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Analog Devices Inc. LT3502AEMS#TRPBF
- Part No.:
- LT3502AEMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3502AEMS#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,220
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Product details
Overview
LT3502AEMS#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 cycle-by-cycle current limiting. It operates from 3V to 40V input and delivers regulated 3.3V or 5V outputs in automotive battery and industrial 24V supply systems.
For engineers reviewing the LT3502AEMS#TRPBF datasheet, LT3502AEMS#TRPBF pinout, LT3502AEMS#TRPBF application, or LT3502AEMS#TRPBF equivalent, key selection criteria include its 2.2MHz switching frequency for compact magnetics, 0.8V FB threshold for precise output programming, thermally enhanced MSOP-10 package, short-circuit robustness via DA valley current foldback, and <2µA shutdown current for low-power standby.
Technical Context
The LT3502AEMS#TRPBF uses constant-frequency current-mode control with slope compensation and an internal 0.8V error amplifier reference. Its oscillator drives an RS flip-flop to control the bipolar NPN switch, while the DA pin monitors catch diode valley current to trigger frequency foldback during overload or short-circuit events.
Soft-start is implemented by ramping the SHDN pin voltage externally, which simultaneously clamps the VC node and reduces oscillator frequency to limit inrush. The internal boost circuit-comprising the BOOST pin, internal Schottky diode, and external capacitor-generates a gate drive voltage >VIN to fully saturate the NPN switch for high efficiency at high input voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.2MHz - enables use of sub-10µH inductors and 0402/0603 capacitors; places switching noise above AM band. |
| Input Voltage Range | 3V to 40V - supports direct connection to automotive batteries (9–16V) and industrial 24V rails without pre-regulation. |
| Output Current | 500mA continuous - sustained delivery with thermal derating in MSOP-10 package at ≤125°C junction temperature. |
| Feedback Reference | 0.8V ±13mV - sets output voltage via resistor divider (e.g., 3.3V = 0.8V × (1 + R1/R2)); enables accurate, low-drift regulation. |
| Shutdown Current | <2µA - allows ultra-low quiescent power in battery-backed or always-on systems requiring long sleep duration. |
| Current Limit Threshold | 0.75A to 1.1A peak switch current - provides overcurrent protection with duty-cycle-dependent slope compensation. |
| DA Valley Current Limit | 650mA - triggers frequency foldback to limit inductor valley current during short-circuit, preventing thermal runaway. |
Pinout & Package
LT3502AEMS#TRPBF is housed in a thermally enhanced 10-lead plastic MSOP package (3mm × 3mm × 1.1mm), with exposed pad soldered to PCB ground for θJA = 110°C/W. Pin 5 is GND; exposed pad (not numbered) must be connected to system ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 10) | Power input | Supplies internal regulator and switch; requires local 1µF X7R ceramic bypass close to pin. |
| BD (Pin 8) | Boost diode anode | Connects to external boost capacitor; internal Schottky diode charges BOOST pin above SW. |
| FB (Pin 7) | Feedback sense | Regulated to 0.8V; sets VOUT = 0.8V × (1 + R1/R2); bias current ≤50nA minimizes divider error. |
| SHDN (Pin 6) | Enable/soft-start control | Logic-high ≥2V enables operation; tied to RC network for controlled startup and frequency foldback. |
| GND (Pin 5) | Power and signal ground | Common return for internal circuits, switch emitter, and exposed pad; must be low-impedance. |
| DA (Pin 4) | Diode anode monitor | Detects catch diode conduction; initiates frequency foldback when valley current exceeds 650mA. |
| BOOST (Pin 2) | Switch gate drive boost | Driven ~2.2V above SW to fully saturate NPN switch; requires 0.1µF ceramic capacitor to SW. |
| SW (Pin 1) | Switch collector output | Connects to inductor, catch diode cathode, and BOOST capacitor; carries pulsed 500mA switch current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode, reducing BOM count and PCB area in MSOP-10 layout. |
| 2.2MHz fixed-frequency operation | Enables use of 6.8µH inductors and 10µF ceramic output caps for 3.3V/500mA designs under 25mm² footprint. |
| DA pin frequency foldback | Reduces switching frequency during overload to hold inductor valley current at 650mA, limiting power dissipation. |
| Internally compensated | Requires no external compensation components; simplifies design and improves stability across load/line variations. |
| Thermally enhanced MSOP-10 | Exposed pad and optimized die attach enable 500mA continuous output at TJ ≤125°C without heatsink. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Regulator |
|---|---|
|
Use Scenario: Powering 3.3V microcontroller, CAN transceiver, and display driver in head unit under 12V battery with cold-crank dips to 6V. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V at up to 500mA; handles 40V load-dump transients via VIN rating. Use Value: 2.2MHz operation avoids AM band interference; DA foldback prevents thermal failure during ECU reset-induced shorts. |
Use Scenario: Regulating 5V from 24V factory bus to power low-power wireless sensor MCU and RF module. IC Role / Device Role / Timing Role: Compact, high-input buck converter with <2µA shutdown for energy harvesting-compatible wake-up cycles. Use Value: 3V–40V range eliminates need for upstream pre-regulator; MSOP-10 footprint fits dense IoT node PCBs. |
| Medical Portable Device Supply | Test Equipment Auxiliary Rail |
|
Use Scenario: Generating isolated 5V rail from Li-ion battery pack (8–12.6V) for analog front-end and ADC in handheld diagnostic tool. IC Role / Device Role / Timing Role: Efficient step-down regulator with soft-start (via SHDN RC) to prevent input surge during battery insertion. Use Value: 0.8V FB reference enables precise 5V output with 1% resistors; <2µA shutdown extends battery life between measurements. |
Use Scenario: Providing clean 3.3V supply to FPGA configuration memory and interface logic in benchtop analyzer with 24V backplane. IC Role / Device Role / Timing Role: Secondary point-of-load regulator immune to backplane ripple due to high PSRR at 2.2MHz. Use Value: Internal compensation ensures stable loop response without tuning; 500mA headroom supports future firmware expansion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502EMS#TRPBF | 1.1MHz switching frequency; 0.8V FB; same pinout and package; lower frequency increases inductor size but improves light-load efficiency. | Suitable where EMI filtering is prioritized over board space; not recommended for AM-band-sensitive automotive audio systems. | Select LT3502EMS#TRPBF only if 1.1MHz operation meets system noise requirements and larger magnetics are acceptable. |
| MP2307DN-LF-Z | 1.2MHz frequency; 2A switch; no DA foldback; requires external bootstrap diode; 0.8V FB; SOIC-8 package. | Lacks valley-current-based short-circuit protection; higher current rating suits higher load demands but increases solution size. | Choose MP2307DN-LF-Z only when >500mA output is required and DA foldback is not critical for fault robustness. |
Compared with LT3502EMS#TRPBF and MP2307DN-LF-Z, the LT3502AEMS#TRPBF offers superior short-circuit resilience via DA pin foldback and smallest possible passive component footprint due to 2.2MHz operation-critical for space-constrained automotive and portable designs.
Availability
LT3502AEMS#TRPBF 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 full traceability.
Supply support for LT3502AEMS#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 full product support, datasheets, and application engineering for legacy Linear regulators including the LT3502A family.
The LT3502A series was designed for high-input-voltage, space-constrained DC/DC conversion in automotive, industrial, and portable equipment-emphasizing fault robustness, small solution size, and wide VIN operation without pre-regulators.
FAQ
What is the maximum input voltage rating for LT3502AEMS#TRPBF?
The absolute maximum input voltage for LT3502AEMS#TRPBF is 40V on the VIN pin, and 50V on the BOOST pin. Continuous operation above 40V violates the absolute maximum rating and risks permanent damage. For fixed-frequency operation, the practical maximum input depends on output voltage and minimum duty cycle-e.g., at 3.3V output, VIN(MAX) ≈ 30V for stable regulation without pulse-skipping.
Does LT3502AEMS#TRPBF require an external bootstrap diode?
No, LT3502AEMS#TRPBF integrates a bootstrap Schottky diode connected between BD and BOOST pins. This eliminates the need for an external diode, reducing component count and PCB area. The internal diode supports typical boost capacitor values of 0.1µF and enables efficient NPN switch saturation across the full 3V–40V input range.
How does the DA pin protect LT3502AEMS#TRPBF during output short-circuit?
The DA pin monitors catch diode conduction and triggers frequency foldback when valley current exceeds 650mA. During a short, LT3502AEMS#TRPBF reduces switching frequency to maintain this valley current limit-lowering average power dissipation and preventing thermal runaway. This complements the 0.75–1.1A peak switch current limit for comprehensive fault protection.
Can LT3502AEMS#TRPBF operate with a 3.3V input voltage?
LT3502AEMS#TRPBF has a 3V undervoltage lockout threshold, so it will not start or regulate reliably below ~3V. At exactly 3.3V input, operation is only possible for VOUT ≤ 2.5V (accounting for switch drop and diode loss). For 3.3V output, minimum practical input is ~4.2V due to duty cycle and dropout constraints-verified in Figure 6a of the datasheet.
What is the thermal performance of LT3502AEMS#TRPBF in MSOP-10 package?
LT3502AEMS#TRPBF in MSOP-10 has θJA = 110°C/W with standard JEDEC 2S2P copper layers. With the exposed pad soldered to a 1cm² ground plane, it delivers 500mA continuously at ambient ≤85°C. Derating begins above 85°C ambient, and maximum junction temperature is 125°C-validated across –40°C to 125°C operating range per datasheet specifications.
LT3502AEMS#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
LT3502AEMS#TRPBF FAQ
1.How can I place an order for LT3502AEMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3502AEMS#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 LT3502AEMS#TRPBF reliable?
The price and inventory of LT3502AEMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3502AEMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3502AEMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3502AEMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3502AEMS#TRPBF?
LT3502AEMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3502AEMS#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 LT3502AEMS#TRPBF?
For technical support, including LT3502AEMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3502AEMS#TRPBF requirements.
6.How does Aetrix verify that LT3502AEMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3502AEMS#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 LT3502AEMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3502AEMS#TRPBF?
All LT3502AEMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3502AEMS#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 LT3502AEMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3502AEMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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