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Analog Devices Inc. LT3502EDC#TRPBF
- Part No.:
- LT3502EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3502EDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,865
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Product details
Overview
LT3502EDC#TRPBF 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, internal boost diode, and thermally enhanced 2mm × 2mm 8-lead DFN package. It operates from 3V to 40V input and delivers regulated 3.3V or 5V output in industrial power supplies and automotive subsystems.
For engineers reviewing the LT3502EDC#TRPBF datasheet, LT3502EDC#TRPBF pinout, LT3502EDC#TRPBF application, or LT3502EDC#TRPBF equivalent, key selection criteria include its 1.1MHz fixed switching frequency, 800mV feedback voltage accuracy, cycle-by-cycle current limiting, soft-start via SHDN pin, and robust short-circuit protection with frequency foldback.
Technical Context
The LT3502EDC#TRPBF implements constant-frequency current-mode control using an internal oscillator, RS flip-flop, and slope-compensated current-sense amplifier. Its VC node is servo-controlled by an error amplifier monitoring FB voltage, with active clamping for current limit and SHDN-ramped soft-start.
It integrates an internal regulator with undervoltage lockout (~3V), BOOST-driven switch driver, and DA-pin-based valley-current comparator that triggers frequency foldback below 650mA catch-diode current-enabling fault-tolerant operation under shorted-output conditions at high VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.1MHz - enables use of small 6.8µH inductors and avoids AM-band interference. |
| Input Voltage Range | 3V to 40V - supports 24V industrial rails and automotive battery inputs with transient tolerance. |
| Output Current | 500mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs. |
| Feedback Voltage | 0.79V to 0.81V (typical 0.8V) - sets precise output via resistor divider; R2 = 10kΩ recommended. |
| Shutdown Current | <2µA - enables ultra-low-power standby in battery-backed systems. |
| Current Limit | 0.75A to 1.1A (typical 0.9A) - provides cycle-by-cycle overcurrent protection with thermal derating. |
| Package | 2mm × 2mm 8-lead DFN - exposes thermal pad (Pin 9) for PCB soldering; θJA = 102°C/W. |
Pinout & Package
LT3502EDC#TRPBF uses a thermally enhanced 2mm × 2mm 8-lead plastic DFN package with exposed GND pad (Pin 9) requiring PCB soldering for thermal performance. Pin numbering follows top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Supplies internal regulator and power switch; requires local 1µF ceramic bypass. |
| BD (Pin 2) | Boost diode anode | Connects to external boost capacitor; internal Schottky diode reduces component count. |
| FB (Pin 3) | Feedback sense | Regulated to 0.8V; sets VOUT = 0.8 × (1 + R1/R2); R2 = 10kΩ minimizes bias error. |
| SHDN (Pin 4) | Shutdown/soft-start control | Logic-high ≥2V enables operation; RC network here provides controlled start-up and frequency foldback. |
| GND (Pin 5) | Ground reference | Common return for power and signal paths; exposed pad (Pin 9) must be soldered to PCB ground plane. |
| DA (Pin 6) | Diode anode monitor | Detects catch-diode valley current; triggers frequency foldback if >650mA to limit fault current. |
| BOOST (Pin 7) | Switch driver boost | Driven ~2.2V above SW to fully saturate internal NPN switch; requires 0.1µF capacitor to SW. |
| SW (Pin 8) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation components; simplifies layout and reduces BOM count. |
| Internal boost diode | Reduces external component count by integrating Schottky diode for BOOST capacitor charging. |
| Soft-start via SHDN pin | RC-filtered SHDN ramp controls VC node rise time, preventing input surge and output overshoot. |
| Short-circuit robustness | Combines peak switch current limit (0.9A typ) and DA-valley current foldback (650mA) for sustained fault survival. |
| Thermally enhanced DFN | 2mm × 2mm footprint with exposed GND pad achieves 102°C/W junction-to-ambient thermal resistance. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Regulating 24V rail to 5V 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 5V/500mA with input transients up to 40V. Use Value: 1.1MHz operation allows compact 6.8µH inductor and 10µF ceramic output capacitor, reducing board area by >40% vs. lower-frequency alternatives. |
Use Scenario: Powering CAN transceivers and microcontrollers in door module ECUs where input ranges from 9V–16V battery with load-dump spikes. IC Role / Device Role / Timing Role: Input-robust step-down regulator with UVLO and frequency foldback during cold-crank conditions. Use Value: 3V–40V input range and <2µA shutdown current enable reliable start-up and low quiescent drain in always-on vehicle networks. |
| Wall Adapter Regulation | Distributed Supply Regulation |
Use Scenario: Converting 12V wall adapter output to 3.3V for Wi-Fi SoCs and USB peripherals in consumer gateways. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in continuous conduction mode at full 500mA load. Use Value: 0.8V feedback reference and internal compensation deliver ±2% output regulation across line/load/temperature without trimming. |
Use Scenario: Local point-of-load regulation on multi-layer PCBs for FPGA I/O banks requiring clean 3.3V supply with fast transient response. IC Role / Device Role / Timing Role: Compact DFN-packaged regulator placed adjacent to load to minimize trace inductance and EMI. Use Value: Exposed thermal pad and 102°C/W θJA allow 500mA delivery at 125°C ambient without forced airflow or heatsinks. |
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#TRPBF | 2.2MHz switching frequency, 80% max duty cycle, tighter FB tolerance (±1.25% vs ±2.5%) | Better suited for ultra-compact designs needing smaller inductors; higher frequency increases light-load switching losses. | Select LT3502AEDC#TRPBF when board space is constrained and 2.2MHz operation is acceptable for efficiency trade-off. |
| LMR14050SQDDARQ1 | 40V input, 500mA, 2.1MHz, integrated MOSFET, AEC-Q100 Grade 1 qualified | Automotive-qualified with enhanced ESD and fault reporting; no internal boost diode (requires external). | Choose LMR14050SQDDARQ1 for production automotive systems requiring AEC-Q100 compliance and diagnostic capability. |
Compared with LT3502EDC#TRPBF, LT3502AEDC#TRPBF offers higher frequency and tighter regulation but reduced max duty cycle, while LMR14050SQDDARQ1 adds automotive qualification and MOSFET integration at the cost of external boost circuitry and larger solution size.
Availability
LT3502EDC#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and distributed point-of-load regulation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3502EDC#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 its legacy power management portfolio with full technical support and long-term manufacturing commitment.
The LT3502 series was designed for high-input-voltage, space-constrained DC/DC conversion in industrial and automotive environments where reliability, thermal performance, and minimal external components are critical.
FAQ
What is the maximum input voltage rating for LT3502EDC#TRPBF?
The absolute maximum input voltage for LT3502EDC#TRPBF is 40V on the VIN pin. Operation above 40V risks permanent damage. For fixed-frequency regulation, maximum practical input depends on output voltage and duty cycle limits-e.g., at 3.3V output, VIN(MAX) ≈ 28V for continuous mode. Transient spikes up to 40V are tolerated if within duration limits specified in the datasheet.
Does LT3502EDC#TRPBF require an external catch diode?
Yes, LT3502EDC#TRPBF requires an external Schottky catch diode (e.g., Diodes Inc. DFLS140 or ON Semi MBRM140) connected between SW and GND. The device integrates only the BOOST diode-not the main power path diode-so omission will cause failure. Diode reverse voltage rating must exceed maximum input voltage.
How does the DA pin function in LT3502EDC#TRPBF?
The DA pin in LT3502EDC#TRPBF monitors valley current through the external catch diode. When DA current exceeds 650mA, the IC reduces switching frequency to limit fault current during short-circuit events. This frequency foldback works alongside cycle-by-cycle peak current limiting to provide dual-layer protection without external circuitry.
Can LT3502EDC#TRPBF operate in pulse-skipping mode?
Yes, LT3502EDC#TRPBF enters pulse-skipping mode when required on-time falls below 60ns-typically at high input voltages or light loads. In this mode, the switch remains off for multiple cycles, increasing output ripple but maintaining regulation. Pulse-skipping is safe and does not degrade reliability if output capacitors and inductors are properly rated.
What is the purpose of the exposed pad (Pin 9) on LT3502EDC#TRPBF?
The exposed pad (Pin 9) on LT3502EDC#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour for effective heat dissipation. Omitting this connection raises junction temperature by >30°C at full load and may trigger thermal shutdown. Thermal vias to inner ground planes are strongly recommended.
LT3502EDC#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT3502EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3502EDC#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 LT3502EDC#TRPBF reliable?
The price and inventory of LT3502EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3502EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3502EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3502EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3502EDC#TRPBF?
LT3502EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3502EDC#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 LT3502EDC#TRPBF?
For technical support, including LT3502EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3502EDC#TRPBF requirements.
6.How does Aetrix verify that LT3502EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3502EDC#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 LT3502EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3502EDC#TRPBF?
All LT3502EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3502EDC#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 LT3502EDC#TRPBF part is unused and in its original packaging.
Return procedure for LT3502EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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