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Analog Devices Inc. LT3434IFE#TRPBF
- Part No.:
- LT3434IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3434IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,804
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Product details
Overview
LT3434IFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode monolithic buck switching regulator designed for automotive and industrial power conversion. It supports 3.3V to 60V input, delivers up to 3A peak switch current with 0.1Ω on-resistance, operates at 200kHz fixed frequency, and achieves 100µA quiescent current in Burst Mode - enabling efficient 14V/42V automotive step-down (e.g., 12V→3.3V/5V) with load dump protection to 60V.
For engineers reviewing the LT3434IFE#TRPBF datasheet, LT3434IFE#TRPBF pinout, LT3434IFE#TRPBF application, or LT3434IFE#TRPBF equivalent, key selection considerations include its wide VIN range, programmable Power Good flag, soft-start via CSS pin, thermal-enhanced 16-pin TSSOP package with exposed pad, and compatibility with external synchronization up to 500kHz - critical for noise-sensitive or multi-rail systems.
Technical Context
The LT3434IFE#TRPBF implements constant-frequency current-mode control using an internal 200kHz oscillator and dual feedback loops: one for output voltage regulation (via error amplifier and 1.25V reference), and another for cycle-by-cycle peak switch current limiting (3A typical, 4.7A max). Its bipolar NPN switch is driven by a BOOST-supplied voltage higher than VIN, enabling saturation and low conduction loss (0.1Ω).
Burst Mode operation reduces quiescent current to 100µA at light loads by disabling non-essential circuitry while maintaining regulation; shutdown draws <1µA. The device integrates programmable Power Good (PGFB threshold = 90% of VREF ±2%), soft-start (CSS-controlled dV/dt), and thermal shutdown - all validated across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 60V - supports direct connection to 14V/42V automotive batteries and industrial rails without pre-regulation. |
| Peak Switch Current | 3A (typ), 4.7A (max) - sustains full current over full duty cycle range, enabling robust 2A continuous output with margin. |
| Switch On Resistance | 0.1Ω (typ) - achieved via BOOST-driven saturated NPN, minimizing conduction loss and thermal stress. |
| Quiescent Current | 100µA in Burst Mode - enables >1000-hour battery life in always-on automotive modules (e.g., CAN nodes, sensors). |
| Feedback Reference | 1.25V ±2.5% (1.225–1.275V) - precise setpoint for stable output regulation across temperature and line/load variations. |
| Switching Frequency | 200kHz (180–230kHz) - balances EMI performance, inductor size, and efficiency for compact 33µH designs. |
| Operating Temperature | –40°C to +125°C (junction) - qualified for under-hood automotive and industrial environments. |
Pinout & Package
LT3434IFE#TRPBF is housed in a thermally enhanced 16-pin TSSOP package with exposed pad (Pin 17), requiring soldering to PCB ground plane for optimal thermal resistance (θJC = 10°C/W). The exposed pad is electrically GND and must be connected to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 2, 5) | Emiter of internal NPN power switch | Connects to inductor and catch diode cathode; handles high dI/dt; clamped to –0.8V max during off-time. |
| VIN (Pins 3, 4) | Collector of internal NPN switch & primary supply | Accepts 3.3–60V input; powers internal circuitry when BIAS is unconnected; requires low-inductance path to SW/GND. |
| BOOST (Pin 6) | Switch driver voltage boost node | Drives NPN base above VIN via external capacitor/diode; ensures saturation and 0.1Ω RCE(SAT). |
| GND (Pins 8, 17) | Power and signal reference / thermal sink | Pins 8 and 17 are common GND; exposed pad (Pin 17) must be soldered to PCB ground plane for thermal management. |
| FB (Pin 12) | Feedback input for output voltage regulation | Senses 1.25V reference; sets output via resistor divider; enables frequency foldback and soft-start below 0.9V. |
| PGFB (Pin 13) | Power Good comparator input | Monitors regulated output or input rail; triggers PG flag when ≥90% of VREF; supports programmable delay via CT pin. |
| SHDN (Pin 15) | Shutdown control input | Active-high logic interface; >1.3V enables operation; <1.15V disables IC and reduces IIN to <1µA. |
| PG (Pin 16) | Open-drain Power Good output | Active-low flag (200µA sink) indicating valid output; high-impedance when PGFB threshold is met and CT delay expires. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode Operation | Reduces quiescent current to 100µA at light loads while maintaining regulation - essential for battery longevity in always-on systems. |
| Programmable Power Good Flag | PGFB threshold set at 90% of 1.25V reference (±2%) with external CT capacitor defining delay time - enables reliable system power sequencing. |
| Soft-Start Control | CSS pin accepts capacitor to output to limit dV/dt during startup - prevents inrush current and stabilizes large capacitive loads. |
| Load Dump Protection | Withstands 60V transients on VIN - meets ISO 7637-2 Pulse 5a requirements for 12V/24V automotive applications. |
| External Synchronization | SYSN pin accepts 230–500kHz logic-level signals (30–70% duty) - enables EMI reduction via frequency alignment in multi-converter systems. |
| Thermally Enhanced Package | 16-pin TSSOP with exposed GND pad (θJC = 10°C/W) - enables 3A operation without heatsink in ambient ≤85°C. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24V-to-5V Power Supply |
|---|---|
|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensors in vehicle door modules with 14V battery input subject to load dump transients. IC Role / Device Role / Timing Role: Primary 14V→5V buck regulator providing stable 5V rail with 100µA no-load IQ and 60V transient tolerance. Use Value: Eliminates need for external TVS or pre-regulator; Burst Mode extends battery life during sleep mode; PG flag enables safe MCU wake-up sequencing. |
Use Scenario: Converting 24V factory floor power to 5V for PLC I/O modules operating in high-temperature enclosures. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC converter delivering 2A continuous output with minimal derating at 85°C ambient. Use Value: Exposed-pad TSSOP maintains junction temperature <125°C without heatsink; 0.1Ω switch minimizes thermal rise; SYNC pin enables noise-free operation alongside motor drives. |
| 42V Telecom Power Distribution | Portable Test Equipment Power |
|
Use Scenario: Stepping down 42V intermediate bus to 3.3V for FPGA and ADC subsystems in telecom base station cards. IC Role / Device Role / Timing Role: Wide-input buck regulator supporting 36–60V input range with programmable PG flag for hot-swap compliance. Use Value: 60V absolute max rating allows direct connection to 42V bus without derating; 200kHz switching enables small 33µH inductors; BIAS pin improves efficiency at high VIN/VOUT ratios. |
Use Scenario: Battery-powered handheld tester requiring ultra-low standby current and fast transient response during measurement bursts. IC Role / Device Role / Timing Role: Primary 3.7V Li-ion to 3.3V LDO-replacement regulator with 100µA IQ and current-mode loop stability. Use Value: Burst Mode extends battery runtime >3× vs continuous-mode regulators; 200kHz frequency avoids audio-band noise; soft-start prevents display flicker during power-on. |
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 |
|---|---|---|---|
| LTC3642EMSE#PBF | 40V max input, 2A output, 3mm × 4mm MSOP, integrated MOSFETs, 2.5µA IQ | Better for space-constrained, lower-current (<2A) designs; lacks 60V rating and load dump protection | Select when board area is critical and input never exceeds 40V; not suitable for automotive load dump. |
| MPQ4333GJ-AEC1-P | 60V max input, 3A, AEC-Q100 Grade 1, 175°C junction, QFN-12 | Automotive-qualified with extended temp range; no programmable PG or soft-start; higher 250µA IQ | Choose for production automotive ECUs requiring AEC-Q100 certification; trade-off is reduced feature set and higher quiescent current. |
Compared with LTC3642EMSE#PBF and MPQ4333GJ-AEC1-P, the LT3434IFE#TRPBF uniquely combines 60V input, 3A capability, 100µA Burst Mode IQ, programmable Power Good, and load dump protection in a single thermally optimized package - making it optimal for cost-sensitive, high-reliability 14V/42V industrial and automotive power stages where feature completeness matters more than footprint or AEC-Q100 certification.
Availability
LT3434IFE#TRPBF is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24V/42V power supplies, and portable test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3434IFE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and medical markets.
The LT3434IFE#TRPBF belongs to Linear's high-voltage monolithic buck regulator product line, engineered specifically for robust, wide-input power conversion in harsh environments - including automotive load dump, industrial transients, and battery-powered systems demanding ultra-low quiescent current.
FAQ
What is the maximum input voltage the LT3434IFE#TRPBF can withstand during load dump events?
The LT3434IFE#TRPBF has an absolute maximum VIN rating of 60V and is explicitly characterized for load dump protection up to 60V per datasheet specifications. This meets ISO 7637-2 Pulse 5a requirements for 12V automotive systems. During such transients, the internal circuitry remains functional if proper input capacitance and layout practices are followed - ensuring reliable operation without external TVS diodes in many designs.
How does the LT3434IFE#TRPBF achieve 100µA quiescent current, and under what conditions is this guaranteed?
The LT3434IFE#TRPBF achieves 100µA quiescent current through Burst Mode operation, which disables non-essential internal circuitry during light-load conditions while maintaining output regulation. This value is specified at TJ = 25°C with VIN = 12V, VOUT = 3.3V, and BIAS = 0V. At full temperature range (–40°C to 125°C), quiescent current rises to 250µA maximum in sleep mode - still enabling multi-year battery life in always-on applications.
Can the LT3434IFE#TRPBF synchronize to an external clock, and what is its sync frequency range?
Yes, the LT3434IFE#TRPBF supports external synchronization via the SYNC pin, accepting logic-level inputs (30–70% duty cycle) from 230kHz to 500kHz. Synchronization is disabled when FB voltage falls below 0.9V (e.g., during startup or fault conditions) to preserve Burst Mode integrity. This capability allows EMI reduction in multi-converter systems and precise timing alignment in noise-sensitive instrumentation.
What is the purpose of the BOOST pin on the LT3434IFE#TRPBF, and how is it implemented?
The BOOST pin on the LT3434IFE#TRPBF provides a voltage higher than VIN to fully saturate the internal bipolar NPN power switch, reducing its on-resistance to 0.1Ω. It is implemented using an external flying capacitor and Schottky diode (e.g., Diodes Inc. B1100) connected between VIN and BOOST. This architecture mimics the low RDS(on) of a MOSFET while retaining the ruggedness of a bipolar switch - critical for high-efficiency, high-voltage operation.
Does the LT3434IFE#TRPBF require special PCB layout considerations for thermal performance?
Yes - the LT3434IFE#TRPBF's 16-pin TSSOP package features an exposed GND pad (Pin 17) that serves as the primary thermal path. To achieve θJC = 10°C/W, this pad must be soldered directly to a minimum 100mm² copper pour connected to system ground. Thermal vias (≥6× 0.3mm diameter) should connect the pad to inner-layer or back-side ground planes. Failure to implement this results in significant junction temperature rise, especially at 2–3A loads.
LT3434IFE#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
- 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#TRPBF FAQ
1.How can I place an order for LT3434IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3434IFE#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 LT3434IFE#TRPBF reliable?
The price and inventory of LT3434IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3434IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3434IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3434IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3434IFE#TRPBF?
LT3434IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3434IFE#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 LT3434IFE#TRPBF?
For technical support, including LT3434IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3434IFE#TRPBF requirements.
6.How does Aetrix verify that LT3434IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3434IFE#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 LT3434IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3434IFE#TRPBF?
All LT3434IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3434IFE#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 LT3434IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3434IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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