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Analog Devices Inc. LT3500EMSE#TRPBF
- Part No.:
- LT3500EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3500EMSE#TRPBF.pdf
- Description:
- IC REG DL BUCK/LINEAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,731
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Product details
Overview
LT3500EMSE#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 36V 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 - used in automotive battery regulation and industrial distributed power systems.
For engineers reviewing the LT3500EMSE#TRPBF datasheet, LT3500EMSE#TRPBF pinout, LT3500EMSE#TRPBF application, or LT3500EMSE#TRPBF equivalent, key selection criteria include input voltage range (3–36V), peak switch current (2.3A), thermal shutdown protection, 16-pin MSOP package with exposed pad, and dual-regulation capability (buck + linear).
Technical Context
The LT3500EMSE#TRPBF integrates a current-mode PWM buck converter with an internal 2.3A NPN switch and a separate linear regulator driver (LDRV) capable of 13mA output or external NPN control. Its error amplifier uses transconductance architecture (150–350 μmho) with VC pin serving as both compensation node and current clamp point.
It supports synchronization via RT/SYNC pin across 250kHz–2.2MHz, employs cycle-by-cycle current limiting, frequency foldback under overload, and includes dedicated PG/PG open-collector comparators with 30mV hysteresis referenced to 0.8V FB/LFB thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V operating; 40V absolute max - supports automotive batteries and unregulated industrial supplies without external pre-regulation. |
| Switch Current Limit | 2.3A typical peak (MSE package) - enables 2A continuous output with margin for transient loads and temperature derating. |
| Output Voltage Range | Adjustable down to 0.8V via FB divider - allows precise regulation for modern low-voltage logic and analog circuitry. |
| Switching Frequency | 250kHz to 2.2MHz, resistor- or sync-programmable - balances efficiency vs. component size (e.g., 1MHz enables ~3.3μH inductor). |
| Shutdown Current | <12μA typical - ensures minimal battery drain in always-on automotive or portable systems. |
| Power Good Threshold | Rising edge at 0.708V ±20mV on FB/LFB - provides reliable system-level power sequencing and fault detection. |
| Linear Regulator Drive | LDRV output: 13mA max, 0.8V reference tracking - supports local low-noise bias generation or external high-current linear stage. |
Pinout & Package
LT3500EMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (pin 17 = GND). The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Powers internal bias circuits and connects to collectors of internal NPN switch and LDRV transistor; requires local high-frequency decoupling. |
| SHDN | Enable/disable control | 0.76V threshold; sinking <3.5μA when active - enables undervoltage lockout and ultra-low-power standby mode. |
| SS | Soft-start & tracking control | 2.75μA constant-current source/sink - sets ramp rate for both switching and linear outputs; supports output voltage tracking. |
| FB | Switching regulator feedback | Inverting input of buck error amplifier; regulated to 0.8V - determines VOUT1 via external resistor divider. |
| LFB | Linear regulator feedback | Inverting input of linear error amplifier; regulated to 0.8V - determines VOUT2 or external linear stage output. |
| LDRV | Linear regulator driver output | Emitter of internal NPN; 13mA max sink/source - configurable as LDO output or base drive for external pass transistor. |
| RT/SYNC | Frequency programming | 1V internal reference; resistor sets frequency or accepts external clock - enables EMI reduction via spread-spectrum sync. |
| PG / PG | Power good status | Open-collector NPN outputs with complementary logic - indicate regulation status of both FB and LFB simultaneously. |
| VC | Error amplifier output | Transconductance amplifier output and current limit comparator input - used for loop compensation and overload clamping. |
| SW | Switch emitter node | High dI/dt node connected to inductor; requires Schottky catch diode and tight layout to minimize ringing. |
| BST | Bootstrap supply | Drives switch base above VIN; minimum 2.2V boost voltage required - ensures low VCE(sat) and high efficiency. |
| NC (pins 1,8,9,16) | No connection | Electrically isolated; may be used for mechanical reinforcement or thermal relief in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Dual regulation architecture | Integrated buck converter (2A) + linear regulator controller (13mA) - reduces BOM count and board space in multi-rail systems. |
| Programmable frequency & sync | 250kHz–2.2MHz operation with external clock acceptance - enables EMI compliance and avoids noise-sensitive bands. |
| Robust protection suite | Cycle-by-cycle current limit, thermal shutdown, frequency foldback, and short-circuit protection over full input range - ensures reliability in harsh environments. |
| Tracking soft-start | Single SS capacitor controls ramp rate for both outputs - simplifies power sequencing in FPGA, DSP, or multi-core SoC applications. |
| Low-noise linear assist | LDRV with 0.8V reference tracking - delivers clean bias for ADCs, sensors, or RF circuitry without adding discrete LDOs. |
Applications
| Automotive Battery Regulation | Industrial Control Power |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery to stable 5V/3.3V rails for infotainment ECUs and ADAS modules. IC Role / Device Role / Timing Role: Primary buck converter with linear assist for noise-sensitive analog subsystems. Use Value: Withstands cold-crank (down to 3V) and load-dump (up to 40V), while maintaining <12μA shutdown current for always-on modules. | Use Scenario: Providing isolated, sequenced 5V and 3.3V supplies in PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Dual-output power manager with PG/PG signaling for system-level fault reporting. Use Value: Enables single-chip solution for main logic and analog sensor rails, reducing footprint by >30% vs. discrete regulators. |
| Wall Transformer Regulation | Distributed Power Regulation |
Use Scenario: Converting unregulated 9–24V AC/DC adapter output into clean 3.3V for IoT gateways and smart meters. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with soft-start to prevent inrush into downstream capacitors. Use Value: Achieves >87% efficiency at 1A/3.3V with 1MHz switching, enabling compact heatsink-free designs. | Use Scenario: Local point-of-load regulation in telecom line cards where multiple voltage domains coexist. IC Role / Device Role / Timing Role: Buck + linear hybrid regulator supporting independent enable/control of two output rails. Use Value: LDRV's 13mA drive allows direct powering of low-current analog sections, eliminating need for third regulator IC. |
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#TRPBF | Monolithic 3A buck only (no linear regulator controller); 4V–15V input; fixed 3.3V/5V options. | Lacks LDRV functionality and dual-feedback capability - suitable only for single-rail applications requiring higher current. | Select when higher 3A output is needed and linear assist is unnecessary. |
| TPS54202DDCR | 2A buck with integrated FETs; 4.5V–17V input; no linear regulator section; 500kHz–2.5MHz sync-capable. | Does not support sub-1V output or linear tracking; lacks PG/PG and LFB pins - limited to simpler single-output use cases. | Choose for cost-sensitive industrial applications where linear assist and dual regulation are not required. |
Compared with LTC3631EMSE#TRPBF and TPS54202DDCR, the LT3500EMSE#TRPBF uniquely combines buck conversion, linear regulation control, and dual power-good signaling in one 16-pin MSOP - making it optimal for space-constrained, multi-rail embedded systems requiring low-noise auxiliary bias.
Availability
LT3500EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control power, and wall transformer regulation requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for LT3500EMSE#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 high-performance power management portfolio with rigorous qualification standards.
The LT3500 product line was designed for rugged, multi-rail DC/DC conversion in automotive, industrial, and instrumentation applications - emphasizing wide input range, integrated protection, and dual-output flexibility.
FAQ
What is the maximum output current supported by the LT3500EMSE#TRPBF switching regulator?
The LT3500EMSE#TRPBF supports up to 2A continuous output current from its integrated buck converter. Its internal NPN switch has a typical peak current rating of 2.3A in the MSE package, providing headroom for transient loads and thermal derating across the –40°C to +125°C operating range. Output current is limited by inductor saturation, thermal performance, and input voltage conditions.
Can the LT3500EMSE#TRPBF generate two independent regulated outputs?
Yes, the LT3500EMSE#TRPBF can regulate two independent outputs: one via its main buck converter (VOUT1, controlled by FB) and a second via its linear regulator driver (VOUT2, controlled by LFB/LDRV). The LDRV pin can either source up to 13mA directly or drive an external NPN transistor for higher-current linear regulation, with both outputs sharing soft-start and shutdown control.
What package type and thermal characteristics does the LT3500EMSE#TRPBF use?
The LT3500EMSE#TRPBF uses a 16-lead plastic MSOP package with exposed thermal pad (pin 17 = GND). Its thermal resistance is θJA = 45°C/W and θJC(PAD) = 10°C/W. The exposed pad must be soldered to a large PCB copper area to achieve rated performance and ensure safe operation at full load across the –40°C to +125°C junction temperature range.
How does the RT/SYNC pin function on the LT3500EMSE#TRPBF?
The RT/SYNC pin on the LT3500EMSE#TRPBF serves dual functions: connecting a resistor to ground sets switching frequency from 250kHz to 2.2MHz, while applying an external clock signal synchronizes the internal oscillator to that frequency. The pin is internally regulated to 1V in resistor mode, and synchronization occurs on rising edges with automatic slope compensation adjustment to maintain stability.
Does the LT3500EMSE#TRPBF include power-good monitoring for both outputs?
Yes, the LT3500EMSE#TRPBF includes dedicated PG and PG pins that monitor regulation status of both FB (buck output) and LFB (linear output) simultaneously. The comparators trip when both voltages exceed 90% of their 0.8V reference, with 30mV hysteresis. PG is active-low open-collector; PG is active-high open-collector - enabling flexible system-level sequencing and fault reporting.
LT3500EMSE#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
LT3500EMSE#TRPBF FAQ
1.How can I place an order for LT3500EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3500EMSE#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 LT3500EMSE#TRPBF reliable?
The price and inventory of LT3500EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3500EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3500EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3500EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3500EMSE#TRPBF?
LT3500EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3500EMSE#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 LT3500EMSE#TRPBF?
For technical support, including LT3500EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3500EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3500EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3500EMSE#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 LT3500EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3500EMSE#TRPBF?
All LT3500EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3500EMSE#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 LT3500EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3500EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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