My Inquiry
My Account
Analog Devices Inc. LT3430IFE-1#TRPBF
- Part No.:
- LT3430IFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3430IFE-1#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,873
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3430IFE-1#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, features 100kHz fixed switching frequency, 0.1Ω internal NPN switch, and 1.22V feedback reference-enabling robust 5V/2A buck converter designs in distributed power systems.
For engineers reviewing the LT3430IFE-1#TRPBF datasheet, LT3430IFE-1#TRPBF pinout, LT3430IFE-1#TRPBF application, or LT3430IFE-1#TRPBF equivalent, key selection criteria include its 100kHz operation (LT3430-1 variant), –40°C to 125°C industrial temperature rating, thermally enhanced 16-pin TSSOP package with exposed GND pad, and integrated cycle-by-cycle current limiting for short-circuit protection.
Technical Context
The LT3430IFE-1#TRPBF implements a constant-frequency, current-mode control architecture with dual feedback loops: an error amplifier sets the peak switch current threshold, while a current-sense amplifier monitors switch current on a cycle-by-cycle basis. Its internal 2.9V bias regulator draws power from VIN or optionally from the BIAS pin when connected to ≥3V output voltage-improving efficiency at high input-to-output voltage ratios.
Patented circuitry maintains 3A peak switch current across the full duty cycle range (up to 96% for LT3430-1), eliminating typical current-limit roll-off above 50%. The BOOST pin enables saturation of the internal NPN switch via an external capacitor-diode network, reducing conduction loss to that of a 0.1Ω FET structure-critical for high-efficiency operation at 60V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports wide-range industrial and battery-fed inputs without pre-regulation |
| Switching Frequency | 100kHz (LT3430-1) - fixed frequency simplifies EMI filtering and enables predictable thermal behavior |
| Peak Switch Current | 3A over full duty cycle - maintains regulation under heavy load and high VIN/VOUT ratios without current-limit degradation |
| Internal Switch RON | 0.1Ω - low conduction loss enables >90% efficiency at 5V/2A output from 12V–42V input |
| Feedback Reference | 1.22V ±1.2% - precise reference enables accurate output voltage setting with standard resistor dividers |
| Shutdown Current | 30µA - ultra-low quiescent draw supports always-on systems and battery backup operation |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood automotive and harsh industrial environments |
| Package | 16-pin thermally enhanced TSSOP with exposed GND pad - θJA = 45°C/W enables 2A continuous operation without heatsink |
Pinout & Package
The LT3430IFE-1#TRPBF is housed in a 16-pin plastic TSSOP package (FE grade) with an exposed thermal pad (Pin 17) fused to GND. The package requires soldering the exposed pad to a PCB ground plane for optimal thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16, 17) | Power and signal reference ground | Multiple GND pins minimize ground bounce; exposed pad (Pin 17) must be soldered to PCB ground plane for thermal management |
| SW (Pins 2, 5) | Emitter of internal NPN power switch | High dI/dt node requiring short, low-inductance routing to inductor and catch diode |
| VIN (Pins 3, 4) | Collector of internal NPN switch & primary power input | Supplies internal bias circuitry; requires local high-frequency bypass capacitor |
| BOOST (Pin 6) | Boost drive voltage input | Connects to external capacitor-diode network to saturate NPN switch and achieve 0.1Ω effective RON |
| BIAS (Pin 10) | External bias supply input | When tied to regulated output (≥3V), shifts internal bias current from VIN to VOUT-boosting efficiency at high input voltages |
| VC (Pin 11) | Error amplifier output / current limit comparator input | Used for loop compensation; clamps between 0.9V (light load) and 2.1V (full load); can override current limit |
| FB (Pin 12) | Feedback input | Senses 1.22V reference; also enables frequency foldback (<0.8V) and current limit reduction (<0.6V) during fault conditions |
| SYNC (Pin 14) | External oscillator synchronization input | Logic-level compatible; accepts 125kHz–250kHz external clock for EMI reduction or system timing alignment |
| SHDN (Pin 15) | Shutdown control | Two-threshold UVLO: 2.38V disables switching (lockout), 0.4V forces micropower shutdown (30µA IQ) |
Key Features
| Feature | Design Value |
|---|---|
| Patented constant peak switch current | Maintains 3A limit across 0–96% duty cycle-eliminates need for derating at high VIN/VOUT ratios |
| BOOST pin architecture | Enables NPN saturation via external boost capacitor, achieving FET-like 0.1Ω RON and <1.5V VCE(sat) |
| Frequency and current foldback | Reduces switching frequency (5:1) and peak current (<2A) below 0.8V FB voltage-limiting power dissipation during short-circuit faults |
| Thermally enhanced TSSOP | 16-pin package with exposed GND pad achieves θJA = 45°C/W-supports 2A continuous output without heatsink |
| Dual-threshold SHDN pin | 2.38V lockout prevents startup until input reaches safe level; 0.4V deep shutdown reduces IQ to 30µA |
Applications
| Industrial Power Supply | Automotive DC-DC Conversion |
|---|---|
Use Scenario: 24V truck battery powering 5V microcontroller and CAN transceiver in engine control unit. IC Role / Device Role / Timing Role: Primary buck regulator converting 9V–36V battery range to stable 5V rail with high PSRR and transient immunity. Use Value: 100kHz fixed frequency avoids AM radio band; 125°C junction rating ensures reliability under hood; SYNC pin allows synchronization to vehicle clock domain. | Use Scenario: 48V mild-hybrid vehicle subsystem supplying 5V to infotainment display and sensors. IC Role / Device Role / Timing Role: High-input-voltage buck controller delivering 2A at 5V with input transient tolerance up to 60V. Use Value: 60V absolute max input withstands load-dump transients; BIAS pin improves efficiency at 48V→5V conversion; exposed pad ensures thermal stability at elevated ambient temperatures. |
| Portable Computer Adapter | Distributed Telecom Power |
Use Scenario: Universal AC adapter (12V–24V DC input) powering 5V USB-C PD sink circuitry in ruggedized laptop. IC Role / Device Role / Timing Role: Secondary-side buck regulator providing isolated 5V rail with tight line/load regulation and fast transient response. Use Value: Current-mode control delivers <10µs transient recovery; 3A switch headroom supports 2A sustained + 1A peak loads; 16-pin TSSOP fits compact layout. | Use Scenario: Intermediate bus converter in 48V telecom shelf supplying 5V to FPGA and SerDes interfaces. IC Role / Device Role / Timing Role: Point-of-load regulator accepting 36V–60V intermediate bus and delivering tightly regulated 5V/2A. Use Value: 100kHz operation enables small, standardized filter inductors; frequency foldback protects downstream logic during hot-swap events; GND pin multiplicity minimizes ground noise coupling. |
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 | 40V max input, 3.3V/1.5A fixed output, 3mm × 4mm MSOP package, no SYNC or BOOST pin | Lower voltage, lower current, fixed-output variant-suitable only for ≤40V, ≤1.5A applications where board space is critical | Select if input ≤40V and fixed 3.3V output suffices; avoid for 60V or adjustable outputs |
| LM5164QPWPRQ1 | 65V max input, 100kHz sync capability, integrated MOSFETs, 1.5A output, SOIC-14 package | Higher input rating but lower current (1.5A vs 2A); uses external compensation; lacks BOOST architecture for NPN saturation | Choose for AEC-Q100 automotive qualification and integrated FETs; accept reduced peak current and higher RDS(on) losses |
Compared with LTC3630EMSE-5#PBF and LM5164QPWPRQ1, the LT3430IFE-1#TRPBF uniquely combines 60V input, 3A switch, BOOST-enabled NPN saturation, and 100kHz fixed frequency in a thermally optimized TSSOP-making it the only option supporting 5V/2A from 60V input with industrial temperature range and fault-foldback protection.
Availability
LT3430IFE-1#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC converters, and distributed telecom power systems requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +125°C.
Supply support for LT3430IFE-1#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 LT3430/LT3430-1 product line was engineered specifically for high-input-voltage industrial and automotive buck conversion-emphasizing robustness, thermal efficiency, and fault resilience in harsh environments.
FAQ
What is the maximum input voltage supported by the LT3430IFE-1#TRPBF?
The LT3430IFE-1#TRPBF supports an absolute maximum input voltage of 60V on the VIN pin, with guaranteed operation from 5.5V to 60V. This wide input range enables use in 24V and 48V industrial systems, automotive battery rails, and telecom intermediate buses. Operation above 60V risks permanent damage per Absolute Maximum Ratings.
How does the BOOST pin function in the LT3430IFE-1#TRPBF?
The BOOST pin on the LT3430IFE-1#TRPBF provides a drive voltage higher than VIN to saturate the internal NPN power switch. Connected via an external capacitor and diode to SW, it elevates the base drive voltage-reducing VCE(sat) to achieve an effective on-resistance of 0.1Ω. This architecture is essential for maintaining high efficiency at high input voltages and is explicitly required for full 3A switch current capability.
Does the LT3430IFE-1#TRPBF support external frequency synchronization?
Yes, the LT3430IFE-1#TRPBF supports external synchronization via its SYNC pin, which accepts logic-level signals from 125kHz to 250kHz. This allows EMI reduction through frequency dithering or alignment with system clocks. Unlike the LT3430 (228–700kHz), the LT3430-1 variant-including LT3430IFE-1#TRPBF-is specifically rated for the 125–250kHz range, matching common industrial timing sources.
What is the purpose of the dual-threshold SHDN pin on the LT3430IFE-1#TRPBF?
The SHDN pin on the LT3430IFE-1#TRPBF has two distinct thresholds: 2.38V initiates undervoltage lockout (UVLO), disabling switching until input stabilizes; 0.4V triggers deep micropower shutdown, reducing supply current to 30µA. This dual functionality enables both input supervision and battery-saving modes-critical for always-on automotive modules and portable equipment with standby requirements.
Can the LT3430IFE-1#TRPBF operate with input voltages below 7.5V?
The LT3430IFE-1#TRPBF is specified for operation down to 5.5V, but some restrictions apply below 7.5V per the datasheet. At low input, BOOST pin functionality may be compromised, limiting peak switch current and efficiency. For reliable operation near minimum VIN, ensure proper BOOST capacitor sizing and verify startup behavior under worst-case load and temperature conditions using the LT3430IFE-1#TRPBF's lockout threshold (2.38V) and minimum input voltage curves.
LT3430IFE-1#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):
- 58.8V
- Current - Output:
- 3A
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3430IFE-1#TRPBF FAQ
1.How can I place an order for LT3430IFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3430IFE-1#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-1#TRPBF reliable?
The price and inventory of LT3430IFE-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3430IFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3430IFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3430IFE-1#TRPBF?
LT3430IFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3430IFE-1#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-1#TRPBF?
For technical support, including LT3430IFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3430IFE-1#TRPBF requirements.
6.How does Aetrix verify that LT3430IFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3430IFE-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3430IFE-1#TRPBF?
All LT3430IFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3430IFE-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3430IFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3430IFE-1#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
