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Analog Devices Inc. LT3430EFE-1#PBF
- Part No.:
- LT3430EFE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3430EFE-1#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:268
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Product details
Overview
LT3430EFE-1#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 to 60V input, delivers up to 2A output at 5V, features a 100kHz fixed switching frequency, integrates a 0.1Ω NPN power switch, and operates across –40°C to 125°C junction temperature in a thermally enhanced 16-pin TSSOP package.
For engineers reviewing the LT3430EFE-1#PBF datasheet, LT3430EFE-1#PBF pinout, LT3430EFE-1#PBF application, or LT3430EFE-1#PBF equivalent, key selection criteria include its 100kHz constant-frequency operation, 3A peak switch current capability over full duty cycle, 1.22V feedback reference, SYNC pin compatibility with 125–250kHz external clocks, and thermal performance enabled by exposed GND pad soldering.
Technical Context
The LT3430EFE-1#PBF implements a current-mode control architecture with cycle-by-cycle peak current limiting and internal slope compensation, enabling fast transient response and stable loop behavior across wide input/output conditions. Its oscillator is factory-trimmed to 100kHz (LT3430-1 variant), with ±12% tolerance over temperature and line.
It uses a BOOST pin-driven charge pump to saturate the integrated 0.1Ω NPN switch, reducing conduction loss versus standard bipolar implementations. The BIAS pin allows output-derived biasing to improve light-load efficiency when VOUT ≥ 3V, and the SHDN pin provides dual-threshold control: 2.38V UVLO and 0.4V micropower shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports 12V/24V/48V industrial and automotive rails without pre-regulation |
| Switching Frequency | 100kHz (±12%) - fixed frequency enables predictable EMI filtering and simplifies inductor selection |
| Peak Switch Current | 3A over full duty cycle - maintains current limit integrity even at high duty cycles (>90%), unlike conventional current-mode controllers |
| Switch On Resistance | 0.1Ω (typ) - reduces conduction loss and thermal stress at 2A load, enabling compact thermal design |
| Feedback Reference | 1.22V (±1.2%) - precise voltage setting enables accurate output regulation with standard resistor dividers |
| Shutdown Current | 30µA (max) - enables ultra-low-power system standby modes in battery-backed applications |
| Operating Temp Range | –40°C to 125°C (junction) - qualified for under-hood automotive and industrial environments |
| Package | 16-pin TSSOP with exposed GND pad - θJA = 45°C/W; requires PCB ground plane connection for thermal compliance |
Pinout & Package
LT3430EFE-1#PBF is housed in a 16-lead plastic TSSOP package (FE) with an exposed GND pad (Pin 17) that must be soldered to the PCB ground plane for thermal and electrical integrity. Pin pitch is 0.65mm; body dimensions are 5mm × 4.4mm × 1.2mm.
| 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) | Emitter of internal NPN power switch | High dI/dt node; connects directly to inductor and catch diode cathode; negative swing clamped externally |
| VIN (Pins 3, 4) | Collector of internal NPN power switch and primary supply input | Carries full input current; requires low-inductance path to input capacitor to suppress switching spikes |
| BOOST (Pin 6) | Charge pump drive for switch saturation | Must be connected to external diode/capacitor network; enables <0.1Ω effective RCE(sat) at high VIN |
| BIAS (Pin 10) | External bias supply input | Connect to regulated output (≥3V) to reduce input supply current and improve light-load efficiency |
| VC (Pin 11) | Error amplifier output / current limit comparator input | Used for loop compensation; also serves as current clamp point; voltage range ~0.9V–2.1V under load |
| FB (Pin 12) | Output voltage sensing input | 1.22V reference; also enables frequency foldback (<0.8V) and current limit reduction (<0.6V) during fault conditions |
| SYNC (Pin 14) | External clock synchronization input | Logic-level compatible; accepts 125–250kHz square wave (10–90% duty); disables internal oscillator when driven |
| SHDN (Pin 15) | Enable/disable control with UVLO | 2.38V threshold enables input undervoltage lockout; 0.4V threshold forces micropower shutdown (30µA IQ) |
| NC (Pins 7, 13) | No connection | Not internally bonded; must remain unconnected on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Patented peak current maintenance | Maintains 3A switch current limit across 0–98% duty cycle - eliminates current derating at high VOUT/VIN ratios |
| Integrated BOOST driver | Enables NPN switch saturation via external capacitor/diode - achieves FET-like 0.1Ω RCE(sat) without discrete gate driver |
| Frequency and current foldback | Reduces switching frequency (5:1) and peak current limit (<2A) when FB < 0.8V/<0.6V - limits power dissipation during short-circuit faults |
| Dual-threshold SHDN pin | 2.38V UVLO prevents startup until input rail is valid; 0.4V deep shutdown reduces IQ to 30µA - supports battery backup and safety interlocks |
| Thermally enhanced TSSOP | Exposed GND pad (Pin 17) with θJC = 10°C/W - enables >2A continuous operation at 125°C ambient with proper PCB copper area |
Applications
| Industrial Power Supply | Automotive DC-DC Conversion |
|---|---|
Use Scenario: 24V truck battery powering 5V logic and sensors in engine control unit (ECU). IC Role / Device Role / Timing Role: Primary buck regulator converting 9–36V nominal battery to stable 5V rail with high PSRR and transient immunity. Use Value: 60V absolute max input withstands load-dump transients; 100kHz switching enables small 68µH inductor per LT3430-1 design guidelines; thermal robustness sustains operation at 125°C junction. | Use Scenario: 48V mild-hybrid vehicle subsystem supplying 5V to infotainment display and CAN transceivers. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from 36–60V battery with SYNC pin locked to system clock for EMI coherence. Use Value: BIAS pin connected to 5V output improves light-load efficiency; SYNC range (125–250kHz) aligns with automotive clock domains; –40°C to 125°C rating meets AEC-Q200 requirements. |
| Portable Computing Power | Distributed Power System |
Use Scenario: 19V laptop adapter powering 5V USB-C PD auxiliary rail and SSD controller. IC Role / Device Role / Timing Role: Secondary buck stage delivering regulated 5V at up to 2A with minimal board space and thermal footprint. Use Value: 16-pin TSSOP with exposed pad fits dense layouts; 100kHz frequency balances size vs. efficiency; FB foldback protects against hot-plug short circuits. | Use Scenario: Telecom shelf with 48V backplane powering isolated 5V point-of-load converters for FPGA I/O banks. IC Role / Device Role / Timing Role: Non-isolated intermediate bus converter feeding downstream regulators; synchronized to system master clock. Use Value: SYNC pin enables deterministic EMI spectrum; 3A peak current supports dynamic FPGA load steps; thermal design supports convection-cooled chassis. |
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 |
|---|---|---|---|
| LTC3630EMSE-5#PBF | Monolithic 5V fixed-output buck; 40V max input; 1.2MHz switching; no SYNC or BOOST pin | Better for space-constrained, fixed 5V designs; lacks high-VIN headroom and external sync capability | Select when 5V output is fixed, input ≤40V, and high-frequency operation is preferred over thermal efficiency |
| LM5164QPWPRQ1 | 42V max input; 100kHz–2.2MHz adjustable frequency; integrated MOSFETs; no BOOST pin; AEC-Q100 qualified | Designed for automotive qualification; higher integration but lower max input than LT3430EFE-1#PBF | Select when AEC-Q100 certification is mandatory and 60V input tolerance is not required |
Compared with LTC3630EMSE-5#PBF and LM5164QPWPRQ1, LT3430EFE-1#PBF uniquely combines 60V input rating, 100kHz fixed frequency, BOOST-enabled NPN saturation, and dual-threshold SHDN - making it optimal for ruggedized industrial and non-certified automotive systems requiring maximum input headroom and predictable thermal behavior.
Availability
LT3430EFE-1#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC conversion, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3430EFE-1#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3430/LT3430-1 product line was developed by Linear Technology to address high-input-voltage DC-DC conversion needs in harsh environments, emphasizing thermal resilience, fault protection, and wide-duty-cycle current-mode control for industrial and transportation applications.
FAQ
What is the maximum input voltage rating for the LT3430EFE-1#PBF?
The LT3430EFE-1#PBF has an absolute maximum input voltage rating of 60V on the VIN pins. It is specified to operate continuously from 5.5V to 60V, making it suitable for 24V and 48V industrial systems and automotive battery rails including load-dump transients. Operation above 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT3430EFE-1#PBF require an external BOOST capacitor and diode?
Yes, the LT3430EFE-1#PBF requires an external BOOST capacitor and diode connected between the BOOST and SW pins to saturate the internal NPN power switch. Without this network, switch conduction loss increases significantly - the BOOST circuit enables the 0.1Ω typical RCE(sat) performance cited in the datasheet. Typical values are a 100nF ceramic capacitor and a Schottky diode such as MMSD914.
How does the LT3430EFE-1#PBF differ from the standard LT3430 version?
The LT3430EFE-1#PBF is the 100kHz variant of the LT3430 family, whereas the LT3430 operates at 200kHz. Key differences include: 100kHz vs. 200kHz switching frequency, 125–250kHz vs. 228–700kHz SYNC range, and optimized inductor recommendations (68µH vs. 27µH). All other electrical specifications, pinout, and package are identical between LT3430 and LT3430-1 variants.
Can the LT3430EFE-1#PBF be synchronized to an external clock?
Yes, the LT3430EFE-1#PBF supports external synchronization via its SYNC pin, which accepts logic-level square waves from 125kHz to 250kHz with 10–90% duty cycle. When an external clock is applied, the internal oscillator is disabled and switching follows the external signal - enabling EMI reduction through frequency alignment and multi-phase interleaving in complex power systems.
What thermal design considerations apply to the LT3430EFE-1#PBF?
The LT3430EFE-1#PBF uses a 16-pin TSSOP package with an exposed GND pad (Pin 17) that must be soldered to a minimum 100mm² copper area on the PCB to achieve θJA = 45°C/W. For 2A operation at 125°C ambient, thermal vias under the pad and inner-layer ground planes are recommended. Junction temperature must not exceed 125°C continuously; the device includes thermal shutdown but relies on proper layout for sustained reliability.
LT3430EFE-1#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):
- 58.8V
- Current - Output:
- 3A
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3430EFE-1#PBF FAQ
1.How can I place an order for LT3430EFE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3430EFE-1#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-1#PBF reliable?
The price and inventory of LT3430EFE-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LT3430EFE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3430EFE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3430EFE-1#PBF?
LT3430EFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3430EFE-1#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-1#PBF?
For technical support, including LT3430EFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3430EFE-1#PBF requirements.
6.How does Aetrix verify that LT3430EFE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT3430EFE-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LT3430EFE-1#PBF?
All LT3430EFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3430EFE-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LT3430EFE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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