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Analog Devices Inc. LT3510IFE#PBF
- Part No.:
- LT3510IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3510IFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A DL 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:149
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Product details
Overview
LT3510IFE#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 dual-output power supplies. It supports input voltages from 3.1V to 25V, delivers up to 2A per channel, and features antiphase switching at 250kHz–1.5MHz to reduce input ripple and EMI. It is widely used in DSP power supplies, disc drives, and PCI cards requiring tight output tracking and sequencing.
For engineers reviewing the LT3510IFE#PBF datasheet, LT3510IFE#PBF pinout, LT3510IFE#PBF application, or LT3510IFE#PBF equivalent, key selection considerations include its dual-channel independent soft-start and power-good signaling, 95% maximum duty cycle for low-dropout operation, 180° phase relationship between channels, and exposed-pad 20-lead TSSOP thermal performance.
Technical Context
The LT3510IFE#PBF implements current-mode control per channel using an internal transconductance error amplifier (275 μmho typical gm), peak-current sensing via IND/VOUT pins, and slope-compensated oscillator timing. Each channel has independent feedback (0.8V nominal reference), VC loop control, and soft-start circuitry with 3.25μA source current.
It supports resistor-programmed (RT/SYNC pin) or external clock synchronization, maintaining precise 180° phase offset across the full 250kHz–1.5MHz range. The device integrates undervoltage lockout on VIN1, thermal shutdown, and enhanced short-circuit protection with automatic soft-start recovery after overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 25V - enables direct regulation from wide-range wall adapters, industrial rails, or battery stacks without pre-regulation. |
| Output Current per Channel | 2A continuous - sufficient for powering core logic (e.g., 3.3V/1.8V DSP I/O and core rails) with margin. |
| Switching Frequency Range | 250kHz to 1.5MHz - allows trade-off between efficiency (lower f) and component size (higher f); programmable via RT/SYNC resistor or external clock. |
| Feedback Reference Voltage | 0.8V ±2% - stable over –40°C to 125°C; enables accurate output setting with standard resistor dividers. |
| Maximum Duty Cycle | ~95% - supports ultra-low dropout operation (e.g., 3.3V out from 3.6V in), critical for battery-powered systems near end-of-discharge. |
| Shutdown Quiescent Current | 9μA typical - minimizes system standby power loss; SHDN pin threshold is 1.28V with hysteresis for clean UVLO behavior. |
| Power Good Accuracy | ±3% (90% VOUT threshold with 30mV hysteresis) - provides reliable rail monitoring for FPGA/CPU reset sequencing. |
Pinout & Package
The LT3510IFE#PBF is housed in a 20-lead TSSOP package with exposed leadframe (Pin 21 = GND), optimized for low thermal resistance (θJC(PAD) = 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) | Channel 1 current sense input | Measures inductor current via internal sense resistor; bias current flows out if voltage <1.6V. |
| VOUT1 (4) | Channel 1 current sense return | Completes current-sense path; bias current flows out if voltage <1.6V. |
| PG1 (5) | Channel 1 open-collector power-good | Sinks current when FB1 falls below 90% of 0.8V; can be wire-OR'd with PG2. |
| PG2 (6) | Channel 2 open-collector power-good | Same function as PG1; independent monitoring enables per-rail fault isolation. |
| VOUT2 (7) | Channel 2 current sense return | Matches VOUT1 function for Channel 2; shares same small-signal ground reference. |
| IND2 (8) | Channel 2 current sense input | Matches IND1 function for Channel 2; enables independent current limiting per channel. |
| SW2 (9) | Channel 2 switch emitter | Matches SW1 function; antiphase switching reduces input capacitor RMS current. |
| VIN2 (10) | Channel 2 switch collector | Independent from VIN1; allows separate input sources or shared rail with localized decoupling. |
| BST2 (11) | Channel 2 bootstrap drive | Supplies >VIN base drive to NPN switch; requires external capacitor to enable 100% duty cycle. |
| SS/TRACK2 (12) | Channel 2 soft-start & tracking control | Capacitor-to-ground sets ramp rate; enables ratiometric, sequential, or absolute tracking with SS1. |
| VC2 (13) | Channel 2 error amplifier output | Drives peak-current comparator; used for loop compensation, current clamping, or override. |
| FB2 (14) | Channel 2 feedback input | Regulated to 0.8V; connects to resistor divider from VOUT2 for output programming. |
| SHDN (15) | Global shutdown control | Active-high; 1.28V threshold enables integrated UVLO; pulls both channels into <10μA shutdown. |
| RT/SYNC (16) | Frequency programming & sync input | Resistor-to-GND sets frequency (250kHz–1.5MHz); external clock synchronizes both channels. |
| FB1 (17) | Channel 1 feedback input | Identical to FB2; independent regulation enables mismatched output voltages (e.g., 3.3V/1.8V). |
| VC1 (18) | Channel 1 error amplifier output | Identical to VC2; supports individual loop compensation per channel. |
| SS/TRACK1 (19) | Channel 1 soft-start & tracking control | Identical to SS/TRACK2; enables independent or coordinated startup with Channel 2. |
| BST1 (20) | Channel 1 bootstrap drive | Identical to BST2; requires dedicated 0.1μF ceramic capacitor to SW1. |
| Exposed Pad (21) | Thermal & signal ground | Only GND connection; must be soldered to large PCB copper area for θJA = 45°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase switching | 180° channel phase offset reduces input capacitor RMS current by ~30%, lowering required capacitance and EMI filtering burden. |
| Independent tracking/sequencing | Separate SS/TRACK pins allow ratiometric (e.g., 1.8V rising at half rate of 3.3V), sequential, or absolute tracking-critical for FPGA or multi-rail ASIC power-up. |
| Enhanced dropout operation | ~95% max duty cycle enables regulation with minimal VIN–VOUT headroom (e.g., 3.3V out from 3.6V input), extending battery runtime. |
| Integrated power-good monitoring | Dual open-collector PG outputs with 90% threshold and 30mV hysteresis provide reliable rail validation for system reset controllers. |
| Robust short-circuit protection | Current-mode architecture with cycle-by-cycle peak limiting and automatic soft-start recovery prevents latch-up during sustained overload. |
Applications
| DSP Power Supplies | Disc Drives |
|---|---|
Use Scenario: Powering digital signal processors with split-core (e.g., 1.2V core, 3.3V I/O) and memory interface rails. IC Role / Device Role / Timing Role: Dual-output buck regulator providing independently sequenced, tracked, or isolated voltage domains with precise power-good signaling. Use Value: Eliminates need for discrete sequencing ICs; 180° antiphase operation cuts input ripple, reducing bulk capacitor count and board area. | Use Scenario: Supplying spindle motor driver, servo controller, and buffer memory in HDD/ODD systems. IC Role / Device Role / Timing Role: High-efficiency dual regulator delivering 5V/3.3V or 12V/5V rails with fast transient response and low-noise operation. Use Value: 2A per channel supports peak motor current demands; 25V max input accommodates unregulated 19V wall adapters. |
| DSL/Cable Modems | PCI Cards |
Use Scenario: Generating multiple low-noise analog and digital rails (e.g., 3.3V, 1.8V, 1.2V) from a single 12V or 5V input in broadband access equipment. IC Role / Device Role / Timing Role: Compact dual buck converter enabling space-constrained designs with independent soft-start and rail monitoring. Use Value: Exposed-pad TSSOP ensures thermal reliability in sealed enclosures; 250kHz–1.5MHz programmability optimizes efficiency vs. size. | Use Scenario: Providing regulated 3.3V and 1.8V or 1.5V rails for PCIe endpoint logic, SerDes, and configuration EEPROM on add-in cards. IC Role / Device Role / Timing Role: Dual synchronous buck regulator supporting hot-plug compliance via controlled power-up sequencing and PG assertion. Use Value: Independent SS/TRACK pins meet PCIe power sequencing requirements; 95% duty cycle supports 3.3V rail from marginal 3.6V auxiliary supply. |
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 |
|---|---|---|---|
| LM26420XMH/NOPB | 2.2A per channel, 4.5V–5.5V input only, no antiphase, fixed 600kHz/1.2MHz frequencies | Limited to narrow-input systems; lacks independent tracking/soft-start and 180° phase control | Choose for cost-sensitive, fixed-frequency 5V-input applications where antiphase and wide VIN are unnecessary. |
| TPS54290PWPR | 2A per channel, 4.5V–28V input, external MOSFETs, no integrated switches, requires more external components | Higher design complexity and BOM count; supports higher efficiency at high load but needs gate drivers and FETs | Choose when >95% efficiency at full load or >28V input is required; not drop-in due to topology and pinout differences. |
Compared with LM26420XMH/NOPB and TPS54290PWPR, the LT3510IFE#PBF uniquely combines wide 3.1V–25V input, integrated 2.5A NPN switches, antiphase operation, and independent tracking in a single 20-pin TSSOP-making it optimal for compact, multi-rail embedded systems demanding sequencing flexibility and thermal efficiency.
Availability
LT3510IFE#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 consistent lead-free packaging.
Supply support for LT3510IFE#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 legacy of high-performance analog and power management ICs with rigorous characterization and long-lifecycle support.
The LT3510IFE#PBF belongs to Linear's monolithic DC/DC converter product line, engineered for high-density, multi-rail power systems in communications, computing, and industrial equipment where sequencing, tracking, and thermal robustness are critical.
FAQ
What is the operating temperature range for the LT3510IFE#PBF?
The LT3510IFE#PBF is specified and tested over the full –40°C to +125°C junction temperature range. Its internal thermal shutdown activates above 125°C to protect against sustained overload, and the exposed-pad TSSOP package ensures reliable thermal dissipation under continuous 2A-per-channel load conditions. This makes the LT3510IFE#PBF suitable for industrial and automotive under-hood applications where ambient temperatures exceed 85°C.
How does the LT3510IFE#PBF achieve 95% maximum duty cycle?
The LT3510IFE#PBF achieves ~95% maximum duty cycle by allowing the internal NPN switch to remain on for multiple clock cycles when the boost capacitor voltage remains sufficient to maintain saturation. Only when the BST voltage drops below the minimum threshold (~1.7V) does the device enforce a minimum off-time to recharge the capacitor. This dropout enhancement enables regulation with minimal VIN–VOUT differential-e.g., 3.3V output from a 3.6V input-without external LDO post-regulation. The LT3510IFE#PBF implements this behavior autonomously without external circuitry.
Can the two channels of the LT3510IFE#PBF be paralleled for higher current?
Yes, the LT3510IFE#PBF datasheet explicitly states that its outputs can be paralleled to increase total current capability. This is enabled by matching internal current-sense gain and error amplifier characteristics across channels, combined with antiphase switching that inherently balances ripple current. To parallel channels, connect VOUT1 and VOUT2 together, tie FB1 and FB2 to a common resistor divider, and ensure matched inductor values and layout symmetry. The LT3510IFE#PBF supports up to 4A combined output with proper thermal management and current-sharing verification.
What is the purpose of the SS/TRACK pins on the LT3510IFE#PBF?
The SS/TRACK1 and SS/TRACK2 pins on the LT3510IFE#PBF serve dual functions: soft-start control and output voltage tracking. A capacitor from each pin to ground sets the output voltage ramp rate during startup. When tied together or driven by external circuitry, they enable ratiometric (e.g., 1.8V rising at half the rate of 3.3V), sequential (e.g., 3.3V before 1.8V), or absolute (e.g., both rails tracking a master reference) tracking modes. This eliminates external sequencing ICs and simplifies power-up timing for FPGAs and multi-core processors. The LT3510IFE#PBF supports all three modes natively.
Does the LT3510IFE#PBF require external Schottky diodes?
Yes, the LT3510IFE#PBF requires external Schottky catch diodes connected from each SW pin to ground. Because it uses internal NPN power switches (not MOSFETs), it cannot integrate synchronous rectification. The diodes-such as PMEG4005 specified in the典型 application-must be placed close to the SW pins and their respective VIN decoupling capacitors to minimize parasitic inductance and prevent negative voltage excursions exceeding –0.3V. Omitting or misplacing these diodes risks switch damage and unstable regulation. The LT3510IFE#PBF relies on this external diode path for inductor freewheeling.
LT3510IFE#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
LT3510IFE#PBF FAQ
1.How can I place an order for LT3510IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3510IFE#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 LT3510IFE#PBF reliable?
The price and inventory of LT3510IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3510IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3510IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3510IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3510IFE#PBF?
LT3510IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3510IFE#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 LT3510IFE#PBF?
For technical support, including LT3510IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3510IFE#PBF requirements.
6.How does Aetrix verify that LT3510IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3510IFE#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 LT3510IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3510IFE#PBF?
All LT3510IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3510IFE#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 LT3510IFE#PBF part is unused and in its original packaging.
Return procedure for LT3510IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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