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Analog Devices Inc. LT3430IFE#TRPBF
- Part No.:
- LT3430IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3430IFE#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,683
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Product details
Overview
LT3430IFE#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 0.1Ω/3A 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 LT3430IFE#TRPBF datasheet, LT3430IFE#TRPBF pinout, LT3430IFE#TRPBF application, or LT3430IFE#TRPBF 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 guaranteed operation from –40°C to 125°C junction temperature.
Technical Context
The LT3430IFE#TRPBF implements a constant-frequency current-mode control architecture with internal oscillator, error amplifier (gm = 2000 µmho), and peak-current comparator. Its BOOST pin enables saturation of the integrated 0.1Ω NPN switch via external capacitor/diode, reducing conduction loss versus standard bipolar designs.
It features dual-threshold shutdown (0.4V full micropower, 2.38V UVLO), FB pin–driven frequency foldback below 0.8V and current limit reduction below 0.6V, and VC pin clamping (0.9V–2.1V range) for loop compensation or override - all supporting robust short-circuit protection without external circuitry.
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 while balancing EMI and efficiency trade-offs. |
| 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 - reduces conduction loss and thermal stress under 2A load conditions. |
| Feedback Reference | 1.22V ±1.2% - sets output voltage precisely using external resistor divider; low bias current (<1.5µA) minimizes divider error. |
| Shutdown Current | 30µA - enables ultra-low-power standby in battery-powered systems. |
| Operating Temperature | –40°C to +125°C (junction) - qualified for under-hood automotive and harsh industrial environments. |
| Package Thermal Resistance | θJA = 45°C/W, θJC = 10°C/W - exposed pad (Pin 17) must be soldered to PCB ground plane for thermal reliability. |
Pinout & Package
The LT3430IFE#TRPBF is housed in a 16-lead plastic TSSOP package with exposed GND pad (Pin 17), requiring soldering to PCB copper for thermal management. 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 reduce ground impedance; critical for load regulation and thermal dissipation. |
| SW (Pins 2, 5) | Emitter of internal NPN power switch | Connects to inductor and catch diode anode; handles high dI/dt; negative swing clamped externally. |
| VIN (Pins 3, 4) | Collector of internal NPN power switch | Primary input supply path; powers internal circuitry when BIAS pin is unconnected. |
| BOOST (Pin 6) | Switch driver voltage boost node | Connected to external capacitor/diode to generate >VIN voltage, enabling NPN saturation and minimizing VCE(sat). |
| BIAS (Pin 10) | Efficiency-optimized bias supply input | When tied to regulated output (≥3V), shifts internal bias current from VIN to VOUT, improving efficiency at high input-to-output ratios. |
| VC (Pin 11) | Error amplifier output / current limit setpoint | Used for loop compensation; voltage ranges from ~0.9V (light load) to 2.1V (full load); can be clamped or driven externally. |
| FB (Pin 12) | Output voltage sense and protection input | Sets output via 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 228kHz–700kHz signals to eliminate beat frequencies in multi-rail systems. |
| SHDN (Pin 15) | Enable/disable control with UVLO | Two thresholds: 2.38V disables switching (UVLO), 0.4V forces micropower shutdown (30µA IQ). |
| NC (Pins 7, 13) | No connection | Not internally bonded; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Patented constant peak switch current | Maintains 3A current limit across full 0–96% duty cycle - eliminates duty-cycle–dependent current derating. |
| Integrated BOOST drive circuitry | Enables NPN switch saturation using external capacitor/diode, achieving FET-like 0.1Ω RON performance. |
| FB pin–based protection functions | Automatically reduces switching frequency and peak current during low-VOUT faults - limits power dissipation without external components. |
| Thermally enhanced TSSOP-16 with exposed pad | θJC = 10°C/W enables 2A continuous operation at 125°C ambient with proper PCB layout. |
| Wide-input, high-temp grade | Rated for –40°C to +125°C junction temperature and 60V absolute max input - suitable for automotive engine compartments. |
Applications
| Industrial Power Supply | Automotive Battery Charger |
|---|---|
Use Scenario: 24V/48V DC input converted to 5V/3.3V for PLC I/O modules and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 2A output with high line regulation and transient immunity. Use Value: 60V input rating tolerates 48V rail transients; 200kHz switching allows small 22µH inductor; 30µA shutdown supports remote wake-up capability. | Use Scenario: On-board charging of 12V lead-acid or LiFePO4 auxiliary batteries from vehicle alternator (up to 60V during load dump). IC Role / Device Role / Timing Role: Constant-current/constant-voltage (CC/CV) controller front-end, regulating bulk charge current before battery management IC handoff. Use Value: Input overvoltage tolerance eliminates need for TVS clamping; frequency foldback prevents thermal runaway during battery short-circuit test. |
| Portable Computer Adapter | Distributed Telecom Power |
Use Scenario: Secondary-side 19V-to-5V conversion in laptop AC/DC adapters where space and thermal density are constrained. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter operating from 12–24V intermediate rail. Use Value: BIAS pin connection to 5V output improves efficiency by >3% at 19V input; exposed pad enables direct thermal coupling to heatsink layer. | Use Scenario: Point-of-load (POL) conversion in 48V telecom shelves powering FPGA, ASIC, or DSP cores requiring tightly regulated 1.2V/3A rails. IC Role / Device Role / Timing Role: Pre-regulator stepping 48V down to 5V/2A before downstream low-dropout regulators. Use Value: SYNC pin allows synchronization to system clock to avoid interference with high-speed serial links; 1.22V reference ensures <±1% output accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE#PBF | 40V max input, 1.5A output, 3mm × 4mm MSOP-10, no BOOST pin, uses MOSFET switch | Better suited for lower-input, space-constrained designs; lacks 60V rating and NPN saturation architecture | Select when input ≤40V and board area is premium; not drop-in due to different pinout and control scheme |
| LM5164QPWPRQ1 | 100V max input, 0.6A output, 1.5MHz switching, integrated MOSFET, AEC-Q100 Grade 1 | Higher voltage, lower current, higher frequency - targets infotainment vs. powertrain use cases | Choose for 100V automotive systems needing AEC-Q100 compliance; requires redesign for 2A loads |
Compared with LTC3630EMSE#PBF and LM5164QPWPRQ1, the LT3430IFE#TRPBF uniquely combines 60V input, 3A switch, 200kHz fixed frequency, and BOOST-enabled NPN saturation in a thermally optimized TSSOP - making it optimal for industrial 24/48V-to-5V conversion where efficiency, fault robustness, and thermal margin are prioritized over ultra-small footprint or 100V tolerance.
Availability
LT3430IFE#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery chargers, and distributed telecom power systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3430IFE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3430IFE#TRPBF belongs to Linear's high-voltage monolithic buck regulator product line, engineered specifically for rugged industrial and automotive DC/DC conversion where input transients, thermal stress, and fault resilience are critical design constraints.
FAQ
What is the maximum input voltage rating for the LT3430IFE#TRPBF?
The LT3430IFE#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pins, with guaranteed operation across 5.5V to 60V. This makes it suitable for 48V industrial buses and automotive load-dump scenarios. Exceeding 60V risks permanent damage per Absolute Maximum Ratings. The LT3430IFE#TRPBF maintains regulation and protection functionality across this full range when used with appropriate external components like the BOOST capacitor and catch diode.
Does the LT3430IFE#TRPBF require an external BOOST capacitor, and why?
Yes, the LT3430IFE#TRPBF requires an external BOOST capacitor (and associated diode) connected between the BOOST and SW pins. This network generates a voltage higher than VIN to fully saturate the internal NPN power switch, reducing its effective on-resistance to 0.1Ω. Without it, VCE(sat) would rise significantly, degrading efficiency and thermal performance - especially at high load currents. The LT3430IFE#TRPBF datasheet specifies minimum BOOST voltage (1.8V) and current (75mA at 2.5A switch current) to ensure reliable operation.
How does the LT3430IFE#TRPBF handle short-circuit protection?
The LT3430IFE#TRPBF implements dual-stage short-circuit protection via its FB pin: when FB voltage drops below 0.8V, switching frequency folds back (~5:1 reduction); below 0.6V, peak switch current limit is reduced. This limits power dissipation in both the IC and external components during sustained faults. The LT3430IFE#TRPBF also disables external synchronization during foldback to prevent interference. These functions are fully integrated - no external circuitry is required to achieve robust short-circuit survival.
Can the LT3430IFE#TRPBF be synchronized to an external clock, and what is its range?
Yes, the LT3430IFE#TRPBF supports external synchronization via its SYNC pin, accepting logic-level (1.5V–7V) square-wave inputs with 10%–90% duty cycle. Its synchronization range is 228kHz to 700kHz - wider than the LT3430-1 variant. This allows noise-sensitive systems (e.g., RF modules or high-speed data converters) to align switching edges and avoid beat frequencies. The LT3430IFE#TRPBF maintains regulation and protection features during sync mode, with no impact on startup or fault response.
What is the purpose of the BIAS pin on the LT3430IFE#TRPBF?
The BIAS pin on the LT3430IFE#TRPBF allows the internal bias circuitry to draw operating current from the regulated output (≥3V) instead of the high-voltage input rail. When connected to VOUT, this reduces total input-referred quiescent current - improving efficiency by up to 3% at high input-to-output voltage ratios (e.g., 48V-to-5V). The LT3430IFE#TRPBF automatically switches bias sources based on BIAS pin voltage; no external control is needed. This feature is optional but recommended for efficiency-critical applications.
LT3430IFE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3430IFE#TRPBF FAQ
1.How can I place an order for LT3430IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3430IFE#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 LT3430IFE#TRPBF reliable?
The price and inventory of LT3430IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3430IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3430IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3430IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3430IFE#TRPBF?
LT3430IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3430IFE#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 LT3430IFE#TRPBF?
For technical support, including LT3430IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3430IFE#TRPBF requirements.
6.How does Aetrix verify that LT3430IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3430IFE#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 LT3430IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3430IFE#TRPBF?
All LT3430IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3430IFE#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 LT3430IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3430IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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