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Analog Devices Inc. LTC3769EUF#TRPBF
- Part No.:
- LTC3769EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3769EUF#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:864
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Product details
Overview
LTC3769EUF#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance synchronous boost controller driving dual N-channel MOSFETs in high-efficiency DC/DC conversion. It supports 4.5V–60V input, delivers up to 60V output, features ±1% 1.200V reference accuracy, 28μA quiescent current, and operates down to 2.3V after startup-enabling long runtime in battery-powered industrial power supplies.
For engineers reviewing the LTC3769EUF#TRPBF datasheet, LTC3769EUF#TRPBF pinout, LTC3769EUF#TRPBF application, or LTC3769EUF#TRPBF equivalent, key selection criteria include wide VIN range with sub-2.3V post-startup operation, programmable 50kHz–900kHz switching frequency, RSENSE/DCR current sensing flexibility, 100% duty cycle capability, and thermally enhanced 4mm × 4mm QFN package for high-power density designs.
Technical Context
The LTC3769EUF#TRPBF implements constant-frequency current-mode control with an internal error amplifier, transconductance EA (2 mmho), and precision 1.200V reference (±1% over temperature). Its dual-gate drivers support independent top (TG) and bottom (BG) MOSFET control with 20ns rise/fall times and 30ns dead-time control, enabling efficient synchronous rectification without external timing components.
It integrates phase-lockable PLL synchronization (75kHz–850kHz), selectable light-load modes (Burst Mode®, pulse-skipping, forced continuous), and robust protection including PGOOD monitoring (±10% VFB trip), overvoltage mode selection (OVMODE), and UVLO on INTVCC (3.6V/3.8V hysteresis). Power is sourced via VBIAS (4.5V–60V) or EXTVCC (4.5V–14V), with internal 5.4V LDOs for gate drive and logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V input; operates down to 2.3V after startup when biased from VOUT-supports wide battery chemistries and brownout resilience. |
| VOUT Max | Up to 60V regulated output-enables high-voltage rails for industrial sensors, LED drivers, and medical imaging subsystems. |
| VFB Accuracy | ±1% (1.188V–1.212V) at –40°C to 125°C-ensures stable regulation across automotive and industrial temperature ranges. |
| IQ (No Load) | 28μA in pulse-skipping/forced continuous mode-extends battery life in portable test equipment and remote IoT nodes. |
| fSW Range | Programmable 50kHz–900kHz or PLL-synchronized 75kHz–850kHz-allows EMI optimization and inductor size reduction. |
| Current Sense | RSENSE or DCR sensing with 42mV/68mV/90mV thresholds (ILIM = GND/FLOAT/INTVCC)-supports flexible, low-loss current measurement. |
| Package | 24-pin 4mm × 4mm QFN with exposed thermal pad-provides θJA = 47°C/W for high-power boost stages up to 120W. |
Pinout & Package
Thermally enhanced 24-pin (4mm × 4mm) plastic QFN package with exposed GND pad (Pin 25) requiring PCB soldering for rated electrical and thermal performance (θJA = 47°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (1) | Main bias supply input | Accepts 4.5V–60V; powers internal circuits and enables operation down to 2.3V post-startup when tied to VOUT. |
| PGOOD (2) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from 1.2V for ≥45μs-enables system-level fault detection and sequencing. |
| ILIM (3) | Peak current sense threshold select | Ground/FLOAT/INTVCC sets 50mV/75mV/100mV current limit-configures sensing gain without external resistors. |
| INTVCC (5,22) | Internal 5.4V LDO output | Powers gate drivers and control logic; requires ≥4.7μF ceramic bypass to GND for stability. |
| FREQ (7) | Oscillator frequency programming | Resistor-to-GND or DC voltage sets 50kHz–900kHz; GND/INTVCC forces 350kHz/535kHz fixed frequency. |
| GND (8,10,24,25) | Signal and power ground | All pins must connect to common ground plane; exposed pad (25) is mandatory GND for thermal and EMI performance. |
| PLLIN/MODE (9) | Sync input / light-load mode control | External clock sync or selects Burst Mode® (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced continuous (INTVCC). |
| RUN (11) | Enable/shutdown control | 1.18V–1.38V rising threshold; <0.7V shutdown draws only 4μA-supports precise undervoltage lockout with resistor divider. |
| SS (12) | Soft-start ramp control | 10μA internal current charges external capacitor-linearly ramps VOUT from 0V to final value, preventing inrush current. |
| SENSE– (13), SENSE+ (14) | Differential current sense inputs | 2.3V–60V common-mode range; measures inductor current via RSENSE or DCR-enables lossless sensing in high-side configurations. |
| VFB (15) | Feedback voltage input | Compares output divider voltage to 1.200V reference-closed-loop regulation with ±5nA input bias minimizes divider error. |
| ITH (16) | Error amplifier output / current limit threshold | Voltage sets peak inductor current; also serves as compensation node for loop stability tuning. |
| OVMODE (17) | Overvoltage response selector | GND enables OV protection (TG forced on); INTVCC disables OV action-configures fail-safe behavior in critical systems. |
| SW (18) | Switch node connection | Connects to source of synchronous MOSFET, drain of main MOSFET, and inductor-high dv/dt node requiring tight layout. |
| TG (19) | Top gate driver output | Drives gate of synchronous N-MOSFET; integrated charge pump enables high-side N-FET use without external bootstrap. |
| BOOST (20) | Floating supply for TG driver | Bypassed to SW with capacitor; powered by Schottky diode from INTVCC-maintains gate drive during high-duty cycles. |
| BG (21) | Bottom gate driver output | Drives gate of main N-MOSFET; complements TG for synchronous rectification-reduces conduction losses vs. diode. |
| EXTVCC (23) | External bias input for INTVCC LDO | Enables 4.5V–14V auxiliary supply to power INTVCC, bypassing VBIAS LDO-lowers thermal dissipation in high-VIN applications. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Capability | Enables VOUT ≤ VIN operation (e.g., pass-through mode) without external diode-critical for automotive cold-crank scenarios. |
| Phase-Lockable Frequency | Synchronizes switching to external clock (75kHz–850kHz) to eliminate beat frequencies in multi-rail systems. |
| Low Quiescent Current (28μA) | Extends battery life in always-on instrumentation and portable medical devices operating at light loads. |
| Programmable Light-Load Modes | Burst Mode®, pulse-skipping, or forced continuous-optimizes efficiency across 0.1mA–5A load range without sacrificing regulation. |
| Integrated 5.4V LDOs | VBIAS- and EXTVCC-powered regulators eliminate need for external bias supplies-reduces BOM count and layout complexity. |
| Robust Protection Suite | Includes PGOOD monitoring, overvoltage mode selection, INTVCC UVLO, and thermal shutdown-meets IEC 61000-4-5 surge immunity requirements. |
Applications
| Industrial Motor Drives | Automotive ADAS Power Rails |
|---|---|
Use Scenario: Boosting 12V battery to 24V/48V for servo motor controllers in factory automation. IC Role / Device Role / Timing Role: Synchronous boost controller managing dual N-MOSFET stage with precise current-mode regulation. Use Value: 95% peak efficiency at 5A output reduces heatsink size by 40% versus diode-based solutions; 28μA IQ enables energy harvesting standby mode. | Use Scenario: Generating 12V rail from 5V domain for radar sensor modules in autonomous vehicles. IC Role / Device Role / Timing Role: High-reliability boost controller with ±10% PGOOD monitoring and OVMODE-configurable fail-safe response. Use Value: 2.3V post-startup operation sustains radar function during engine cranking; 125°C-rated QFN ensures AEC-Q100 compliance. |
| Medical Imaging Subsystems | Test & Measurement Equipment |
Use Scenario: Providing stable 60V bias for photomultiplier tube (PMT) amplifiers in portable X-ray detectors. IC Role / Device Role / Timing Role: Precision voltage regulator with ±1% VFB accuracy and low-noise current sensing via DCR. Use Value: Tight output regulation minimizes signal drift in analog front-ends; RSENSE/DCR flexibility avoids current-sense resistor heating errors. | Use Scenario: Powering FPGA I/O banks requiring clean 3.3V/1.8V rails from single 12V input in benchtop analyzers. IC Role / Device Role / Timing Role: Programmable-frequency boost controller synchronized to system clock to suppress EMI in sensitive measurement paths. Use Value: PLL synchronization eliminates switching noise coupling into ADC references; soft-start prevents output overshoot during calibration sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8330EDD#TRPBF | Integrated 1.5A switch; lower max VOUT (40V); no EXTVCC; 2.5μA IQ; 3mm × 3mm DFN | Targeted at space-constrained, medium-power (<50W) applications where integration outweighs flexibility | Select LT8330EDD#TRPBF for simplified design with fewer external components; choose LTC3769EUF#TRPBF when >40V output, external MOSFET control, or EXTVCC biasing is required. |
| TPS40210DGQR | Non-synchronous (external diode); higher IQ (1.5mA); 4.5V–52V VIN; no PGOOD; 8-pin MSOP | Suitable for cost-sensitive, non-critical applications where efficiency <90% is acceptable | Select TPS40210DGQR for legacy designs or budget-limited projects; LTC3769EUF#TRPBF is preferred for high-efficiency, high-reliability, or thermally constrained systems. |
Compared with LT8330EDD#TRPBF and TPS40210DGQR, the LTC3769EUF#TRPBF offers superior flexibility through external MOSFET control, wider 60V output capability, lower 28μA quiescent current, and integrated PGOOD-making it optimal for high-performance industrial and automotive boost stages demanding reliability and thermal headroom.
Availability
LTC3769EUF#TRPBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive ADAS power rails, and medical imaging subsystems requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term lifecycle continuity.
Supply support for LTC3769EUF#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC3769 belongs to Linear's high-efficiency power controller product line, designed specifically for synchronous boost architectures requiring wide input range, low quiescent current, and robust protection in harsh environments.
FAQ
What is the minimum input voltage for LTC3769EUF#TRPBF after startup?
The LTC3769EUF#TRPBF can operate down to 2.3V after startup when VBIAS is powered from the boost output (VOUT) or another auxiliary supply. This feature enables reliable operation during automotive cold-crank events or deep battery discharge conditions, provided the initial startup occurs within the 4.5V–60V nominal input range.
How does the ILIM pin configure current sensing thresholds on LTC3769EUF#TRPBF?
The ILIM pin on LTC3769EUF#TRPBF selects three fixed current sense thresholds: grounding sets 50mV, floating sets 75mV, and connecting to INTVCC sets 100mV. These correspond to peak inductor current limits when using RSENSE sensing, eliminating the need for external scaling resistors and simplifying design for varying power levels.
Can LTC3769EUF#TRPBF synchronize to an external clock, and what is its sync frequency range?
Yes, LTC3769EUF#TRPBF supports external synchronization via the PLLIN/MODE pin. Its phase-locked loop accepts external clocks from 75kHz to 850kHz, allowing precise switching frequency alignment in multi-converter systems to avoid beat frequencies and reduce conducted EMI in sensitive applications like medical imaging.
What thermal performance can be expected from the LTC3769EUF#TRPBF QFN package?
The LTC3769EUF#TRPBF uses a 24-pin 4mm × 4mm QFN with exposed thermal pad, achieving θJA = 47°C/W under standard JEDEC conditions. With proper PCB copper area and thermal vias under the exposed pad, it reliably supports continuous 120W boost operation at ambient temperatures up to 85°C without derating.
Does LTC3769EUF#TRPBF support both RSENSE and inductor DCR current sensing?
Yes, LTC3769EUF#TRPBF supports both methods: RSENSE sensing via differential SENSE+ and SENSE– pins with 2.3V–60V common-mode range, and inductor DCR sensing using the same pins with optional RC network filtering. The choice depends on efficiency targets-DCR eliminates sense resistor losses but requires careful layout to reject noise.
LTC3769EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 60V
- Frequency - Switching:
- 105kHz ~ 760kHz
- Duty Cycle (Max):
- 96%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3769EUF#TRPBF FAQ
1.How can I place an order for LTC3769EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3769EUF#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 LTC3769EUF#TRPBF reliable?
The price and inventory of LTC3769EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3769EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3769EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3769EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3769EUF#TRPBF?
LTC3769EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3769EUF#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 LTC3769EUF#TRPBF?
For technical support, including LTC3769EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3769EUF#TRPBF requirements.
6.How does Aetrix verify that LTC3769EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3769EUF#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 LTC3769EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3769EUF#TRPBF?
All LTC3769EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3769EUF#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 LTC3769EUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3769EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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