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Analog Devices Inc. LT3434EFE#TRPBF
- Part No.:
- LT3434EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3434EFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,075
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Product details
Overview
LT3434EFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode step-down switching regulator IC designed for automotive and industrial power conversion. It operates from 3.3V to 60V input, delivers up to 3A peak switch current, features 200kHz fixed-frequency operation, 0.1Ω internal NPN switch on-resistance, and Burst Mode® operation enabling 100µA quiescent current at no load - ideal for 14V/42V automotive systems requiring low standby power.
For engineers reviewing the LT3434EFE#TRPBF datasheet, LT3434EFE#TRPBF pinout, LT3434EFE#TRPBF application, or LT3434EFE#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, real-world application mappings, and two rigorously cross-checked alternative parts with documented functional and packaging differences.
Technical Context
The LT3434EFE#TRPBF implements constant-frequency current-mode control using an internal 200kHz oscillator, error amplifier output (VC pin), and cycle-by-cycle peak current sensing via the SW node. Its patented saturating NPN switch architecture-boosted by an external BOOST capacitor/diode network-achieves 0.1Ω effective on-resistance and maintains 3A peak current across full duty cycle range.
It integrates programmable Power Good flag (via PGFB/CT pins), soft-start (CSS pin), synchronization (SYNC pin), and Burst Mode® operation that reduces quiescent current to 100µA while preserving fast transient response. Thermal shutdown and load dump protection to 60V support robust operation in harsh automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 60V - supports direct connection to 42V automotive battery rails and industrial 48V systems without pre-regulation. |
| Switch Peak Current Limit | 3A (min), 4.7A (typ) - ensures reliable 2A continuous output with margin for transient loads and inductor saturation. |
| Quiescent Current (Burst Mode) | 100µA - enables >1-year battery life in always-on vehicle modules (e.g., telematics, CAN gateways). |
| Switch On Resistance | 0.1Ω (max) - minimizes conduction loss at high load; enables <150mV VCE(SAT) at 2A, TJ = 125°C. |
| Feedback Reference Voltage | 1.25V ±2.5% (–40°C to 125°C) - allows precise output regulation (e.g., 3.3V ±1%) with standard 1% resistor dividers. |
| Power Good Threshold | Programmable at 88–92% of VREF - supports accurate undervoltage detection for downstream microcontrollers or FPGAs. |
| Operating Junction Temp | –40°C to 125°C - qualified for under-hood automotive applications per AEC-Q100 stress test conditions. |
Pinout & Package
LT3434EFE#TRPBF is housed in a 16-lead thermally enhanced TSSOP package with exposed pad (Pin 17), requiring soldering to PCB ground plane for thermal resistance θJC(PAD) = 10°C/W and θJA = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 2, 5) | Emiter of internal NPN power switch | Drives inductor; clamped externally by catch diode; negative swing ≤ –0.8V allowed during off-time. |
| VIN (Pins 3, 4) | Collector of internal NPN switch + primary supply for control circuitry | Must be decoupled with low-ESR ceramic cap near pins; high dI/dt path requires minimal loop area. |
| BOOST (Pin 6) | Boost voltage supply for NPN base drive | Enables full saturation; requires external capacitor + Schottky diode (e.g., B1100); min boost voltage = 1.8V. |
| GND (Pins 8, 17) | Power and signal reference / thermal pad | Exposed pad (Pin 17) must be soldered to solid ground plane; critical for thermal performance and load regulation. |
| FB (Pin 12) | Inverting input of error amplifier | Sets output voltage via resistive divider; 1.25V reference; 75nA max input bias current affects high-R divider accuracy. |
| PGFB (Pin 13) | Positive input of Power Good comparator | Accepts resistive divider from VOUT or VIN; triggers PG delay when exceeding 90% × VREF. |
| SYNC (Pin 14) | External clock synchronization input | Logic-compatible (1.5–2.0V threshold); accepts 230–500kHz external clock; disabled below FB = 0.9V. |
| SHDN (Pin 15) | Enable/disable control | Active-high; 1.3V threshold; draws <20µA; reduces total supply current to <2µA in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces quiescent current to 100µA at no load while maintaining <50µs wake-up time and stable regulation. |
| Load Dump Protection | Withstands 60V transients on VIN without latch-up or degradation - meets ISO 7637-2 Pulse 5a requirements. |
| Programmable Power Good Flag | Configurable threshold (88–92% of 1.25V) and delay (via CT capacitor) for precise system power sequencing. |
| Soft-Start Control | Output ramp rate controlled by CSS capacitor; prevents inrush current during startup or brownout recovery. |
| Thermally Enhanced Package | 16-pin TSSOP with exposed GND pad achieves θJA = 45°C/W - enables 2A continuous operation at +85°C ambient. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24V/48V DC-DC Converter |
|---|---|
|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface in vehicle door module with 12V/24V battery input and strict 100µA sleep current requirement. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.3V/2A; provides Power Good signal to enable MCU reset and wake-up logic. Use Value: Burst Mode® ensures compliance with ISO 16750-2 quiescent current limits; load dump tolerance eliminates need for external TVS. |
Use Scenario: Converting 48V factory bus to 5V for PLC I/O modules operating in high-temperature enclosures. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with thermal shutdown and programmable PG flag for system health monitoring. Use Value: 0.1Ω switch RDS(on) and exposed-pad TSSOP enable >90% efficiency at 2A/5V; 125°C junction rating supports uncooled operation. |
| 14V Automotive Infotainment Supply | Battery-Powered Telematics Unit |
|
Use Scenario: Generating stable 5V rail from noisy 14V car battery for display controller and audio codec in head unit. IC Role / Device Role / Timing Role: Input-filtered buck converter with SYNC pin synchronized to system clock to reduce EMI in sensitive RF bands. Use Value: 200kHz fixed frequency + synchronization capability enables deterministic noise placement; BOOST pin ensures low dropout at cold-crank (6.5V VIN). |
Use Scenario: Long-life power supply for GPS/GSM tracker powered by 3.7V Li-ion battery with 12V ignition-sensed wake-up. IC Role / Device Role / Timing Role: Wide-input buck regulator accepting 3.3V–60V; uses BIAS pin connected to output to improve light-load efficiency. Use Value: BIAS pin architecture reduces input current by >40% at 10mA load vs. VIN-only operation; shutdown current <1µA extends shelf life. |
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; no BOOST pin; uses integrated MOSFETs; 2.5µA quiescent current. | Lower voltage range; unsuitable for 42V load dump or 60V transients; better for space-constrained 24V systems. | Select LTC3642EMSE#PBF only if input stays ≤40V and board area is critical; LT3434EFE#TRPBF remains preferred for 60V-rated automotive designs. |
| MPQ4312-AEC1-P | AEC-Q100 Grade 1, 60V input, 3A, 500kHz, integrated MOSFETs; 28µA IQ; no programmable PG or SYNC. | Higher switching frequency enables smaller magnetics; lacks PG programmability and external sync - limits system-level timing control. | Choose MPQ4312-AEC1-P for cost-sensitive AEC-Q100 production where PG/SYNC are not required; LT3434EFE#TRPBF offers superior design flexibility for complex power sequencing. |
Compared with LTC3642EMSE#PBF and MPQ4312-AEC1-P, the LT3434EFE#TRPBF uniquely combines 60V absolute maximum rating, programmable Power Good, external synchronization, and proven load dump resilience - making it the only option qualified for demanding 42V automotive front-end regulation where transient robustness and system coordination are mandatory.
Availability
LT3434EFE#TRPBF is available at Aetrix Electronics and suitable for automotive body electronics, industrial 48V power distribution, and battery-powered telematics requiring stable component supply, long-term lifecycle support, and guaranteed AEC-Q100-compliant sourcing.
Supply support for LT3434EFE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3434EFE#TRPBF belongs to Linear's legacy high-voltage monolithic buck regulator product line, engineered specifically for automotive and industrial applications demanding wide input range, low IQ, and rugged transient handling - not general-purpose DC-DC conversion.
FAQ
What is the absolute maximum input voltage rating for the LT3434EFE#TRPBF?
The LT3434EFE#TRPBF has an absolute maximum input voltage rating of 60V on VIN, SHDN, BIAS, PGOOD, and SW pins. This rating enables direct connection to 42V automotive systems and withstands ISO 7637-2 Load Dump transients without external protection. Exceeding 60V risks permanent damage per Absolute Maximum Ratings table in the datasheet.
Does the LT3434EFE#TRPBF require an external BOOST capacitor and diode?
Yes, the LT3434EFE#TRPBF requires an external BOOST capacitor and Schottky diode (e.g., Diodes Inc. B1100) connected between VIN and BOOST pins. This network generates a voltage ≥1.8V above VIN to fully saturate the internal NPN switch, achieving the specified 0.1Ω on-resistance and maintaining 3A peak current across all duty cycles.
How does Burst Mode® operation affect light-load efficiency in the LT3434EFE#TRPBF?
Burst Mode® operation in the LT3434EFE#TRPBF reduces quiescent current to 100µA at no load by disabling non-essential circuitry between switching bursts. This preserves >85% efficiency down to 1mA output current and enables multi-year battery life in always-on automotive modules - verified in Typical Performance Characteristics Figure TA02b.
Can the LT3434EFE#TRPBF be synchronized to an external clock?
Yes, the LT3434EFE#TRPBF supports external synchronization via the SYNC pin, which accepts logic-level inputs (1.5–2.0V threshold) with 30–70% duty cycle across 230–500kHz. Synchronization is automatically disabled when FB voltage falls below 0.9V (e.g., during startup or fault conditions) to ensure reliable Burst Mode® and foldback operation.
What is the thermal performance of the LT3434EFE#TRPBF in its TSSOP package?
The LT3434EFE#TRPBF in 16-lead TSSOP with exposed pad achieves θJA = 45°C/W and θJC(PAD) = 10°C/W when the exposed pad (Pin 17) is soldered to a minimum 1-inch² copper ground plane. This allows 2A continuous output at +85°C ambient without forced air cooling - confirmed in Thermal Characteristics section and Figure G01–G09.
LT3434EFE#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3434EFE#TRPBF FAQ
1.How can I place an order for LT3434EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3434EFE#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 LT3434EFE#TRPBF reliable?
The price and inventory of LT3434EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3434EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3434EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3434EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3434EFE#TRPBF?
LT3434EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3434EFE#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 LT3434EFE#TRPBF?
For technical support, including LT3434EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3434EFE#TRPBF requirements.
6.How does Aetrix verify that LT3434EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3434EFE#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 LT3434EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3434EFE#TRPBF?
All LT3434EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3434EFE#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 LT3434EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3434EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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