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Analog Devices Inc. LT3430IFE#PBF
- Part No.:
- LT3430IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3430IFE#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:144
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Product details
Overview
LT3430IFE#PBF 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 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 LT3430IFE#PBF datasheet, LT3430IFE#PBF pinout, LT3430IFE#PBF application, or LT3430IFE#PBF equivalent, this page provides verified technical context, thermal-aware package details, real-world efficiency behavior across load and input voltage, confirmed synchronization range (228–700kHz), and validated alternative options for high-input-voltage buck regulation.
Technical Context
The LT3430IFE#PBF implements constant-frequency current-mode control using an internal oscillator, error amplifier (gm = 2000 µmho), and peak-current comparator referenced to the VC pin. Its patented architecture maintains 3A peak switch current across the full duty cycle range (up to 93%), eliminating typical current-limit rolloff above 50% duty.
It uses a BOOST pin-driven external charge pump to saturate the on-chip NPN switch, achieving 0.1Ω on-resistance and high efficiency across wide VIN (5.5–60V) and IOUT (0–2A) ranges. Shutdown reduces supply current to 30µA, and SYNC enables external clocking from 228kHz to 700kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - supports direct connection to 24V/48V industrial buses and automotive battery rails without pre-regulation. |
| Switching Frequency | 200kHz (fixed) - enables compact magnetics while maintaining low EMI and high light-load efficiency. |
| Peak Switch Current | 3A over full duty cycle - sustains high output current even at low VOUT/VIN ratios (e.g., 5V from 42V). |
| Internal Switch RON | 0.1Ω - minimizes conduction loss; measured at ISW = 2.5A with BOOST = VIN + 5V. |
| Feedback Reference | 1.22V (typical) - sets output voltage via external resistor divider; ±1.5% tolerance over –40°C to 125°C. |
| Shutdown Current | 30µA (max) - enables ultra-low-power standby in battery-backed systems. |
| SYNC Range | 228kHz to 700kHz - allows noise-sensitive system-level clock alignment without requiring external PLL. |
| Junction Temp Range | –40°C to 125°C - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
The LT3430IFE#PBF is housed in a thermally enhanced 16-pin TSSOP package (FE) with exposed GND pad (Pin 17) that must be soldered to PCB ground plane for θJC = 10°C/W thermal performance.
| 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; clamped to –0.8V max during off-time. |
| VIN (Pins 3, 4) | Collector of internal NPN switch & primary bias source | Supplies internal circuitry when BIAS pin is unconnected; requires low-inductance path to input capacitor. |
| BOOST (Pin 6) | Charge-pump drive for switch saturation | Must be biased ≥VIN + 1.8V to ensure full switch saturation; external diode/capacitor required. |
| BIAS (Pin 10) | Secondary bias supply input | Connect to regulated output (≥3V) to improve efficiency at high VIN/light loads by sourcing bias current from VOUT. |
| VC (Pin 11) | Error amplifier output / current limit threshold | Used for loop compensation; also serves as current clamp point (0.9V–2.1V range); can override regulation. |
| FB (Pin 12) | Output voltage sensing input | 1.22V reference; enables foldback protection: frequency reduction below 0.8V, current limit reduction below 0.6V. |
| SYNC (Pin 14) | External clock synchronization input | Logic-compatible (10–90% duty); enables deterministic EMI management across multi-rail systems. |
| SHDN (Pin 15) | Enable/disable control with UVLO | Two thresholds: 2.38V (UVLO start-up), 0.4V (deep shutdown); draws only 5.5µA bias current when open. |
Key Features
| Feature | Design Value |
|---|---|
| Patented constant peak-current architecture | Maintains 3A switch current limit across 0–93% duty cycle - eliminates need for derating at high VIN/VOUT ratios. |
| Integrated BOOST-driven NPN switch | 0.1Ω on-resistance achieved via external boost capacitor - delivers FET-like efficiency with bipolar reliability. |
| Programmable frequency foldback | Reduces switching frequency ~5:1 when FB < 0.8V - limits power dissipation during short-circuit or start-up faults. |
| Dual-threshold SHDN pin | 2.38V UVLO + 0.4V micropower shutdown - enables precise input voltage sequencing and zero-quiescent standby. |
| Thermally enhanced TSSOP-16 | θJA = 45°C/W, θJC = 10°C/W - supports 2A continuous operation at 125°C junction temperature with proper PCB layout. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: 24V rail conversion to 5V/2A for PLC I/O modules operating in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V from unregulated 24V–40V input; handles load transients from solenoid actuation. Use Value: 200kHz fixed frequency avoids audible noise; 60V absolute max rating tolerates load-dump transients up to 58V per ISO 7637-2. |
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface in door module with cold-crank (4.5V) and load-dump (58V) conditions. IC Role / Device Role / Timing Role: Input-stage buck converter enabling single-rail 12V battery to 5V logic supply; synchronized to system clock via SYNC pin. Use Value: –40°C to 125°C qualification ensures operation during engine-off storage and under-hood hot-soak; 30µA shutdown current preserves battery life. |
| Portable Medical Equipment | Distributed Telecom Power |
|
Use Scenario: Battery-powered ultrasound device requiring 5V/2A from 2S–4S Li-ion pack (6–16.8V), with strict EMI limits near sensitive analog front-end. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator; SYNC pin locked to system master clock to eliminate beat frequencies. Use Value: 200kHz operation enables small 22µH inductor; BOOST-assisted switch achieves >92% efficiency at 12V→5V/2A, reducing thermal stress in sealed enclosure. |
Use Scenario: 48V backplane-to-point-of-load conversion for remote radio head (RRH) baseband board with space-constrained layout. IC Role / Device Role / Timing Role: Compact, high-VIN buck stage feeding downstream POL converters; leverages BIAS pin to draw bias from 12V intermediate rail. Use Value: 0.1Ω switch and current-mode control enable tight load regulation (<±1%) across 0–2A; TSSOP-16 footprint fits dense RF board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-input-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE#PBF | 40V max VIN, 1.5A output, 3mm × 4mm MSOP; no BOOST pin; uses MOSFET switch. | Better suited for space-constrained designs with VIN ≤ 40V; lacks high-VIN robustness and 3A capability of LT3430IFE#PBF. | Select when board area is critical and input voltage never exceeds 40V; avoid for 48V telecom or automotive load-dump scenarios. |
| LM5164QPWPRQ1 | 100V max VIN, 300mA output, SOIC-8; integrated MOSFET; spread-spectrum EMI reduction. | Higher voltage rating but lower current capacity; optimized for ultra-low Iq (14µA) and automotive AEC-Q100 Grade 1. | Select for 60–100V inputs with sub-500mA loads and stringent automotive qualification; not a functional replacement for 2A applications. |
Compared with LTC3630EMSE#PBF and LM5164QPWPRQ1, the LT3430IFE#PBF uniquely balances 60V input tolerance, 3A switch capability, and thermally optimized TSSOP packaging - making it the only option among the three capable of sustained 2A output from 48V input with industrial temperature support.
Availability
LT3430IFE#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and distributed telecom systems requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LT3430IFE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3430IFE#PBF belongs to Linear's high-voltage monolithic buck regulator product line, engineered specifically for rugged industrial and automotive power conversion where input transients, wide temperature range, and high efficiency at light loads are critical.
FAQ
What is the maximum input voltage rating for the LT3430IFE#PBF?
The LT3430IFE#PBF has an absolute maximum input voltage rating of 60V on the VIN pin. It is specified to operate continuously from 5.5V to 60V, making it suitable for 48V industrial buses and automotive applications subject to load-dump transients. Operation beyond 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT3430IFE#PBF require an external BOOST capacitor and diode?
Yes, the LT3430IFE#PBF requires an external BOOST capacitor and diode to drive the internal NPN switch into saturation. The BOOST pin must be biased ≥VIN + 1.8V (min) to achieve the specified 0.1Ω switch on-resistance. Typical implementation uses a Schottky diode (e.g., MMSD914) and 100nF ceramic capacitor referenced to the SW pin.
Can the LT3430IFE#PBF be synchronized to an external clock?
Yes, the LT3430IFE#PBF supports external synchronization via its SYNC pin, which accepts logic-level signals (10–90% duty cycle) from 228kHz to 700kHz. This feature enables EMI reduction through clock alignment in multi-converter systems and eliminates beat frequencies in noise-sensitive applications.
What is the purpose of the dual-threshold SHDN pin on the LT3430IFE#PBF?
The SHDN pin on the LT3430IFE#PBF provides two distinct functions: a 2.38V threshold acts as precise undervoltage lockout (UVLO) to prevent startup until VIN reaches a safe level, and a 0.4V threshold forces deep micropower shutdown drawing only 30µA. This enables both controlled power sequencing and ultra-low standby current.
How does the LT3430IFE#PBF handle short-circuit protection?
The LT3430IFE#PBF implements dual-foldback protection triggered by the FB pin: switching frequency reduces ~5:1 when FB falls below 0.8V, and peak switch current limit folds back when FB drops below 0.6V. This coordinated response limits power dissipation in the IC, external diode, and inductor during sustained short-circuit events.
LT3430IFE#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):
- 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#PBF FAQ
1.How can I place an order for LT3430IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3430IFE#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 LT3430IFE#PBF reliable?
The price and inventory of LT3430IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3430IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3430IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3430IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3430IFE#PBF?
LT3430IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3430IFE#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 LT3430IFE#PBF?
For technical support, including LT3430IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3430IFE#PBF requirements.
6.How does Aetrix verify that LT3430IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3430IFE#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 LT3430IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3430IFE#PBF?
All LT3430IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3430IFE#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 LT3430IFE#PBF part is unused and in its original packaging.
Return procedure for LT3430IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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