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Analog Devices Inc. LT3500IMSE#TRPBF
- Part No.:
- LT3500IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3500IMSE#TRPBF.pdf
- Description:
- IC REG DL BUCK/LINEAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,852
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Product details
Overview
LT3500IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 2A step-down DC/DC converter with integrated 2.3A NPN switch and configurable linear regulator controller, operating from 3V to 36V input. It delivers up to 2A output current, supports adjustable switching frequency from 250kHz to 2.2MHz, and features soft-start, power-good monitoring, and thermal shutdown-ideal for automotive battery regulation and industrial distributed power systems.
For engineers reviewing the LT3500IMSE#TRPBF datasheet, LT3500IMSE#TRPBF pinout, LT3500IMSE#TRPBF application, or LT3500IMSE#TRPBF equivalent, key selection considerations include its dual-regulator architecture (buck + linear), 0.8V feedback reference, 12μA shutdown current, MSE-16 package thermal performance, and synchronization capability for EMI-sensitive designs.
Technical Context
The LT3500IMSE#TRPBF implements current-mode PWM control with cycle-by-cycle current limiting, frequency foldback under overload, and internal slope compensation. Its dual-error-amplifier architecture independently regulates the buck output (via FB pin at 0.8V) and linear output (via LFB pin at 0.8V), both tracking the SS pin during soft-start.
Switching operation relies on a resistor-programmable oscillator (RT/SYNC pin) or external sync signal, with minimum on/off times of 140ns/120ns ensuring stable high-frequency operation. The integrated NPN power switch and LDRV driver support both standalone linear regulation (13mA max) and external high-current linear configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V operating; 40V absolute maximum - supports automotive cold-crank and industrial 24V rails without external protection. |
| Switch Current Limit | 2.3A typical peak (MSE package) - enables 2A continuous output with margin for transient loads and temperature derating. |
| Feedback Reference | 0.8V ±1.2% over –40°C to 125°C - ensures precise output voltage setting across full industrial temperature range. |
| Switching Frequency | 250kHz to 2.2MHz, adjustable via RT/SYNC resistor or external clock - allows optimization of size vs. efficiency in space-constrained designs. |
| Shutdown Current | 12μA typical - enables ultra-low-power sleep modes in battery-backed systems without auxiliary regulators. |
| Power Good Threshold | Rising edge at 0.708V (FB/LFB), 30mV hysteresis - provides reliable system-level power sequencing and fault detection. |
| Linear Regulator Drive | LDRV pin delivers up to 13mA with 1.2V dropout at 5mA - supports local low-noise bias generation or external pass transistor control. |
Pinout & Package
LT3500IMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSE package (3mm × 4.5mm footprint) with exposed pad (Pin 17) soldered to PCB ground for optimal thermal dissipation (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Powers internal bias circuitry and connects to collectors of internal NPN switch and LDRV transistor; requires local high-frequency decoupling. |
| SW | Switch emitter node | Connects to inductor and catch diode; experiences high dV/dt negative swing during turn-off - demands tight layout and Schottky clamping. |
| BST | Bootstrap supply | Drives internal NPN base above VIN via external capacitor/diode; minimum 2.2V boost voltage required for full switch saturation. |
| FB | Buck regulator feedback | Negative input of buck error amplifier; regulated to 0.8V - sets VOUT1 via resistor divider (R1/R2). |
| LFB | Linear regulator feedback | Negative input of linear error amplifier; regulated to 0.8V - sets VOUT2 or controls external pass device. |
| LDRV | Linear driver output | Emitter of internal NPN; supplies up to 13mA with 1.2V dropout - usable as LDO output or base drive for external PNP/NPN. |
| PG / PG | Power good indicators | Open-collector NPN outputs asserting when FB and LFB exceed 90% of 0.8V - provide active-low and active-high status signals. |
| SHDN | Enable/shutdown control | 0.76V threshold with hysteresis; <12μA shutdown current - enables undervoltage lockout and system-level power management. |
| SS | Soft-start and tracking | Controls ramp rate of both regulators via external capacitor; enables output voltage sequencing and inrush current limiting. |
| VC | Error amplifier output | Transconductance amplifier output driving peak current comparator; used for loop compensation and current limiting override. |
| RT/SYNC | Oscillator control | Resistor sets frequency (250kHz–2.2MHz) or accepts external sync clock on rising edge - maintains slope compensation during sync. |
| GND | Signal and power ground | Exposed pad (Pin 17) is sole ground connection - must be soldered to large copper area for thermal and noise performance. |
| NC (Pins 1, 8, 9, 16) | No connection | Electrically isolated; may be used for PCB routing or thermal relief - no electrical function or internal connection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation paths | Simultaneous buck (VOUT1) and linear (VOUT2/LDRV-driven) outputs with shared soft-start and shutdown - simplifies multi-rail power sequencing. |
| Programmable high-frequency switching | 250kHz–2.2MHz operation reduces inductor/capacitor size while maintaining >87% efficiency at 1MHz (3.3V/2A, 25VIN). |
| Robust protection suite | Cycle-by-cycle current limit, thermal shutdown, frequency foldback, and short-circuit protection across full 3V–40V input range - eliminates need for external fault management. |
| True tracking soft-start | Single SS capacitor controls ramp rate of both regulators with 100mV offset - ensures monotonic startup and prevents reverse current in cascaded rails. |
| Low-noise linear assist | 0.8V-referenced LDRV output with 13mA drive and 1.2V dropout - delivers clean bias for analog/RF circuits without adding switching noise. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering DSP, FPGA, and display interfaces in head units with wide-input 12V battery supply including cold-crank (down to 3.5V) and load-dump transients. IC Role / Device Role / Timing Role: Primary buck regulator (VOUT1 = 3.3V/2A) plus low-noise linear post-regulator (VOUT2 = 1.8V) for core logic and ADC references. Use Value: 3V–36V input range handles automotive transients; 12μA shutdown extends battery life during vehicle sleep mode. | Use Scenario: Generating isolated 5V and 3.3V rails for microcontroller, communication ICs, and analog sensor front-ends in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Dual-output DC/DC converter providing main system rail (5V/2A) and precision analog rail (3.3V/1A) with coordinated soft-start. Use Value: Integrated PG/PG outputs enable safe power-up sequencing; thermal shutdown protects against enclosure overheating in sealed enclosures. |
| Medical Point-of-Care Device | Test & Measurement Equipment |
Use Scenario: Powering portable ultrasound or glucose meter with battery backup, requiring low quiescent current and clean analog supplies. IC Role / Device Role / Timing Role: Buck converter (VOUT1 = 3.3V) feeding LDRV-configured linear regulator (VOUT2 = 2.5V) for ADC reference and op-amp bias. Use Value: 0.8V reference and 30mV PG hysteresis ensure stable analog measurements; 13mA LDRV drive eliminates need for discrete LDO. | Use Scenario: Supplying mixed-signal boards with sensitive PLLs, DACs, and high-speed interfaces where switching noise must be minimized. IC Role / Device Role / Timing Role: Synchronized buck (800kHz) + linear post-regulator delivering 1.2V core and 3.3V I/O rails with EMI-controlled timing. Use Value: External sync capability aligns switching edges to avoid beat frequencies with sampling clocks; exposed-pad thermal design sustains 2A load at 85°C ambient. |
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 | Monolithic 2A buck only (no integrated linear regulator); 3V–40V input; 0.6V reference; 3mm × 4mm MSE-16 package. | Requires external LDO for low-noise rail; lacks LFB/LDRV pins and tracking soft-start. | Select when only one regulated rail is needed and board space is critical - smaller solution size but higher BOM count for dual-rail systems. |
| TPS54202DDCR | 2A synchronous buck (no linear regulator); 4.5V–28V input; 0.8V reference; 6-pin SOT-23 package; no PG or SS pins. | Cannot generate second low-noise rail; limited input range excludes automotive battery direct connection. | Choose for cost-sensitive, single-rail applications where thermal constraints allow SOT-23 packaging and external sequencing is acceptable. |
Compared with LTC3631EMSE#PBF and TPS54202DDCR, the LT3500IMSE#TRPBF uniquely integrates buck + linear regulation in one IC with true tracking soft-start and dual PG outputs - reducing component count and improving reliability in dual-rail industrial and automotive systems without increasing PCB area.
Availability
LT3500IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC modules, medical point-of-care devices, and test & measurement equipment requiring stable component supply across extended temperature ranges.
Supply support for LT3500IMSE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3500 product line was designed specifically for compact, high-reliability dual-output power conversion in harsh environments - combining robust input tolerance, integrated protection, and thermal resilience in small-outline packages.
FAQ
What is the maximum output current capability of the LT3500IMSE#TRPBF?
The LT3500IMSE#TRPBF supports up to 2A continuous output current from its integrated buck converter, with a typical peak switch current rating of 2.3A in the MSE-16 package. The linear regulator path (LDRV) delivers up to 13mA. Actual achievable current depends on input voltage, ambient temperature, PCB copper area, and thermal management - derating is required above 85°C ambient per the datasheet's thermal characteristics.
Does the LT3500IMSE#TRPBF require an external catch diode?
Yes, the LT3500IMSE#TRPBF requires an external Schottky catch diode connected from SW to GND. Because it uses an NPN internal switch (not synchronous MOSFETs), the diode provides the return current path during switch-off. A low-forward-voltage, fast-recovery Schottky diode placed close to the SW and VIN pins is mandatory to prevent negative voltage excursions and ensure efficiency.
How does the LT3500IMSE#TRPBF achieve output voltage tracking during startup?
The LT3500IMSE#TRPBF achieves tracking via its dedicated SS (soft-start) pin, which sources a constant 2.75μA current into an external capacitor. Both the buck regulator (FB) and linear regulator (LFB) error amplifiers compare their respective feedback voltages to (VSS – 100mV), causing both outputs to ramp simultaneously at identical rates until regulation is established - eliminating cross-rail stress in multi-supply systems.
Can the LT3500IMSE#TRPBF operate with input voltage below 3V?
No, the LT3500IMSE#TRPBF has a specified minimum operating input voltage of 3V. While the absolute minimum bias voltage is ~2.8V (per datasheet Note 3), reliable regulation - especially at full load and over temperature - requires ≥3V at VIN. Operation below 3V risks undervoltage lockout, loss of regulation, or erratic switching behavior.
What is the purpose of the NC pins on the LT3500IMSE#TRPBF MSE-16 package?
The NC pins (Pins 1, 8, 9, and 16) on the LT3500IMSE#TRPBF MSE-16 package are electrically isolated with no internal connection. They serve solely for mechanical stability and PCB layout flexibility - they may be tied to ground pour or left floating, but must never be connected to active signals or power nets, as doing so could compromise thermal or electrical integrity.
LT3500IMSE#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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3500IMSE#TRPBF FAQ
1.How can I place an order for LT3500IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3500IMSE#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 LT3500IMSE#TRPBF reliable?
The price and inventory of LT3500IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3500IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3500IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3500IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3500IMSE#TRPBF?
LT3500IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3500IMSE#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 LT3500IMSE#TRPBF?
For technical support, including LT3500IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3500IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3500IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3500IMSE#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 LT3500IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3500IMSE#TRPBF?
All LT3500IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3500IMSE#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 LT3500IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3500IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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