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Analog Devices Inc. LT3680EMSE#TRPBF
- Part No.:
- LT3680EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3680EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,912
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Product details
Overview
LT3680EMSE#TRPBF from Analog Devices is a 36V, 3.5A, 2.4MHz monolithic buck switching regulator with 75µA quiescent current in Burst Mode, integrated 95mΩ NPN switch and boost Schottky diode, designed for wide-input industrial and automotive power supplies delivering stable 3.3V/5V outputs under variable load and input conditions.
For engineers reviewing the LT3680EMSE#TRPBF datasheet, LT3680EMSE#TRPBF pinout, LT3680EMSE#TRPBF application, or LT3680EMSE#TRPBF equivalent, this page delivers verified electrical parameters, thermal package data, soft-start and power-good signaling behavior, and real-world efficiency curves across 3.6V–36V input range - all critical for high-reliability DC/DC design validation.
Technical Context
The LT3680EMSE#TRPBF employs constant-frequency current-mode control with adjustable oscillator (200kHz–2.4MHz via RT resistor), enabling precise loop stability and fast transient response. Its internal bipolar NPN switch is driven by a BOOST pin voltage higher than VIN, ensuring saturation and low conduction loss (335mV at 3.5A).
Burst Mode operation reduces quiescent current to 75µA while maintaining output ripple below 15mVP-P; bias current is drawn from VOUT when >3V to further improve light-load efficiency. The device integrates thermal shutdown, power-good flag (91% VREF threshold), and soft-start via RUN/SS pin ramping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports direct connection to 12V/24V automotive batteries and industrial rails without pre-regulation. |
| Max Output Current | 3.5A - delivers full rated load with thermal derating up to 125°C junction temperature in MSOP package. |
| Quiescent Current | 75µA at 12VIN→3.3VOUT in Burst Mode - enables always-on systems with multi-year battery life. |
| Switch On-Resistance | 95mΩ - ensures <335mV conduction drop at 3.5A, minimizing I²R losses and thermal rise. |
| Feedback Reference | 0.790V ±10mV - enables precise output programming from 0.79V to 30V using standard resistor dividers. |
| Switching Frequency | 200kHz to 2.4MHz - selectable via RT pin; higher frequencies allow smaller magnetics (e.g., 4.7µH at 600kHz). |
| Power Good Threshold | 91% of VREF (±65mV offset) - provides reliable enable signaling for downstream logic or sequencing controllers. |
Pinout & Package
LT3680EMSE#TRPBF is housed in a thermally enhanced 10-lead plastic MSOP package (MSE) with exposed pad (Pin 11) soldered to PCB for low θJC = 10°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Boost Diode Anode Connection | Supplies bias current to internal regulator; must connect to Schottky diode anode for BOOST capacitor charging. |
| BOOST (Pin 2) | Switch Gate Drive Boost Supply | Provides >VIN voltage to fully saturate internal NPN switch; requires external boost capacitor and diode. |
| SW (Pin 3) | Switch Node Output | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt switching current. |
| VIN (Pin 4) | Main Input Power Supply | Supplies power to internal regulator and switch; requires local 10µF ceramic bypass close to pin. |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Pull ≥2.5V for operation; tie RC network to generate controlled VOUT ramp; <0.2V enables shutdown (<0.5µA IQ). |
| SYNC (Pin 6) | External Clock Synchronization | Accepts 250kHz–2MHz clock for EMI reduction; ground for Burst Mode; must not float. |
| PG (Pin 7) | Open-Drain Power-Good Flag | Sinks current when VFB < 91% of 0.79V; valid only if VIN > 3.6V and RUN/SS enabled. |
| FB (Pin 8) | Feedback Voltage Sense | Regulated to 0.790V; connects to resistor divider tap; bias current flows out (10–40nA). |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; external RC compensation network sets loop bandwidth and phase margin. |
| RT (Pin 10) | Oscillator Frequency Set | Resistor to GND sets fSW: 8.66kΩ → 2.4MHz, 29.4kΩ → 1MHz, 187kΩ → 200kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode Path | Eliminates external boost diode; BD pin supplies bias current to internal regulator when VOUT > 3V, improving light-load efficiency. |
| Low-Ripple Burst Mode Operation | Maintains <15mVP-P output ripple at 75µA IQ - critical for noise-sensitive analog/RF subsystems powered from same rail. |
| Thermally Optimized MSOP Package | Exposed pad (Pin 11 = GND) enables θJA = 45°C/W; supports 3.5A continuous output with minimal heatsinking in compact layouts. |
| Programmable Switching Frequency | 200kHz–2.4MHz range allows tradeoff between inductor size (smaller at high fSW) and efficiency (higher at low fSW). |
| Power-Good Flag with Hysteresis | PG asserts when VFB reaches 91% of 0.79V (±10mV hysteresis); open-drain output simplifies interfacing to microcontroller reset inputs. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery supply to 3.3V/5V for infotainment MCU, CAN transceivers, and sensor interfaces under cold-crank (4.5V) and load-dump (36V) conditions. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled power domain with thermal protection and power-good sequencing. Use Value: Withstands 36V transients without external clamping; 75µA Burst Mode IQ extends battery runtime during key-off monitoring. |
Use Scenario: Point-of-load conversion in programmable logic controllers (PLCs), where 24V field bus powers multiple 5V/3.3V I/O modules with varying load profiles. IC Role / Device Role / Timing Role: High-current, wide-VIN DC/DC regulator delivering stable output despite long cable drops and shared rail noise. Use Value: 3.5A capability supports multiple downstream LDOs; SYNC pin enables system-wide clock synchronization to reduce EMI peaks. |
| Portable Product Power | Wall Transformer Regulation |
Use Scenario: Powering handheld test equipment with Li-ion battery (3.0–4.2V) and auxiliary 12V adapter input, requiring seamless switchover and low-noise 3.3V for ADC and RF front-end. IC Role / Device Role / Timing Role: Dual-input buck regulator with automatic bias sourcing from VOUT to minimize no-load drain on battery. Use Value: BD pin draws bias from regulated output when VOUT > 3V, reducing total system IQ to <100µA in standby - extending battery life beyond 1000 hours. |
Use Scenario: Replacing linear regulators in AC/DC wall adapters to improve efficiency and reduce heat in space-constrained consumer electronics enclosures. IC Role / Device Role / Timing Role: High-efficiency step-down stage converting unregulated 9–18V DC from transformer rectifier to clean 5V USB-compliant output. Use Value: 95mΩ switch and integrated boost path achieve >90% efficiency at 2A load; MSOP package fits legacy board footprints with minimal layout change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#TRPBF | 42V input, 3.5A, 2MHz sync rectification, 2.5µA IQ in Silent Switcher mode; no integrated boost diode path. | Superior EMI performance and lower IQ, but requires external bootstrap circuitry and lacks BD pin bias optimization. | Select when ultra-low noise and sub-3µA shutdown current are mandatory; avoid if BD-driven efficiency gain at light loads is required. |
| TPS54360DGQR | 36V input, 3.5A, 100kHz–2.5MHz, 145µA IQ, integrated high-side MOSFET; no boost diode or BD pin. | Lower cost, wider frequency range, but higher light-load IQ and no VOUT-bias capability - less suitable for battery-backed systems. | Select for cost-sensitive industrial supplies where 145µA IQ is acceptable and thermal constraints allow larger inductors at lower fSW. |
Compared with LT3680EMSE#TRPBF, LT8610EMSE#TRPBF offers superior EMI suppression and lower shutdown current but sacrifices the BD-pin efficiency boost, while TPS54360DGQR provides broader frequency flexibility at higher quiescent current and no integrated bias path - making LT3680EMSE#TRPBF optimal for automotive and portable designs prioritizing light-load efficiency and thermal density.
Availability
LT3680EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and portable product power applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3680EMSE#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive safety markets.
The LT3680EMSE#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, engineered specifically for high-voltage, high-current industrial and automotive power conversion with emphasis on thermal robustness, wide input range, and low-noise operation.
FAQ
What is the maximum input voltage rating for LT3680EMSE#TRPBF?
The absolute maximum input voltage for LT3680EMSE#TRPBF is 36V on the VIN pin. During normal regulation, transients up to 36V are acceptable regardless of switching frequency. However, under startup or overload, the safe maximum depends on fSW and minimum on-time - e.g., at 2.4MHz, VIN(MAX) ≈ 24V is recommended to avoid violating tON(MIN) constraints. Always verify against the specific application's worst-case duty cycle.
How does the BD pin improve efficiency in LT3680EMSE#TRPBF?
The BD pin on LT3680EMSE#TRPBF enables bias current sourcing from the regulated output when VOUT exceeds 3V, reducing reliance on VIN for internal regulator power. This lowers total input quiescent current - especially critical in battery-powered systems - and improves light-load efficiency beyond what standard buck topologies achieve. The LT3680EMSE#TRPBF datasheet confirms 30–65µA IQ under this condition versus 120–160µA when BD = 0V.
Can LT3680EMSE#TRPBF operate without an external boost diode?
No - LT3680EMSE#TRPBF requires an external Schottky diode connected between BD (Pin 1) and BOOST (Pin 2) to charge the boost capacitor. The IC integrates the boost diode *path* but not the diode itself; omission causes insufficient gate drive voltage, leading to switch saturation failure and thermal runaway. Diodes Inc. PDS340 or On Semiconductor MBRA340 are validated choices per the LT3680EMSE#TRPBF application notes.
What is the thermal performance of LT3680EMSE#TRPBF in its MSOP package?
LT3680EMSE#TRPBF in the 10-lead MSOP package (MSE) achieves θJA = 45°C/W and θJC = 10°C/W when the exposed pad (Pin 11) is soldered to a minimum 1-inch² copper area. At 3.5A output and 12VIN→5VOUT, junction temperature rise is ~45°C above ambient - well within the –40°C to 125°C operating range. Derating begins above 100°C junction; full 3.5A is guaranteed only up to 125°C TJ.
Does LT3680EMSE#TRPBF support forced continuous conduction mode (FCCM)?
No - LT3680EMSE#TRPBF does not offer user-selectable FCCM. It operates in pulse-width modulation (PWM) mode under heavy load and automatically transitions to low-ripple Burst Mode at light loads to maintain 75µA IQ. There is no pin or register to disable Burst Mode; however, SYNC pin grounding preserves Burst Mode, while driving it with an external clock forces fixed-frequency operation - though light-load efficiency degrades to ~200µA IQ.
LT3680EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (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:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.79V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 230kHz ~ 2.45MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3680EMSE#TRPBF FAQ
1.How can I place an order for LT3680EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3680EMSE#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 LT3680EMSE#TRPBF reliable?
The price and inventory of LT3680EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3680EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3680EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3680EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3680EMSE#TRPBF?
LT3680EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3680EMSE#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 LT3680EMSE#TRPBF?
For technical support, including LT3680EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3680EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3680EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3680EMSE#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 LT3680EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3680EMSE#TRPBF?
All LT3680EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3680EMSE#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 LT3680EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3680EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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