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Analog Devices Inc. LT3759HMSE#TRPBF
- Part No.:
- LT3759HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3759HMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,857
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Product details
Overview
LT3759HMSE#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, programmable 100kHz–1MHz switching frequency, and operates across –40°C to 150°C junction temperature - ideal for automotive post-regulation and industrial distributed supplies.
For engineers reviewing the LT3759HMSE#TRPBF datasheet, LT3759HMSE#TRPBF pinout, LT3759HMSE#TRPBF application, or LT3759HMSE#TRPBF equivalent, key selection criteria include its dual-polarity feedback architecture, PGOOD status reporting, INTVCC LDO sourcing flexibility (VIN or DRIVE), soft-start programmability, and guaranteed high-temperature operation up to 150°C.
Technical Context
The LT3759HMSE#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 via FBX. Its internal slope compensation ensures stability across wide duty-cycle ranges.
It integrates two independent LDOs: a DRIVE-powered 4.75V regulator and a VIN-powered 3.75V regulator, both feeding INTVCC; automatic LDO selection avoids reverse current flow. The device also embeds frequency foldback during start-up or short-circuit, PGOOD window comparators (±5% tolerance), and precise EN/UVLO with 20mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.6V to 42V - supports direct connection to automotive battery (cold-crank down to 1.6V) and industrial rails without pre-regulation. |
| Output Polarity Support | Positive or negative regulated output via single FBX pin - eliminates need for separate controllers in bipolar supply designs. |
| SENSE Threshold | 50mV ±4mV - enables accurate, low-loss current sensing with standard 5mΩ shunts and reduces power loss in high-current applications. |
| Switching Frequency | 100kHz to 1MHz (resistor-programmable) - allows optimization between efficiency (lower f) and component size (higher f). |
| Operating Temperature | –40°C to 150°C (junction) - qualified for under-hood automotive and high-ambient industrial environments. |
| PGOOD Accuracy | ±5% of regulation voltage (±80mV at +1.6V, ±40mV at –0.8V) - provides reliable output-valid indication for system sequencing and fault detection. |
| Shutdown Current | <1µA - enables ultra-low-power standby in battery-backed systems without external disconnect switches. |
Pinout & Package
LT3759HMSE#TRPBF is housed in a 12-lead plastic MSOP package with exposed pad (Pin 13 = GND), offering θJA ≈ 40°C/W when soldered to a full PCB ground plane. The exposed pad must be electrically and thermally connected to GND for safe operation at rated junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VC | Error amplifier compensation node | Connects external RC network to stabilize voltage loop; clamped during soft-start to limit peak inductor current. |
| 2 FBX | Dual-polarity feedback input | Sets +1.6V or –0.8V regulation point; also drives PGOOD window comparators and modulates frequency during faults. |
| 3 SS | Soft-start control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; discharged during UVLO or thermal lockout to reinitiate controlled start-up. |
| 4 RT | Frequency programming | Resistor-to-GND sets oscillator frequency; open-circuit disables operation - no internal pull-up/down. |
| 5 SYNC | External clock synchronization | Accepts TTL/CMOS clock edge; requires RT set 20% below sync frequency; ignored if INTVCC < 2.7V or during foldback. |
| 6 PGOOD | Open-collector status output | Asserts low when INTVCC > 2.7V and FBX within ±5% of regulation - used for power-good sequencing and fault latching. |
| 7 EN/UVLO | Enable and input undervoltage detect | 1.22V falling threshold with 20mV hysteresis; internal 2.2µA pull-down enables resistor-based rising threshold programming. |
| 8 VIN | Main supply input | Powers internal bias and VIN LDO; bypass with ≥1µF ceramic capacitor; absolute max 42V. |
| 9 DRIVE | LDO supply input | Alternative source for INTVCC LDO (4.75V); tie to VIN if unused; must be bypassed with ≥1µF capacitor. |
| 10 INTVCC | Internal regulated supply | 4.75V (DRIVE-fed) or 3.75V (VIN-fed); powers gate driver and logic; bypass with ≥4.7µF ceramic capacitor. |
| 11 GATE | N-MOSFET gate driver output | Swings between INTVCC and GND; 0.05V VOL ensures strong turn-off; rise/fall times <20ns into 3300pF. |
| 12 SENSE | Current sense input | Kelvin-connected to shunt's high-side; 50mV threshold enables precision current limiting without gain errors. |
| 13 GND | Ground / Exposed Pad | Thermal and electrical reference; exposed pad must be soldered to PCB ground plane for thermal integrity and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity feedback architecture | Single FBX pin supports +1.6V or –0.8V regulation - simplifies PCB layout and BOM by eliminating topology-specific controllers. |
| Programmable frequency with sync capability | 100kHz–1MHz range set by one resistor; SYNC pin accepts external clock - enables EMI reduction and multi-rail synchronization. |
| Two-source INTVCC LDO | DRIVE-fed (4.75V) or VIN-fed (3.75V) regulation - allows efficient gate drive from intermediate rail or main input, avoiding dropout issues. |
| Accurate PGOOD with window detection | ±5% output voltage window referenced to FBX regulation points - provides deterministic power-good assertion without external comparators. |
| Integrated soft-start and frequency foldback | SS pin controls VC clamp; foldback activates during low-VOUT conditions - prevents inductor saturation and MOSFET overstress at startup/short-circuit. |
| High-temp grade H-suffix qualification | Guaranteed operation from –40°C to 150°C junction - meets AEC-Q100 Grade 0 requirements for under-hood automotive use. |
Applications
| Automotive Post-Regulation | Industrial Distributed Power |
|---|---|
|
Use Scenario: Regulating 12V battery rail to stable 12V or –12V for infotainment, ADAS sensors, or CAN transceivers during cold-crank (down to 1.6V) or load-dump events. IC Role / Device Role / Timing Role: Primary DC/DC controller managing boost/SEPIC conversion; FBX sets output polarity; PGOOD sequences downstream logic. Use Value: Maintains regulated output across extreme automotive voltage transients without external supervision or additional protection circuitry. |
Use Scenario: Generating isolated ±15V rails from 24V or 48V factory bus for PLC I/O modules, motor drivers, or analog signal conditioning. IC Role / Device Role / Timing Role: Controller for non-isolated SEPIC/inverting converters; RT sets 300kHz switching; SYNC aligns multiple rails to reduce beat frequencies. Use Value: Eliminates need for separate positive/negative controllers while supporting wide input range and high reliability in harsh environments. |
| Portable Medical Equipment | Test & Measurement Supplies |
|
Use Scenario: Powering portable ultrasound or patient monitors requiring clean ±5V or ±12V from single-cell Li-ion (2.7V–4.2V) or 2S packs. IC Role / Device Role / Timing Role: Inverting converter controller; soft-start prevents inrush into large capacitive loads; low shutdown IQ extends battery life. Use Value: Delivers bipolar rails directly from low-voltage batteries with <1µA quiescent current in shutdown - critical for long standby duration. |
Use Scenario: Programmable bench supplies needing fast transient response and precise output tracking across ±10V ranges. IC Role / Device Role / Timing Role: High-accuracy current-mode controller; 50mV SENSE threshold enables tight current limiting; PGOOD confirms regulation before enabling DUT. Use Value: Enables sub-1% output accuracy and repeatable current-limit behavior without calibration - reducing test setup complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3758EMSE#TRPBF | Same architecture but rated for –40°C to 125°C; lacks H-grade thermal qualification and has higher PGOOD trip hysteresis (±7.5%). | Suitable for commercial/industrial ambient environments only; not qualified for under-hood automotive use. | Select LT3759HMSE#TRPBF when operation above 125°C junction or AEC-Q100 compliance is required. |
| MAX17595ATP+T | Wide-input (4.5V–60V) boost/SEPIC controller with integrated 0.5Ω MOSFET driver; no native inverting mode; PGOOD threshold ±3%. | Requires external high-side N-MOSFET for inverting topologies; optimized for high-efficiency boost rather than bipolar flexibility. | Choose MAX17595ATP+T when input >4.5V and inverting output is not needed; prefer LT3759HMSE#TRPBF for true dual-polarity support and ultra-wide VIN. |
Compared with LT3758EMSE#TRPBF and MAX17595ATP+T, the LT3759HMSE#TRPBF uniquely combines guaranteed 150°C operation, single-pin bipolar feedback, and native inverting capability - making it the only option for high-reliability, thermally demanding, dual-rail applications where topology flexibility is essential.
Availability
LT3759HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive post-regulation, industrial distributed power, and portable medical equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3759HMSE#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 full product support, documentation, and manufacturing continuity for all Linear-branded parts including the LT3759 series.
The LT3759 product line was designed specifically for high-reliability, wide-input DC/DC controller applications requiring flexible topology support (boost/SEPIC/inverting), robust thermal performance, and precise regulation in automotive and industrial systems.
FAQ
What is the maximum junction temperature rating for LT3759HMSE#TRPBF?
The LT3759HMSE#TRPBF is guaranteed to operate continuously over a junction temperature range of –40°C to 150°C. This H-grade qualification exceeds standard industrial and automotive requirements and is validated per Analog Devices' high-temperature reliability testing protocols. Derating guidelines apply above 125°C to ensure long-term reliability.
How does the LT3759HMSE#TRPBF support both positive and negative output voltages?
The LT3759HMSE#TRPBF uses a dual-error-amplifier architecture tied to the FBX pin: one amplifier regulates at +1.6V for positive outputs (e.g., boost/SEPIC), the other at –0.8V for negative outputs (e.g., inverting). The active amplifier is automatically selected based on FBX voltage polarity and topology configuration - no external mode pins or configuration registers are required.
Can the LT3759HMSE#TRPBF synchronize to an external clock, and what are the timing constraints?
Yes, the LT3759HMSE#TRPBF accepts synchronization via its SYNC pin, which triggers on the rising edge of an external digital clock. To avoid instability, the RT resistor must be selected to program an internal frequency 20% lower than the SYNC frequency. The SYNC pulse width must exceed 200ns, and the feature is disabled if INTVCC falls below 2.7V or during frequency foldback.
What is the purpose of the DRIVE pin on the LT3759HMSE#TRPBF?
The DRIVE pin supplies the internal INTVCC LDO regulator with an alternative source - typically a quasi-regulated intermediate rail (e.g., 5V or 12V from a prior stage). When driven, it enables a 4.75V INTVCC output with lower dropout than the VIN-fed LDO (3.75V). If unused, DRIVE must be tied to VIN; leaving it floating may cause erratic operation or damage.
Does the LT3759HMSE#TRPBF require external components for soft-start, and how is it configured?
Yes, soft-start is implemented using an external capacitor on the SS pin. A 10µA internal current source charges the capacitor from GND to 2.5V, controlling the VC clamp ramp rate. Typical values range from 10nF (fast start) to 100nF (gradual ramp); discharge occurs automatically during EN/UVLO or INTVCC undervoltage events to reinitiate controlled startup.
LT3759HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LT3759HMSE#TRPBF FAQ
1.How can I place an order for LT3759HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3759HMSE#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 LT3759HMSE#TRPBF reliable?
The price and inventory of LT3759HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3759HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3759HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3759HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3759HMSE#TRPBF?
LT3759HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3759HMSE#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 LT3759HMSE#TRPBF?
For technical support, including LT3759HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3759HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3759HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3759HMSE#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 LT3759HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3759HMSE#TRPBF?
All LT3759HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3759HMSE#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 LT3759HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3759HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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