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Analog Devices Inc. LT3434EFE#PBF
- Part No.:
- LT3434EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3434EFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:356
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Product details
Overview
LT3434EFE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode synchronous step-down switching regulator IC designed for automotive and industrial power conversion. It supports 3.3V to 60V input, delivers up to 3A peak switch current, operates at 200kHz fixed frequency, features 100µA quiescent current in Burst Mode, and integrates a 0.1Ω NPN power switch - enabling robust 14V/42V automotive systems and battery-powered applications requiring load dump protection to 60V.
For engineers reviewing the LT3434EFE#PBF datasheet, LT3434EFE#PBF pinout, LT3434EFE#PBF application, or LT3434EFE#PBF equivalent, this page provides verified technical context on its high-voltage buck architecture, programmable Power Good flag, soft-start control via CSS pin, thermal-enhanced TSSOP-16EP package with exposed GND pad, and design-critical parameters including 1.25V feedback reference, 90% max duty cycle, and 3A peak current limit maintained across full duty range.
Technical Context
The LT3434EFE#PBF implements constant-frequency current-mode control using an internal 200kHz oscillator and dual-loop regulation: the error amplifier sets the peak switch current threshold, while the current comparator monitors SW node current on a cycle-by-cycle basis. This architecture delivers fast transient response and stable loop compensation without external slope compensation.
It employs a patented BOOST pin circuit that elevates gate drive voltage above VIN using an external capacitor-diode network, enabling full saturation of the integrated 0.1Ω NPN switch - reducing conduction loss comparable to a low-RDS(on) MOSFET. Burst Mode operation dynamically disables non-essential circuitry below light loads, sustaining 100µA input quiescent current while maintaining regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 60V - supports direct connection to 42V automotive batteries and industrial rails without pre-regulation. |
| Peak Switch Current | 3A (min), 4.7A (typ) - sustains full current capability across 0–92% duty cycle, critical for high-step-down ratios. |
| Switch On Resistance | 0.1Ω (typ) - achieved via BOOST-assisted saturation, minimizing I²R loss at high load currents. |
| Quiescent Current | 100µA in Burst Mode - enables always-on systems (e.g., infotainment standby) with ultra-low no-load power draw. |
| Feedback Reference | 1.25V ±2.5% (–40°C to 125°C) - precise setpoint for accurate output voltage regulation across temperature. |
| Power Good Threshold | Programmable at 88–92% of VREF - allows configurable output voltage monitoring with adjustable delay via CT capacitor. |
| Operating Junction Temp | –40°C to 125°C - qualified for under-hood automotive and harsh industrial environments. |
Pinout & Package
LT3434EFE#PBF is housed in a 16-pin thermally enhanced TSSOP package with exposed GND pad (Pin 17), requiring soldering to PCB ground plane for optimal thermal performance (θJA = 45°C/W, θJC(PAD) = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 2, 5) | Emiter of internal NPN switch | Connects to inductor; clamped externally during off-time; handles full switch current and high dI/dt. |
| VIN (Pins 3, 4) | Collector of internal NPN switch & primary supply | Accepts up to 60V input; powers control circuitry when BIAS is inactive; requires low-inductance path to SW via catch diode. |
| BOOST (Pin 6) | Boost capacitor drive node | Provides >VIN gate drive to saturate NPN switch; requires external capacitor + Schottky diode (e.g., B1100). |
| GND (Pins 8, 17) | Signal & thermal reference | Exposed pad (Pin 17) must be soldered to PCB ground plane for thermal management and accurate load regulation. |
| FB (Pin 12) | Feedback input | Senses 1.25V reference point; enables output voltage setting, frequency foldback below 0.4V, and soft-start activation below 0.9V. |
| PGFB (Pin 13) | Power Good comparator input | Accepts resistive divider from VOUT; triggers programmable PG delay when exceeding 88–92% of VREF. |
| SHDN (Pin 15) | Shutdown control | Active-high logic input; >1.3V enables operation; <1µA shutdown current enables ultra-low-power system sleep. |
| PG (Pin 16) | Open-drain Power Good output | Active-low flag with 200µA sink capability; high-impedance when CT clamp is active (output valid). |
Key Features
| Feature | Design Value |
|---|---|
| Load Dump Protection | Withstands 60V transients on VIN - eliminates need for external TVS in 14V/42V automotive systems per ISO 7637-2. |
| Burst Mode Operation | Reduces input quiescent current to 100µA at no load while maintaining regulation - extends battery life in portable equipment. |
| Programmable Power Good | Configurable threshold (88–92% of 1.25V) and delay time via CT capacitor - enables precise system power sequencing. |
| Soft-Start Control | Output ramp rate controlled by CSS capacitor to VOUT - prevents inrush current during startup and brownout recovery. |
| External Synchronization | SYNC pin accepts 230–500kHz logic-level inputs - enables noise-sensitive designs to avoid EMI bands and synchronize multiple converters. |
Applications
| Automotive Infotainment Power Supply | Industrial 24V-to-5V Conversion |
|---|---|
|
Use Scenario: Powering DSP, display, and USB peripherals in vehicle head units from 14V battery rail with cold-crank (4.5V) and load-dump (60V) transients. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V/2A output; manages transient immunity via BOOST-saturated switch and 60V VIN rating. Use Value: Eliminates need for upstream pre-regulator or external TVS, reducing BOM count and board space while meeting AEC-Q100 stress requirements. |
Use Scenario: Converting unregulated 24V factory floor supply to clean 3.3V for PLC I/O modules operating continuously in ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: High-efficiency step-down controller with thermal shutdown and Burst Mode for low-idle power in fanless enclosures. Use Value: Maintains >85% efficiency at 100mA–2A load range and 100µA quiescent current enables 24/7 operation without forced cooling. |
| Portable Medical Battery System | Ruggedized IoT Edge Node |
|
Use Scenario: Regulating power from 3S Li-ion (9–12.6V) to 3.3V for wireless telemetry and sensor interface in handheld diagnostic devices. IC Role / Device Role / Timing Role: Compact, high-input buck converter with soft-start (CSS) and programmable PGOOD for safe boot sequencing. Use Value: 16-pin TSSOP-EP package fits tight layouts; 100µA Burst Mode current extends runtime between charges without compromising start-up reliability. |
Use Scenario: Powering LoRaWAN gateway electronics in outdoor cabinets exposed to –40°C to 85°C ambient with wide-input solar/battery hybrid sources. IC Role / Device Role / Timing Role: Wide-input (3.3–60V) buck regulator supporting variable input from MPPT charger or backup battery. Use Value: –40°C to 125°C junction rating ensures reliability across extreme environments; load-dump tolerance protects against battery disconnect spikes. |
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 |
|---|---|---|---|
| LTC3632EMSE#PBF | 40V max input, 2A continuous, 3mm × 4mm MSOP-10, no BOOST pin, uses external MOSFETs | Lower voltage/size-constrained designs where 60V rating and integrated switch are not required | Select when board space is critical and input stays ≤40V; requires external high-side/low-side FETs and gate drivers. |
| MPQ4333GJ-AEC1-P | 60V max input, 3.5A peak, 2.5µA shutdown current, AEC-Q100 Grade 1, QFN-16 | Automotive-qualified alternative with lower IQ in shutdown but no programmable PGOOD or soft-start control | Choose for production automotive programs needing AEC-Q100 certification; lacks LT3434EFE#PBF's flexible PG timing and CSS-based soft-start. |
Compared with LTC3632EMSE#PBF and MPQ4333GJ-AEC1-P, the LT3434EFE#PBF uniquely combines 60V input tolerance, integrated BOOST-saturated NPN switch, programmable Power Good with delay, and CSS-controlled soft-start - making it optimal for ruggedized, high-transient industrial and legacy automotive systems where design flexibility and transient resilience outweigh footprint constraints.
Availability
LT3434EFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial 24V-to-5V conversion, and portable medical battery systems requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for LT3434EFE#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, serving precision instrumentation, automotive, industrial, and communications markets.
The LT3434EFE#PBF belongs to Linear's high-voltage monolithic buck regulator product line, engineered specifically for automotive and industrial power systems demanding robustness against load dump, cold crank, and wide input variations without external high-voltage support components.
FAQ
What is the maximum input voltage rating for the LT3434EFE#PBF?
The LT3434EFE#PBF has an absolute maximum input voltage rating of 60V on the VIN and SHDN pins, and it is specifically designed to withstand automotive load dump transients up to 60V without damage or regulation loss. Its operational input range is 3.3V to 60V, enabling direct connection to 14V and 42V battery systems. The BOOST pin tolerates up to 68V, and the SW pin is rated for –0.8V negative swing during flyback recovery.
How does the BOOST pin function in the LT3434EFE#PBF?
The BOOST pin in the LT3434EFE#PBF provides elevated gate drive voltage to fully saturate the internal NPN power switch, reducing conduction loss to that of a 0.1Ω FET. It requires an external capacitor and Schottky diode (e.g., Diodes Inc. B1100) connected between VIN and BOOST. During switch turn-on, the BOOST capacitor supplies current to raise the base drive above VIN, ensuring low VCE(sat) even at high input voltages - a key enabler of high efficiency across the 3.3–60V input range.
Can the LT3434EFE#PBF be synchronized to an external clock?
Yes, the LT3434EFE#PBF supports external synchronization via the SYNC pin, which accepts logic-level inputs from 230kHz to 500kHz with 30–70% duty cycle. Synchronization is disabled only when the FB pin voltage falls below 0.9V (e.g., during soft-start or fault conditions). This feature allows noise-sensitive applications - such as RF modules or precision ADC power supplies - to align switching edges and avoid interference in critical frequency bands.
What is the purpose of the CSS pin on the LT3434EFE#PBF?
The CSS pin on the LT3434EFE#PBF controls soft-start behavior by sensing current through an external capacitor connected to VOUT. When the CSS capacitor current exceeds the ICSS threshold (7–20µA), the error amplifier limits output voltage slew rate to prevent inrush current. The soft-start function activates automatically when FB < 0.9V - during startup or brownout recovery - and is defeated above 0.9V, enabling full-bandwidth regulation during normal operation.
Does the LT3434EFE#PBF include thermal protection?
Yes, the LT3434EFE#PBF incorporates thermal shutdown protection that disables switching when the junction temperature exceeds approximately 165°C. Recovery occurs once the die cools below the hysteresis threshold (~15°C below trip point). Combined with its thermally enhanced TSSOP-16EP package (θJC(PAD) = 10°C/W), this ensures reliable operation in sealed enclosures or high-ambient industrial environments - a critical safeguard for continuous-duty 3A power conversion.
LT3434EFE#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3434EFE#PBF FAQ
1.How can I place an order for LT3434EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3434EFE#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 LT3434EFE#PBF reliable?
The price and inventory of LT3434EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3434EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3434EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3434EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3434EFE#PBF?
LT3434EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3434EFE#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 LT3434EFE#PBF?
For technical support, including LT3434EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3434EFE#PBF requirements.
6.How does Aetrix verify that LT3434EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3434EFE#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 LT3434EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3434EFE#PBF?
All LT3434EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3434EFE#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 LT3434EFE#PBF part is unused and in its original packaging.
Return procedure for LT3434EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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