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Analog Devices Inc. LT3759EMSE#PBF
- Part No.:
- LT3759EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3759EMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,661
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Product details
Overview
LT3759EMSE#PBF 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 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 LT3759EMSE#PBF datasheet, LT3759EMSE#PBF pinout, LT3759EMSE#PBF application, or LT3759EMSE#PBF equivalent, key selection factors 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 LT3759EMSE#PBF implements fixed-frequency current-mode control with dual error amplifiers-one for +1.6V regulation (positive outputs), 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: DRIVE LDO (4.6–4.9V output, powered from DRIVE pin) and VIN LDO (3.6–3.9V output, powered from VIN), both feeding INTVCC. The internal oscillator supports resistor-programmed frequency or external synchronization via SYNC pin with 200ns minimum pulse width.
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 - selected automatically by FBX voltage polarity; eliminates need for separate controllers per polarity. |
| SENSE Threshold | 46–54mV (typ 50mV) - enables accurate current limiting with low-value, low-power sense resistors (e.g., 5mΩ at 10A). |
| Switching Frequency | 100kHz to 1MHz - set by RT resistor or synchronized externally; higher frequencies reduce inductor size, lower frequencies improve efficiency. |
| PGOOD Accuracy | ±5% window around regulation voltage - provides reliable output-valid indication for system sequencing and fault detection. |
| Shutdown Current | <1µA - ensures ultra-low quiescent draw during vehicle sleep mode or portable device standby. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and high-ambient industrial environments. |
Pinout & Package
LT3759EMSE#PBF 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; sets bandwidth and phase margin of feedback control. |
| FBX | Feedback input for ± output regulation | Dual-reference input (1.6V for positive, –0.8V for negative); also enables PGOOD reporting and frequency foldback. |
| SS | Soft-start timing control | 10µA pull-up to 2.5V rail; capacitor value sets ramp time to limit inrush current during startup or fault recovery. |
| RT | Oscillator frequency programming | Resistor to GND sets switching frequency; open-circuit disables operation - must not be left floating. |
| SYNC | External clock synchronization input | Accepts digital clock edge; requires RT setting 20% below sync frequency to avoid jitter or loss of lock. |
| PGOOD | Open-collector output status flag | Asserts low when INTVCC > 2.7V and FBX within ±5% of regulation voltage - used for power-good sequencing. |
| EN/UVLO | Enable and input undervoltage lockout | 1.22V falling threshold with programmable hysteresis; resets soft-start on undervoltage event. |
| SENSE | Current sense amplifier input | Kelvin-connected to sense resistor's high-side terminal; rejects noise and trace resistance errors. |
| GATE | N-channel MOSFET gate driver output | Drives external FET between INTVCC and GND; clamped low during shutdown or INTVCC UVLO. |
| INTVCC | Internally regulated supply rail | 4.75V (DRIVE-powered) or 3.75V (VIN-powered); bypass with ≥4.7µF ceramic capacitor adjacent to pin. |
| VIN | Main input supply and VIN LDO input | Bypass with ≥1µF ceramic capacitor; powers internal bias and VIN LDO; withstands 42V absolute max. |
| 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 both +1.6V and –0.8V regulation references - simplifies BOM and layout across boost, SEPIC, and inverting designs. |
| Programmable soft-start | Capacitor-controlled ramp on SS pin limits peak inductor current during startup and fault recovery - prevents inductor saturation and MOSFET overstress. |
| Two integrated LDOs | DRIVE LDO (4.75V) and VIN LDO (3.75V) independently power INTVCC - enables flexible supply sourcing and improves efficiency vs. single-LDO alternatives. |
| Accurate PGOOD reporting | Window comparator on FBX drives open-drain PGOOD with ±5% tolerance - provides deterministic power-good signaling for microcontroller reset and system enable logic. |
| Frequency foldback during fault | Reduces switching frequency when FBX nears GND (e.g., short-circuit or start-up) - maintains current limit compliance without sacrificing loop stability. |
Applications
| Automotive Post-Regulator | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V battery rail to stable 12V output after alternator transients and cold-crank dips down to 1.6V. IC Role / Device Role / Timing Role: Primary controller managing boost/SEPIC conversion with EN/UVLO hysteresis for robust start-stop operation. Use Value: Maintains regulated output during 1.6V–42V input swings; PGOOD enables ECU power sequencing; exposed pad ensures thermal reliability under hood. | Use Scenario: Generating isolated ±15V rails from 24V industrial bus for analog signal conditioning and op-amp biasing. IC Role / Device Role / Timing Role: Dual-polarity controller implementing inverting and SEPIC stages with shared FBX feedback path. Use Value: Eliminates need for separate positive/negative controllers; 50mV SENSE threshold enables precise current limiting across load steps. |
| Portable Medical Equipment | Datacom Power Module |
Use Scenario: Powering portable ultrasound or patient monitor subsystems from single-cell Li-ion (2.7–4.2V) with 5V/–5V outputs. IC Role / Device Role / Timing Role: Low-IQ (350–450µA) controller enabling multi-hour battery life; SS pin manages capacitor charging surge. Use Value: Sub-1µA shutdown current extends shelf life; soft-start prevents battery voltage sag during turn-on; compact MSOP-12 saves board space. | Use Scenario: Providing 48V-to-12V intermediate bus in telecom line cards where EMI and thermal density are critical. IC Role / Device Role / Timing Role: High-frequency (600kHz+) SEPIC controller synchronized to system clock via SYNC pin to reduce beat frequencies. Use Value: 1MHz capability shrinks magnetics; SYNC compatibility enables deterministic EMI filtering; DRIVE LDO allows gate drive from local 5V rail. |
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#PBF | 4-switch synchronous buck-boost controller; supports bidirectional power flow; no native inverting mode. | Requires external MOSFETs for all four switches; better suited for wide-input, wide-output-range applications where efficiency >90% is mandatory. | Select LTC3789EMSE#PBF only when synchronous rectification and >90% efficiency across 4:1 input/output ratios are required - not a drop-in replacement. |
| MAX17595ATP+T | Single-ended boost controller with 4.5V–60V input; fixed 1.215V FB reference; no negative output support. | Lacks dual-polarity feedback; requires external inverting stage for negative rails; higher minimum input voltage limits cold-crank use. | Choose MAX17595ATP+T for high-voltage boost-only designs where FBX polarity flexibility is unnecessary and 60V abs-max rating is critical. |
Compared with LTC3789EMSE#PBF and MAX17595ATP+T, the LT3759EMSE#PBF uniquely combines single-pin dual-polarity regulation, 1.6V cold-crank capability, and inverting topology support - making it irreplaceable for cost-sensitive, space-constrained automotive and portable systems needing both positive and negative outputs.
Availability
LT3759EMSE#PBF is available at Aetrix Electronics and suitable for automotive post-regulators, industrial distributed supplies, portable medical equipment, and datacom power modules requiring stable component supply across extended temperature and input voltage ranges.
Supply support for LT3759EMSE#PBF 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, datasheets, and application engineering for legacy Linear parts including the LT3759 series.
The LT3759 product line was designed specifically for high-reliability, wide-input DC/DC control in automotive, industrial, and portable power systems - emphasizing cold-crank operation, dual-polarity flexibility, and thermal robustness in exposed-pad MSOP packages.
FAQ
What is the minimum input voltage supported by the LT3759EMSE#PBF?
The LT3759EMSE#PBF supports a minimum input voltage of 1.6V across its full operating temperature range (–40°C to 125°C), enabling reliable operation during automotive cold-crank events. This specification is guaranteed per the Absolute Maximum Ratings table and confirmed in Electrical Characteristics under VIN Operating Voltage (min 1.6V). Below 1.6V, the internal bias circuitry cannot maintain regulation, and INTVCC may fall below its 2.4V enable threshold, disabling PGOOD and SYNC functions. The LT3759EMSE#PBF remains functional down to 1.6V even with EN/UVLO tied directly to VIN.
How does the LT3759EMSE#PBF regulate negative output voltages?
The LT3759EMSE#PBF regulates negative outputs using its dual-error-amplifier architecture: when the FBX pin voltage is pulled below GND (e.g., via resistor divider from negative VOUT), the –0.8V reference amplifier activates while the +1.6V amplifier idles. The VC pin then controls the external N-channel MOSFET to sustain inverting converter operation. This behavior is documented in the Block Diagram (Figure 1), Applications Information section, and Electrical Characteristics (FBX Regulation Voltage for FBX < 0V = –0.815V to –0.785V). The LT3759EMSE#PBF requires no mode-select pins - polarity is determined solely by FBX voltage sign.
Can the LT3759EMSE#PBF be synchronized to an external clock, and what are the requirements?
Yes, the LT3759EMSE#PBF can be synchronized to an external clock via the SYNC pin. The external clock must have a minimum pulse width of 200ns and a logic-high level ≥1.5V. To ensure reliable locking, the RT resistor must be selected to program an internal oscillator frequency 20% slower than the SYNC frequency - e.g., for a 500kHz sync signal, RT should be set for ~400kHz. The SYNC function is disabled if INTVCC falls below 2.7V or during FBX frequency foldback. These requirements are specified in the Absolute Maximum Ratings, Electrical Characteristics (SYNC Input High/Low), and Applications Information sections of the LT3759EMSE#PBF datasheet.
What is the purpose of the exposed pad (Pin 13) on the LT3759EMSE#PBF MSOP package?
The exposed pad (Pin 13) on the LT3759EMSE#PBF is electrically and thermally connected to GND and must be soldered directly to the PCB ground plane. It reduces thermal resistance (θJA ≈ 35–40°C/W) to prevent junction temperature exceedance during high-current operation, especially when driving large gate-charge MOSFETs at high frequencies. Per the Pin Configuration diagram and Applications Information, failure to solder the pad degrades thermal performance and may trigger thermal lockout. The pad is not optional - it is a mandatory part of the thermal and electrical design, as confirmed in the "EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB" note.
Does the LT3759EMSE#PBF support programmable input undervoltage lockout (UVLO), and how is it configured?
Yes, the LT3759EMSE#PBF supports programmable input UVLO via the EN/UVLO pin. A resistor divider from VIN to GND sets the falling threshold (nominal 1.22V), while an internal 2.2µA pull-down current generates rising hysteresis. The falling threshold voltage is calculated as VIN(FALLING) = 1.22 × (R3 + R4)/R4, and rising threshold adds hysteresis via VIN(RISING) = 2µA × R3 + VIN(FALLING). This configuration is validated in the Applications Information section and Figure 1 block diagram. An undervoltage condition on EN/UVLO resets soft-start and forces GATE low - a core safety feature confirmed across all LT3759EMSE#PBF operating conditions.
LT3759EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3759EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3759EMSE#PBF 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#PBF reliable?
The price and inventory of LT3759EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3759EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3759EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3759EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3759EMSE#PBF?
LT3759EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3759EMSE#PBF 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#PBF?
For technical support, including LT3759EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3759EMSE#PBF requirements.
6.How does Aetrix verify that LT3759EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3759EMSE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3759EMSE#PBF?
All LT3759EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3759EMSE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3759EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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