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Analog Devices Inc. LT3759EMSE#TRPBF
- Part No.:
- LT3759EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3759EMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,177
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Product details
Overview
LT3759EMSE#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 outputs from a single FBX pin, supports 1.6V–42V input, delivers up to 2A output current, features 50mV SENSE threshold, programmable 100kHz–1MHz switching frequency, and operates across –40°C to 125°C. It is used in automotive post-regulators and industrial distributed supplies.
For engineers reviewing the LT3759EMSE#TRPBF datasheet, LT3759EMSE#TRPBF pinout, LT3759EMSE#TRPBF application, or LT3759EMSE#TRPBF equivalent, key selection criteria include its dual-polarity feedback architecture, PGOOD status reporting, INTVCC LDO sourcing options (VIN or DRIVE), soft-start programmability, and exposed-pad MSOP-12 thermal performance.
Technical Context
The LT3759EMSE#TRPBF implements fixed-frequency current-mode control with dual error amplifiers-one for +1.6V regulation (positive output), one for –0.8V regulation (negative output)-selected automatically by FBX voltage polarity. Its oscillator uses an external RT resistor or SYNC clock input, with frequency foldback during low-VOUT conditions to limit inductor current.
It integrates two independent LDOs: a DRIVE-sourced 4.75V regulator and a VIN-sourced 3.75V regulator, both feeding INTVCC; internal logic selects the active LDO based on supply voltages. The GATE driver switches between INTVCC and GND, with 20ns rise/fall times into 3.3nF load and minimum on/off times of 170ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.6V to 42V - supports automotive battery transients and wide industrial rails without pre-regulation. |
| Output Polarity Support | Positive or negative - single FBX pin enables boost/SEPIC (+VOUT) or inverting (–VOUT) without topology change. |
| SENSE Threshold | 50mV (±4mV) - enables accurate current limiting with low-value, low-power sense resistors. |
| Switching Frequency | 100kHz to 1MHz - set via RT resistor or synchronized externally; allows trade-off between efficiency and magnetics size. |
| PGOOD Accuracy | ±5% window around regulation voltage - reports valid output within 80mV (for +1.6V) or 40mV (for –0.8V) tolerance. |
| Shutdown Current | <1µA - enables ultra-low power disable in battery-backed or always-on systems. |
| Operating Temp Range | –40°C to 125°C - qualified for under-hood automotive and industrial environments. |
Pinout & Package
LT3759EMSE#TRPBF is housed in a 12-lead plastic MSOP package with exposed pad (Pin 13), which must be soldered to PCB ground for thermal and electrical integrity. θJA = 35–40°C/W with proper pad layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; clamped during soft-start. |
| FBX | Dual-polarity feedback input | Sets +1.6V or –0.8V regulation point; also drives PGOOD window comparators and modulates frequency during faults. |
| SS | Soft-start control | 10µA pull-up to 2.5V rail; capacitor sets ramp time; discharged during UVLO or thermal fault to reinitiate controlled start-up. |
| RT | Oscillator frequency programming | Resistor-to-GND sets 100kHz–1MHz range; open-circuit prohibited. |
| SYNC | External clock synchronization input | Accepts digital clock ≥200ns pulse width; requires RT set 20% below SYNC frequency. |
| PGOOD | Open-collector output status | Asserts low when INTVCC > 2.7V and FBX within ±5% of regulation voltage. |
| EN/UVLO | Enable and input undervoltage detection | 1.22V falling threshold with programmable hysteresis; pulls down 2.2µA to enable rising-edge hysteresis. |
| SENSE | Current sense input | Kelvin-connected to FET source resistor; referenced to GND; triggers immediate switch turn-off if >50mV. |
| GATE | N-channel MOSFET gate driver | Swings between INTVCC and GND; 20ns rise/fall into 3.3nF; forced low during shutdown 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-polarity feedback architecture | Single FBX pin supports +1.6V or –0.8V regulation-eliminates need for separate topology-specific controllers. |
| Programmable frequency foldback | Reduces switching frequency during start-up or short-circuit to maintain peak inductor current within safe limits. |
| Two independent LDOs (VIN & DRIVE) | Enables flexible power sourcing: DRIVE LDO delivers 4.75V at 60mA; VIN LDO delivers 3.75V at 60mA-reduces heat generation vs. single-supply ICs. |
| Accurate PGOOD reporting | Window comparator on FBX provides reliable output-valid indication with 80mV (positive) or 40mV (negative) tolerance bands. |
| Low minimum on/off time | 170ns minimum on- and off-times support high-frequency operation while maintaining stable duty cycle control down to ~17% min / ~83% max at 1MHz. |
Applications
| Automotive Post-Regulator | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V battery rail to stable 12V output despite cold-crank (4.5V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: SEPIC controller maintaining constant output during wide VIN excursions; PGOOD signals ECU readiness. Use Value: Eliminates need for discrete pre-regulator stages; 42V absolute max rating withstands automotive transients without protection circuitry. | Use Scenario: Generating isolated ±15V rails from 24V industrial bus for op-amp biasing and sensor excitation. IC Role / Device Role / Timing Role: Inverting converter topology producing negative output; synchronized switching minimizes EMI in dense PCB layouts. Use Value: Single-controller solution replaces dual ICs; 100kHz–1MHz frequency tuning optimizes filter size vs. efficiency for space-constrained PLC modules. |
| Portable Medical Instrument | Datacom Boost Converter |
Use Scenario: Powering high-voltage piezoelectric drivers (up to 100V) from 3.7V Li-ion battery in handheld ultrasound probe. IC Role / Device Role / Timing Role: Boost controller with programmable soft-start preventing inrush into capacitive loads; SS capacitor sets 10ms ramp time. Use Value: 50mV SENSE threshold enables use of 5mΩ shunt-minimizing power loss and board area in battery-operated devices. | Use Scenario: Stepping 5V intermediate rail to 12V for optical transceiver modules in 10G Ethernet switches. IC Role / Device Role / Timing Role: High-efficiency boost controller operating at 500kHz; GATE driver's 20ns edges reduce switching losses in GaN FETs. Use Value: Exposed-pad MSOP-12 achieves 40°C/W θJA, enabling 2A continuous output without heatsink in compact front-panel designs. |
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 | Integrated 2-switch synchronous buck-boost controller; no external FET required; 4V–36V input; supports I²C telemetry. | Replaces discrete FET + controller design with monolithic solution; lacks negative-output capability. | Choose LTC3789EMSE#TRPBF for higher integration and telemetry where negative output is unnecessary. |
| MAX17595ATP+T | High-voltage current-mode boost/SEPIC controller; 4.5V–60V input; 500kHz fixed frequency; no negative-output mode. | Higher input voltage rating suits 48V telecom; lacks FBX polarity auto-detection and PGOOD window accuracy. | Choose MAX17595ATP+T for 48V systems requiring robust overvoltage protection but not dual-polarity regulation. |
Compared with LTC3789EMSE#TRPBF and MAX17595ATP+T, LT3759EMSE#TRPBF uniquely supports both positive and negative outputs from one feedback pin, retains full programmability (frequency, soft-start, UVLO), and offers superior thermal performance in MSOP-12-making it optimal for space-constrained, multi-rail industrial and automotive converters where topology flexibility is critical.
Availability
LT3759EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive post-regulators, industrial distributed supplies, portable medical instruments, and datacom boost converters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3759EMSE#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 analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LT3759 product line delivers wide-input, multi-topology DC/DC controllers optimized for harsh-environment applications including automotive battery regulation, industrial power distribution, and portable high-voltage instrumentation.
FAQ
What is the maximum input voltage rating for LT3759EMSE#TRPBF?
The LT3759EMSE#TRPBF has an absolute maximum input voltage rating of 42V on the VIN pin, verified per Absolute Maximum Ratings table. This allows direct connection to 24V or 36V industrial buses and withstands automotive load-dump transients without external clamping. Operation above 36V is possible only with careful attention to power dissipation and thermal design, as specified in the Electrical Characteristics table.
Can LT3759EMSE#TRPBF generate both positive and negative output voltages?
Yes, LT3759EMSE#TRPBF supports both polarities using a single FBX pin: it regulates to +1.6V for boost/SEPIC configurations (positive VOUT) and to –0.8V for inverting configurations (negative VOUT). The internal dual-error-amplifier architecture automatically selects the active amplifier based on FBX voltage polarity, eliminating manual configuration or external logic.
How is the switching frequency programmed on LT3759EMSE#TRPBF?
The switching frequency of LT3759EMSE#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. Alternatively, the SYNC pin accepts an external clock signal (≥200ns pulse width), with RT configured for 20% lower frequency to ensure reliable synchronization.
What is the purpose of the DRIVE pin on LT3759EMSE#TRPBF?
The DRIVE pin on LT3759EMSE#TRPBF supplies the DRIVE LDO, which regulates INTVCC to 4.75V. It can be connected to a quasi-regulated rail (e.g., DC/DC output) to improve efficiency and reduce self-heating versus sourcing from VIN. If unused, DRIVE must be tied to VIN; leaving it floating violates Absolute Maximum Ratings and risks malfunction.
Does LT3759EMSE#TRPBF provide output voltage status monitoring?
Yes, LT3759EMSE#TRPBF provides precise output status via the PGOOD pin-an open-collector output that asserts low when INTVCC exceeds 2.7V and FBX is within ±5% of its regulation voltage (±80mV for +1.6V, ±40mV for –0.8V). This enables system-level power sequencing and fault detection without external comparators.
LT3759EMSE#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
LT3759EMSE#TRPBF FAQ
1.How can I place an order for LT3759EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3759EMSE#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 LT3759EMSE#TRPBF reliable?
The price and inventory of LT3759EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3759EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3759EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3759EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3759EMSE#TRPBF?
LT3759EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3759EMSE#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 LT3759EMSE#TRPBF?
For technical support, including LT3759EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3759EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3759EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3759EMSE#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 LT3759EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3759EMSE#TRPBF?
All LT3759EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3759EMSE#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 LT3759EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3759EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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