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Analog Devices Inc. LT3435IFE#TRPBF
- Part No.:
- LT3435IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3435IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,114
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Product details
Overview
LT3435IFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode monolithic buck switching regulator with integrated 3A NPN power switch, 500kHz fixed-frequency operation, 1.25V reference, and Burst Mode® functionality enabling 100µA quiescent current at no load. It operates from 3.3V to 60V input and delivers regulated output in automotive, industrial, and battery-powered systems requiring robust load-dump protection and programmable power-good signaling.
For engineers reviewing the LT3435IFE#TRPBF datasheet, LT3435IFE#TRPBF pinout, LT3435IFE#TRPBF application, or LT3435IFE#TRPBF equivalent, key selection criteria include its 60V absolute max input rating, 0.1Ω switch on-resistance, thermal shutdown, soft-start via CSS pin, and compatibility with external synchronization up to 700kHz - all critical for high-reliability DC/DC conversion in harsh environments.
Technical Context
The LT3435IFE#TRPBF employs constant-frequency current-mode control with cycle-by-cycle peak current limiting and an internal 500kHz oscillator. 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 a BOOST pin architecture that supplies >3.3V gate drive above VIN to saturate the internal NPN switch, achieving 0.1Ω on-resistance. Burst Mode® operation disables non-essential circuitry below light-load thresholds, reducing quiescent current to 100µA while maintaining regulation - a design optimized for wide-input, low-IQ applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 60V - supports 12V/24V/42V automotive systems and industrial rails without external pre-regulation. |
| Switch Current Limit | 3A typical peak - sustains full 3A output under worst-case duty cycle conditions per patented design. |
| Quiescent Current | 100µA in Burst Mode® - enables multi-year battery life in always-on monitoring nodes. |
| Switch On-Resistance | 0.1Ω - minimizes conduction loss and thermal rise at 3A, enabling compact thermal design. |
| Feedback Reference | 1.25V ±2.5% - allows precise output voltage setting with standard resistor dividers (e.g., 3.3V @ R1=165kΩ, R2=100kΩ). |
| Power Good Threshold | Programmable at 88–92% of VREF - configurable output-valid flag with user-defined delay via CT capacitor. |
| Sync Frequency Range | Up to 700kHz - permits EMI reduction by locking to system clock or noise-free frequency bands. |
Pinout & Package
LT3435IFE#TRPBF is housed in a thermally enhanced 16-pin TSSOP package with exposed pad (Pin 17), requiring soldering to PCB ground plane for θJC(PAD) = 10°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 2,5) | Emiter of internal NPN switch | Connects to inductor; clamped negative swing ≤ –0.8V; carries full switch current and di/dt stress. |
| VIN (Pins 3,4) | Collector of internal NPN switch & primary supply | Accepts 3.3–60V input; powers internal circuitry unless BIAS is active; requires low-inductance input bypass. |
| BOOST (Pin 6) | Switch driver boost supply node | Drives external bootstrap capacitor/diode to achieve full saturation of NPN switch; enables 0.1Ω RON. |
| GND (Pins 8,17) | Signal & thermal reference | Pins 8 and 17 are common ground; exposed pad (Pin 17) must be soldered to PCB ground plane for thermal management. |
| FB (Pin 12) | Feedback input | Senses output via resistive divider; sets regulation point at 1.25V; enables frequency foldback and soft-start when <0.9V. |
| PGFB (Pin 13) | Power good comparator input | Compares against 90% of VREF; initiates programmable PG delay via CT capacitor when threshold crossed. |
| PG (Pin 16) | Open-drain power good output | Active-low flag (200µA sink) indicating valid output; high-impedance when PGFB threshold met and CT clamp active. |
| SHDN (Pin 15) | Shutdown control | Logic-compatible enable; >1.3V activates regulator; <1.15V shuts down with <2µA supply current. |
Key Features
| Feature | Design Value |
|---|---|
| Load dump protection | Withstands 60V transients on VIN without latch-up or damage - essential for ISO 7637-2 compliant automotive designs. |
| Burst Mode® operation | Reduces input quiescent current to 100µA while maintaining regulation - eliminates need for external enable sequencing in low-power states. |
| Programmable power good | Configurable threshold (88–92% of 1.25V) and delay time via external CT capacitor - supports system-level power sequencing and fault detection. |
| Soft-start control | Output ramp rate controlled by CSS-to-VOUT capacitor; prevents inrush current during startup and brownout recovery. |
| Thermal shutdown | Internal protection triggers at TJ = 125°C and auto-restarts after cooldown - ensures safe operation under overload or poor heatsinking. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 3.3V/5V logic rails in head units exposed to 12V/24V battery with load dump pulses up to 60V. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated output with programmable PG flag for MCU reset coordination. Use Value: Eliminates need for external TVS and pre-regulator stages due to integrated 60V tolerance and robust Burst Mode® efficiency. | Use Scenario: Generating isolated 5V supply for analog sensor interfaces in factory automation controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: High-efficiency buck converter with low-noise output and thermal margin for long-life embedded deployment. Use Value: 0.1Ω switch RON and exposed-pad TSSOP package maintain <45°C junction rise at 2A continuous load, avoiding derating. |
| Portable Test Equipment | USB-Powered Instrumentation |
Use Scenario: Battery-backed portable oscilloscope module requiring 3.3V rail with <100µA sleep current to extend runtime. IC Role / Device Role / Timing Role: Main DC/DC regulator enabling ultra-low-power standby mode via Burst Mode® and shutdown control. Use Value: 100µA quiescent current extends Li-ion battery life from days to months in maintenance-free field deployments. | Use Scenario: Powering FPGA-based data acquisition board from USB 5V source with variable load (100mA–2A). IC Role / Device Role / Timing Role: Wide-input buck converter accepting 4.5–60V input range - accommodates USB-C PD negotiation and legacy USB 5V. Use Value: Input range flexibility allows single BOM to support both USB 5V and higher-voltage auxiliary inputs without redesign. |
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 output, integrated MOSFETs, 3mm × 4mm MSOP; lacks BOOST pin and load-dump hardening. | Targeted at space-constrained, lower-voltage industrial sensors - not suitable for 42V automotive or 60V transients. | Select only if input ≤40V and layout area is critical; verify external transient protection required. |
| LM5164QPWPRQ1 | 65V max input, 1A output, current-mode control, integrated high-side MOSFET; no programmable PG or Burst Mode®. | Designed for automotive ASIL-B systems with built-in diagnostics - requires external PG circuitry and has higher IQ (25µA min, no Burst Mode). | Choose for AEC-Q100 qualified designs needing functional safety features; accept reduced output current and added external components. |
Compared with LTC3639EMSE#PBF and LM5164QPWPRQ1, the LT3435IFE#TRPBF uniquely combines 60V operation, 3A capability, programmable power good, and true 100µA Burst Mode® - making it optimal for ruggedized, high-current, wide-input applications where reliability and low-light-load efficiency are jointly critical.
Availability
LT3435IFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3435IFE#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 and maintains full product support, documentation, and manufacturing continuity for the LT® series.
The LT3435IFE#TRPBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for demanding applications in automotive, industrial, and battery-powered systems where input transients, wide VIN range, and ultra-low quiescent current are mandatory.
FAQ
What is the maximum input voltage rating for the LT3435IFE#TRPBF?
The LT3435IFE#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin, with guaranteed operation from 3.3V to 60V. It also withstands load dump transients up to 60V without damage - a key specification validated per ISO 7637-2 for automotive use. This rating applies regardless of BIAS or BOOST pin states, and exceeds the 42V nominal requirement for 24V truck systems.
Does the LT3435IFE#TRPBF support external synchronization, and what is its sync frequency range?
Yes, the LT3435IFE#TRPBF supports external synchronization via the SYNC pin, which accepts logic-level signals (5–75% duty cycle) from 425kHz up to 700kHz. The internal oscillator locks to the external signal within this range, enabling EMI reduction and system-level clock alignment. Sync is disabled during frequency foldback (FB < 0.9V), ensuring stable operation during fault conditions.
How does the Burst Mode® operation of the LT3435IFE#TRPBF reduce quiescent current?
The LT3435IFE#TRPBF achieves 100µA quiescent current using Burst Mode® operation, which disables the internal oscillator, error amplifier, and gate drivers during light-load intervals. Only essential bias circuitry remains active, drawing minimal current from VIN or BIAS. This mode maintains output regulation while eliminating switching losses - confirmed in datasheet Figure G05 and specified under TJ = 25°C, VIN = 12V, VOUT = 3.3V.
What thermal management requirements apply to the LT3435IFE#TRPBF package?
LT3435IFE#TRPBF uses a 16-pin TSSOP with exposed pad (Pin 17), which must be soldered to a PCB ground plane to achieve θJC(PAD) = 10°C/W. Without this connection, thermal resistance rises significantly, risking thermal shutdown at >1.5A loads. The datasheet specifies θJA = 45°C/W with 2-inch² 2oz copper, and requires GND pins 8 and 17 to share the same low-impedance ground net for optimal regulation and thermal performance.
Can the LT3435IFE#TRPBF be used without the BOOST pin, and what is the impact on efficiency?
No - the BOOST pin is mandatory for proper operation of the LT3435IFE#TRPBF. It supplies elevated gate drive to fully saturate the internal NPN switch; omitting the BOOST capacitor/diode results in ~1.5V VCE(sat) and excessive conduction loss. With BOOST implemented, switch on-resistance drops to 0.1Ω, enabling >90% efficiency at 2A. The BOOST circuit is not optional - it is fundamental to the device's high-efficiency, high-voltage architecture.
LT3435IFE#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:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3435IFE#TRPBF FAQ
1.How can I place an order for LT3435IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3435IFE#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 LT3435IFE#TRPBF reliable?
The price and inventory of LT3435IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3435IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3435IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3435IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3435IFE#TRPBF?
LT3435IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3435IFE#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 LT3435IFE#TRPBF?
For technical support, including LT3435IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3435IFE#TRPBF requirements.
6.How does Aetrix verify that LT3435IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3435IFE#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 LT3435IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3435IFE#TRPBF?
All LT3435IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3435IFE#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 LT3435IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3435IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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