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Analog Devices Inc. LT3759IMSE#TRPBF
- Part No.:
- LT3759IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3759IMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,271
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Product details
Overview
LT3759IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a wide-input, current-mode DC/DC controller for boost, SEPIC, and inverting topologies. It regulates positive or negative output voltages from a single FBX feedback pin, supports 1.6V–42V input, delivers up to 2A output current, features 50mV SENSE threshold, and operates from –40°C to 125°C in automotive post-regulator and industrial power supply applications.
For engineers reviewing the LT3759IMSE#TRPBF datasheet, LT3759IMSE#TRPBF pinout, LT3759IMSE#TRPBF application, or LT3759IMSE#TRPBF equivalent, key selection considerations include its dual-polarity feedback architecture, programmable 100kHz–1MHz switching frequency, PGOOD status reporting, soft-start control via SS pin, and exposed-pad MSOP-12 thermal performance.
Technical Context
The LT3759IMSE#TRPBF implements fixed-frequency current-mode control with dual error amplifiers-one for +1.6V regulation (positive outputs) and one for –0.8V regulation (negative outputs)-enabling topology-agnostic voltage programming. Its SENSE pin monitors switch current through an external sense resistor with 46–54mV threshold accuracy over temperature.
It integrates two independent LDOs: a DRIVE-powered 4.75V regulator and a VIN-powered 3.75V regulator, both feeding INTVCC; internal logic selects the active LDO based on supply conditions. The device supports frequency synchronization via SYNC pin and includes frequency foldback during start-up or short-circuit faults to limit inductor current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.6V to 42V - supports direct connection to automotive battery (cold crank to load dump) without pre-regulation. |
| Output Polarity Support | Positive or negative regulated output - selectable via FBX divider configuration; no external polarity-reversal circuitry needed. |
| SENSE Threshold | 46–54mV (typ 50mV) - enables accurate current limiting with low-value, low-power sense resistors (e.g., 5mΩ). |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor or synchronized externally; higher frequencies reduce inductor size but increase gate drive loss. |
| PGOOD Accuracy | ±5% window around regulation voltage - asserts open-collector output when FBX is within 80mV (1.6V mode) or 40mV (–0.8V mode) of target. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial environments with full parameter guarantee. |
| Shutdown Current | <1µA - enables ultra-low-power system standby with EN/UVLO pin pulled low. |
Pinout & Package
LT3759IMSE#TRPBF is housed in a 12-lead plastic MSOP package with exposed pad (Pin 13), requiring soldering to PCB ground plane for thermal and electrical integrity. θJA = 35–40°C/W with proper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Error amplifier compensation node | Connect RC network to stabilize voltage loop; clamped during soft-start to limit peak current. |
| FBX | Dual-polarity feedback input | Accepts resistor divider from output; selects +1.6V or –0.8V reference automatically based on voltage polarity. |
| SS | Soft-start control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; discharged during UVLO or thermal fault. |
| RT | Frequency programming | Resistor to GND sets oscillator frequency (100kHz–1MHz); open pin disables operation. |
| SYNC | External clock input | Accepts digital clock edge; requires RT set 20% below sync frequency; ignored if INTVCC < 2.7V. |
| PGOOD | Open-collector status output | Asserts low when INTVCC > 2.7V and FBX within ±5% of regulation; requires external pull-up. |
| EN/UVLO | Enable and input undervoltage detection | 1.22V falling threshold with programmable hysteresis; resets soft-start on undervoltage event. |
| SENSE | Current sense input | Kelvin-connected to high-side of sense resistor; referenced to GND; rejects noise via differential sensing path. |
| GATE | N-MOSFET gate driver output | Swings between INTVCC and GND; driven low during shutdown, thermal lockout, or INTVCC UVLO. |
| INTVCC | Internal regulated supply | 4.75V (DRIVE-powered) or 3.75V (VIN-powered); bypass with ≥4.7µF ceramic capacitor adjacent to pin. |
| VIN | Main input supply | Bypass with ≥1µF ceramic capacitor; powers VIN LDO and internal bias circuits. |
| GND | Ground reference and thermal pad | Exposed pad (Pin 13) must be soldered to PCB ground plane for thermal conduction and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reference feedback architecture | Single FBX pin supports both +1.6V and –0.8V regulation references-eliminates need for separate positive/negative controllers. |
| Programmable soft-start | Capacitor-controlled ramp on SS pin limits inrush current and prevents inductor saturation during startup or fault recovery. |
| Two-integrated LDO regulators | DRIVE- and VIN-powered LDOs autonomously supply INTVCC; automatic selection avoids external bias supplies and improves efficiency. |
| Frequency foldback protection | Reduces switching frequency when FBX nears GND (e.g., short-circuit or deep start-up), limiting peak inductor current without external circuitry. |
| Accurate PGOOD monitoring | Window comparator on FBX provides reliable power-good indication with defined hysteresis-critical for system sequencing and safety logic. |
Applications
| Automotive Post-Regulator | Industrial Distributed Power |
|---|---|
|
Use Scenario: Regulating 12V battery rail to stable 12V output after alternator transients and cold-crank dips. IC Role / Device Role / Timing Role: Controller for SEPIC converter delivering constant 12V at up to 2A while rejecting input dips to 2.5V and surges to 42V. Use Value: Maintains downstream ECU operation during ISO 16750-2 load-dump and cold-crank events without external pre-regulators. |
Use Scenario: Generating isolated ±15V rails for analog signal conditioning in factory automation I/O modules. IC Role / Device Role / Timing Role: Inverting controller driving N-MOSFET to produce –15V from 24V DC bus; uses same FBX divider topology as boost mode. Use Value: Eliminates need for dual-controller solutions or transformer-based designs-reduces BOM count and board area. |
| Datacom Boost Converter | Portable Equipment Power Management |
|
Use Scenario: Stepping up 3.3V or 5V intermediate rail to 12V for optical transceiver bias in telecom line cards. IC Role / Device Role / Timing Role: Boost controller operating at 500kHz with RT = 16.5kΩ; delivers 1.5A with >90% efficiency at full load. Use Value: Enables compact, high-efficiency boost stage with minimal external components-no external current-sense amplifier required. |
Use Scenario: Providing adjustable 5–24V output from Li-ion battery (2.7–4.2V/cell) in handheld test equipment. IC Role / Device Role / Timing Role: Programmable boost controller with EN/UVLO hysteresis to prevent brown-out oscillation during battery discharge. Use Value: Extends usable battery range by supporting operation down to 2.5V input while maintaining regulated output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#TRPBF | 4-switch synchronous buck-boost controller; supports 4V–36V input; no native inverting mode; requires external MOSFET drivers. | Best for high-efficiency, bidirectional voltage regulation where output must track input (e.g., USB PD sink); not suitable for pure inverting or SEPIC. | Select LTC3789EMSE#TRPBF only when synchronous rectification and input/output voltage crossover are required; LT3759IMSE#TRPBF remains preferred for cost-sensitive inverting/SEPIC. |
| MAX17595ATP+T | High-voltage current-mode controller; 4.5V–60V input; fixed 1.6V FB reference only; no negative-output support; integrated bootstrap diode. | Suitable for high-input boost applications (e.g., industrial 48V systems); lacks dual-polarity feedback and PGOOD window comparator. | Choose MAX17595ATP+T for >42V input or where bootstrap diode integration reduces component count; LT3759IMSE#TRPBF is superior for dual-polarity or automotive-grade reliability. |
Compared with LTC3789EMSE#TRPBF and MAX17595ATP+T, the LT3759IMSE#TRPBF uniquely combines true inverting capability, single-pin dual-reference feedback, and guaranteed –40°C to 125°C operation-making it irreplaceable for space-constrained automotive and industrial SEPIC/inverting designs requiring minimal external components.
Availability
LT3759IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive post-regulation, industrial distributed power, datacom boost conversion, portable equipment power management, and test instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LT3759IMSE#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. (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 LT3759 product line was designed specifically for wide-input, multi-topology DC/DC control in harsh environments-emphasizing robustness, dual-polarity flexibility, and seamless integration into automotive and industrial power systems.
FAQ
What is the guaranteed operating temperature range for LT3759IMSE#TRPBF?
The LT3759IMSE#TRPBF is guaranteed to operate from –40°C to +125°C junction temperature, with all electrical specifications fully characterized and warranted across this range. This makes it suitable for under-hood automotive applications and industrial environments where ambient temperatures exceed 85°C.
Can LT3759IMSE#TRPBF generate a negative output voltage?
Yes, the LT3759IMSE#TRPBF natively supports negative output generation in inverting topology using the same FBX pin. When configured with a resistor divider pulling FBX toward –0.8V, the internal negative-error amplifier activates, regulating VOUT = –0.8V × (1 + R2/R1). No additional ICs or polarity-reversal circuitry are required.
How is the switching frequency set on LT3759IMSE#TRPBF?
The switching frequency of LT3759IMSE#TRPBF is set by connecting a resistor from the RT pin to GND. Values range from 6.81kΩ (1MHz) to 86.6kΩ (100kHz), per Table 2 in the datasheet. Leaving RT open disables operation. For synchronization, apply an external clock to SYNC and set RT for 20% lower frequency than the sync signal.
What is the function of the PGOOD pin on LT3759IMSE#TRPBF?
The PGOOD pin on LT3759IMSE#TRPBF is an open-collector output that asserts low when two conditions are met: (1) INTVCC exceeds 2.7V, and (2) the FBX voltage is within ±5% of its regulation point (±80mV for +1.6V mode, ±40mV for –0.8V mode). It requires an external pull-up resistor and enables safe system power sequencing.
Does LT3759IMSE#TRPBF require external MOSFET drivers?
No, the LT3759IMSE#TRPBF integrates a robust N-channel MOSFET gate driver on the GATE pin, capable of sourcing/sinking sufficient current to drive typical power MOSFETs directly. It operates from INTVCC (3.75V or 4.75V) and includes fast rise/fall times (20ns typical into 3300pF), eliminating the need for external drivers in most applications.
LT3759IMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Boost, Flyback, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 1.6V ~ 42V
- Frequency - Switching:
- 100kHz ~ 1MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LT3759IMSE#TRPBF FAQ
1.How can I place an order for LT3759IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3759IMSE#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 LT3759IMSE#TRPBF reliable?
The price and inventory of LT3759IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3759IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3759IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3759IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3759IMSE#TRPBF?
LT3759IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3759IMSE#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 LT3759IMSE#TRPBF?
For technical support, including LT3759IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3759IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3759IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3759IMSE#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 LT3759IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3759IMSE#TRPBF?
All LT3759IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3759IMSE#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 LT3759IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3759IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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