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Analog Devices Inc. LT3502AIDC#TRMPBF
- Part No.:
- LT3502AIDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3502AIDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,535
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Product details
Overview
LT3502AIDC#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 thermal enhancement in an 8-lead 2mm × 2mm DFN package. It operates from 3V to 40V input and delivers regulated 3.3V or 5V outputs for automotive battery systems and industrial distributed supplies.
For engineers reviewing the LT3502AIDC#TRMPBF datasheet, LT3502AIDC#TRMPBF pinout, LT3502AIDC#TRMPBF application, or LT3502AIDC#TRMPBF equivalent, key selection criteria include its 2.2MHz switching frequency enabling compact magnetics, 0.8V FB voltage for precise output setting, <2µA shutdown current for low-power systems, cycle-by-cycle current limit, and DA-pin-based frequency foldback for short-circuit robustness.
Technical Context
The LT3502AIDC#TRMPBF uses constant-frequency current-mode control with an internal oscillator driving an RS flip-flop to gate the bipolar NPN switch. Its error amplifier servo-controls the VC node to regulate the FB pin at 0.8V, while slope compensation prevents subharmonic oscillation above 50% duty cycle.
Protection architecture includes cycle-by-cycle peak switch current limiting (typ. 0.9A), DA-pin valley current monitoring (650mA threshold) triggering frequency foldback, soft-start via SHDN pin ramping, and undervoltage lockout (~2.8V). The internal boost diode charges the BOOST capacitor to provide >VIN drive voltage for full switch saturation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.2MHz - enables use of sub-10µH inductors and 1–10µF ceramic output capacitors, minimizing solution size and avoiding AM-band interference. |
| Input Voltage Range | 3V to 40V - supports direct regulation from 24V industrial rails and 12V/24V automotive batteries with cold-crank margin. |
| Output Current | 500mA continuous - sustained delivery under thermal limits in the 2mm × 2mm DFN package with exposed pad soldered to PCB. |
| Feedback Voltage | 0.8V ±13mV - sets output via resistor divider (e.g., R2 = 10kΩ, R1 = 32.4kΩ for 3.3V); low tolerance enables accurate regulation without trimming. |
| Shutdown Current | <2µA - allows ultra-low quiescent power in always-on automotive modules or battery-backed systems. |
| Current Limit Threshold | 0.75A to 1.1A - peak switch current limit with slope compensation; combined with 650mA DA-valley limit ensures fault containment during output shorts. |
| Package Thermal Resistance | θJA = 102°C/W - requires exposed pad soldered to PCB ground plane for reliable operation at full load across –40°C to 125°C junction range. |
Pinout & Package
LT3502AIDC#TRMPBF is housed in an 8-lead, 2mm × 2mm plastic DFN package with exposed thermal pad (Pin 9) that must be soldered to PCB ground for thermal performance. Pin numbering follows top-view layout with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input supply | Supplies internal regulator and power switch; requires local 1µF X7R/X5R ceramic bypass; absolute max 40V. |
| BD (Pin 2) | Boost diode anode connection | Connects to external boost capacitor; internal Schottky diode provides charge path; BD voltage must stay ≤7V. |
| FB (Pin 3) | Feedback reference input | Servo-regulated to 0.8V; sets VOUT = 0.8V × (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 voltage-ramped soft-start and frequency foldback. |
| GND (Pin 5) | Power and signal ground | Common return for internal circuitry, switch emitter, and exposed thermal pad; must be low-impedance PCB connection. |
| DA (Pin 6) | Diode anode current sense | Monitors catch diode valley current; triggers frequency foldback when >650mA to limit fault energy during short circuits. |
| BOOST (Pin 7) | Switch driver bootstrap supply | Driven ~2.2V above SW by internal diode + external capacitor; enables full saturation of bipolar NPN switch. |
| SW (Pin 8) | Switch collector output | Drives external inductor and catch diode; connects to BOOST capacitor; voltage swings from GND to VIN + VBOOST. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Diode | Eliminates external Schottky diode in boost path, reducing BOM count and PCB area while maintaining efficient bipolar switch drive. |
| DA-Pin Frequency Foldback | Reduces switching frequency under overload or short-circuit conditions to hold valley current at 650mA, limiting power dissipation and thermal stress. |
| Internally Compensated Loop | Requires no external compensation components - simplifies design, reduces layout sensitivity, and guarantees stability with recommended output capacitor values. |
| Thermally Enhanced DFN | 2mm × 2mm footprint with exposed GND pad achieves θJA = 102°C/W - enables 500mA output in space-constrained automotive and industrial modules. |
| AM-Band Immune Switching | 2.2MHz fixed frequency places fundamental and harmonics well above 1.6MHz AM radio band, preventing audible interference in infotainment systems. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering 3.3V microcontrollers, CAN transceivers, and display drivers in head units or ADAS ECUs where EMI and space are critical. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator converting 12V/24V battery rail; provides clean, low-noise supply with fast transient response. Use Value: 2.2MHz operation avoids AM-band noise coupling; <2µA shutdown current extends battery life during vehicle sleep mode. | Use Scenario: Regulating 5V or 3.3V for wireless sensor nodes deployed in factory automation or process control cabinets with 24V DC distribution. IC Role / Device Role / Timing Role: Point-of-load DC/DC converter delivering stable output despite wide input variation (e.g., 18–32V) and temperature extremes. Use Value: 3V–40V input range accommodates brownout and surge conditions; –40°C to 125°C guaranteed operation ensures reliability in uncontrolled environments. |
| Portable Test Equipment | Smart Actuator Control Module |
Use Scenario: Powering FPGA I/O banks and ADC front-ends in handheld multimeters or oscilloscope probes requiring low-noise, compact power. IC Role / Device Role / Timing Role: High-frequency buck converter supplying precision analog and digital domains from single Li-ion or wall adapter input. Use Value: Tiny 2mm × 2mm DFN and 10µF output cap enable <100mm² total solution size; internally compensated loop eases layout for mixed-signal designs. | Use Scenario: Providing 5V logic supply and 3.3V MCU core voltage in motor-driven HVAC or valve actuators exposed to vibration and thermal cycling. IC Role / Device Role / Timing Role: Robust primary regulator handling load dumps and reverse-battery transients via built-in protection features. Use Value: Cycle-by-cycle current limit and DA-foldback survive shorted solenoid windings; exposed-pad DFN maintains thermal margin under continuous 500mA load. |
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 | Same silicon, E-grade (0°C to 125°C junction), identical electrical specs and pinout. | Not qualified for full –40°C start-up; unsuitable for cold-weather automotive or outdoor industrial use. | Select LT3502AIDC#TRMPBF when guaranteed operation below 0°C is required; E-grade is lower-cost alternative for benign environments. |
| LT3502AIMS#TRPBF | Same functionality in 10-lead MSOP package; θJA = 110°C/W; requires larger PCB area and different layout. | Offers easier hand-soldering and thermal inspection but sacrifices miniaturization; less suitable for ultra-dense modules. | Choose LT3502AIMS#TRPBF only if DFN assembly capability is unavailable or thermal monitoring access is prioritized over size. |
Compared with LT3502AEDC#TRPBF and LT3502AIMS#TRPBF, the LT3502AIDC#TRMPBF uniquely combines –40°C guaranteed operation, smallest 2mm × 2mm footprint, and lowest thermal resistance among LT3502A variants-making it optimal for space- and temperature-constrained automotive and industrial deployments.
Availability
LT3502AIDC#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3502AIDC#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 LT3502A product line delivers compact, high-voltage buck regulators optimized for harsh-environment applications where wide input range, small solution size, and robust fault protection are mandatory.
FAQ
What is the guaranteed operating temperature range for the LT3502AIDC#TRMPBF?
The LT3502AIDC#TRMPBF is specified and guaranteed over the full –40°C to 125°C junction temperature range. This is confirmed by characterization and statistical process controls per Linear Technology's datasheet Note 2, making it suitable for under-hood automotive and industrial control applications where ambient extremes occur.
Does the LT3502AIDC#TRMPBF require an external boost diode?
No, the LT3502AIDC#TRMPBF integrates a Schottky boost diode between the BD and BOOST pins. This eliminates the need for an external diode in the bootstrap path, reducing component count and PCB area while maintaining efficient drive of the internal bipolar NPN switch.
How does the DA pin protect the LT3502AIDC#TRMPBF during output short circuits?
The DA pin monitors valley current through the external catch diode. When this current exceeds 650mA, the LT3502AIDC#TRMPBF initiates frequency foldback-reducing switching frequency to maintain safe power dissipation and prevent thermal runaway during sustained short-circuit events.
Can the LT3502AIDC#TRMPBF be used with a 3.3V input supply?
No-the LT3502AIDC#TRMPBF has an undervoltage lockout threshold of ~2.8V minimum, but stable regulation requires ≥3V input. At exactly 3.3V input, output regulation is only possible for VOUT ≤ ~2.5V due to switch drop and duty cycle limits; for 3.3V or 5V outputs, minimum practical VIN is ~4.5V.
What is the purpose of the exposed thermal pad on the LT3502AIDC#TRMPBF DFN package?
The exposed thermal pad (Pin 9) on the LT3502AIDC#TRMPBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve the specified θJA = 102°C/W and sustain 500mA output current across the full –40°C to 125°C temperature range without derating.
LT3502AIDC#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)
LT3502AIDC#TRMPBF FAQ
1.How can I place an order for LT3502AIDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3502AIDC#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 LT3502AIDC#TRMPBF reliable?
The price and inventory of LT3502AIDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3502AIDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3502AIDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3502AIDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3502AIDC#TRMPBF?
LT3502AIDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3502AIDC#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 LT3502AIDC#TRMPBF?
For technical support, including LT3502AIDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3502AIDC#TRMPBF requirements.
6.How does Aetrix verify that LT3502AIDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3502AIDC#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 LT3502AIDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3502AIDC#TRMPBF?
All LT3502AIDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3502AIDC#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 LT3502AIDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT3502AIDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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