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Analog Devices Inc. LT3434IFE#PBF
- Part No.:
- LT3434IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3434IFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:525
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Product details
Overview
LT3434IFE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode monolithic buck switching regulator with integrated 3A NPN power switch, 0.1Ω on-resistance, 200kHz fixed-frequency operation, and 100µA quiescent current in Burst Mode. It operates from 3.3V to 60V input, delivers regulated output down to 3.3V, and is used in automotive load-dump-tolerant DC/DC conversion.
For engineers reviewing the LT3434IFE#PBF datasheet, LT3434IFE#PBF pinout, LT3434IFE#PBF application, or LT3434IFE#PBF equivalent, key selection considerations include its 60V absolute max input rating, programmable Power Good flag with 88–92% VREF threshold, thermal shutdown protection, exposed-pad TSSOP-16 package for low θJC (10°C/W), and compatibility with external synchronization up to 500kHz.
Technical Context
The LT3434IFE#PBF employs constant-frequency current-mode control with cycle-by-cycle peak current limiting and an internal 1.25V reference. Its error amplifier output (VC pin) directly sets the switch current trip point, enabling fast transient response and stable loop compensation across wide duty cycles.
It integrates patented circuitry to maintain peak switch current over full duty cycle range and uses BOOST pin-driven saturation of the internal NPN switch-enabling 0.1Ω effective on-resistance despite high-voltage operation. Burst Mode reduces quiescent current to 100µA at light loads while preserving regulation via output-biased internal circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 60V - supports 14V/42V automotive systems and industrial 24V/48V rails without external pre-regulation. |
| Switch Current Limit | 3A (min), 4.7A (typ) - enables ≥2A continuous output with margin for transient peaks and thermal derating. |
| Quiescent Current | 100µA in Burst Mode - sustains ultra-low standby power in battery-powered or always-on automotive modules. |
| Feedback Reference | 1.25V ±2.5% - allows precise output voltage setting via standard resistor divider; FB input bias ≤200nA minimizes divider error. |
| Switching Frequency | 200kHz (±15%) - balances EMI, inductor size, and efficiency; externally synchronizable from 230kHz to 500kHz. |
| Power Good Threshold | 88–92% of VREF - programmable via PGFB resistive divider; provides reliable output-valid indication with adjustable delay via CT capacitor. |
| Thermal Protection | Internal shutdown at TJ ≥125°C - prevents damage during overload or poor heatsinking; guaranteed operation from –40°C to 125°C junction. |
Pinout & Package
LT3434IFE#PBF is housed in a 16-pin thermally enhanced TSSOP package with exposed pad (Pin 17), which must be soldered to GND for thermal and electrical integrity (θJC = 10°C/W). The package footprint matches JEDEC MO-153, and lead finish is lead-free (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 2,5) | Emiter of internal NPN switch | Carries full inductor current; requires low-inductance path to catch diode and input capacitor to limit VCE spikes. |
| VIN (Pins 3,4) | Collector of internal NPN switch + primary supply | Accepts up to 60V; powers internal circuitry unless BIAS pin is active; high dI/dt node requiring short, wide traces. |
| BOOST (Pin 6) | Switch driver boost supply | Enables full saturation of NPN switch via external capacitor/diode; minimum 1.8V boost voltage required for 3A operation. |
| GND (Pins 8,17) | Power and signal reference | Exposed pad (Pin 17) is GND and mandatory thermal path; PCB ground plane connection essential for thermal performance and load regulation. |
| FB (Pin 12) | Feedback input | Senses output via resistive divider; 1.25V reference enables accurate regulation; <0.9V triggers frequency foldback and soft-start reactivation. |
| PGFB (Pin 13) | Power Good comparator input | Programmable threshold (88–92% of VREF); initiates PG delay timing when exceeded; supports input- or output-referenced monitoring. |
| SHDN (Pin 15) | Enable/disable control | Logic-compatible input; >1.3V enables regulator; <1.15V disables with <2µA shutdown current. |
| PG (Pin 16) | Open-drain Power Good output | Active-low flag with 200µA sink capability; high-impedance when output is valid per PGFB/CT timing. |
Key Features
| Feature | Design Value |
|---|---|
| Load Dump Protection | Withstands 60V transients without external clamping-critical for 12V/24V automotive systems meeting ISO 7637-2 Pulse 5a. |
| Burst Mode Operation | Reduces no-load input current to 100µA while maintaining regulation-enables compliance with automotive "parking mode" current budgets. |
| Saturating Switch Design | 0.1Ω typical on-resistance achieved via BOOST-assisted NPN saturation-delivers higher efficiency than non-saturated bipolar or discrete FET solutions at high VIN/VOUT ratios. |
| Programmable Power Good | Adjustable threshold (via PGFB divider) and delay (via CT capacitor) enable system-level sequencing and fault detection without external logic. |
| Soft-Start Control | CSS pin accepts capacitor to output for controlled dV/dt ramp-prevents inrush current during startup into large capacitive loads (e.g., infotainment power rails). |
| External Synchronization | SYNC pin accepts 230–500kHz logic-level signals-allows EMI reduction by locking to system clock or avoiding sensitive frequency bands. |
Applications
| Automotive Front-End Power Supply | Industrial 48V DC/DC Converter |
|---|---|
Use Scenario: Powering ADAS camera modules and radar sensors from 12V or 42V vehicle battery with load dump immunity. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 3.3V/5V with programmable Power Good for microcontroller reset coordination. Use Value: 60V absolute max rating and integrated load dump tolerance eliminate need for external TVS, reducing BOM count and board area. |
Use Scenario: Converting 48V distributed power bus to 5V for PLC I/O modules in factory automation. IC Role / Device Role / Timing Role: High-efficiency buck controller managing 2A continuous load with Burst Mode for low-idle power in sleep states. Use Value: 0.1Ω switch RON and BOOST-assisted saturation deliver >90% efficiency at 48V→5V, minimizing thermal design burden. |
| High-Voltage Battery-Powered Instrumentation | Distributed Telecom Power System |
Use Scenario: Regulating power from 36V Li-ion battery packs in portable test equipment with strict standby current limits. IC Role / Device Role / Timing Role: Main DC/DC converter enabling <100µA quiescent draw in measurement idle mode via Burst Mode. Use Value: Confirmed 100µA IQ at no load extends battery runtime significantly versus alternatives requiring >500µA sleep current. |
Use Scenario: Point-of-load conversion in 48V telecom shelves where multiple outputs require synchronized switching to suppress beat frequencies. IC Role / Device Role / Timing Role: Synchronizable 200kHz buck regulator aligned to system clock to minimize conducted EMI in dense backplane environments. Use Value: SYNC pin supports 230–500kHz lock range-enables deterministic noise placement and simplifies EMI filter design. |
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 |
|---|---|---|---|
| LTC3639EMSE#PBF | 40V max input, 2A switch, integrated MOSFETs, 3mm × 4mm MSOP; no BOOST pin or load dump rating. | Lower voltage industrial/medical supplies where 60V tolerance is unnecessary; lacks automotive transient robustness. | Choose LTC3639EMSE#PBF only if input stays ≤40V and board space is critical-LT3434IFE#PBF remains superior for 42V+ automotive or industrial surge environments. |
| MPQ4333GQ-AEC1-Z | 60V max input, 3.5A switch, synchronous rectification, AEC-Q100 Grade 1; no programmable PG or CSS soft-start. | Automotive applications requiring AEC-Q100 qualification and higher efficiency at medium loads; lacks flexible PG timing and soft-start control. | Choose MPQ4333GQ-AEC1-Z for production automotive programs needing AEC-Q100 certification; LT3434IFE#PBF offers greater design flexibility for prototyping and non-qualified industrial use. |
Compared with LTC3639EMSE#PBF and MPQ4333GQ-AEC1-Z, the LT3434IFE#PBF uniquely combines 60V load dump tolerance, programmable Power Good timing, and BOOST-enabled saturation in a single TSSOP package-making it optimal for ruggedized 14V/42V designs where transient resilience and sequencing control outweigh synchronous efficiency gains.
Availability
LT3434IFE#PBF is available at Aetrix Electronics and suitable for automotive front-end power supplies, industrial 48V DC/DC converters, and high-voltage battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3434IFE#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 and maintains full technical and manufacturing continuity for the LT product line, including rigorous automotive-grade testing and long-term process stability.
The LT3434IFE#PBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for demanding automotive, industrial, and telecom applications where input transients, wide VIN ranges, and low-quiescent-power operation are critical.
FAQ
What is the maximum input voltage the LT3434IFE#PBF can withstand continuously?
The LT3434IFE#PBF has a continuous operating input voltage range of 3.3V to 60V. Its absolute maximum rating is 60V on VIN, SHDN, BIAS, PGOOD, and SW pins-confirmed across temperature and validated for sustained operation in 42V automotive systems and industrial 48V rails. Exceeding 60V risks permanent damage.
Does the LT3434IFE#PBF support synchronization to an external clock?
Yes, the LT3434IFE#PBF supports external synchronization via its SYNC pin, which accepts logic-level inputs with 30–70% duty cycle across a 230kHz to 500kHz range. Synchronization is disabled only when FB voltage drops below 0.9V (e.g., during startup or fault conditions), ensuring robust timing control in normal operation.
How does the BOOST pin function in the LT3434IFE#PBF, and what external components are required?
The BOOST pin on the LT3434IFE#PBF supplies elevated gate drive to saturate the internal NPN switch. It requires an external flying capacitor (typically 100nF ceramic) and Schottky diode (e.g., Diodes Inc. B1100) from SW to BOOST. This configuration ensures the switch achieves 0.1Ω on-resistance even at high VIN/VOUT ratios, directly improving efficiency.
What is the purpose of the CSS pin on the LT3434IFE#PBF, and how is it configured?
The CSS pin on the LT3434IFE#PBF controls soft-start by accepting a capacitor connected between CSS and the regulated output. When output voltage ramps up, current through this capacitor is monitored; exceeding the CSS threshold (~7–20µA) clamps VC to regulate dV/dt. This prevents inrush current into large output capacitors-critical for reliable startup in systems with >100µF output capacitance.
Is thermal performance dependent on PCB layout for the LT3434IFE#PBF?
Yes-thermal performance of the LT3434IFE#PBF is highly dependent on PCB layout. Its exposed pad (Pin 17) must be soldered to a solid copper ground plane to achieve the specified θJC of 10°C/W. Insufficient thermal vias or isolated pad routing increases junction temperature, potentially triggering thermal shutdown under 2A load at high ambient temperatures.
LT3434IFE#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
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 55.2V
- Current - Output:
- 3A (Switch)
- 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
LT3434IFE#PBF FAQ
1.How can I place an order for LT3434IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3434IFE#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 LT3434IFE#PBF reliable?
The price and inventory of LT3434IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3434IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3434IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3434IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3434IFE#PBF?
LT3434IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3434IFE#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 LT3434IFE#PBF?
For technical support, including LT3434IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3434IFE#PBF requirements.
6.How does Aetrix verify that LT3434IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3434IFE#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 LT3434IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3434IFE#PBF?
All LT3434IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3434IFE#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 LT3434IFE#PBF part is unused and in its original packaging.
Return procedure for LT3434IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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