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Analog Devices Inc. LTC3769IUF#PBF
- Part No.:
- LTC3769IUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3769IUF#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:363
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Product details
Overview
LTC3769IUF#PBF from Analog Devices (formerly Linear Technology) is a high-performance synchronous boost controller driving all-N-channel MOSFET stages for industrial and automotive DC-DC conversion. It supports 4.5V–60V input, delivers up to 60V output, features ±1% 1.200V reference accuracy, 28μA no-load quiescent current, and operates down to 2.3V after start-up when biased from VOUT.
For engineers reviewing the LTC3769IUF#PBF datasheet, LTC3769IUF#PBF pinout, LTC3769IUF#PBF application, or LTC3769IUF#PBF equivalent, key selection criteria include wide VIN range with ultra-low IQ, programmable 50kHz–900kHz switching frequency, RSENSE/DCR current sensing flexibility, 100% duty cycle capability, and thermally enhanced 4mm × 4mm QFN package with exposed ground pad.
Technical Context
The LTC3769IUF#PBF implements constant-frequency current-mode control with dual gate drivers (TG/BG), internal 5.4V LDO (INTVCC), and selectable light-load operation-Burst Mode®, pulse-skipping, or forced continuous conduction-via PLLIN/MODE pin logic. Its error amplifier compares VFB against a precision 1.200V reference to regulate ITH and thus peak inductor current.
It integrates phase-lockable oscillator (75kHz–850kHz sync range), power-good monitoring with ±10% trip threshold and 45μs delay, overvoltage protection configurable via OVMODE, and dual power inputs (VBIAS and EXTVCC) enabling efficient biasing from output or auxiliary rail. The controller supports both sense-resistor and DCR-based current sensing with three programmable VSENSE(MAX) thresholds (42/68/90mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V (65V abs max); operates down to 2.3V after start-up when VBIAS supplied from VOUT - enables battery-backed or wide-input industrial systems. |
| Output Voltage Range | Up to 60V regulated - supports high-voltage LED strings, industrial sensors, and isolated bias supplies. |
| Reference Voltage Accuracy | ±1% at 1.200V (1.188V–1.212V) - ensures tight output regulation across temperature and load. |
| Quiescent Current | 28μA in no-load operation - extends runtime in always-on battery-powered applications like telematics or remote sensors. |
| Switching Frequency Range | Programmable 50kHz–900kHz or syncable 75kHz–850kHz - balances efficiency, size, and EMI in space-constrained designs. |
| Current Sense Thresholds | Selectable 42mV / 68mV / 90mV via ILIM pin - optimizes sensing resolution and loss trade-off for RSENSE or DCR implementations. |
| Package | 24-pin 4mm × 4mm QFN with exposed thermal pad - provides low θJA = 47°C/W and robust thermal performance for 120W+ boost stages. |
Pinout & Package
Package: 24-Lead (4mm × 4mm) Plastic QFN with exposed GND pad (Pin 25). Requires soldering of exposed pad to PCB for rated thermal and electrical performance (θJA = 47°C/W, TJMAX = 150°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (Pin 1) | Main supply input | Bias source for internal LDO; accepts 4.5V–60V; enables operation down to 2.3V post-start-up if tied to VOUT. |
| 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 | Ground/float/INTVCC sets VSENSE(MAX) to 50/75/100mV - configures peak current sensing gain without external resistors. |
| INTVCC (Pins 5, 22) | Internal 5.4V LDO output | Supplies gate drivers and control circuitry; requires ≥4.7μF ceramic bypass to GND; switchover to EXTVCC occurs at ~4.8V. |
| FREQ (Pin 7) | Oscillator frequency control | Resistor-to-GND or DC voltage sets 50kHz–900kHz; GND/INTVCC forces fixed 350kHz/535kHz - enables EMI tuning and layout optimization. |
| GND (Pins 8, 10, 24, Exposed Pad 25) | Signal and power ground | All pins must be connected; exposed pad is mandatory GND connection - ensures stable reference, low noise, and thermal dissipation. |
| PLLIN/MODE (Pin 9) | Sync input / light-load mode select | Accepts external clock (75kHz–850kHz) or selects Burst Mode®/pulse-skipping/forced CCM - critical for efficiency vs. ripple trade-offs. |
| RUN (Pin 11) | Enable/shutdown control | 1.28V threshold for soft shutdown; <0.7V for deep sleep (4μA IQ) - supports controlled power sequencing and low-power standby. |
| SS (Pin 12) | Soft-start ramp generator | 10μA internal current charges external capacitor - linearly ramps VOUT during startup to limit inrush and stress on components. |
| SENSE– / SENSE+ (Pins 13, 14) | Differential current sense inputs | Accept common-mode voltage 2.3V–60V; support RSENSE or DCR sensing - enables accurate current limiting across wide VIN/VOUT ranges. |
| VFB (Pin 15) | Error amplifier feedback input | Compares resistive divider output against 1.200V reference - closed-loop regulation point for output voltage accuracy and stability. |
| ITH (Pin 16) | Error amp output / current limit threshold | Voltage sets peak inductor current; also used for loop compensation - direct interface between regulation and power stage control. |
| OVMODE (Pin 17) | Overvoltage protection mode select | GND enables OV latch-off (TG forced on); INTVCC disables OV protection - allows safe operation in systems with external OV supervision. |
| SW (Pin 18) | Switch node | Connects to source of synchronous FET, drain of main FET, and inductor - high dv/dt node requiring careful layout and snubbing. |
| TG (Pin 19) | Top gate driver output | Drives gate of synchronous N-MOSFET; supports 100% duty cycle - enables high-efficiency boost with minimal dropout. |
| BOOST (Pin 20) | Floating supply for TG driver | Bypassed to SW with ceramic cap; powered via Schottky from INTVCC - sustains gate drive during high-duty-cycle operation. |
| BG (Pin 21) | Bottom gate driver output | Drives gate of main N-MOSFET; complements TG timing with dead-time control - ensures shoot-through prevention. |
| EXTVCC (Pin 23) | External bias input for INTVCC LDO | Enables switchover from VBIAS LDO when >4.8V - reduces power loss and heat in high-VIN applications. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET control | Eliminates body-diode conduction loss, enabling >95% efficiency in 12V→24V/5A (120W) applications and reducing thermal design burden. |
| Ultra-low 28μA quiescent current | Extends battery life in always-on systems (e.g., automotive infotainment backup, IoT edge nodes) without sacrificing start-up capability. |
| 100% duty cycle capability | Permits VOUT ≈ VIN operation - essential for "pass-through" modes in automotive cold-crank scenarios or seamless input transitions. |
| Three light-load operating modes | Burst Mode® (28μA IQ), pulse-skipping, or forced CCM - lets designers optimize for efficiency, output ripple, or EMI in variable-load systems. |
| Programmable current-sense thresholds | 42/68/90mV options via ILIM pin - preserves accuracy while minimizing I²R loss across RSENSE values from 2mΩ to 20mΩ. |
| Robust thermal QFN package | 4mm × 4mm footprint with exposed GND pad delivers θJA = 47°C/W - supports compact, high-power-density layouts without heatsinks. |
Applications
| Automotive ADAS Power Supply | Industrial 24V Bus Booster |
|---|---|
|
Use Scenario: Powering radar modules and camera sensors from 9V–16V automotive battery during cold-crank (down to 2.3V). IC Role / Device Role / Timing Role: Synchronous boost controller regulating 24V output with 100% duty cycle pass-through and Burst Mode® for standby IQ. Use Value: Maintains sensor operation below 6V input; 28μA IQ extends battery hold-up time; ±1% VREF ensures stable ADC reference for precision imaging. |
Use Scenario: Stepping up factory floor 12V DC bus to 24V for PLC I/O modules and field transmitters. IC Role / Device Role / Timing Role: High-efficiency boost controller with RSENSE current sensing and programmable 350kHz–535kHz switching for EMI compliance. Use Value: Delivers 120W at >94% efficiency; 4.5V–60V input accommodates brownouts and surges; EXTVCC option reduces thermal load on VBIAS path. |
| Medical Portable Imaging Battery Pack | Military UAV Payload Power |
|
Use Scenario: Generating 48V bias for portable X-ray detector arrays from Li-ion battery (3.0V–4.2V/cell). IC Role / Device Role / Timing Role: Wide-VIN synchronous boost controller with soft-start (SS pin) and PGOOD sequencing for safety-critical startup. Use Value: 2.3V start-up enables full discharge utilization; ±1% VREF ensures consistent detector gain calibration; QFN package fits compact battery-integrated PCBs. |
Use Scenario: Providing 28V avionics rail from 12V UAV battery under vibration, temperature extremes (–40°C to 125°C). IC Role / Device Role / Timing Role: MIL-grade boost controller (LTC3769IUF#PBF rated –40°C to 125°C) with phase-lockable frequency for synchronized multi-rail converters. Use Value: Guaranteed operation across military temp range; 75kHz–850kHz sync eliminates beat frequencies; exposed-pad QFN ensures reliability under thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8337EFE#PBF | Fixed 2MHz frequency, lower VIN min (3V), no EXTVCC or PLL sync; 20-pin TSSOP only. | Better for compact, high-frequency, low-power (<30W) apps; lacks 100% duty cycle and wide-VIN flexibility. | Choose LT8337EFE#PBF for space-constrained, cost-sensitive designs where 2MHz switching and 3V start-up outweigh need for programmability and thermal headroom. |
| TPS40210DGQ | Non-synchronous (external diode), higher IQ (1.5mA), no Burst Mode®, 4.5V–52V VIN, SOIC-8. | Lower BOM cost but reduced efficiency at high current; unsuitable for >5A or battery-life-critical use. | Choose TPS40210DGQ only for legacy designs or low-cost industrial supplies where 2–3% efficiency loss and higher thermal load are acceptable. |
Compared with LT8337EFE#PBF and TPS40210DGQ, the LTC3769IUF#PBF uniquely combines ultra-low IQ, 100% duty cycle, wide-VIN operation, and programmable frequency in a thermally optimized QFN - making it the sole choice for high-reliability, high-efficiency, wide-input boost applications demanding long battery life and robust thermal performance.
Availability
LTC3769IUF#PBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial 24V bus boosters, and medical portable imaging battery packs requiring stable component supply, extended temperature support (–40°C to 125°C), and long-term production continuity.
Supply support for LTC3769IUF#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 high-performance analog and power management portfolio with rigorous qualification and long-term support.
The LTC3769IUF#PBF belongs to Linear's high-efficiency synchronous controller product line, designed specifically for demanding industrial, automotive, and medical DC-DC conversion where wide input range, ultra-low quiescent current, and thermal resilience are critical.
FAQ
What is the minimum input voltage for LTC3769IUF#PBF after startup?
The LTC3769IUF#PBF can operate down to 2.3V after startup when VBIAS is powered from the output (VOUT) or another auxiliary supply - a key feature enabling reliable operation during automotive cold-crank events or deep battery discharge. This is distinct from its 4.5V minimum startup voltage when VBIAS is tied directly to VIN.
Does LTC3769IUF#PBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC3769IUF#PBF supports both methods: differential sensing across an external resistor (RSENSE) or across the inductor's DCR using the SENSE+ and SENSE– pins. Its wide common-mode input range (2.3V–60V) and programmable VSENSE(MAX) thresholds (42/68/90mV via ILIM pin) ensure accurate current measurement regardless of sensing method.
How does the EXTVCC pin improve efficiency in LTC3769IUF#PBF designs?
The EXTVCC pin allows the LTC3769IUF#PBF to derive INTVCC power from an external 4.8V–14V supply instead of the VBIAS LDO, bypassing up to ~500mW of power dissipation in high-VIN applications. This reduces thermal stress and improves overall system efficiency - especially valuable in 48V industrial or automotive systems where VBIAS would otherwise drop significantly.
What are the three light-load operating modes of LTC3769IUF#PBF and how are they selected?
The LTC3769IUF#PBF offers Burst Mode® (28μA IQ), pulse-skipping, and forced continuous conduction - selected via the PLLIN/MODE pin: grounded for Burst Mode®, tied to INTVCC for forced CCM, or biased to 1.2V–(INTVCC–1.3V) for pulse-skipping. Each mode optimizes the trade-off between light-load efficiency, output ripple, and EMI profile.
Is the LTC3769IUF#PBF pin-compatible with other variants in the LTC3769 family?
Yes, the LTC3769IUF#PBF shares identical pinout and footprint with all 24-pin QFN variants (e.g., LTC3769EUF#PBF, LTC3769HUF#PBF), differing only in temperature grade and screening. This enables drop-in replacement across commercial, industrial, high-reliability, and extended-temperature versions without PCB redesign.
LTC3769IUF#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)
LTC3769IUF#PBF FAQ
1.How can I place an order for LTC3769IUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3769IUF#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 LTC3769IUF#PBF reliable?
The price and inventory of LTC3769IUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3769IUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3769IUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3769IUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3769IUF#PBF?
LTC3769IUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3769IUF#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 LTC3769IUF#PBF?
For technical support, including LTC3769IUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3769IUF#PBF requirements.
6.How does Aetrix verify that LTC3769IUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3769IUF#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 LTC3769IUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3769IUF#PBF?
All LTC3769IUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3769IUF#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 LTC3769IUF#PBF part is unused and in its original packaging.
Return procedure for LTC3769IUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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