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Analog Devices Inc. LT3502EDC#TRMPBF
- Part No.:
- LT3502EDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3502EDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,713
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Product details
Overview
LT3502EDC#TRMPBF from Analog Devices (formerly Linear Technology) is a 1.1MHz, 500mA current-mode PWM step-down DC/DC converter with integrated 500mA bipolar NPN power switch, 0.8V feedback reference, and internal boost diode - designed for industrial 24V supplies and automotive battery inputs (3V–40V). It delivers regulated 3.3V/5V outputs in compact 2mm × 2mm 8-lead DFN packaging with thermally enhanced exposed pad.
For engineers reviewing the LT3502EDC#TRMPBF datasheet, LT3502EDC#TRMPBF pinout, LT3502EDC#TRMPBF application, or LT3502EDC#TRMPBF equivalent, key selection criteria include input voltage range (3V–40V), switching frequency (1.1MHz), output current capability (500mA), thermal performance (θJA = 102°C/W), and robust short-circuit protection via DA valley current limit and frequency foldback.
Technical Context
The LT3502EDC#TRMPBF employs constant-frequency current-mode control with cycle-by-cycle peak current limiting and DA-pin-triggered frequency foldback to manage fault conditions. Its internal bipolar NPN switch requires BOOST voltage ≥2.2V above SW for full saturation, enabled by an integrated Schottky boost diode and external BOOST capacitor.
Operation relies on a 0.8V precision feedback reference, internally compensated error amplifier, and soft-start controlled via SHDN pin ramping. Undervoltage lockout (~2.8V) prevents startup below 3V, while maximum duty cycle (90%) and minimum on-time (60ns) define practical input–output voltage boundaries for fixed-frequency operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports direct regulation from 12V/24V industrial rails and automotive batteries without pre-regulation. |
| Output Current | 500mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained systems. |
| Switching Frequency | 1.1MHz - enables use of sub-10µH inductors and low-ESR ceramic capacitors, minimizing solution footprint. |
| Feedback Reference | 0.8V ±13mV - allows precise output programming (e.g., 3.3V with 10k/32.4k divider) with minimal resistor tolerance impact. |
| Shutdown Current | <2µA - ensures ultra-low system standby power in battery-backed or energy-sensitive applications. |
| Thermal Resistance | θJA = 102°C/W (DFN) - requires exposed pad soldering to PCB ground plane for reliable 125°C junction operation. |
| Current Limit | 0.75A to 1.1A (typ. 0.9A) - provides overcurrent protection while allowing brief inrush during load transients. |
Pinout & Package
LT3502EDC#TRMPBF uses an 8-lead 2mm × 2mm plastic DFN package with exposed thermal pad (Pin 9, GND). The package is RoHS-compliant, lead-free, and rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input supply | Supplies internal regulator and power switch; must be locally bypassed with ≥1µF X7R/X5R ceramic capacitor. |
| BD (Pin 2) | Boost diode anode connection | Connects to internal Schottky boost diode; ties to BOOST capacitor cathode to generate gate drive voltage > VIN. |
| FB (Pin 3) | Feedback reference node | Regulated to 0.8V; sets output via resistor divider (VOUT = 0.8 × (1 + R1/R2)); bias current ≤50nA minimizes divider error. |
| SHDN (Pin 4) | Shutdown and soft-start control | Logic-high (≥2V) enables operation; grounded disables output; RC network here implements programmable soft-start ramp. |
| GND (Pin 5) | Power and signal ground | Common return for internal circuits, switch, and exposed thermal pad - must be soldered to PCB ground plane. |
| DA (Pin 6) | Diode anode sensing input | Monitors catch diode current; triggers frequency foldback when valley current exceeds 650mA during overload/short. |
| BOOST (Pin 7) | Switch driver bootstrap node | Must be ≥2.2V above SW for optimal NPN saturation; connected to BOOST capacitor (typically 0.1µF) between BOOST and SW. |
| SW (Pin 8) | Switch node output | Drives external inductor and catch diode; high dv/dt node requiring tight layout and minimized trace length. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode, reducing BOM count and PCB area in boost-capacitor-based gate drive path. |
| Internally compensated | Removes need for external compensation network - simplifies design and improves stability across operating conditions. |
| Cycle-by-cycle current limit | Prevents switch destruction during momentary overloads by terminating each switching cycle at programmed peak current. |
| Frequency foldback on DA fault | Reduces switching frequency under short-circuit conditions to maintain safe power dissipation and inductor current control. |
| Soft-start via SHDN pin | Enables controlled output voltage ramp using external R-C network, eliminating input current surge and output overshoot. |
Applications
| Industrial Power Regulation | Automotive Body Control |
|---|---|
|
Use Scenario: Regulating 24V rail to 3.3V for PLC I/O modules and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering stable 3.3V/500mA with high input transient tolerance (40V abs max). Use Value: Wide 3V–40V input range eliminates need for upstream pre-regulator; 1.1MHz switching enables <10mm² total solution size. |
Use Scenario: Powering CAN transceivers and microcontrollers in door modules, seat controllers, and lighting ECUs. IC Role / Device Role / Timing Role: Immune-to-AM-band interference buck regulator meeting automotive cold-crank (4.5V min) and load-dump (40V) requirements. Use Value: Constant 1.1MHz operation avoids AM radio band (530–1710kHz); frequency foldback sustains operation during battery short events. |
| Portable Instrumentation | Distributed Telecom Supply |
|
Use Scenario: Generating 5V from 9V–36V Li-ion battery packs or wall adapters in handheld test equipment. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with <2µA shutdown current enabling multi-week battery standby life. Use Value: Low quiescent current (2mA no-switching) and soft-start prevent brownout during battery insertion or wake-up events. |
Use Scenario: Local point-of-load conversion in base station RF cards where 48V backplane is stepped to 5V/3.3V for FPGAs and ADCs. IC Role / Device Role / Timing Role: Robust buck controller tolerant of high-impedance distributed supplies and long PCB traces. Use Value: Input UVLO (2.8V) and DA-based fault management ensure reliable restart after brownouts; DFN package aids thermal management in dense layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502AEDC#TRMPBF | 2.2MHz switching frequency, 80% max duty cycle, tighter FB tolerance (±1.25% vs ±1.6%). | Better suited for ultra-compact designs needing smaller inductors; less ideal for high-VIN/low-VOUT ratios due to lower DCMAX. | Select LT3502AEDC#TRMPBF when board space is critical and input voltage does not exceed 24V for 3.3V output. |
| LMR14050SDDAR | 40V, 500mA buck with 2.1MHz option, MOSFET-based, higher efficiency at light loads, no internal boost diode. | Requires external bootstrap diode/capacitor; lacks DA-foldback but offers better light-load efficiency via PFM mode. | Choose LMR14050SDDAR for higher efficiency in battery-powered apps where DA fault response is secondary to quiescent power. |
Compared with LT3502AEDC#TRMPBF and LMR14050SDDAR, the LT3502EDC#TRMPBF provides superior fault resilience via dual current limiting (peak + DA valley), simpler layout (integrated boost diode), and proven robustness in industrial 24V environments - at the cost of slightly larger magnetics and no PFM mode.
Availability
LT3502EDC#TRMPBF is available at Aetrix Electronics and suitable for industrial power regulation, automotive body control, and portable instrumentation requiring stable component supply, extended temperature support (–40°C to 125°C), and long-term lifecycle continuity.
Supply support for LT3502EDC#TRMPBF 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 its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LT3502 series was designed specifically for rugged, wide-input-voltage DC/DC conversion in space-constrained industrial and automotive systems - emphasizing fault tolerance, thermal efficiency, and minimal external component count.
FAQ
What is the maximum input voltage rating for LT3502EDC#TRMPBF?
The absolute maximum input voltage for LT3502EDC#TRMPBF is 40V, as specified in the Absolute Maximum Ratings table. Continuous operation above 40V will cause permanent damage. For reliable fixed-frequency operation, the practical maximum input depends on output voltage and duty cycle limits - e.g., ~33V for 3.3V output at full load. Transient spikes up to 40V are tolerated if within duration limits defined by thermal mass and layout.
Does LT3502EDC#TRMPBF require an external catch diode?
Yes, LT3502EDC#TRMPBF requires an external Schottky catch diode (e.g., Diodes Inc. DFLS140 or ON Semi MBRM140) connected between SW and GND, with anode tied to the DA pin. The internal boost diode is not used for catch function - it only serves the BOOST capacitor charging path. The external diode must withstand full input voltage and conduct peak inductor current.
How is soft-start implemented on LT3502EDC#TRMPBF?
Soft-start on LT3502EDC#TRMPBF is implemented by connecting an RC network (e.g., 100kΩ + 100nF) between VIN and SHDN pin. During startup, the capacitor charges linearly, ramping the SHDN voltage and thereby controlling the error amplifier's VC node and oscillator frequency. This limits inrush current and prevents output overshoot - unlike hard-start configurations that trigger immediate full-current switching.
What thermal design considerations apply to LT3502EDC#TRMPBF?
LT3502EDC#TRMPBF has θJA = 102°C/W in the 2mm × 2mm DFN package. To maintain ≤125°C junction temperature at full 500mA load and 40V input, the PCB must include a minimum 100mm² copper pour connected to the exposed thermal pad (Pin 9) with ≥4 thermal vias (0.3mm diameter) to inner ground planes. Ambient temperature must remain ≤85°C for continuous operation at maximum ratings.
Can LT3502EDC#TRMPBF operate with a 2.5V input supply?
No, LT3502EDC#TRMPBF cannot operate with a 2.5V input supply. Its undervoltage lockout activates below ~2.8V (typ.), and minimum functional input is ~3V. Attempting to power it from 2.5V will result in no switching activity and zero output. For sub-3V inputs, consider alternative regulators such as the LTC3642 or MAX17504, which support down to 2.3V or lower.
LT3502EDC#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN 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):
- 40V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 500mA
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT3502EDC#TRMPBF FAQ
1.How can I place an order for LT3502EDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3502EDC#TRMPBF 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 LT3502EDC#TRMPBF reliable?
The price and inventory of LT3502EDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3502EDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3502EDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3502EDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3502EDC#TRMPBF?
LT3502EDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3502EDC#TRMPBF 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 LT3502EDC#TRMPBF?
For technical support, including LT3502EDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3502EDC#TRMPBF requirements.
6.How does Aetrix verify that LT3502EDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3502EDC#TRMPBF 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 LT3502EDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3502EDC#TRMPBF?
All LT3502EDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3502EDC#TRMPBF, 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 LT3502EDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT3502EDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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