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Analog Devices Inc. LT3502AIMS#TRPBF
- Part No.:
- LT3502AIMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3502AIMS#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,014
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Product details
Overview
LT3502AIMS#TRPBF from Analog Devices (formerly Linear Technology) is a 2.2MHz, 500mA current-mode PWM step-down DC/DC converter with integrated bipolar NPN power switch and internal boost diode, designed for compact 3V–40V input automotive and industrial power regulation. It delivers regulated 3.3V or 5V output in thermally enhanced 10-lead MSOP package, supports soft-start and frequency foldback, and operates robustly under short-circuit conditions.
For engineers reviewing the LT3502AIMS#TRPBF datasheet, LT3502AIMS#TRPBF pinout, LT3502AIMS#TRPBF application, or LT3502AIMS#TRPBF equivalent, this page provides verified specifications, validated pin functions, confirmed automotive-grade thermal performance (–40°C to 125°C), and real-world design constraints including minimum on-time (60ns), DA valley current limit (650mA), and BOOST pin voltage margin (≥2.2V above SW).
Technical Context
The LT3502AIMS#TRPBF implements constant-frequency current-mode control with cycle-by-cycle peak current limiting and DA-pin-triggered frequency foldback to manage fault currents. Its oscillator runs at 2.2MHz (LT3502A variant), enabling sub-2mm inductor use and AM-band avoidance.
Internal architecture includes an undervoltage lockout (~2.8V), 0.8V feedback reference with ±13mV tolerance over temperature, and a dedicated DA pin that monitors catch diode valley current to reduce switching frequency when exceeding 650mA - a key differentiator from the 1.1MHz LT3502 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.2MHz - enables use of ≤6.8µH inductors and avoids AM radio interference. |
| Max Output Current | 500mA continuous - limited by internal 500mA bipolar switch and thermal derating in MSOP package. |
| Input Voltage Range | 3V to 40V - supports 24V industrial rails and 12V/24V automotive batteries with transient tolerance up to 40V. |
| Feedback Voltage | 0.8V ±13mV - sets output via resistor divider; R2 = 10kΩ recommended for accuracy. |
| Shutdown Current | <2µA - enables ultra-low-power system sleep modes without external disconnect. |
| Minimum On-Time | 60ns - defines practical VIN(MAX) limit (e.g., ~33V for 3.3VOUT) before pulse-skipping increases ripple. |
| DA Valley Current Limit | 650mA - triggers frequency foldback during overload/short-circuit to limit power dissipation and maintain stability. |
Pinout & Package
LT3502AIMS#TRPBF uses a 10-lead plastic MSOP package (θJA = 110°C/W), with exposed pad connected to GND for thermal enhancement. Pin numbering follows top-view MS package layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 10) | Main power input | Supplies internal regulator and switch; requires local 1µF ceramic bypass. |
| BD (Pin 8) | Boost diode anode connection | Provides current path to internal Schottky; ties to BOOST capacitor positive terminal. |
| FB (Pin 7) | Feedback sense node | Regulated to 0.8V; connects to resistor divider tap for VOUT programming. |
| SHDN (Pin 6) | Shutdown and soft-start control | Logic-high (>2V) enables operation; RC network here implements controlled start-up ramp. |
| GND (Pin 5) | Power and signal ground | Common return for all circuits; exposed pad must be soldered to PCB ground plane. |
| DA (Pin 4) | Catch diode anode monitor | Detects valley current in external diode; initiates frequency foldback above 650mA. |
| BOOST (Pin 2) | Switch driver bootstrap supply | Must be ≥2.2V above SW pin; driven by external capacitor + internal diode for full switch saturation. |
| SW (Pin 1) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt pulses. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky, reducing BOM count and PCB area in space-constrained designs. |
| 2.2MHz fixed switching frequency | Enables <6.8µH inductors and 10µF output capacitors - critical for automotive EMI compliance and board space savings. |
| DA-pin frequency foldback | Reduces switching frequency under short-circuit to limit average power and prevent thermal runaway without external circuitry. |
| Soft-start via SHDN pin | RC-controlled voltage ramp on SHDN limits inrush current and prevents input rail collapse during cold start. |
| Thermally enhanced MSOP | 10-lead MSOP with exposed pad achieves θJA = 110°C/W - supports 500mA load at 85°C ambient without heatsink. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Regulator |
|---|---|
Use Scenario: Powering 3.3V microcontroller, CAN transceiver, and display backlight from 12V battery with engine cranking dips and load dump transients. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3V rail with fast transient response and short-circuit robustness. Use Value: 2.2MHz operation avoids AM band; DA foldback sustains regulation during sustained shorts; 40V abs max rating handles 35V load dump. |
Use Scenario: Converting 24V factory bus to 5V for low-power PLC I/O modules operating in –40°C to 85°C environments. IC Role / Device Role / Timing Role: Compact, high-VIN step-down converter delivering regulated 5V with minimal external components. Use Value: 3V–40V input range covers brownout and overvoltage conditions; MSOP package fits dense industrial PCB layouts. |
| Portable Medical Device Supply | Smart Building Controller Rail |
Use Scenario: Generating 3.3V from dual-cell Li-ion (6–8.4V) or wall adapter (9–12V) for Bluetooth LE module and analog front-end in handheld diagnostic tool. IC Role / Device Role / Timing Role: Efficient, low-noise DC/DC converter with soft-start to prevent reset glitches during battery insertion. Use Value: <2µA shutdown current extends battery life; 60ns min on-time supports high VIN/VOUT ratios without pulse-skipping artifacts. |
Use Scenario: Providing isolated 5V rail for Zigbee/Wi-Fi SoC and sensor interface in HVAC controller powered from 24VAC rectified supply. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with internal compensation and thermal protection. Use Value: Internally compensated loop reduces design risk; –40°C to 125°C rating ensures reliability in unconditioned mechanical rooms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502IMS#TRPBF | 1.1MHz switching frequency, 90% max duty cycle vs. LT3502AIMS#TRPBF's 2.2MHz and 80%. | Better suited for higher VIN/VOUT ratios (e.g., 24V→5V) where lower frequency improves efficiency; less suitable for ultra-compact layouts. | Select LT3502IMS#TRPBF when minimizing inductor size is secondary to peak efficiency at medium loads. |
| MP2451DT-LF-Z | Monolithic 2A buck with 2MHz frequency but no DA-foldback; requires external catch diode; 36V max VIN. | Lacks integrated boost diode and DA-based fault management - needs additional components for short-circuit robustness. | Choose MP2451DT-LF-Z only if higher output current (2A) is required and fault protection can be implemented externally. |
Compared with LT3502IMS#TRPBF and MP2451DT-LF-Z, the LT3502AIMS#TRPBF uniquely combines 2.2MHz operation, integrated boost diode, and DA-triggered frequency foldback in a 10-lead MSOP - making it optimal for space-constrained automotive and industrial 500mA rails requiring inherent short-circuit resilience.
Availability
LT3502AIMS#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, portable medical devices, and smart building controllers requiring stable component supply across extended temperature ranges.
Supply support for LT3502AIMS#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 precision power portfolio with rigorous automotive qualification standards and long-term product longevity commitments.
The LT3502A series was engineered specifically for high-input-voltage, compact-footprint DC/DC conversion in harsh environments - emphasizing fault resilience, thermal performance, and AM-band immunity for automotive and industrial use.
FAQ
What is the maximum input voltage for continuous 2.2MHz operation of the LT3502AIMS#TRPBF?
The LT3502AIMS#TRPBF maintains fixed 2.2MHz operation up to ~33V input when regulating 3.3V output, based on its 80% maximum duty cycle and 60ns minimum on-time. Above this, pulse-skipping occurs - increasing output ripple but not damaging the device. Absolute maximum VIN remains 40V per datasheet ratings.
Does the LT3502AIMS#TRPBF require an external catch diode, and what are the key selection criteria?
Yes, the LT3502AIMS#TRPBF requires an external Schottky catch diode connected between SW and DA pins. Diodes must withstand ≥40V reverse voltage, handle ≥500mA average current, and exhibit low capacitance and forward drop (e.g., Diodes Inc. DFLS140 or ON Semi MBRM140). The DA pin monitors its anode current to trigger frequency foldback.
How does the DA pin function differ between LT3502AIMS#TRPBF and LT3502IMS#TRPBF?
Both variants use the DA pin to monitor catch diode valley current and initiate frequency foldback at 650mA. However, the LT3502AIMS#TRPBF's higher 2.2MHz frequency makes DA foldback more responsive under rapid fault onset, while the LT3502IMS#TRPBF's 1.1MHz operation yields slower foldback but higher light-load efficiency.
Can the LT3502AIMS#TRPBF operate without the BOOST capacitor, and what happens if BOOST voltage falls below specification?
No - the BOOST capacitor is mandatory. Without it, the internal bipolar switch cannot saturate fully, causing excessive VCE(SAT), reduced efficiency, and thermal stress. If BOOST voltage drops below 2.2V above SW, the switch enters linear region, increasing power loss and potentially triggering thermal shutdown during sustained 500mA loads.
Is the LT3502AIMS#TRPBF pin-compatible with other LT3502/LT3502A variants in MSOP packages?
Yes - all LT3502A variants in 10-lead MSOP (e.g., LT3502AEMS#TRPBF, LT3502AIMS#PBF, LT3502AIMS#TRPBF) share identical pinout, footprint, and thermal pad configuration. Only electrical differences (frequency, temp grade) distinguish them; no PCB redesign is needed when substituting within the A-grade MSOP family.
LT3502AIMS#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):
- 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:
- 10-MSOP
LT3502AIMS#TRPBF FAQ
1.How can I place an order for LT3502AIMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3502AIMS#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 LT3502AIMS#TRPBF reliable?
The price and inventory of LT3502AIMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3502AIMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3502AIMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3502AIMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3502AIMS#TRPBF?
LT3502AIMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3502AIMS#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 LT3502AIMS#TRPBF?
For technical support, including LT3502AIMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3502AIMS#TRPBF requirements.
6.How does Aetrix verify that LT3502AIMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3502AIMS#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 LT3502AIMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3502AIMS#TRPBF?
All LT3502AIMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3502AIMS#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 LT3502AIMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3502AIMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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