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Analog Devices Inc. LT3502AEDC#TRPBF
- Part No.:
- LT3502AEDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3502AEDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,266
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Product details
Overview
LT3502AEDC#TRPBF from Analog Devices (formerly Linear Technology) is a 2.2MHz, 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 8-lead 2mm × 2mm DFN package. It operates from 3V to 40V input and delivers regulated 3.3V or 5V output in automotive battery and industrial 24V supply systems.
For engineers reviewing the LT3502AEDC#TRPBF datasheet, LT3502AEDC#TRPBF pinout, LT3502AEDC#TRPBF application, or LT3502AEDC#TRPBF equivalent, key selection criteria include its 2.2MHz fixed switching frequency for AM-band avoidance, cycle-by-cycle current limiting, soft-start via SHDN pin, <2µA shutdown current, and DA-pin-based frequency foldback for short-circuit robustness.
Technical Context
The LT3502AEDC#TRPBF uses constant-frequency current-mode control with an internal oscillator driving an RS flip-flop to gate the bipolar NPN switch. Its error amplifier regulates the VC node to maintain 0.8V at FB, while slope compensation prevents subharmonic oscillation above 50% duty cycle.
Protection architecture includes dual current limiting: peak switch current limit (0.75–1.1A) and DA-pin valley current limit (650mA), which triggers frequency foldback during overload or short-circuit conditions. Soft-start is implemented by ramping the SHDN pin voltage, simultaneously controlling startup current surge and oscillator frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.2MHz - enables use of tiny 6.8µH inductors and avoids AM radio band interference. |
| Input Voltage Range | 3V to 40V - supports direct regulation from automotive batteries and 24V industrial rails. |
| Output Current | 500mA continuous - sustained delivery with thermal derating up to 125°C junction temperature. |
| Feedback Reference | 0.8V ±13mV - sets output voltage via external resistor divider (e.g., 3.3V = 0.8V × (1 + R1/R2)). |
| Shutdown Current | <2µA - enables ultra-low-power system sleep modes without auxiliary regulators. |
| Current Limit Threshold | 0.75–1.1A peak switch / 650mA DA valley - provides layered fault protection with frequency foldback. |
| Package Thermal Resistance | θJA = 102°C/W - requires exposed pad soldered to PCB ground plane for full 125°C operation. |
Pinout & Package
LT3502AEDC#TRPBF is housed in 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 operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Supplies internal regulator and power switch; must be bypassed with ≥1µF ceramic capacitor near pin. |
| BD (Pin 2) | Boost Diode Anode | Connects to internal Schottky diode anode; used to generate BOOST voltage higher than VIN. |
| FB (Pin 3) | Feedback Sense | Regulated to 0.8V; connects to resistor divider tap to set VOUT (e.g., 3.3V or 5V). |
| SHDN (Pin 4) | Shutdown & Soft-Start Control | Logic-level enable (≥2V = ON); external RC network implements controlled voltage ramp for soft-start. |
| GND (Pin 5) | Ground Reference | Power and signal ground; exposed pad (Pin 9) must be soldered to PCB GND for thermal performance. |
| DA (Pin 6) | Diode Anode Monitor | Senses catch diode current; triggers frequency foldback when valley current exceeds 650mA. |
| BOOST (Pin 7) | Switch Driver Supply | Provides boosted gate drive (>VIN) to fully saturate internal NPN switch; connect 0.1µF cap to SW. |
| SW (Pin 8) | Switch Node | Internal power switch output; connects to inductor, catch diode cathode, and BOOST capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Control Loop | Eliminates need for external compensation components - reduces BOM count and layout sensitivity. |
| Integrated Boost Diode | Reduces external component count by one Schottky diode - simplifies design and improves reliability. |
| Cycle-by-Cycle Current Limit | Prevents switch damage during transient overloads - enables robust operation without external sensing. |
| Frequency Foldback Protection | Automatically lowers switching frequency under short-circuit to limit power dissipation and thermal stress. |
| Thermally Enhanced DFN | 2mm × 2mm footprint with exposed GND pad - achieves 102°C/W θJA for high-power density in space-constrained layouts. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Regulation |
|---|---|
Use Scenario: Regulating 12V vehicle battery to 3.3V for MCU, CAN transceiver, and display logic in head units. IC Role / Device Role / Timing Role: Primary buck converter providing stable, low-noise 3.3V rail with AM-band immunity. Use Value: 2.2MHz operation avoids interference with AM/FM radio reception; <2µA shutdown current extends battery life during ignition-off states. | Use Scenario: Converting 24V factory bus to 5V for analog sensor front-ends and isolated data acquisition modules. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator delivering precise 5V output with minimal external components. Use Value: 40V absolute max rating tolerates 24V rail transients; internal compensation ensures stable loop response across temperature and load. |
| Portable Medical Device Supply | Smart Building Controller Power |
Use Scenario: Generating 3.3V from Li-ion battery (3.6–4.2V) or wall adapter (5–12V) for Bluetooth LE microcontroller and sensor array. IC Role / Device Role / Timing Role: Efficient, compact DC/DC converter enabling long runtime and small form factor. Use Value: 500mA output supports active wireless transmission bursts; soft-start via SHDN prevents inrush into capacitive loads. | Use Scenario: Powering HVAC controllers and occupancy sensors from 12–24V PoE-powered or building-supplied rails. IC Role / Device Role / Timing Role: Robust primary regulator handling wide input range and intermittent load profiles. Use Value: Short-circuit robustness and DA-foldback allow safe operation during wiring faults; 125°C rating supports enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502EDC#TRPBF | 1.1MHz switching frequency, 80% max duty cycle, same package and pinout. | Better suited for lower EMI requirements or where larger inductors are acceptable. | Select LT3502EDC#TRPBF when 1.1MHz operation is preferred for reduced radiated emissions or inductor size constraints are relaxed. |
| MP2315DJ-LF-Z | 2.2MHz, 1.5A output, 4.5–28V input, no DA pin or frequency foldback, different pinout. | Lacks short-circuit frequency foldback; requires external compensation and separate boost diode. | Choose MP2315DJ-LF-Z only if higher output current is required and fault protection can be handled externally. |
Compared with LT3502EDC#TRPBF and MP2315DJ-LF-Z, the LT3502AEDC#TRPBF uniquely combines 2.2MHz operation, integrated boost diode, DA-pin frequency foldback, and 0.8V reference in a 2mm × 2mm DFN-enabling smaller, more robust designs for automotive and industrial 3.3V/5V rails.
Availability
LT3502AEDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and portable medical devices requiring stable component supply, high-reliability packaging, and long-term lifecycle support.
Supply support for LT3502AEDC#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 of high-performance analog and power management ICs with rigorous qualification and long-term product support.
The LT3502A belongs to Linear's monolithic current-mode buck regulator family, designed specifically for space-constrained, high-input-voltage applications demanding AM-band immunity, short-circuit robustness, and minimal external components.
FAQ
What is the maximum input voltage rating for the LT3502AEDC#TRPBF?
The LT3502AEDC#TRPBF has an absolute maximum input voltage rating of 40V on the VIN pin. Operation above 40V risks permanent damage. For fixed-frequency regulation, the practical maximum input depends on output voltage and minimum duty cycle (e.g., ~30V for 3.3V output), but transient spikes up to 40V are tolerated if within duration limits specified in the datasheet.
Does the LT3502AEDC#TRPBF require an external boost diode?
No, the LT3502AEDC#TRPBF integrates a boost Schottky diode connected to the BD pin. This eliminates the need for an external diode in standard configurations, reducing component count and board area. External diodes are only recommended for specialized low-VOUT (<3V) designs using the BD pin as an external bias source.
How does the DA pin function in the LT3502AEDC#TRPBF?
The DA pin in the LT3502AEDC#TRPBF monitors catch diode anode current. When valley current exceeds 650mA, it triggers frequency foldback-reducing switching frequency to limit power dissipation during overload or short-circuit events. This complements the peak switch current limit and enhances fault robustness without external circuitry.
Can the LT3502AEDC#TRPBF operate with a 3.3V input?
No-the LT3502AEDC#TRPBF has a 3V undervoltage lockout threshold and requires ≥3V to start, but cannot sustain regulation at 3.3V input when delivering typical output voltages (e.g., 3.3V or 5V) due to minimum duty cycle and switch drop limitations. Minimum functional input is ~4.2V for 3.3V output and ~6.5V for 5V output, per datasheet Figures G19–G22.
What is the purpose of the exposed pad on the LT3502AEDC#TRPBF DFN package?
The exposed pad (Pin 9) on the LT3502AEDC#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour tied to system ground to achieve the specified θJA = 102°C/W and ensure reliable operation at full load and 125°C junction temperature. Omitting this connection degrades thermal performance and may cause premature thermal shutdown.
LT3502AEDC#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):
- 32V
- Current - Output:
- 500mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT3502AEDC#TRPBF FAQ
1.How can I place an order for LT3502AEDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3502AEDC#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 LT3502AEDC#TRPBF reliable?
The price and inventory of LT3502AEDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3502AEDC#TRPBF is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3502AEDC#TRPBF transactions.
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4.How is shipping managed for LT3502AEDC#TRPBF?
LT3502AEDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3502AEDC#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 LT3502AEDC#TRPBF?
For technical support, including LT3502AEDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3502AEDC#TRPBF requirements.
6.How does Aetrix verify that LT3502AEDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3502AEDC#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 LT3502AEDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3502AEDC#TRPBF?
All LT3502AEDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3502AEDC#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 LT3502AEDC#TRPBF part is unused and in its original packaging.
Return procedure for LT3502AEDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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