My Inquiry
My Account
Analog Devices Inc. LT3430EFE-1#TRPBF
- Part No.:
- LT3430EFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3430EFE-1#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,398
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3430EFE-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode synchronous step-down DC/DC converter IC designed for industrial and automotive power supplies. It accepts 5.5V–60V input, delivers up to 2A output at 5V, integrates a 0.1Ω NPN power switch, operates at fixed 100kHz switching frequency, and features cycle-by-cycle current limiting and 1.22V feedback reference.
For engineers reviewing the LT3430EFE-1#TRPBF datasheet, LT3430EFE-1#TRPBF pinout, LT3430EFE-1#TRPBF application, or LT3430EFE-1#TRPBF equivalent, key selection criteria include its 100kHz fixed-frequency operation (vs. 200kHz for LT3430), 125–250kHz external synchronization range, –40°C to 125°C junction temperature rating, thermally enhanced 16-pin TSSOP package with exposed GND pad, and integrated UVLO/shutdown thresholds at 2.38V and 0.4V.
Technical Context
The LT3430EFE-1#TRPBF implements a constant-frequency, current-mode buck architecture with dual feedback loops: an error amplifier sets the peak switch current threshold, while a current-sense amplifier monitors inductor current on a cycle-by-cycle basis. Its internal 2.9V bias regulator draws power from VIN unless BIAS pin is connected to ≥3V output voltage-enabling higher efficiency at elevated input-to-output voltage ratios.
Patented circuitry maintains 3A peak switch current across full duty cycle range (up to 96% max), eliminating typical current-limit rolloff above 50%. Frequency foldback activates below 0.8V FB voltage (reducing fSW ~3:1), and current limit folds below 0.6V FB, both enhancing short-circuit survivability without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports wide-range industrial inputs including 24V, 36V, and 48V bus systems |
| Switching Frequency | 100kHz (fixed) - enables use of lower-cost, higher-inductance chokes (e.g., 68µH) vs. 200kHz variant |
| Peak Switch Current | 3A over full duty cycle - sustains full current capability even at high VOUT/VIN ratios |
| Internal Switch RON | 0.1Ω - minimizes conduction loss; typical VCE(sat) ≈ 300mV at 2.5A |
| Feedback Reference | 1.22V ±1.2% - sets output voltage via external resistor divider; low drift ensures stable regulation |
| Shutdown Current | 30µA - enables ultra-low-power standby in battery-backed or energy-sensitive systems |
| SYNC Range | 125kHz to 250kHz - allows noise-sensitive system-level clock alignment without jitter injection |
| Junction Temp Range | –40°C to 125°C - qualified for under-hood automotive and industrial ambient environments |
Pinout & Package
The LT3430EFE-1#TRPBF is housed in a 16-pin thermally enhanced TSSOP package (FE) with exposed GND pad (Pin 17) that must be soldered to PCB ground plane for thermal integrity (θJC = 10°C/W). Pin count and layout match LT3430EFE but differ in SYNC and fSW specifications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16, 17) | Power and signal reference ground | Multiple pins + exposed pad reduce ground impedance; critical for load regulation and thermal dissipation |
| SW (2, 5) | Emitter of internal NPN power switch | Drives inductor; clamped externally by catch diode; negative swing ≤ –0.8V allowed |
| VIN (3, 4) | Collector of internal NPN switch + primary supply | Supplies control circuitry; high dI/dt path requires short loop to input capacitor and catch diode |
| BOOST (6) | Charge-pump drive voltage source | Enables switch saturation via external capacitor/diode; reduces effective RON to ~0.1Ω |
| SHDN (15) | Undervoltage lockout and shutdown control | 2.38V threshold enables precise input UVLO; 0.4V forces micropower shutdown (30µA) |
| SYNC (14) | External oscillator synchronization input | Logic-compatible; 125–250kHz range avoids EMI bands while enabling deterministic timing |
| FB (12) | Output voltage sensing and protection node | Sets VOUT via 1.22V reference; also triggers frequency foldback (<0.8V) and current foldback (<0.6V) |
| VC (11) | Error amplifier output / current limit comparator input | Compensation node; 0.9V–2.1V swing reflects load; can override loop or clamp for current limiting |
| BIAS (10) | Efficiency-boosting auxiliary supply input | Connect to regulated output ≥3V to shift bias current from VIN → VOUT, improving light-load efficiency |
Key Features
| Feature | Design Value |
|---|---|
| Patented peak-current maintenance | Maintains 3A switch current limit across 0–96% duty cycle-no derating at high VOUT/VIN |
| Integrated UVLO + shutdown | Dual-threshold SHDN pin (2.38V lockout / 0.4V deep shutdown) eliminates need for external supervisor IC |
| Frequency and current foldback | Automatically reduces fSW (~3:1) and peak current during startup or short-circuit-limits power dissipation without external circuitry |
| BOOST-driven saturation | External BOOST capacitor/diode enables bipolar NPN switch to behave like low-RON FET (0.1Ω) |
| Thermally enhanced TSSOP | 16-pin FE package with exposed GND pad achieves θJC = 10°C/W-supports >2A continuous output at 125°C ambient |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: 24V truck battery powers 5V microcontroller, CAN transceiver, and sensor interface in cab electronics. IC Role / Device Role / Timing Role: Primary 5V/2A buck regulator; provides clean, regulated rail with UVLO tracking battery sag. Use Value: 60V absolute max input withstands load-dump transients; 100kHz operation simplifies EMI filtering vs. higher-frequency alternatives. | Use Scenario: Under-hood engine control unit requiring robust 3.3V or 5V rail from 12V battery with cold-crank immunity. IC Role / Device Role / Timing Role: High-reliability step-down converter with –40°C to 125°C operation and thermal shutdown protection. Use Value: Dual SHDN thresholds prevent brownout resets during cranking (2.38V UVLO) and enable zero-power sleep mode (0.4V shutdown). |
| Portable Medical Instrument | Distributed Telecom Power |
Use Scenario: Battery-powered ultrasound device needs isolated 5V rail from 12–28V Li-ion pack with minimal heat generation. IC Role / Device Role / Timing Role: Main DC/DC converter; uses BIAS pin connection to output to improve light-load efficiency. Use Value: 0.1Ω switch RON and BOOST-assisted saturation minimize conduction loss; 30µA shutdown extends battery life between measurements. | Use Scenario: 48V intermediate bus in telecom shelf supplies 5V/2A to FPGA I/O banks and memory interfaces. IC Role / Device Role / Timing Role: Point-of-load regulator synchronized to system clock via SYNC pin to suppress beat frequencies. Use Value: 125–250kHz SYNC range aligns with common telecom timing standards; current-mode control ensures fast transient response to bursty FPGA loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE-1#PBF | 40V max input, 1.5A output, 3mm × 4mm MSOP; no BOOST pin; uses MOSFET switch | Lower voltage/current rating; lacks high-VIN ruggedness and foldback protection | Choose for space-constrained, lower-power designs where 60V tolerance and fault resilience are unnecessary |
| LM5164QPWPRQ1 | 65V max input, 300mA output, 100kHz fixed freq, integrated MOSFET; AEC-Q100 qualified | Lower output current; no VC pin for loop compensation; different thermal profile | Prefer for automotive ASIL-B systems needing qualification-but insufficient for 2A loads without paralleling |
Compared with LTC3630EMSE-1#PBF and LM5164QPWPRQ1, the LT3430EFE-1#TRPBF uniquely combines 60V input, 3A switch, 100kHz fixed frequency, full-duty-cycle current limit, and dual-threshold shutdown in a single monolithic IC-making it optimal for high-reliability 2A industrial and automotive buck applications where input transients and thermal stress are dominant concerns.
Availability
LT3430EFE-1#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and portable medical instrumentation requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3430EFE-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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio. The company specializes in precision signal chain and power solutions for demanding industrial, automotive, and aerospace applications.
The LT3430/LT3430-1 product line was designed specifically for high-input-voltage, high-reliability DC/DC conversion in harsh environments-emphasizing wide VIN range, thermal robustness, and intrinsic fault protection without external components.
FAQ
What is the maximum input voltage rating for the LT3430EFE-1#TRPBF?
The LT3430EFE-1#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin. This allows reliable operation across 24V, 36V, and 48V industrial and automotive bus systems-even during load-dump transients. Operation above 60V risks permanent damage per Absolute Maximum Ratings. The LT3430EFE-1#TRPBF is rated for continuous operation from 5.5V to 60V, with minimum start-up voltage dependent on output voltage and load (e.g., ~7.5V for 5V output).
How does the LT3430EFE-1#TRPBF differ from the LT3430EFE#TRPBF?
The LT3430EFE-1#TRPBF operates at a fixed 100kHz switching frequency with 125–250kHz external synchronization range, whereas the LT3430EFE#TRPBF runs at 200kHz with 228–700kHz SYNC capability. Both share identical pinout, package, and core features-including 60V input, 3A switch, BOOST pin, and dual-threshold SHDN-but the -1 suffix denotes the lower-frequency variant optimized for higher-inductance, lower-EMI designs.
What is the purpose of the BOOST pin on the LT3430EFE-1#TRPBF?
The BOOST pin on the LT3430EFE-1#TRPBF supplies a voltage higher than VIN to the base drive of the internal NPN power switch, enabling full saturation and minimizing VCE(sat). An external diode and capacitor form a charge pump that lifts BOOST above VIN, reducing effective switch resistance to 0.1Ω and improving efficiency-especially at high input voltages. Without BOOST, VCE(sat) would rise to ~1.5V, degrading thermal performance.
Can the LT3430EFE-1#TRPBF be used without connecting the BIAS pin?
Yes, the LT3430EFE-1#TRPBF functions normally with the BIAS pin left open or tied to VIN. In this configuration, internal bias circuitry draws power from VIN. However, connecting BIAS to the regulated output (≥3V) shifts most bias current from VIN to VOUT-improving efficiency at high VIN/VOUT ratios (e.g., 48V→5V). Leaving BIAS unconnected does not impair regulation but forfeits this efficiency gain.
What protection features are built into the LT3430EFE-1#TRPBF?
The LT3430EFE-1#TRPBF integrates multiple hardware-based protections: cycle-by-cycle current limiting, thermal shutdown (via internal sensor), undervoltage lockout (2.38V SHDN threshold), deep micropower shutdown (0.4V SHDN threshold), frequency foldback (<0.8V FB), and current foldback (<0.6V FB). These operate autonomously without external components-enhancing reliability in overload, short-circuit, and cold-crank conditions.
LT3430EFE-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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3430EFE-1#TRPBF FAQ
1.How can I place an order for LT3430EFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3430EFE-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 LT3430EFE-1#TRPBF reliable?
The price and inventory of LT3430EFE-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 LT3430EFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3430EFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3430EFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3430EFE-1#TRPBF?
LT3430EFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3430EFE-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 LT3430EFE-1#TRPBF?
For technical support, including LT3430EFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3430EFE-1#TRPBF requirements.
6.How does Aetrix verify that LT3430EFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3430EFE-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 LT3430EFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3430EFE-1#TRPBF?
All LT3430EFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3430EFE-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 LT3430EFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3430EFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3430EFE-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…
