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Analog Devices Inc. LTC3769EUF#PBF
- Part No.:
- LTC3769EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3769EUF#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,173
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Product details
Overview
LTC3769EUF#PBF from Analog Devices (formerly Linear Technology) is a high-performance synchronous boost controller driving dual N-channel MOSFETs in step-up DC/DC converters. 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 when biased from VOUT. It enables high-efficiency 120W 12V-to-24V/5A power conversion in industrial and automotive systems.
For engineers reviewing the LTC3769EUF#PBF datasheet, LTC3769EUF#PBF pinout, LTC3769EUF#PBF application, or LTC3769EUF#PBF equivalent, key selection criteria include its wide VIN range (4.5V–60V), programmable switching frequency (50kHz–900kHz), RSENSE/DCR current sensing, 100% duty cycle capability, and thermally enhanced 4mm × 4mm QFN package with exposed ground pad.
Technical Context
The LTC3769EUF#PBF implements constant-frequency current-mode control with an internal error amplifier, transconductance EA (2 mmho), and precision 1.200V reference (±1% over temperature). Its peak-current sensing architecture uses SENSE+/SENSE– inputs with configurable thresholds (42–100 mV) set via ILIM pin logic states (GND/FLOAT/INTVCC).
It integrates dual gate drivers (TG/BG) with matched 20 ns rise/fall times, 1.2 Ω pull-up/pull-down resistances, and 30 ns dead-time control. The oscillator supports fixed-frequency programming (via FREQ pin resistor or voltage) or phase-locking to external clocks (75kHz–850kHz), while the PLLIN/MODE pin selects Burst Mode®, pulse-skipping, or forced continuous conduction at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V; operates down to 2.3V after startup when VBIAS is powered from VOUT - enables battery-backed and wide-input industrial supplies. |
| Output Voltage Range | Up to 60V regulated - supports high-voltage LED strings, industrial sensors, and isolated bias rails. |
| Reference Voltage Accuracy | ±1% (1.188V–1.212V) at –40°C to 125°C - ensures stable output regulation across automotive and industrial temperature ranges. |
| Quiescent Current | 28μA in no-load operation - extends runtime in battery-powered portable and remote monitoring systems. |
| Switching Frequency Range | 50kHz to 900kHz (programmable) or 75kHz to 850kHz (PLL-synchronized) - allows EMI optimization and inductor size reduction. |
| Current Sense Threshold | 42mV / 75mV / 100mV (selectable via ILIM pin) - enables precise overcurrent protection with minimal power loss in sense resistors. |
| Shutdown Current | 4μA - minimizes standby power draw during system sleep modes. |
Pinout & Package
Package: 24-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 25 = GND). Requires soldering of exposed pad to PCB for rated thermal performance (θJA = 47°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (Pin 1) | Main supply input | Accepts 4.5V–60V; powers internal LDOs and logic - can be tied to VIN or VOUT for low-VIN operation after startup. |
| PGOOD (Pin 2) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from 1.200V for ≥45μs - enables system-level fault detection and sequencing. |
| ILIM (Pin 3) | Current limit threshold select | Logic-selectable peak sense voltage (GND=42mV, FLOAT=75mV, INTVCC=100mV) - configures OCP without external components. |
| INTVCC (Pins 5, 22) | Internal 5.4V LDO output | Supplies gate drivers and control circuitry; requires ≥4.7μF ceramic bypass - decoupling critical for noise immunity and stability. |
| FREQ (Pin 7) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; voltage input or external clock (via PLLIN/MODE) enables synchronization - essential for multi-rail EMI management. |
| GND (Pins 8, 10, 24, Exposed Pad 25) | Signal and power ground | All pins must connect to common ground plane; exposed pad must be soldered - ensures thermal dissipation and low-noise reference integrity. |
| PLLIN/MODE (Pin 9) | Sync input / light-load mode control | Accepts external clock (75kHz–850kHz) or selects Burst Mode®/pulse-skipping/forced CCM - determines efficiency vs. ripple trade-off at light loads. |
| RUN (Pin 11) | Enable/shutdown control | 1.28V threshold (100mV hysteresis); <0.7V forces 4μA shutdown - supports controlled power sequencing and brown-out protection. |
| SS (Pin 12) | Soft-start ramp control | 10μA internal current charges external capacitor - linearly ramps VOUT from 0V to final value, preventing inrush current and output overshoot. |
| SENSE– / SENSE+ (Pins 13, 14) | Differential current sense inputs | Support RSENSE or DCR sensing; CM range 2.3V–60V - enables accurate current limiting across full input range without level-shifting. |
| VFB (Pin 15) | Error amplifier feedback input | Compares resistive divider output against 1.200V reference - closed-loop regulation point for output voltage accuracy and load transient response. |
| ITH (Pin 16) | Error amplifier output / current threshold | EA output drives peak current comparator; voltage sets IPEAK - direct interface for loop compensation and current limit programming. |
| OVMODE (Pin 17) | Overvoltage protection mode select | GND = OV latch-off with TG forced on; INTVCC = OV disabled - configurable safety behavior for fault-tolerant designs. |
| SW (Pin 18) | Switch node connection | Connects to source of sync FET, drain of main FET, and inductor - high dv/dt node requiring tight layout and Kelvin sensing. |
| TG (Pin 19) | Top gate driver output | Drives gate of synchronous N-MOSFET; 1.2Ω drive strength - supports fast turn-on/turn-off with minimal gate charge loss. |
| BOOST (Pin 20) | Floating supply for TG driver | Bypassed to SW via ceramic capacitor; charged from INTVCC via Schottky - enables high-side N-FET drive without bootstrap complexity. |
| BG (Pin 21) | Bottom gate driver output | Drives gate of main N-MOSFET; matched timing to TG - ensures precise dead-time control and prevents shoot-through. |
| EXTVCC (Pin 23) | External bias input for INTVCC LDO | Enables 4.5V–14V external supply to power INTVCC, bypassing VBIAS LDO - reduces thermal stress in high-input-voltage applications. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET control | Eliminates diode conduction loss, enabling >95% efficiency at full load and reduced thermal design burden in high-power boost stages. |
| 100% duty cycle capability | Allows VOUT ≈ VIN operation - supports seamless pass-through mode during input voltage surges or brownouts without dropout. |
| RSENSE or inductor DCR sensing | Reduces BOM count and board space by eliminating dedicated sense resistors; DCR option lowers power loss in high-current designs. |
| Phase-lockable oscillator (75kHz–850kHz) | Enables synchronized switching across multiple converters - critical for EMI compliance in dense power systems and automotive ECUs. |
| Thermally enhanced 4mm × 4mm QFN | Exposed pad and low θJA (47°C/W) allow >2A continuous output current without heatsinks in compact industrial modules. |
| Three light-load operating modes | Burst Mode® (28μA IQ), pulse-skipping, or forced CCM - lets designers optimize efficiency vs. output ripple based on real application requirements. |
Applications
| Automotive Infotainment Power Supply | Industrial Sensor Bias Rail |
|---|---|
Use Scenario: Generating stable 24V from 12V vehicle battery for LCD backlight drivers and camera modules under cold-crank (6V) and load-dump (36V) conditions. IC Role / Device Role / Timing Role: Primary synchronous boost controller regulating output with ±1% reference accuracy and 2.3V–60V input support. Use Value: Maintains uninterrupted operation during battery transients; 28μA quiescent current prevents parasitic drain during vehicle sleep mode. |
Use Scenario: Providing isolated 48V bias for MEMS pressure sensors and analog front-ends in factory automation PLCs with wide ambient temperature swings. IC Role / Device Role / Timing Role: High-voltage boost controller delivering regulated output up to 60V with robust overvoltage protection (OVMODE-configurable). Use Value: Eliminates need for external OV clamping; 100% duty cycle enables direct pass-through during brownout, preserving sensor data integrity. |
| Portable Medical Imaging Battery Pack | Military Handheld Radio PA Supply |
Use Scenario: Stepping up 2S Li-ion (6V–8.4V) to 12V for CCD image sensor bias in portable ultrasound devices with strict battery life targets. IC Role / Device Role / Timing Role: Low-IQ synchronous boost controller with programmable frequency (50kHz–900kHz) for EMI filtering flexibility. Use Value: 28μA no-load IQ extends operational time between charges; Burst Mode® maintains >85% efficiency at microamp loads. |
Use Scenario: Generating 28V RF power amplifier supply from 12V tactical battery in manpack radios subject to shock, vibration, and –40°C to +85°C operation. IC Role / Device Role / Timing Role: Robust boost controller with –40°C to 125°C guaranteed operation, EXTVCC support for auxiliary bias, and thermal pad grounding for reliability. Use Value: Exposed-pad QFN ensures stable thermal performance under sustained transmit duty cycles; 4μA shutdown current preserves battery during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8337EDD#PBF | Fixed 2MHz switching frequency; lower max VIN (40V); integrated 1.5A switch; no PLL sync or DCR sensing. | Better suited for compact, medium-power (<15W) applications where size trumps flexibility; lacks light-load mode selection. | Choose LT8337EDD#PBF for cost-sensitive, space-constrained designs needing simplicity over configurability. |
| TPS61088RHLR | Integrated 10A switch; max VIN 18V; no programmable frequency or external sync; only RSENSE sensing. | Targeted at consumer USB PD and portable electronics; unsuitable for automotive/industrial high-VIN or high-temp environments. | Choose TPS61088RHLR only for low-voltage, high-current consumer applications where integration outweighs environmental ruggedness. |
Compared with LT8337EDD#PBF and TPS61088RHLR, the LTC3769EUF#PBF offers wider VIN (60V), programmable frequency, phase-lock capability, DCR sensing, and extended temperature range - making it uniquely suitable for demanding industrial and automotive boost converter designs requiring field-proven reliability and design flexibility.
Availability
LTC3769EUF#PBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive ADAS power supplies, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3769EUF#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 its legacy of high-performance analog and power management ICs with rigorous automotive and military-grade qualification.
The LTC3769 belongs to Linear's high-voltage synchronous controller product line, designed specifically for efficient, reliable, and flexible boost conversion in harsh-environment applications including transportation, energy infrastructure, and precision instrumentation.
FAQ
What is the minimum input voltage the LTC3769EUF#PBF can operate from after startup?
The LTC3769EUF#PBF can operate down to 2.3V after startup when VBIAS is powered from the output rail (VOUT) or another auxiliary supply. This ultra-low dropout capability enables seamless operation during battery brownouts or cold-crank events in automotive systems, provided the initial start-up condition meets the 4.5V–60V VBIAS requirement.
How does the ILIM pin configure current limit thresholds on the LTC3769EUF#PBF?
The ILIM pin on the LTC3769EUF#PBF selects one of three peak current sense thresholds: 42mV (ILIM = GND), 75mV (ILIM = floating), or 100mV (ILIM = INTVCC). This logic-level configuration eliminates external resistors and allows precise overcurrent protection tuning matched to the selected sense resistor or inductor DCR value.
Can the LTC3769EUF#PBF synchronize to an external clock, and what is its supported frequency range?
Yes, the LTC3769EUF#PBF supports external synchronization via the PLLIN/MODE pin. When driven with a clean square wave, it locks to frequencies from 75kHz to 850kHz. This feature enables EMI reduction in multi-converter systems and deterministic timing for time-sensitive applications like radar or data acquisition.
What is the purpose of the EXTVCC pin on the LTC3769EUF#PBF, and how should it be used?
The EXTVCC pin on the LTC3769EUF#PBF provides an alternative input to the internal 5.4V LDO that powers gate drivers and control circuitry. When EXTVCC exceeds 4.8V, it disables the VBIAS LDO and sources INTVCC directly - reducing power dissipation and thermal stress in high-input-voltage applications. Leave unconnected or tie to GND if unused.
Does the LTC3769EUF#PBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC3769EUF#PBF supports both methods. Its SENSE+/SENSE– differential inputs accept either a discrete sense resistor or the inductor's DCR voltage drop. The common-mode range (2.3V–60V) and programmable sense thresholds (42/75/100mV) ensure accurate current measurement across the full operating range without additional level-shifting circuitry.
LTC3769EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3769EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3769EUF#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 LTC3769EUF#PBF reliable?
The price and inventory of LTC3769EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3769EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3769EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3769EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3769EUF#PBF?
LTC3769EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3769EUF#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 LTC3769EUF#PBF?
For technical support, including LTC3769EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3769EUF#PBF requirements.
6.How does Aetrix verify that LTC3769EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3769EUF#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 LTC3769EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3769EUF#PBF?
All LTC3769EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3769EUF#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 LTC3769EUF#PBF part is unused and in its original packaging.
Return procedure for LTC3769EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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