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Analog Devices Inc. LT3500HMSE#TRPBF
- Part No.:
- LT3500HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3500HMSE#TRPBF.pdf
- Description:
- IC REG DL BUCK/LINEAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,063
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Product details
Overview
LT3500HMSE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 2A step-down DC/DC converter with integrated linear regulator controller, operating from 3V to 40V input and delivering adjustable output down to 0.8V. It features current-mode PWM control, 250kHz–2.2MHz resistor-programmable switching frequency, soft-start/tracking, and power-good monitoring - enabling dual-output regulation in automotive battery, industrial control, and distributed power systems.
For engineers reviewing the LT3500HMSE#TRPBF datasheet, LT3500HMSE#TRPBF pinout, LT3500HMSE#TRPBF application, or LT3500HMSE#TRPBF equivalent, key selection considerations include its 16-pin MSOP package with exposed thermal pad, –40°C to +150°C junction temperature rating, internal 2.3A NPN switch, 13mA linear driver capability, and dual feedback (FB/LFB) for coordinated buck + linear regulation.
Technical Context
The LT3500HMSE#TRPBF integrates a constant-frequency current-mode buck controller with an internal 2.3A NPN power switch and a separate linear regulator controller using an external NPN or internal LDRV transistor. Its dual-error-amplifier architecture supports independent regulation of switching and linear outputs via FB and LFB pins, both referenced to 0.8V with ±2% tolerance over temperature.
It employs cycle-by-cycle current limiting, frequency foldback under overload, thermal shutdown, and programmable soft-start via SS pin current source (2.75μA typical). The RT/SYNC pin enables either resistor-set operation (15kΩ–200kΩ → 2.5MHz–250kHz) or external clock synchronization with automatic slope compensation adjustment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V max; supports automotive cold-crank (≥4.5V) and industrial 24V rails without pre-regulation. |
| Switch Current Limit | 2.3A typical peak (MSE package); enables 2A continuous output with margin for transient loads. |
| Switching Frequency | 250kHz to 2.2MHz; adjustable via RT/SYNC resistor or external sync signal for EMI control and size optimization. |
| Feedback Reference | 0.8V ±2% (FB & LFB); allows precise output setting down to 0.8V with standard resistor dividers. |
| Shutdown Current | <12μA typical; enables ultra-low-power sleep mode in battery-backed systems. |
| Power Good Outputs | Complementary open-collector PG/PG with 30mV hysteresis; signals valid regulation at both FB and LFB simultaneously. |
| Operating Temp Range | –40°C to +150°C junction; qualified for under-hood automotive and high-temperature industrial environments. |
Pinout & Package
LT3500HMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17 = GND), optimized for high-power density and thermal dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC1) | No Connection | Electrically isolated; may be used for PCB layout routing or thermal relief. |
| 2 (VIN) | Main Power Input | Powers internal bias circuitry and connects to collectors of internal NPN switch and LDRV transistor; requires local high-frequency decoupling. |
| 3 (SHDN) | Enable/Shutdown Control | 0.76V threshold with hysteresis; floating or >0.76V enables operation; <0.76V reduces supply current to <12μA. |
| 4 (SS) | Soft-Start/Tracking Input | 2.75μA current source charges external capacitor; controls ramp rate of both switching and linear outputs for inrush limiting and sequencing. |
| 5, 6 (PG, PG) | Complementary Power-Good Outputs | Open-collector NPN outputs active when FB and LFB both exceed 90% of 0.8V; provide system-level power status with built-in hysteresis. |
| 7 (VC) | Error Amplifier Output | Transconductance amplifier output driving peak-current comparator; used for loop compensation, current clamping, or override control. |
| 8 (RT/SYNC) | Frequency Set/Synchronization Input | Internally regulated at 1V; resistor-to-ground sets frequency (250kHz–2.2MHz); external clock synchronizes on rising edge with auto-slope compensation. |
| 9 (NC8) | No Connection | Electrically isolated; no internal connection; usable for mechanical stability or thermal conduction. |
| 10 (SW) | Switch Emitter Node | Emitter of internal 2.3A NPN switch; requires external Schottky catch diode and low-inductance path to ground. |
| 11 (BST) | Bootstrap Supply | Drives internal NPN base above VIN via external capacitor/diode; minimum 2.2V boost voltage required for full saturation. |
| 12 (LDRV) | Linear Driver Output | Emitter of internal NPN; configurable as 13mA linear regulator output or driver for external high-current NPN pass transistor. |
| 13 (LFB) | Linear Regulator Feedback | Negative input of linear error amplifier; regulates LDRV to 0.8V; supports tracking with SS pin. |
| 14 (FB) | Switching Regulator Feedback | Negative input of buck error amplifier; regulates SW node output to 0.8V; bias current flows out of pin. |
| 15 (PG) | Power-Good Output (redundant label) | Duplicate labeling per datasheet top view; electrically identical to Pin 5. |
| 16 (NC16) | No Connection | Electrically isolated; no internal connection; may be tied to GND for thermal enhancement if needed. |
| 17 (Exposed Pad) | Ground / Thermal Interface | Primary GND connection and thermal path; must be soldered to large PCB copper area for θJC = 10°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Regulation Architecture | Simultaneous control of buck converter (via FB) and linear regulator/controller (via LFB/LDRV) enables compact dual-rail power solutions without discrete LDOs. |
| Programmable Soft-Start & Tracking | Single SS capacitor coordinates startup ramp rate for both outputs, preventing inrush current and enabling precise power sequencing in multi-rail systems. |
| Robust Protection Suite | Cycle-by-cycle current limit, thermal shutdown, frequency foldback, and VIN undervoltage lockout ensure reliable operation under fault conditions across full input range. |
| High-Temperature Qualified | –40°C to +150°C guaranteed operation (H-grade) supports under-hood automotive, motor drives, and industrial enclosures without derating. |
| Synchronization Capability | RT/SYNC pin accepts external clock (250kHz–2.5MHz) with automatic slope compensation adjustment, enabling deterministic EMI reduction in noise-sensitive applications. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powering microcontroller core (3.3V/1A) and CAN transceiver (5V/100mA) from 12V battery with cold-crank tolerance down to 6V. IC Role / Device Role / Timing Role: Primary buck regulator (VOUT1 = 3.3V) + linear post-regulator (VOUT2 = 5V) with coordinated soft-start and PG signaling. Use Value: Eliminates need for separate LDO; PG/PG outputs enable safe MCU boot sequencing and fault detection during battery transients. | Use Scenario: Generating isolated 5V and 3.3V rails for digital I/O and analog sensor front-end in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Dual-output DC/DC with adjustable frequency (800kHz) to avoid AM band interference and support compact magnetics. Use Value: Single-chip solution reduces BOM count and board space vs. discrete buck + LDO; 150°C rating ensures reliability in sealed enclosures. |
| Medical Point-of-Care Device | Telecom Remote Radio Unit |
Use Scenario: Providing clean, low-noise 3.3V for ADC/DAC and 1.8V for FPGA core from 24V industrial supply in portable diagnostic equipment. IC Role / Device Role / Timing Role: Buck regulator (3.3V) + linear controller driving external PNP for 1.8V, with SS-controlled ramp to prevent sensor offset drift during power-up. Use Value: LDRV's 13mA drive capability enables precision low-dropout linear regulation without external op-amp; SS tracking ensures monotonic startup. | Use Scenario: Powering RF PA bias and digital baseband ASIC from unregulated 48V telecom supply in outdoor small-cell radio units. IC Role / Device Role / Timing Role: High-input buck (VOUT1 = 5V @ 2A) with sync to system clock (1.2MHz) to suppress switching noise in sensitive RF bands. Use Value: Synchronization eliminates beat frequencies; 40V absolute max rating accommodates 48V transients without input protection circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC/DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | Single 3A buck only; no integrated linear regulator controller; 4V–75V input; 3mm × 4mm MSOP. | Requires external LDO for second rail; better suited for high-input-voltage single-output applications. | Select when higher input voltage (>40V) or greater buck current (>2A) is required, and linear regulation is handled separately. |
| TPS54202HDDCR | 2A buck-only with integrated FETs; 4.5V–18V input; 3mm × 3mm SON; no linear regulator function or LDRV pin. | Lacks linear regulation capability; limited input range excludes automotive battery direct connection. | Choose for cost-sensitive, lower-input-voltage applications where only one regulated rail is needed and thermal performance is less critical. |
Compared with LTC3631EMSE#PBF and TPS54202HDDCR, LT3500HMSE#TRPBF uniquely integrates buck + linear control in one package with 3V–40V input, 0.8V reference, and coordinated soft-start - making it optimal for space-constrained dual-rail systems requiring automotive or extended-temperature qualification.
Availability
LT3500HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power supplies, and medical point-of-care devices requiring stable component supply with extended temperature support and dual-output integration.
Supply support for LT3500HMSE#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 digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3500 product line was designed by Linear Technology to deliver highly integrated, thermally robust DC/DC solutions for demanding automotive, industrial, and medical applications requiring dual-output regulation and extended temperature operation.
FAQ
What is the maximum output current capability of LT3500HMSE#TRPBF?
The LT3500HMSE#TRPBF supports up to 2A continuous output from its integrated buck converter, based on its 2.3A peak switch current rating (guaranteed over –40°C to +150°C). The linear regulator controller (LDRV) provides up to 13mA directly or drives an external NPN for higher current. Actual achievable output depends on input voltage, ambient temperature, PCB thermal design, and inductor selection - with 2A sustained at 12VIN/3.3VOUT achievable using proper layout and 3.3μH inductor.
Does LT3500HMSE#TRPBF support synchronization to an external clock?
Yes, LT3500HMSE#TRPBF supports external clock synchronization via the RT/SYNC pin. When driven with a TTL/CMOS-compatible clock signal (250kHz–2.5MHz), the device locks its switching frequency to the incoming signal on each rising edge and automatically adjusts internal slope compensation to prevent subharmonic oscillation. In sync mode, the internal 1V reference is disabled, and oscillator timing is fully controlled by the external source - enabling deterministic EMI reduction in noise-sensitive systems.
How does the soft-start function work on LT3500HMSE#TRPBF?
The LT3500HMSE#TRPBF implements soft-start via a 2.75μA (typical) current source connected to the SS pin. Charging an external capacitor from SS to GND generates a linear voltage ramp that controls the regulation setpoint for both the buck (FB) and linear (LFB) loops. This ensures monotonic, inrush-limited startup and enables output voltage tracking between rails. The SS pin also serves as a power-on reset input: if pulled below 100mV, it disables switching and resets the soft-start latch, allowing controlled re-initialization.
What is the purpose of the LDRV and LFB pins on LT3500HMSE#TRPBF?
The LDRV pin is the emitter of an internal NPN transistor that can operate as a 13mA linear regulator output or as a driver for an external high-current NPN pass transistor. The LFB pin is the negative input of the linear regulator's error amplifier, referenced to 0.8V - identical to the buck regulator's FB reference. Together, they enable precise, tracking-capable linear regulation coordinated with the main buck output, supporting applications requiring low-noise auxiliary rails or post-regulation for sensitive analog circuits.
Can LT3500HMSE#TRPBF operate from a 5V input supply?
Yes, LT3500HMSE#TRPBF operates from a minimum input voltage of 2.8V (typical) - well below 5V - making it suitable for 5V intermediate bus applications. At 5VIN, it can regulate outputs down to 0.8V with appropriate duty cycle (e.g., 3.3V@1A or 1.8V@1A). Efficiency remains high due to low switch saturation voltage (450mV at 2A) and optimized gate drive. Note that BST capacitor charging requires sufficient headroom (≥2.2V boost voltage), so a 5V input supports reliable operation with standard 10V-rated ceramic capacitors.
LT3500HMSE#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
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 500kHz ~ 2.4MHz
- Voltage/Current - Output 1:
- 0.8V ~ 38.9V, 2A
- Voltage/Current - Output 2:
- Adjustable, 13mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 3V ~ 36V
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3500HMSE#TRPBF FAQ
1.How can I place an order for LT3500HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3500HMSE#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 LT3500HMSE#TRPBF reliable?
The price and inventory of LT3500HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3500HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3500HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3500HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3500HMSE#TRPBF?
LT3500HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3500HMSE#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 LT3500HMSE#TRPBF?
For technical support, including LT3500HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3500HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3500HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3500HMSE#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 LT3500HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3500HMSE#TRPBF?
All LT3500HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3500HMSE#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 LT3500HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3500HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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