275 μmho typical gm), 180° antiphase switching to reduce input ripple, and integrated slope compensation that auto-adjusts during external synchronization. Each channel features dedicated FB, VC, SS/TRACK, PG, and IND pins enabling precise output tracking, sequencing, and overload protection.
Its architecture supports three distinct operating modes: resistor-programmed fixed-frequency (250kHz–1.5MHz via RT/SYNC), external clock synchronization (250kHz–1.5MHz), and dropout-enhanced 100% duty cycle operation enabled by BST voltage monitoring and forced minimum off-time. The device uses internal 0.8V reference with ±16mV inter-channel feedback offset and 30mV PG hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A per channel (2.5A internal switch rating); supports parallel operation for higher current. |
| Input Voltage Range | 3.1V to 25V; minimum 2.8V startup threshold ensures reliable biasing under low-VIN conditions. |
| Switching Frequency | 250kHz to 1.5MHz (resistor- or sync-programmable); maintains 180° phase relationship across full range. |
| Feedback Reference | 0.8V ±2% (±16mV inter-channel match); enables accurate output regulation with standard resistor dividers. |
| Duty Cycle Limit | ~95% maximum; achieved via BST monitoring and forced off-time to sustain regulation near VIN ≈ VOUT. |
| Shutdown Current | <10μA total (9μA on VIN1, <1μA on VIN2); enables ultra-low-power system standby states. |
| Thermal Rating | –40°C to 125°C junction; validated across full range with θJC(PAD) = 10°C/W for PCB thermal design. |
Pinout & Package
The LT3510IFE is housed in a 20-lead TSSOP package with exposed leadframe (Pin 21 = GND), optimized for low thermal resistance (θJA = 45°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 both channels' control circuitry and serves as collector for Ch1 NPN switch; requires local high-dI/dt decoupling. |
| SW1 (2) | Ch1 power switch emitter | High dV/dt node requiring Schottky catch diode to GND; connects to inductor and output filter. |
| IND1 (3) | Ch1 inductor current sense input | Sense resistor input for current-mode control; bias current flows out when voltage <1.6V. |
| VOUT1 (4) | Ch1 output voltage sense return | Current-sense resistor output node; bias current flows out when voltage <1.6V. |
| PG1 (5) | Ch1 power-good open-collector output | Sinks current when FB1 falls below 90% of 0.8V; 30mV hysteresis prevents chatter during transients. |
| PG2 (6) | Ch2 power-good open-collector output | Independent PG signal; can be tied to PG1 for combined status or left floating. |
| VOUT2 (7) | Ch2 output voltage sense return | Matches VOUT1 function for second channel; supports independent or ratiometric tracking. |
| IND2 (8) | Ch2 inductor current sense input | Identical to IND1; enables per-channel current limiting and cycle-by-cycle protection. |
| SW2 (9) | Ch2 power switch emitter | 180° antiphase to SW1; reduces input capacitor RMS current and EMI. |
| VIN2 (10) | Ch2 collector supply input | Independent of VIN1; may share supply or use separate rail; requires local decoupling. |
| BST1 (20) | Ch1 bootstrap drive voltage | Provides >VIN base drive to Ch1 NPN; comparator forces minimum off-time if BST drops too low. |
| SS/TRACK1 (19) | Ch1 soft-start and tracking control | 3.25μA constant-current source sets ramp rate; enables absolute, ratiometric, or sequential tracking. |
| VC1 (18) | Ch1 error amplifier output & current clamp | Transconductance amplifier output (275 μmho); clamps at ~2.1V to limit max switch current. |
| FB1 (17) | Ch1 feedback input | Regulated to 0.8V ±2%; 75nA bias current allows use of ≤10kΩ divider resistors. |
| RT/SYNC (16) | Frequency programming & sync input | Internally regulated at 0.975V; resistor sets frequency, external clock synchronizes both channels. |
| SHDN (15) | Global shutdown control | 1.28V threshold with hysteresis; pulls both channels into <10μA shutdown state. |
| FB2 (14) | Ch2 feedback input | Identical to FB1; supports independent regulation or tracking via SS2 coupling. |
| VC2 (13) | Ch2 error amplifier output & current clamp | Matches VC1; enables per-channel loop compensation and current limiting. |
| SS/TRACK2 (12) | Ch2 soft-start and tracking control | Independent ramp control; allows asymmetric sequencing (e.g., 3.3V before 1.8V). |
| BST2 (11) | Ch2 bootstrap drive voltage | Functions identically to BST1; requires dedicated boost capacitor per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase channel switching | 180° phase shift reduces input capacitor RMS current by ~30% and eases EMI filtering. |
| Independent tracking/sequencing | Separate SS/TRACK pins enable absolute, ratiometric, sequential, or independent output ramp control. |
| Enhanced dropout operation | ~95% max duty cycle via BST monitoring allows regulation with VIN as low as VOUT + 0.3V. |
| Robust short-circuit protection | Current-mode control with per-channel IND sensing provides immediate cycle-by-cycle current limiting. |
| Industrial temperature grade | Full –40°C to 125°C operation guaranteed and tested; no derating required for embedded industrial use. |
| Low-noise synchronization | External clock sync preserves 180° phase relationship and auto-adjusts slope compensation to prevent subharmonics. |
Applications
| DSP Power Supplies | PCI Cards |
|---|---|
Use Scenario: Dual-rail power for TI C6000 or ADI SHARC processors requiring tightly tracked 3.3V I/O and 1.8V core rails with controlled startup sequence. IC Role / Device Role / Timing Role: Monolithic dual buck regulator providing independent soft-start, antiphase switching, and per-rail power-good signaling. Use Value: Eliminates discrete sequencing ICs and reduces BOM count while maintaining 1.8V rail within ±2% of 3.3V during ramp-up. |
Use Scenario: Compact, thermally efficient 3.3V/1.8V conversion on space-constrained PCI add-in cards with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter with exposed-pad TSSOP package enabling direct thermal coupling to PCB copper. Use Value: Achieves 82% efficiency at 2A per rail with 250kHz switching, reducing heat buildup and eliminating need for heatsinks. |
| DSL/Cable Modems | Wall Transformer Regulation |
Use Scenario: High-reliability 12V-to-3.3V/1.8V conversion in residential broadband gateways operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: Industrial-grade dual buck regulator with 125°C junction rating and enhanced short-circuit protection. Use Value: Sustains full 2A load per rail over full temperature range without thermal shutdown or output droop. |
Use Scenario: Replacement for linear regulators in AC/DC wall adapters needing 5V/3.3V dual outputs with minimal footprint. IC Role / Device Role / Timing Role: High-efficiency switching regulator supporting wide 3.1V–25V input to accommodate unregulated transformer outputs. Use Value: Reduces adapter size by 40% vs. linear solution and eliminates thermal derating above 50°C ambient. |
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 |
|---|---|---|---|
| LTC3776EFE | Two-phase synchronous buck controller (external MOSFETs); supports up to 20A per phase; no integrated switches. | Used where higher current (>4A), higher efficiency (>95%), or custom FET selection is required; needs more external components. | Select LTC3776EFE when scaling beyond 2A/channel or requiring PMBus telemetry; LT3510IFE offers lower BOM cost and simpler layout for ≤2A designs. |
| TPS54290PWPR | Dual 2A synchronous buck converter (integrated FETs); 4.5V–18V input; fixed 500kHz/600kHz; no antiphase or tracking support. | Targeted at cost-sensitive consumer applications; lacks independent soft-start, PG, or tracking pins. | Choose TPS54290PWPR only for non-critical dual-rail systems without sequencing requirements; LT3510IFE provides superior control flexibility and industrial temp validation. |
Compared with LTC3776EFE and TPS54290PWPR, the LT3510IFE uniquely combines integrated 2.5A NPN switches, guaranteed –40°C to 125°C operation, antiphase synchronization, and per-channel tracking/soft-start in a single 20-pin TSSOP - making it optimal for compact, thermally constrained industrial and telecom power designs where reliability and sequencing precision are critical.
Availability
LT3510IFE is available at Aetrix Electronics and suitable for DSP power supplies, PCI cards, and DSL/cable modems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3510IFE 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 (including former Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and medical markets.
The LT3510IFE belongs to Linear Technology's high-reliability power conversion portfolio, designed specifically for compact, multi-rail embedded systems demanding precise tracking, robust thermal performance, and guaranteed operation across harsh industrial environments.
FAQ
What is the guaranteed operating temperature range for the LT3510IFE?
The LT3510IFE is fully guaranteed and tested over the –40°C to 125°C junction temperature range. Unlike the E-grade variant, the IFE grade undergoes extended characterization and statistical process control to ensure all electrical specifications - including feedback voltage, shutdown threshold, and switching frequency - remain valid across this full industrial range without derating.
Can the LT3510IFE operate with input voltage below 3.1V?
Yes - the LT3510IFE has a minimum input voltage specification of 2.8V (per Electrical Characteristics table), defined as the point where internal bias lines stabilize. While the recommended operating range starts at 3.1V, the device will start and regulate down to ~2.8V under light loads, especially when using the 95% dropout mode enabled by proper BST capacitor sizing and layout.
How does the LT3510IFE achieve 180° antiphase switching between channels?
The LT3510IFE uses an internal oscillator that generates two complementary clock signals with fixed 180° phase offset. This timing is maintained whether operating in resistor-programmed mode (via RT/SYNC) or external synchronization mode - ensuring consistent input ripple reduction and thermal balancing regardless of frequency setting or sync source.
What is the purpose of the SS/TRACK pins on the LT3510IFE?
The SS/TRACK1 and SS/TRACK2 pins on the LT3510IFE provide independent control of each channel's soft-start ramp rate and tracking behavior. A single capacitor to ground sets the ramp time; connecting SS pins together enables ratiometric tracking, while separate capacitors allow sequential or absolute timing control - all without external op-amps or discrete logic.
Does the LT3510IFE support external synchronization, and what is its frequency range?
Yes, the LT3510IFE supports external clock synchronization via the RT/SYNC pin across 250kHz to 1.5MHz. The device locks to the rising edge of the external signal, maintains 180° channel phase separation, and automatically adjusts internal slope compensation to prevent subharmonic oscillation - verified in Typical Performance Characteristics Figure G15.
LT3510IFE 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:
- Obsolete
- 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
LT3510IFE FAQ
1.How can I place an order for LT3510IFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3510IFE 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 LT3510IFE reliable?
The price and inventory of LT3510IFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3510IFE is usually 5 days.
3.What payment methods are accepted for LT3510IFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3510IFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3510IFE?
LT3510IFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3510IFE 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 LT3510IFE?
For technical support, including LT3510IFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3510IFE requirements.
6.How does Aetrix verify that LT3510IFE is sourced from the original manufacturer or authorized distributors?
All LT3510IFE 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 LT3510IFE meets industry standards.
7.What is the process for return or replacement of LT3510IFE?
All LT3510IFE units undergo pre-shipment inspection (PSI). If there is an issue with LT3510IFE, 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 LT3510IFE part is unused and in its original packaging.
Return procedure for LT3510IFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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