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Analog Devices Inc. LT3430EFE#PBF
- Part No.:
- LT3430EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3430EFE#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,527
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Product details
Overview
LT3430EFE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode synchronous buck switching regulator IC designed for industrial and automotive power conversion. It accepts 5.5V–60V input, delivers up to 2A output at 5V, integrates a 3A/0.1Ω NPN power switch, operates at fixed 200kHz switching frequency, and features 1.22V feedback reference with cycle-by-cycle current limiting - used in battery chargers and distributed power systems.
For engineers reviewing the LT3430EFE#PBF datasheet, LT3430EFE#PBF pinout, LT3430EFE#PBF application, or LT3430EFE#PBF equivalent, key selection criteria include its 60V max input rating, thermally enhanced 16-pin TSSOP package with exposed GND pad, shutdown current of 30µA, SYNC capability up to 700kHz, and BIAS pin efficiency optimization for high VIN-to-VOUT ratios.
Technical Context
The LT3430EFE#PBF implements constant-frequency current-mode control with dual feedback loops: an error amplifier sets the peak switch current threshold via the VC pin, while a current-sense amplifier monitors switch emitter voltage on each cycle. Its patented architecture maintains 3A peak switch current across full duty cycle range (0–93%), eliminating typical current-limit roll-off above 50% duty.
It uses a BOOST pin-driven external charge pump (diode + capacitor) to saturate the internal NPN switch, achieving 0.1Ω on-resistance and minimizing conduction loss. The BIAS pin enables output-derived biasing above 3V output, reducing total input-referred quiescent current to 2.5mA and improving light-load efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Switching Frequency | 200kHz (fixed) - enables compact magnetics and predictable EMI profile; externally synchronizable from 228kHz to 700kHz. |
| Peak Switch Current | 3A over full duty cycle - sustains high output current even at low VOUT/VIN ratios (e.g., 5V out from 42V input). |
| Switch On Resistance | 0.1Ω - reduces conduction loss and thermal stress under 2A load; enabled by BOOST pin voltage boosting. |
| Feedback Reference | 1.22V ±1.5% - precise setpoint for stable output regulation; FB pin also enables frequency foldback below 0.8V and current limit reduction below 0.6V. |
| Shutdown Current | 30µA - ultra-low quiescent draw during standby; SHDN pin has dual thresholds (2.38V UVLO, 0.4V deep shutdown). |
| Junction Temperature | –40°C to 125°C - rated for extended industrial and under-hood automotive environments. |
Pinout & Package
LT3430EFE#PBF is housed in a 16-lead plastic TSSOP package with exposed thermal pad (Pin 17), which must be soldered to PCB ground plane for thermal performance (θJC = 10°C/W). Pin functions are validated per Linear Technology's official datasheet (34301fa).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16, 17) | Power and signal reference ground | Multiple GND pins and exposed pad minimize ground impedance; critical for load regulation and thermal dissipation. |
| SW (Pins 2, 5) | Switch emitter node | Drives inductor; clamped negative swing during off-time requires external catch diode; voltage swings from –0.8V to VIN. |
| VIN (Pins 3, 4) | Switch collector and primary supply | Supplies internal circuitry when BIAS is unconnected; high dI/dt path requires short layout to bypass capacitor and SW. |
| BOOST (Pin 6) | Charge-pump drive for switch saturation | Enables ~0.1Ω on-resistance by providing >VIN voltage to base drive; requires external diode + capacitor network. |
| BIAS (Pin 10) | Secondary bias supply input | Connect to regulated output ≥3V to shift internal bias current from VIN to VOUT, reducing total input current and improving efficiency. |
| VC (Pin 11) | Error amplifier output / current limit comparator input | Direct access to control loop; 0.9V–2.1V swing reflects load; used for compensation, current clamping, or override. |
| FB (Pin 12) | Output voltage sensing input | 1.22V reference; also triggers frequency foldback (<0.8V) and current limit reduction (<0.6V) during fault conditions. |
| SYNC (Pin 14) | External oscillator synchronization input | Logic-level compatible; accepts 228–700kHz square wave (10–90% duty) to eliminate beat frequencies in multi-rail systems. |
| SHDN (Pin 15) | Enable/disable control with UVLO | 2.38V threshold enables undervoltage lockout; 0.4V threshold forces micropower shutdown (30µA IQ). |
Key Features
| Feature | Design Value |
|---|---|
| Patented constant peak switch current | Maintains 3A limit across 0–93% duty cycle - eliminates need for derating at high VIN/VOUT ratios. |
| BOOST pin saturation drive | Reduces effective switch resistance to 0.1Ω - achieves FET-like conduction loss using bipolar process. |
| Two-threshold SHDN pin | 2.38V UVLO prevents startup until input reaches safe level; 0.4V deep shutdown cuts IQ to 30µA. |
| FB pin integrated protection | Automatically reduces switching frequency and peak current during short-circuit - limits power dissipation in IC and external components. |
| BIAS pin efficiency optimization | Shifts internal bias current from VIN to VOUT ≥3V - lowers total input-referred quiescent current to 2.5mA. |
Applications
| Industrial Power Supply | Automotive Battery Charger |
|---|---|
Use Scenario: 24V/48V bus-powered PLC I/O module requiring isolated 5V/2A rail. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 42V nominal vehicle battery to stable 5V logic supply. Use Value: 60V absolute max input withstands load-dump transients; 200kHz operation allows small 22µH inductor and ceramic output cap. |
Use Scenario: On-board 12V-to-5V USB charging port in commercial vehicle infotainment system. IC Role / Device Role / Timing Role: High-efficiency step-down converter powering USB-PD controller and Type-A ports. Use Value: BIAS pin connected to 5V output improves light-load efficiency; SYNC pin aligns switching to system clock to reduce EMI coupling. |
| Portable Computer Adapter | Distributed Telecom Power |
Use Scenario: Universal AC/DC adapter delivering 5V/2A to ruggedized tablet with wide-input DC jack (9–36V). IC Role / Device Role / Timing Role: Secondary-stage buck regulator after front-end PFC or wide-range DC-DC stage. Use Value: 5.5V min input enables operation down to brownout conditions; thermal TSSOP package supports convection-cooled enclosure. |
Use Scenario: Point-of-load converter in 48V telecom shelf supplying 5V/2A to FPGA mezzanine card. IC Role / Device Role / Timing Role: Local buck regulator accepting 36–72V telecom input range and delivering tightly regulated 5V. Use Value: 125°C junction rating ensures reliability in sealed chassis; exposed pad enables direct thermal coupling to cold plate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | 40V max input, 1.5A output, 3mm × 4mm MSOP; no BOOST pin; uses MOSFET switch. | Lower voltage/current rating; lacks high-VIN robustness and BOOST-enabled low RDS(on); better for space-constrained 24V systems. | Select LTC3631EMSE#PBF only if input stays ≤40V and peak load ≤1.5A; not suitable for 48V+ or 2A+ designs. |
| MPQ4333GQ-AEC1-P | 60V max input, 3A output, 2.2MHz switching, QFN-16; integrated MOSFETs; AEC-Q100 qualified. | Higher frequency enables smaller inductors; automotive grade; lacks BIAS pin and dual-threshold SHDN; different compensation scheme. | Choose MPQ4333GQ-AEC1-P for automotive production where AEC-Q100 compliance and 2.2MHz operation are required; verify thermal design at 2A continuous. |
Compared with LTC3631EMSE#PBF and MPQ4333GQ-AEC1-P, LT3430EFE#PBF uniquely combines 60V input tolerance, 3A peak switch current across full duty cycle, BOOST-assisted 0.1Ω on-resistance, and dual-threshold SHDN - making it optimal for industrial 48V systems requiring fault resilience and thermal margin without automotive qualification overhead.
Availability
LT3430EFE#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery chargers, and distributed telecom power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3430EFE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3430 product line was developed specifically for high-input-voltage industrial and automotive DC-DC conversion, emphasizing robustness, thermal efficiency, and fault protection in harsh environments.
FAQ
What is the maximum input voltage rating for the LT3430EFE#PBF?
The LT3430EFE#PBF has an absolute maximum input voltage rating of 60V on the VIN pin, with guaranteed operation from 5.5V to 60V. This makes it suitable for 48V industrial buses and automotive applications where load dump transients occur. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT3430EFE#PBF require an external BOOST capacitor and diode?
Yes, the LT3430EFE#PBF requires an external BOOST capacitor and Schottky diode (e.g., MMSD914) connected between VIN and BOOST pins. This network generates a voltage higher than VIN to fully saturate the internal NPN switch, enabling its specified 0.1Ω on-resistance and high efficiency across the input range.
Can the LT3430EFE#PBF be synchronized to an external clock?
Yes, the LT3430EFE#PBF supports external synchronization via the SYNC pin, accepting logic-level square waves from 228kHz to 700kHz with 10–90% duty cycle. This feature eliminates beat frequencies in multi-rail systems and simplifies EMI filtering by aligning switching edges across converters.
What is the purpose of the BIAS pin on the LT3430EFE#PBF?
The BIAS pin on the LT3430EFE#PBF allows connecting the IC's internal bias circuitry to the regulated output (≥3V) instead of VIN. This reduces total input-referred quiescent current to 2.5mA and improves light-load efficiency - especially valuable when VIN is significantly higher than VOUT, such as 42V-to-5V conversion.
How does the LT3430EFE#PBF handle short-circuit conditions?
The LT3430EFE#PBF implements dual-foldback protection triggered by the FB pin: switching frequency reduces ~5:1 when FB falls below 0.8V, and peak switch current drops when FB falls below 0.6V. This limits power dissipation in the IC, external diode, and inductor during sustained faults without requiring external circuitry.
LT3430EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.219V
- Voltage - Output (Max):
- 57.6V
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3430EFE#PBF FAQ
1.How can I place an order for LT3430EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3430EFE#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 LT3430EFE#PBF reliable?
The price and inventory of LT3430EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3430EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3430EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3430EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3430EFE#PBF?
LT3430EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3430EFE#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 LT3430EFE#PBF?
For technical support, including LT3430EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3430EFE#PBF requirements.
6.How does Aetrix verify that LT3430EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3430EFE#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 LT3430EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3430EFE#PBF?
All LT3430EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3430EFE#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 LT3430EFE#PBF part is unused and in its original packaging.
Return procedure for LT3430EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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