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Analog Devices Inc. LT3502IMS#TRPBF
- Part No.:
- LT3502IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3502IMS#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,740
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Product details
Overview
LT3502IMS#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode PWM step-down DC/DC converter with an integrated 500mA bipolar NPN power switch, designed for industrial and automotive power regulation. It operates from 3V to 40V input, delivers up to 500mA output, switches at 1.1MHz (LT3502 variant), features 0.8V feedback reference, internal boost diode, and thermally enhanced 10-lead MSOP package. It is used in 24V industrial supplies and battery-powered systems requiring compact, robust buck conversion.
For engineers reviewing the LT3502IMS#TRPBF datasheet, LT3502IMS#TRPBF pinout, LT3502IMS#TRPBF application, or LT3502IMS#TRPBF equivalent, key selection criteria include input voltage range (3–40V), switching frequency (1.1MHz), output current capability (500mA), feedback voltage (0.8V), and thermal performance in the MSOP package - all critical for automotive and industrial supply designs where EMI, board space, and reliability are constrained.
Technical Context
The LT3502IMS#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 a bipolar NPN switch driven from VIN or BOOST pin, where an external capacitor and internal Schottky diode generate a boosted gate drive voltage ≥2.2V above SW. Frequency foldback and DA-pin valley-current sensing (650mA limit) provide fault protection during short-circuit or high-VIN overload conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports 24V industrial rails and automotive batteries without external pre-regulation. |
| Output Current | 500mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switching Frequency | 1.1MHz - enables use of small, low-cost 6.8µH inductors and reduces EMI above AM band. |
| Feedback Voltage | 0.8V ±13mV - sets precise output via resistor divider; allows 3.3V, 5V, or custom VOUT with <1% tolerance. |
| Shutdown Current | <2µA - minimizes battery drain in always-on or low-power wake-up systems. |
| Package Thermal Resistance | θJA = 110°C/W (MSOP) - requires PCB copper pour on exposed pad for reliable 125°C junction operation. |
| Current Limit Threshold | 0.75–1.1A peak switch current - provides overcurrent protection while allowing transient load surges. |
Pinout & Package
LT3502IMS#TRPBF is housed in a 10-lead plastic MSOP package (3mm × 3mm × 1.1mm) with exposed pad (GND-connected) for thermal enhancement. Pin 5 is GND; pins 1 and 10 are electrically connected to VIN internally but assigned separately for layout flexibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1 / Pin 10) | Main power input | Supplies internal regulator and power switch; must be locally bypassed with ≥1µF X7R ceramic capacitor. |
| BD (Pin 8) | Boost diode anode connection | Connects to external boost capacitor; ties to internal Schottky diode cathode for charge pump operation. |
| FB (Pin 7) | Feedback reference node | Regulated to 0.8V; sets output via R1/R2 divider; R2 = 10kΩ recommended for bias current error minimization. |
| SHDN (Pin 6) | Enable/soft-start control | Logic-high (>2V) enables operation; tied to VIN if unused; RC network here implements soft-start and frequency foldback. |
| GND (Pin 5) | Power and signal ground | Common return for internal circuitry and power switch; exposed pad must be soldered to PCB ground plane. |
| DA (Pin 4) | Diode anode sensing | Monitors catch diode current; triggers frequency foldback when valley current exceeds 650mA during faults. |
| BOOST (Pin 2) | Boost capacitor node | Must be ≥2.2V above SW pin; generates elevated drive voltage for full saturation of internal NPN switch. |
| SW (Pin 1) | 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 design and improves stability across load/line variations. |
| Internal boost diode | Reduces BOM count by one discrete Schottky diode; enables single-capacitor boost configuration in space-constrained layouts. |
| Cycle-by-cycle current limit | Prevents switch destruction during startup or overload by limiting peak inductor current to ≤1.1A under all conditions. |
| Soft-start via SHDN pin | External RC network ramps SHDN voltage, controlling VC node ramp rate and limiting inrush current to safe levels. |
| Frequency foldback protection | Automatically reduces switching frequency during short-circuit events to maintain 650mA valley current limit and prevent thermal runaway. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
|
Use Scenario: Regulating 12V or 24V vehicle battery to 3.3V/5V for MCU, CAN transceiver, and display logic in head units. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, low-noise, EMI-compliant power with AM-band avoidance (1.1MHz). Use Value: Enables compact, thermally robust design meeting AEC-Q200 stress requirements without external current-sense resistors or compensation networks. |
Use Scenario: Powering wireless sensor nodes (e.g., LoRaWAN, NB-IoT) from 24V factory bus or solar-charged battery. IC Role / Device Role / Timing Role: High-input-voltage step-down converter delivering 500mA at 3.3V with ultra-low shutdown current (<2µA). Use Value: Extends battery life in maintenance-free deployments while maintaining fast transient response via ceramic output capacitance. |
| Programmable Logic Controller (PLC) I/O Module | Medical Point-of-Care Device |
|
Use Scenario: Generating isolated or non-isolated 5V rail for digital I/O conditioning circuits in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Industrial-grade DC/DC converter operating continuously at –40°C to 125°C junction temperature. Use Value: Delivers reliable 500mA output across wide input transients (e.g., 24V ±20%) without derating, supported by robust short-circuit protection. |
Use Scenario: Providing regulated 3.3V for low-power ARM Cortex-M microcontroller and analog front-end in portable diagnostics equipment. IC Role / Device Role / Timing Role: Compact, internally compensated buck regulator minimizing PCB area and qualification effort for Class II medical devices. Use Value: Achieves >85% efficiency at 100–500mA loads with minimal thermal rise, supporting fanless enclosure design and IEC 60601 leakage compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502AEMS#TRPBF | 2.2MHz switching frequency, 80% max duty cycle, same pinout and package. | Better suited for ultra-compact designs needing smaller inductors; higher frequency increases light-load switching losses. | Select LT3502AEMS#TRPBF when board space is critical and EMI filtering can accommodate 2.2MHz harmonics. |
| LMR14050SQDDARQ1 | 500mA, 40V input, 2.1MHz, integrated MOSFET, automotive-grade (AEC-Q100 Grade 1). | Requires external compensation; no internal boost diode; uses MOSFET instead of bipolar switch. | Choose LMR14050SQDDARQ1 for new automotive designs requiring AEC-Q100 certification and higher light-load efficiency. |
Compared with LT3502IMS#TRPBF, LT3502AEMS#TRPBF offers higher frequency for smaller passives but reduced maximum duty cycle, while LMR14050SQDDARQ1 provides AEC-Q100 qualification and MOSFET efficiency at the cost of added external components and layout complexity.
Availability
LT3502IMS#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and medical point-of-care devices requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LT3502IMS#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 high-performance power management portfolio with rigorous qualification and long-term support.
The LT3502 series belongs to Linear's industrial-grade monolithic buck regulator product line, engineered for wide-input-voltage applications in harsh environments including automotive, factory automation, and medical equipment.
FAQ
What is the switching frequency of the LT3502IMS#TRPBF?
The LT3502IMS#TRPBF operates at a fixed 1.1MHz switching frequency. This frequency is inherent to the LT3502 variant (as opposed to the LT3502A's 2.2MHz) and is specified across the full –40°C to 125°C junction temperature range. It enables compact filter design while avoiding interference with AM radio bands, making LT3502IMS#TRPBF suitable for noise-sensitive automotive and industrial applications.
Does the LT3502IMS#TRPBF require an external catch diode?
Yes, the LT3502IMS#TRPBF requires an external Schottky catch diode connected between the SW and GND pins, with its anode tied to the DA pin. The device does not integrate a synchronous rectifier; instead, it relies on this external diode for discontinuous conduction mode operation and fault protection. Recommended parts include Diodes Inc. DFLS140 or ON Semiconductor MBRM140, rated for ≥40V reverse voltage and 500mA average current.
What is the purpose of the DA pin on the LT3502IMS#TRPBF?
The DA (Diode Anode) pin on the LT3502IMS#TRPBF senses current through the external catch diode and triggers frequency foldback when valley current exceeds 650mA. This protects the system during output short-circuit or overload by reducing switching frequency to maintain safe inductor current, preventing thermal runaway. It works in tandem with the internal peak current limit comparator to define the LT3502IMS#TRPBF's robust fault-handling behavior.
Can the LT3502IMS#TRPBF operate with a 2.5V input voltage?
No, the LT3502IMS#TRPBF cannot operate with a 2.5V input. Its undervoltage lockout (UVLO) activates below ~2.8V, and minimum functional input is 3V. Attempting to power LT3502IMS#TRPBF below this threshold prevents switching and may cause erratic behavior. For sub-3V inputs, a different regulator such as the LTC3642 or LT8609 must be selected.
Is the LT3502IMS#TRPBF pin-compatible with the LT3502AIMS#TRPBF?
Yes, the LT3502IMS#TRPBF is pin-compatible with the LT3502AIMS#TRPBF - both use identical 10-lead MSOP packages and share identical pin assignments and functions. However, they differ in switching frequency (1.1MHz vs. 2.2MHz), maximum duty cycle (90% vs. 80%), and current-limit thresholds. Substitution requires verification of loop stability and inductor sizing due to these parametric differences.
LT3502IMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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:
- 10-MSOP
LT3502IMS#TRPBF FAQ
1.How can I place an order for LT3502IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3502IMS#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 LT3502IMS#TRPBF reliable?
The price and inventory of LT3502IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3502IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3502IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3502IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3502IMS#TRPBF?
LT3502IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3502IMS#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 LT3502IMS#TRPBF?
For technical support, including LT3502IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3502IMS#TRPBF requirements.
6.How does Aetrix verify that LT3502IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3502IMS#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 LT3502IMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3502IMS#TRPBF?
All LT3502IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3502IMS#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 LT3502IMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3502IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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