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Analog Devices Inc. LT3430EFE#TRPBF
- Part No.:
- LT3430EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3430EFE#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,564
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Product details
Overview
LT3430EFE#TRPBF 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.
For engineers reviewing the LT3430EFE#TRPBF datasheet, LT3430EFE#TRPBF pinout, LT3430EFE#TRPBF application, or LT3430EFE#TRPBF equivalent, key selection criteria include wide-input-range DC/DC conversion capability, thermal performance in TSSOP-16 with exposed pad, shutdown and synchronization interface support, and robust short-circuit foldback protection under low-VOUT conditions.
Technical Context
The LT3430EFE#TRPBF implements constant-frequency current-mode control using an internal oscillator, error amplifier (2000 µmho transconductance), and peak-current comparator referenced to the VC pin. Its architecture maintains stable 3A peak switch current across full duty cycle range via patented circuitry (US Patent #6498466), enabling reliable operation even at high VIN/VOUT ratios.
It supports external synchronization (228–700 kHz), uses BOOST pin voltage to saturate the internal NPN switch, and provides dual-threshold shutdown (0.4V full shutdown, 2.38V UVLO). Bias supply can be sourced from VOUT ≥3V to improve efficiency at high input voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - enables direct battery or industrial bus connection without pre-regulation |
| Switch Current Limit | 3A over full duty cycle - sustains peak load delivery without derating at high duty cycles |
| Switching Frequency | 200kHz (fixed) - balances EMI, size, and efficiency for mid-power applications |
| Feedback Reference | 1.22V ±15mV - sets output voltage precisely with standard resistor dividers |
| Shutdown Current | 30µA - minimizes system standby power consumption |
| Switch RON | 0.1Ω typical - reduces conduction loss and thermal stress at 2A load |
| Junction Temp Range | –40°C to 125°C - qualified for under-hood automotive and industrial environments |
Pinout & Package
LT3430EFE#TRPBF is housed in a thermally enhanced 16-pin plastic TSSOP package with exposed GND pad (Pin 17), requiring soldering to PCB ground plane for thermal management (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16, 17) | Power and signal reference ground | Multiple connections reduce ground impedance; exposed pad (Pin 17) must be soldered to PCB ground for thermal dissipation |
| SW (Pins 2, 5) | Emitter of internal NPN power switch | High dI/dt node - requires short, low-inductance path to catch diode and inductor |
| VIN (Pins 3, 4) | Collector of internal NPN switch + bias source | Primary input power path; powers internal circuitry when BIAS pin is unconnected |
| BOOST (Pin 6) | Switch driver boost supply | Must be driven ~5V above VIN via external capacitor/diode to saturate NPN switch and minimize VCE(sat) |
| BIAS (Pin 10) | Efficiency-optimized bias supply input | Connect to regulated VOUT ≥3V to shift internal bias current from VIN, improving light-load efficiency |
| VC (Pin 11) | Error amplifier output / current limit setpoint | Used for loop compensation; clamps between 0.9V (light load) and 2.1V (full load); drives current limit comparator |
| FB (Pin 12) | Output voltage sensing input | 1.22V reference - sets VOUT via resistor divider; also triggers frequency/current foldback below 0.8V/0.6V |
| SYNC (Pin 14) | External oscillator synchronization input | Logic-level compatible (10–90% duty); accepts 228–700kHz external clock for EMI reduction or multi-phase sync |
| SHDN (Pin 15) | Enable/disable control with UVLO | 2.38V threshold enables UVLO; 0.4V threshold forces micropower shutdown (30µA IQ) |
Key Features
| Feature | Design Value |
|---|---|
| Patented peak-current maintenance | Maintains 3A switch current limit across entire duty cycle range - eliminates high-duty-cycle current derating common in current-mode controllers |
| Boost-driven NPN saturation | Uses external BOOST capacitor to drive switch base >VIN, achieving 0.1Ω effective RON and minimizing conduction loss |
| Dual-threshold shutdown | 2.38V UVLO prevents startup until input reaches safe level; 0.4V deep shutdown reduces IQ to 30µA for battery-powered systems |
| Integrated frequency & current foldback | Automatically reduces switching frequency (5:1) and peak current limit when FB < 0.8V/<0.6V - limits power dissipation during short-circuit faults |
| Thermally enhanced TSSOP-16 | Exposed GND pad (Pin 17) lowers θJA to 45°C/W - enables 2A continuous operation without heatsink in standard PCB layouts |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: 24V truck battery powering 5V microcontroller, CAN transceiver, and sensors in cab electronics. IC Role / Device Role / Timing Role: Primary step-down regulator converting 9–36V battery range to stable 5V rail. Use Value: 60V absolute max rating and –40°C to 125°C operation ensure reliability across cold cranking and load dump transients. | Use Scenario: Distributed 12V-to-5V conversion for door module MCU, window motor drivers, and LED status indicators. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter on space-constrained PCB near actuators. Use Value: TSSOP-16 package with exposed pad enables thermal performance matching larger SOIC solutions in tight enclosures. |
| Portable Test Equipment | Telecom Remote Radio Unit |
Use Scenario: Battery-powered handheld multimeter requiring clean 5V supply from 2S Li-ion (6–8.4V) or 9V alkaline. IC Role / Device Role / Timing Role: Main DC/DC regulator supporting analog front-end, display, and BLE radio. Use Value: 30µA shutdown current extends battery life; 200kHz fixed frequency simplifies EMI filtering design. | Use Scenario: Outdoor macrocell remote radio unit powered by -48V telecom supply, needing isolated 5V for digital control logic. IC Role / Device Role / Timing Role: Pre-regulator stepping -48V down to intermediate 12V or 5V before point-of-load converters. Use Value: 60V input rating accommodates telecom surge standards; SYNC pin allows phase alignment with other converters to reduce input ripple. |
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#PBF | 40V max input, 2.5A switch, 3mm × 4mm MSOP-10, 1MHz switching | Better suited for compact, high-frequency designs where board area is constrained and input ≤40V | Select LTC3630EMSE#PBF when higher frequency (1MHz) and smaller footprint are prioritized over 60V input capability |
| LM5164QPWPRQ1 | 65V max input, 0.5A integrated FET, 1.5MHz, automotive AEC-Q100 Grade 1 | Lower current rating but AEC-Q100 qualified; includes integrated high-side FET and bootstrap circuit | Select LM5164QPWPRQ1 for automotive applications requiring AEC-Q100 qualification and simplified layout with integrated high-side switch |
Compared with LTC3630EMSE#PBF and LM5164QPWPRQ1, LT3430EFE#TRPBF uniquely combines 60V input tolerance, 3A switch current, and fixed 200kHz operation in a thermally optimized TSSOP package-making it optimal for industrial 24/48V systems demanding robustness and thermal headroom without AEC-Q100 certification.
Availability
LT3430EFE#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and portable test equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3430EFE#TRPBF 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 analog and power management product lines with rigorous industrial and automotive qualification standards.
The LT3430 series belongs to Linear's high-voltage monolithic buck regulator family, engineered specifically for rugged 24V/48V industrial and automotive power conversion where input transients, thermal constraints, and reliability under extended temperature operation are critical.
FAQ
What is the maximum input voltage rating for the LT3430EFE#TRPBF?
The LT3430EFE#TRPBF 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 bus systems, as well as automotive battery inputs subject to load dump transients. Operation beyond 60V risks permanent device damage per Absolute Maximum Ratings.
Does the LT3430EFE#TRPBF require an external catch diode?
Yes, the LT3430EFE#TRPBF requires an external catch diode connected from SW to GND. It integrates only the NPN power switch (collector at VIN, emitter at SW); the diode provides the freewheeling path during switch-off. A Schottky diode such as MMSD914TI (as shown in the typical application) is recommended to minimize forward voltage drop and improve efficiency.
How does the BOOST pin function in the LT3430EFE#TRPBF?
The BOOST pin on the LT3430EFE#TRPBF supplies elevated base drive to the internal NPN power switch. It must be biased ~5V above VIN using an external capacitor and diode (e.g., 220pF + MMSD914TI). This ensures full saturation of the switch, reducing VCE(sat) and achieving the specified 0.1Ω typical on-resistance - critical for maintaining efficiency at high input voltages.
Can the LT3430EFE#TRPBF be synchronized to an external clock?
Yes, the LT3430EFE#TRPBF supports external synchronization via the SYNC pin. It accepts logic-level signals (10–90% duty cycle) within 228kHz to 700kHz. Synchronization enables EMI reduction through frequency dithering or phase alignment in multi-converter systems - a feature confirmed in the Electrical Characteristics table and Pin Functions section of the datasheet.
What happens to the LT3430EFE#TRPBF during output short-circuit conditions?
During output short-circuit, the LT3430EFE#TRPBF activates built-in protection: FB voltage drops below 0.8V, triggering frequency foldback (~5:1 reduction), and below 0.6V, reducing peak switch current limit. These actions limit power dissipation in the IC, external diode, and inductor. The behavior is documented in the Applications Information section and verified in Typical Performance Characteristics (Figures G09, G11).
LT3430EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3430EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3430EFE#TRPBF 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#TRPBF reliable?
The price and inventory of LT3430EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3430EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3430EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3430EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3430EFE#TRPBF?
LT3430EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3430EFE#TRPBF 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#TRPBF?
For technical support, including LT3430EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3430EFE#TRPBF requirements.
6.How does Aetrix verify that LT3430EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3430EFE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3430EFE#TRPBF?
All LT3430EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3430EFE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT3430EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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