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Analog Devices Inc. LT3502AEDC#TRMPBF
- Part No.:
- LT3502AEDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3502AEDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,662
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Product details
Overview
LT3502AEDC#TRMPBF 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 2mm × 2mm 8-lead 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#TRMPBF datasheet, LT3502AEDC#TRMPBF pinout, LT3502AEDC#TRMPBF application, or LT3502AEDC#TRMPBF equivalent, key selection criteria include its 2.2MHz switching frequency enabling compact magnetics, short-circuit robustness via DA valley current limit and frequency foldback, soft-start implementation via SHDN pin, and guaranteed operation from –40°C to 125°C junction temperature.
Technical Context
The LT3502AEDC#TRMPBF uses constant-frequency current-mode control with cycle-by-cycle peak current limiting and DA-pin–monitored valley current foldback to manage fault conditions. Its oscillator drives an RS flip-flop controlling the internal bipolar NPN switch, while the error amplifier servoing the VC node regulates output voltage via the 0.8V FB reference.
Internal regulation includes undervoltage lockout (~2.8V), and the BOOST pin-driven by an internal Schottky diode and external capacitor-provides gate drive voltage >VIN to fully saturate the power switch. Soft-start is implemented by ramping the SHDN pin voltage with an external RC network, simultaneously controlling startup current and oscillator frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.2MHz - enables use of sub-10µH inductors and 1µF ceramic input caps; avoids AM band interference. |
| Input Voltage Range | 3V to 40V - supports direct connection to automotive batteries (12V/24V) and industrial supplies without pre-regulation. |
| Output Current | 500mA continuous - specified with thermal derating up to 125°C junction; limited by peak switch current (0.9A typ) and DA valley current (650mA). |
| Feedback Reference | 0.8V ±13mV - sets output voltage via resistor divider (e.g., 3.3V = 0.8V × (1 + R1/R2)); low tolerance reduces output error across line/load/temp. |
| Shutdown Current | <2µA - ensures ultra-low system standby power; SHDN pin pulled low disables switching and disconnects output. |
| Package Thermal Resistance | θJA = 102°C/W - exposed pad (Pin 9) must be soldered to PCB ground plane for rated performance in high-power-density layouts. |
| Operating Temperature | –40°C to 125°C - qualified for automotive under-hood and industrial embedded applications per data sheet Grade E/A specs. |
Pinout & Package
LT3502AEDC#TRMPBF is housed in a thermally enhanced 8-lead 2mm × 2mm plastic DFN package with exposed GND pad (Pin 9). The package requires soldering the exposed pad to a PCB thermal plane for thermal performance compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Supplies internal regulator and power switch; must be bypassed locally with ≥1µF X7R/X5R ceramic capacitor. |
| BD (Pin 2) | Boost diode anode connection | Connects to internal Schottky diode anode; ties to BOOST capacitor cathode in standard configuration. |
| FB (Pin 3) | Feedback sensing node | Regulated to 0.8V; connects to resistor divider tap between VOUT and GND to set output voltage. |
| SHDN (Pin 4) | Shutdown and soft-start control | Pulled low to disable IC (<2µA IQ); driven with RC ramp for controlled start-up and frequency foldback. |
| GND (Pin 5) | Power and signal reference | Common return for internal circuits, SW node, and exposed thermal pad (Pin 9). |
| DA (Pin 6) | Diode anode current monitor | Detects catch diode conduction; triggers frequency foldback when valley current exceeds 650mA during faults. |
| BOOST (Pin 7) | Bootstrap gate drive supply | Driven above SW by internal diode + external capacitor; must exceed SW by ≥2.2V for full switch saturation. |
| SW (Pin 8) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor anode; carries high di/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode in BOOST path, reducing BOM count and layout area in space-constrained designs. |
| DA-pin frequency foldback | Reduces switching frequency during overloads/shorts to maintain 650mA valley current limit, preventing thermal runaway without external circuitry. |
| Internally compensated | Requires no external compensation components; simplifies design and improves stability across input/output/load variations. |
| Thermally enhanced DFN | 2mm × 2mm footprint with exposed GND pad achieves θJA = 102°C/W - enables 500mA output in <4mm² board area. |
| AM-band–free operation | 2.2MHz fixed frequency places switching noise well above 1.6MHz AM radio band, eliminating RF interference in automotive infotainment systems. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Regulator |
|---|---|
|
Use Scenario: Powering DSPs, display controllers, and audio codecs in vehicle head units supplied from 12V battery with load dump transients. IC Role / Device Role / Timing Role: Primary 3.3V/5V step-down regulator delivering clean, ripple-controlled power with fast transient response. Use Value: 2.2MHz operation avoids AM band interference; 40V abs max rating withstands 36V load dump; DA foldback sustains short-circuit survival. |
Use Scenario: Local regulation for 4–20mA loop-powered sensors or wireless IoT nodes in factory automation cabinets. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter converting 24V distributed supply to 3.3V MCU core voltage. Use Value: 3V–40V input range eliminates need for pre-regulator; 2mm × 2mm DFN fits tight spacing; <2µA shutdown enables battery backup. |
| Portable Medical Device Supply | Point-of-Load for FPGA I/O Banks |
|
Use Scenario: Battery-powered ultrasound or patient monitor subsystem requiring low-noise, reliable 5V rail from Li-ion or 24V wall adapter. IC Role / Device Role / Timing Role: Main DC/DC converter with soft-start to prevent inrush into large output capacitance. Use Value: SHDN pin enables hardware-controlled sequencing; 0.8V FB reference allows precise output setting; 125°C rating supports sealed enclosures. |
Use Scenario: Dedicated 3.3V supply for FPGA I/O banks in industrial control PLCs where EMI and thermal density are critical. IC Role / Device Role / Timing Role: High-frequency point-of-load regulator minimizing inductor size and board area near FPGA BGA. Use Value: 2.2MHz switching permits ≤6.8µH inductors; internal compensation removes tuning effort; exposed pad aids thermal management. |
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#TRMPBF | 1.1MHz switching frequency; 0.8V FB; same 3V–40V input, 500mA output; lower frequency increases inductor size but reduces EMI at sensitive bands. | Better suited for noise-sensitive analog signal chains where 2.2MHz harmonics may couple; less optimal for ultra-compact layouts. | Select LT3502EDC#TRMPBF when EMI filtering priority outweighs board area constraints and AM-band avoidance is not required. |
| MP2307DN-LF-Z | 1.2MHz frequency; 2A output; 4.5V–26V input; no DA foldback or internal boost diode; requires external bootstrap diode and compensation. | Higher current capability for multi-rail systems; lacks automotive-grade temp range (–40°C to 125°C) and fault protection sophistication of LT3502A. | Choose MP2307DN-LF-Z only for cost-driven, non-automotive applications needing >500mA with relaxed thermal and reliability requirements. |
Compared with LT3502EDC#TRMPBF and MP2307DN-LF-Z, the LT3502AEDC#TRMPBF uniquely combines 2.2MHz operation for minimal passive size, DA-based fault foldback for robust short-circuit handling, and automotive-grade thermal qualification - making it optimal for space-constrained, safety-aware embedded power rails.
Availability
LT3502AEDC#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and portable medical devices requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT3502AEDC#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3502/LT3502A product line was designed specifically for high-input-voltage, space-constrained DC/DC conversion in automotive and industrial environments - emphasizing fault resilience, thermal efficiency, and AM-band–free operation.
FAQ
What is the maximum input voltage the LT3502AEDC#TRMPBF can safely handle?
The LT3502AEDC#TRMPBF has an absolute maximum VIN rating of 40V and BOOST pin rating of 50V. For continuous fixed-frequency operation, maximum input depends on output voltage and minimum duty cycle (0.15 for LT3502A), but transient spikes up to 40V are tolerated. Exceeding 40V risks permanent damage per Absolute Maximum Ratings.
Does the LT3502AEDC#TRMPBF require an external bootstrap diode?
No. The LT3502AEDC#TRMPBF integrates a Schottky boost diode connected between BD and BOOST pins. This eliminates the need for an external diode in standard configurations, reducing component count and PCB area - a key differentiator versus most competing buck regulators.
How does the DA pin protect the LT3502AEDC#TRMPBF during output short-circuit events?
The DA pin monitors catch diode anode current. When valley current exceeds 650mA, the LT3502AEDC#TRMPBF initiates frequency foldback - reducing switching frequency to maintain that 650mA limit. This prevents thermal runaway and enables safe, sustained short-circuit operation without external current-limit circuitry.
Can the LT3502AEDC#TRMPBF be used to generate 3.3V from a 40V input?
Yes, but with caveats. At 40V input and 3.3V output, the LT3502AEDC#TRMPBF enters pulse-skipping mode due to minimum on-time (60ns) limitation, increasing output ripple. It remains functional and safe if output capacitors and inductor are rated for the higher ripple and voltage stress - confirmed in Typical Performance Characteristics (Figures G16–G17).
What is the purpose of the exposed pad (Pin 9) on the LT3502AEDC#TRMPBF DFN package?
The exposed pad (Pin 9) is electrically and thermally connected to GND. It must be soldered to a PCB copper pour for thermal dissipation - achieving the specified θJA = 102°C/W. Omitting this connection degrades thermal performance, limits output current, and risks exceeding 125°C junction temperature under load.
LT3502AEDC#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):
- 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#TRMPBF FAQ
1.How can I place an order for LT3502AEDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3502AEDC#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 LT3502AEDC#TRMPBF reliable?
The price and inventory of LT3502AEDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3502AEDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3502AEDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3502AEDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3502AEDC#TRMPBF?
LT3502AEDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3502AEDC#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 LT3502AEDC#TRMPBF?
For technical support, including LT3502AEDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3502AEDC#TRMPBF requirements.
6.How does Aetrix verify that LT3502AEDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3502AEDC#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 LT3502AEDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3502AEDC#TRMPBF?
All LT3502AEDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3502AEDC#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 LT3502AEDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT3502AEDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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