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Analog Devices Inc. LT3437IFE#TRPBF
- Part No.:
- LT3437IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3437IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:787
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Product details
Overview
LT3437IFE#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 operates from 3.3V to 60V input, delivers up to 500mA peak switch current, features 200kHz fixed-frequency operation, 100µA quiescent current in Burst Mode, and integrates a 0.8Ω NPN power switch - used in 14V/42V automotive systems and battery-powered industrial controllers.
For engineers reviewing the LT3437IFE#TRPBF datasheet, LT3437IFE#TRPBF pinout, LT3437IFE#TRPBF application, or LT3437IFE#TRPBF equivalent, key selection criteria include input transient tolerance (80V load dump), thermal performance in the 3mm × 3mm DFN package, soft-start control via CSS pin, and defeatable Burst Mode for ripple-sensitive light-load operation.
Technical Context
The LT3437IFE#TRPBF employs current-mode control with cycle-by-cycle peak current limiting and internal slope compensation, enabling fast transient response and stable loop behavior across wide duty cycles. Its patented circuitry maintains constant peak switch current (500mA min) over full duty cycle range, independent of input/output voltage ratio.
It uses a BOOST pin-driven external capacitor-diode network to saturate the integrated NPN switch, reducing VCE(SAT) to 400mV at 500mA. The BIAS pin allows output-derived biasing to improve efficiency at high VIN-to-VOUT ratios, while SYNC enables external clock synchronization up to 700kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 60V continuous; withstands 80V/100ms transients (load dump protection) |
| Switch Current Limit | 500mA minimum peak - ensures consistent power delivery under varying duty cycles |
| Quiescent Current | 100µA in Burst Mode - enables >1-year battery life in always-on automotive modules |
| Switching Frequency | 200kHz typical - balances EMI, inductor size, and efficiency for compact designs |
| Reference Voltage | 1.25V ±2.5% - sets regulated output via external resistor divider with low FB bias current (50nA) |
| Package Thermal Resistance | θJA = 45°C/W, θJC(PAD) = 10°C/W - requires exposed pad soldered to PCB ground for thermal reliability |
| Operating Junction Temp | –40°C to +125°C - qualified for under-hood automotive and industrial ambient environments |
Pinout & Package
LT3437IFE#TRPBF is housed in a thermally enhanced 10-pin 3mm × 3mm DFN package (0.75mm height) with exposed GND pad (Pin 11) requiring solder connection to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: SW | Switch emitter node | Connects to inductor; drives catch diode cathode; clamped externally to prevent negative swing |
| Pin 2: VIN | Input supply collector | High-di/dt node - must be routed short and low-inductance to input capacitor and SW |
| Pin 3: BOOST | Switch drive boost supply | External capacitor-diode network raises drive voltage above VIN to saturate NPN switch |
| Pin 4: GND | Main signal and power ground | Reference for FB, VC, and output regulation; must tie directly to load ground path |
| Pin 5: CSS | Soft-start current sense | Capacitor to VOUT controls dV/dt ramp rate; threshold scales with FB voltage |
| Pin 6: BIAS | Efficiency-optimized bias supply | Accepts ≥2.7V (e.g., VOUT) to source internal bias current - reduces VIN quiescent draw |
| Pin 7: VC | Error amplifier output / current clamp | Direct access to control loop; can override switching or force sleep by grounding |
| Pin 8: FB | Feedback reference input | Senses 1.25V divider point; enables frequency foldback and soft-start below 0.9V |
| Pin 9: SYNC | External clock synchronization | Logic-level input (1.5–6V); disables Burst Mode when high; sync range up to 700kHz |
| Pin 10: SHDN | Shutdown control | Active-high (≥1.3V); reduces total supply current to <1µA in shutdown state |
Key Features
| Feature | Design Value |
|---|---|
| Load dump protection | Withstands 80V/100ms input transients - eliminates need for external TVS in 42V automotive systems |
| Defeatable Burst Mode | SYNC pin logic-high disables Burst Mode - trades 100µA IQ for lower light-load output ripple |
| Thermally optimized DFN | Exposed pad (Pin 11) tied to GND - achieves θJC = 10°C/W for reliable 500mA operation at 125°C junction |
| Wide-input feedback stability | 1.25V reference with <200nA FB bias current - minimizes divider error and power loss across 3.3–60V input range |
| Controlled soft-start | CSS pin current threshold (4–16µA) scales with FB voltage - prevents inrush into large capacitive loads |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Supply |
|---|---|
|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in under-hood ECUs subject to cold-crank (4.5V) and load-dump (80V) events. IC Role / Device Role / Timing Role: Primary 3.3V/5V step-down regulator with integrated switch and transient protection - replaces discrete FET + controller + TVS solution. Use Value: Eliminates external surge protection components while maintaining 100µA no-load IQ for always-on wake-up circuits. |
Use Scenario: Generating isolated 5V rails for digital I/O modules in factory automation systems with 24VDC field bus input. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from unregulated 24V supply with robust line rejection against motor-switching noise. Use Value: 200kHz fixed frequency simplifies EMI filtering; BIAS pin connection to VOUT improves efficiency from 24V→5V (≥85% at 200mA). |
| Battery-Powered Telematics Unit | Powered Ethernet (PoE) Auxiliary Supply |
|
Use Scenario: Long-life GPS/GSM tracker powered by Li-ion (3.0–4.2V) or lead-acid (9–15V) battery with deep-sleep monitoring. IC Role / Device Role / Timing Role: Main system regulator delivering 3.3V at ≤400mA with ultra-low IQ during cellular idle periods. Use Value: 100µA Burst Mode IQ extends battery runtime; soft-start prevents voltage droop during wake-from-sleep transitions. |
Use Scenario: Deriving 3.3V/5V auxiliary power from PoE midspan (44–57V) for embedded PHY or MCU in IP cameras or VoIP phones. IC Role / Device Role / Timing Role: High-input buck regulator accepting wide PoE voltage range without pre-regulation stage. Use Value: 60V max continuous input and 80V transient rating enable direct PoE interface; SYNC pin allows alignment with Ethernet PHY clock to reduce beat-frequency noise. |
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 |
|---|---|---|---|
| LT3976IMSE#TRPBF | Higher 5A switch current, 3.2V–60V input, 2MHz switching, but 2.5mA IQ (no Burst Mode) | Better suited for high-current, space-constrained designs where low IQ is secondary to power density | Select LT3976IMSE#TRPBF when >500mA output or 2MHz operation is required; avoid if 100µA IQ is mandatory |
| TPS54340DDAR | 3.5V–42V input, 3.5A, 100µA IQ, but only 42V absolute max (no 80V transient rating) | Lacks load-dump immunity - requires external TVS for automotive use | Choose TPS54340DDAR for cost-sensitive industrial supplies with ≤42V input; not recommended for automotive front-end |
Compared with LT3437IFE#TRPBF, LT3976IMSE#TRPBF offers higher current and frequency at the expense of quiescent current, while TPS54340DDAR provides similar IQ but lacks the 80V transient capability critical for automotive qualification - making LT3437IFE#TRPBF uniquely balanced for rugged, low-power high-voltage buck conversion.
Availability
LT3437IFE#TRPBF is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and battery-powered telematics requiring stable component supply with guaranteed long-term availability and AEC-Q100-aligned manufacturing traceability.
Supply support for LT3437IFE#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 (including former Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving automotive, industrial, communications, and aerospace markets with precision, reliability, and innovation.
The LT3437IFE#TRPBF belongs to Linear's high-voltage monolithic buck regulator product line, engineered specifically for harsh-environment power conversion where input transients, thermal constraints, and ultra-low standby power coexist - such as automotive infotainment, ADAS sensors, and industrial edge controllers.
FAQ
What is the maximum input voltage rating for LT3437IFE#TRPBF during transient conditions?
The LT3437IFE#TRPBF supports 80V for 100ms transients (e.g., automotive load dump) with <15% duty cycle, while its continuous operating input range is 3.3V to 60V. This dual-rating eliminates need for external TVS diodes in 12V/42V automotive systems. Exceeding 80V even briefly risks permanent damage per Absolute Maximum Ratings.
How does the BIAS pin improve efficiency in LT3437IFE#TRPBF designs?
The BIAS pin on LT3437IFE#TRPBF accepts ≥2.7V (typically connected to VOUT) to power internal circuitry instead of drawing from VIN. At high input voltages (e.g., 24V→3.3V), this reduces LT3437IFE#TRPBF's input quiescent current from 1.35mA to 0.475mA - directly improving light-load efficiency by shifting bias current source from high-VIN to regulated output rail.
Can LT3437IFE#TRPBF synchronize to an external clock, and what is its sync range?
Yes, LT3437IFE#TRPBF accepts logic-level signals (1.5–6V, 25–75% duty cycle) on the SYNC pin to lock its oscillator. Its synchronization range spans 240kHz to 700kHz - verified across temperature - and automatically disables Burst Mode when SYNC is asserted, enabling deterministic timing for noise-sensitive systems like automotive camera links.
What is the role of the CSS pin in LT3437IFE#TRPBF, and how is it configured?
The CSS pin on LT3437IFE#TRPBF controls soft-start dV/dt by sinking current proportional to FB voltage. A capacitor from CSS to VOUT sets the ramp rate; when CSS current exceeds 4–16µA (FB-dependent), VC is clamped to limit output slew. This prevents inrush into large capacitive loads and avoids input voltage sag during startup - critical for battery-powered applications using LT3437IFE#TRPBF.
Is LT3437IFE#TRPBF pin-compatible with other LT3437 variants like LT3437EFE#TRPBF?
No - LT3437IFE#TRPBF uses the 10-pin 3mm × 3mm DFN package, while LT3437EFE#TRPBF is in a 16-pin TSSOP. Pin functions differ significantly: DFN has dedicated GND (Pin 4) and exposed pad (Pin 11), whereas TSSOP places GND at Pins 8/17 and adds NC pins. PCB layout and thermal design are not interchangeable between LT3437IFE#TRPBF and TSSOP variants.
LT3437IFE#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):
- 57V
- Current - Output:
- 500mA (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
LT3437IFE#TRPBF FAQ
1.How can I place an order for LT3437IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3437IFE#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 LT3437IFE#TRPBF reliable?
The price and inventory of LT3437IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3437IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3437IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3437IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3437IFE#TRPBF?
LT3437IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3437IFE#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 LT3437IFE#TRPBF?
For technical support, including LT3437IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3437IFE#TRPBF requirements.
6.How does Aetrix verify that LT3437IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3437IFE#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 LT3437IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3437IFE#TRPBF?
All LT3437IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3437IFE#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 LT3437IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3437IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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