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Analog Devices Inc. LT3509HMSE#TRPBF
- Part No.:
- LT3509HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3509HMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 700MA DL 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,474
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Product details
Overview
LT3509HMSE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, current-mode, synchronous step-down DC/DC regulator IC with integrated 700mA power switches per channel, 3.6V–36V input range, and independent RUN/SS control-designed for automotive and industrial multi-rail power systems requiring robust transient immunity up to 60V and operation at junction temperatures up to 150°C.
For engineers reviewing the LT3509HMSE#TRPBF datasheet, LT3509HMSE#TRPBF pinout, LT3509HMSE#TRPBF application, or LT3509HMSE#TRPBF equivalent, key selection considerations include its adjustable 300kHz–2.2MHz switching frequency, internal compensation and boost diodes, overvoltage lockout (38.5V typ), thermal shutdown, and MSOP-16 package with exposed pad for enhanced thermal performance in harsh environments.
Technical Context
The LT3509HMSE#TRPBF implements dual independent current-mode control loops sharing a common 0.8V reference and oscillator, enabling phase-aligned switching and synchronized frequency setting via RT resistor or external clock on SYNC pin. Each channel features cycle-by-cycle current limiting, soft-start via RUN/SS pins, and integrated boost diode (BD) driving external bootstrap capacitors for high-side switch gate drive above VIN.
Its protection architecture includes undervoltage lockout (~3.6V), overvoltage shutdown (~38.5V), thermal shutdown, and DA-pin-based valley-current limiting (0.95A typ) during short-circuit events. The device maintains constant-frequency operation across its full temperature range (–40°C to 150°C), with minimum on-time drift and stable feedback voltage (0.784–0.816V) over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V non-repetitive transients-enables direct connection to 12V/24V automotive batteries with surge protection. |
| Output Current per Channel | 700mA continuous-supports dual-core microcontrollers, FPGAs, or sensor subsystems without external pass devices. |
| Switching Frequency | Adjustable 300kHz to 2.2MHz via RT pin; synchronizable externally-allows AM-band avoidance (≥300kHz) and compact magnetics selection. |
| Feedback Reference Voltage | 0.8V ±2% over –40°C to 150°C-ensures accurate output regulation across automotive under-hood temperature extremes. |
| Overvoltage Lockout Threshold | 38.5V typical-protects internal switches and downstream circuitry during load-dump events in automotive applications. |
| Thermal Rating | Junction temperature range –40°C to 150°C-qualified for under-hood automotive use and high-ambient industrial control cabinets. |
| Shutdown Current | 9µA max at V(RUN/SS) < 0.3V-minimizes battery drain in always-on vehicle modules. |
Pinout & Package
LT3509HMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17 = GND), measuring 4.0mm × 3.0mm × 1.0mm. The exposed pad must be soldered to PCB ground for thermal and electrical integrity; θJA = 43°C/W, θJC = 4.3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DA1, DA2 (Pins 1, 8) | Catch diode anode sense terminals | Internally connected to GND via current-sense resistors; enable valley-current limiting and short-circuit protection per channel. |
| BOOST1, BOOST2 (Pins 2, 7) | Bootstrap capacitor connection points | Drive external capacitors to elevate gate drive above VIN-reducing dropout and improving efficiency at high duty cycles. |
| SW1, SW2 (Pins 3, 6) | Internal power switch outputs | Connect directly to inductors and catch diode cathodes; rated for 700mA continuous, 1.4A peak switch current. |
| VIN (Pins 4, 5) | Main input power supply | Dual pins must be tied together; accepts 3.6V–36V input and handles 60V transients-requires local ceramic input capacitance. |
| FB1, FB2 (Pins 16, 9) | Output voltage feedback inputs | Set regulated output via resistor divider; maintain 0.8V reference-enables precise 3.3V, 5V, or custom rail generation. |
| RUN/SS1, RUN/SS2 (Pins 15, 10) | Channel enable and soft-start control | 0.8V–2V range enables current-limited soft-start; <0.4V shuts down channel; internal 1µA pull-up allows floating-enable operation. |
| RT (Pin 11) | Oscillator timing resistor input | Single external resistor sets switching frequency from 300kHz to 2.2MHz-no external capacitor required. |
| SYNC (Pin 12) | External clock synchronization input | Accepts logic-level clock ≥12% above free-run frequency; threshold = 1.0V-enables EMI reduction and multi-converter phase alignment. |
| BD (Pin 13) | Common anode of internal Schottky boost diodes | Supplies charge current to BOOST capacitors; must be locally bypassed-enables self-contained bootstrap operation without external diodes. |
| AGND (Pin 14) | Analog ground reference | Separate low-noise return for control circuitry; must connect to main GND plane but not used as sole ground path for power components. |
| Exposed Pad (Pin 17) | Power and thermal ground | Electrically and thermally connected to internal GND; requires soldering and thermal vias for reliable 150°C operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators with shared reference | Enables tightly regulated, phase-aligned 3.3V/5V rails from single input-reduces component count and cross-regulation error. |
| Integrated boost diodes and compensation | Eliminates 4 external diodes and 2 compensation networks-simplifies layout and improves reliability in space-constrained automotive modules. |
| 95% maximum duty cycle capability | Supports ultra-low dropout operation (e.g., 5V out from 5.5V in)-critical for post-buck regulation after LDOs or in cold-crank scenarios. |
| Short-circuit robust valley-current limiting | Clamps inductor valley current to ~0.95A during output shorts-prevents thermal runaway while maintaining regulation on healthy channel. |
| Automotive-grade temperature qualification | Guaranteed operation from –40°C to 150°C junction-meets AEC-Q100 stress test requirements for engine control and ADAS power supplies. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for SoC (1.2V core), DDR memory (1.5V), and display interface (3.3V) in head-unit systems exposed to 12V battery with load-dump transients. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, regulated 3.3V and 5V rails with independent sequencing and fault isolation. Use Value: Withstands 60V transients and operates up to 150°C ambient-eliminates need for external TVS and derating margins in sealed enclosures. | Use Scenario: Powering microcontroller, analog front-end, and isolated CAN transceiver in DIN-rail mounted programmable logic controller operating in factory environments. IC Role / Device Role / Timing Role: Central point-of-load regulator delivering stable 3.3V and 5V from 24V industrial bus with high EMI immunity. Use Value: Adjustable switching frequency avoids noise coupling into sensitive analog measurements; SYNC pin enables coordinated switching with other converters. |
| Networking Edge Router | CPU/DSP Core Supply |
Use Scenario: Generating auxiliary 3.3V and 5V rails for PHYs, management MCU, and fan controllers in compact enterprise edge routers with limited board area. IC Role / Device Role / Timing Role: Compact dual-output buck regulator replacing discrete solutions-reducing BOM count and thermal footprint. Use Value: MSOP-16 package with exposed pad achieves >85% efficiency at 700mA per rail using 0.1µF ceramic boost caps-enabling fanless operation. | Use Scenario: Providing clean, sequenced 1.2V core and 3.3V I/O supplies for FPGA or DSP in embedded vision system with strict power-up timing. IC Role / Device Role / Timing Role: Dual-channel regulator with independent RUN/SS pins enabling controlled power sequencing and brown-out recovery. Use Value: Soft-start ramp rate set by external capacitor on RUN/SS pins ensures monotonic voltage rise-preventing latch-up in digital logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | Single-channel, 1A, 4V–150V input; no integrated boost diodes; requires external bootstrap diodes. | Higher input voltage range but lacks dual-output integration-suitable only when one rail suffices and 150V operation is mandatory. | Select only if input exceeds 36V and dual outputs are not required; adds design complexity due to external diodes and separate compensation. |
| TPS54290PWPR | Dual-channel, 2A per channel, 4.5V–60V input; external compensation; no integrated boost diodes or OVP. | Broad input range and higher current, but lacks automotive temp grade and built-in 60V transient protection. | Consider for cost-sensitive industrial designs where 150°C operation and guaranteed OVP are not required; requires additional protection circuitry. |
Compared with LTC3631EMSE#PBF and TPS54290PWPR, the LT3509HMSE#TRPBF delivers integrated dual regulation, automotive temperature rating, and complete transient protection in a single MSOP-16 package-reducing total solution size and validation effort for harsh-environment multi-rail systems.
Availability
LT3509HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, networking edge equipment, and CPU/DSP power applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LT3509HMSE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3509HMSE#TRPBF belongs to ADI's legacy Linear Technology Power Management product line, designed specifically for rugged, high-reliability DC/DC conversion in automotive, industrial, and communications infrastructure where wide input range, thermal resilience, and integrated protection are critical.
FAQ
What is the maximum input voltage transient rating for LT3509HMSE#TRPBF?
The LT3509HMSE#TRPBF is rated to withstand non-repetitive 60V transients on the VIN pin for up to 1 second, while continuous operation is specified from 3.6V to 36V. This 60V transient rating aligns with ISO 7637-2 automotive load-dump requirements, making LT3509HMSE#TRPBF suitable for direct battery connection in vehicles without external clamping diodes.
Does LT3509HMSE#TRPBF require external boost diodes?
No, the LT3509HMSE#TRPBF integrates Schottky boost diodes connected to the BD pin, eliminating the need for external diodes in standard configurations. The internal diodes supply charge current to the BOOST1 and BOOST2 capacitors-reducing component count and PCB area. External diodes may be added in parallel only for extreme-duty-cycle operation (e.g., >95%) where BD supply voltage is marginal.
How is switching frequency set on LT3509HMSE#TRPBF?
Switching frequency on the LT3509HMSE#TRPBF is set by a single resistor connected from the RT pin to ground. Using the formula RT = (1.215/fSW − 0.215) × 40.2 (with fSW in MHz and RT in kΩ), frequencies from 300kHz to 2.2MHz are achievable. For example, a 40.2kΩ resistor yields ~1MHz. The SYNC pin also supports external clock synchronization at frequencies ≥12% above the RT-set free-run frequency.
What is the purpose of the DA1 and DA2 pins on LT3509HMSE#TRPBF?
The DA1 and DA2 pins on LT3509HMSE#TRPBF serve as anode connections for the internal catch diode current sensing network. They monitor valley inductor current during discontinuous conduction mode and trigger cycle-by-cycle limiting when diode current exceeds ~0.95A-providing short-circuit robustness without external current-sense resistors. These pins are internally tied to GND through precision current-sense elements.
Is LT3509HMSE#TRPBF qualified for automotive under-hood applications?
Yes, the LT3509HMSE#TRPBF is qualified for automotive under-hood use with a guaranteed operating junction temperature range of –40°C to 150°C (H-grade). It includes overtemperature shutdown, 60V transient tolerance, and stable 0.8V reference over temperature-meeting key requirements for engine control units, ADAS domain controllers, and infotainment systems deployed in high-ambient environments.
LT3509HMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 700mA
- Frequency - Switching:
- 260kHz ~ 2.15MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3509HMSE#TRPBF FAQ
1.How can I place an order for LT3509HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3509HMSE#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 LT3509HMSE#TRPBF reliable?
The price and inventory of LT3509HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3509HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3509HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3509HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3509HMSE#TRPBF?
LT3509HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3509HMSE#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 LT3509HMSE#TRPBF?
For technical support, including LT3509HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3509HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3509HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3509HMSE#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 LT3509HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3509HMSE#TRPBF?
All LT3509HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3509HMSE#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 LT3509HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3509HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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