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Analog Devices Inc. LTC3769MPUF#PBF
- Part No.:
- LTC3769MPUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3769MPUF#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,941
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Product details
Overview
LTC3769MPUF#PBF from Analog Devices (formerly Linear Technology) is a high-performance, 60V-input synchronous boost controller driving dual N-channel MOSFETs in a constant-frequency current-mode architecture. It supports 4.5V–60V input (down to 2.3V post-startup), delivers up to 60V output, features ±1% 1.200V reference accuracy, 28µA quiescent current, and operates across –55°C to 150°C. It enables high-efficiency 120W 12V-to-24V/5A boost converters for rugged industrial power systems.
For engineers reviewing the LTC3769MPUF#PBF datasheet, LTC3769MPUF#PBF pinout, LTC3769MPUF#PBF application, or LTC3769MPUF#PBF equivalent, key selection criteria include its wide VIN range with sub-2.3V operation capability, programmable 50kHz–900kHz switching frequency, RSENSE/DCR current sensing flexibility, 100% duty cycle support, and thermally enhanced 24-pin 4mm × 4mm QFN package rated for extended temperature operation.
Technical Context
The LTC3769MPUF#PBF implements a peak-current-mode control loop with an error amplifier comparing VFB to a precision 1.200V internal reference, modulating ITH voltage to regulate output. Its dual-gate drivers (TG/BG) support synchronous rectification with programmable dead-time control, minimizing conduction losses in high-power boost stages.
It integrates a phase-lockable oscillator (75kHz–850kHz sync range) and selectable light-load modes-Burst Mode®, pulse-skipping, or forced continuous-via PLLIN/MODE and OVMODE pins. Internal LDOs (INTVCC/EXTVCC) enable flexible biasing: VBIAS-powered or external 4.5V–14V EXTVCC supply, reducing thermal load on the main input path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V (65V abs max); operates down to 2.3V after startup when biased from VOUT - enables battery-backed or wide-range industrial supplies. |
| Output Voltage Range | Up to 60V - supports high-voltage rails for LED drivers, medical imaging, or industrial sensors. |
| Reference Voltage Accuracy | ±1% at 1.200V (–55°C to 150°C) - ensures stable regulation under extreme environmental stress. |
| Quiescent Current | 28µA in no-load operation - extends runtime in always-on battery systems. |
| Switching Frequency Range | Programmable 50kHz to 900kHz (or syncable 75kHz–850kHz) - balances efficiency, EMI, and magnetics size. |
| Current Sensing | RSENSE or inductor DCR - eliminates sense resistor loss in high-current designs. |
| Package | 24-pin 4mm × 4mm QFN with exposed thermal pad - θJA = 47°C/W; requires soldered GND pad for full thermal performance. |
Pinout & Package
Thermally enhanced 24-pin (4mm × 4mm) plastic QFN package with exposed GND pad (Pin 25). All GND pins (Pins 8, 10, 24, 25) must be connected; exposed pad must be soldered to PCB for rated electrical and thermal performance (TJMAX = 150°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (Pin 1) | Main supply input | Accepts 4.5V–60V (65V abs max); powers internal circuits and charge pump - can be tied to VIN or VOUT for low-VIN operation. |
| PGOOD (Pin 2) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from 1.200V for ≥45µs - enables system-level fault monitoring and sequencing. |
| ILIM (Pin 3) | Peak current sense threshold select | Configures current limit to 50mV (GND), 75mV (float), or 100mV (INTVCC) - sets overcurrent protection level without external resistors. |
| INTVCC (Pins 5, 22) | Internal 5.4V LDO output | Supplies gate drivers and control logic; bypassed with ≥4.7µF ceramic capacitor - decoupling critical for noise immunity and stability. |
| FREQ (Pin 7) | Oscillator frequency programming | Resistor-to-GND sets 50kHz–900kHz; DC voltage or sync clock also accepted - enables EMI optimization and multi-phase synchronization. |
| GND (Pins 8, 10, 24, 25) | Signal and thermal ground | Multiple low-inductance paths required; exposed pad (Pin 25) is GND and must be soldered - essential for thermal dissipation and noise reduction. |
| PLLIN/MODE (Pin 9) | Sync input / light-load mode control | Enables external clock sync (75kHz–850kHz) or selects Burst Mode® (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced CCM (INTVCC). |
| RUN (Pin 11) | Enable/shutdown control | 1.28V threshold for soft shutdown; <0.7V for deep shutdown (4µA IQ) - supports precise UVLO and hysteresis via resistor divider from VIN. |
| SS (Pin 12) | Soft-start ramp control | Internal 10µA current charges external capacitor - linearly ramps VOUT from 0V to final value, preventing inrush and overshoot. |
| SENSE– / SENSE+ (Pins 13, 14) | Differential current sense inputs | Support 2.3V–60V common-mode range; tolerate (SENSE+ − SENSE−) up to ±0.3V - compatible with high-side or low-side RSENSE or DCR sensing. |
| VFB (Pin 15) | Feedback input | Compares external resistor-divider output to 1.200V reference - closed-loop regulation point; ±5nA input bias minimizes divider error. |
| ITH (Pin 16) | Error amplifier output / current limit threshold | Directly sets peak inductor current; used for compensation - connects to RC network for loop stability tuning. |
| OVMODE (Pin 17) | Overvoltage response mode select | GND = OV protection (TG forced ON); INTVCC = OV disabled - determines fault behavior and sync-mode light-load operation. |
| SW (Pin 18) | Switch node | Connects to source of synchronous MOSFET, drain of main MOSFET, and inductor - high dv/dt node requiring tight layout and low-inductance routing. |
| TG (Pin 19) | Top gate driver output | Drives gate of synchronous N-MOSFET; integrated charge pump boosts above SW - enables 100% duty cycle and high-side N-FET use. |
| BOOST (Pin 20) | Floating supply for TG driver | Bypassed to SW with ceramic capacitor; 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 controlled dead time - prevents shoot-through in synchronous topology. |
| EXTVCC (Pin 23) | External bias input for INTVCC LDO | Enables 4.5V–14V external supply to power INTVCC, bypassing VBIAS LDO - reduces heat generation in high-input-voltage applications. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET control | Eliminates body-diode conduction loss, enabling >95% efficiency in 120W boost converters and reducing thermal design burden. |
| 100% duty cycle capability | Allows VOUT ≈ VIN during input brownout or hold-up conditions - maintains regulated output even as input drops near output voltage. |
| Multi-mode light-load operation | Burst Mode® (28µA IQ), pulse-skipping, or forced CCM selectable via pins - optimizes efficiency across 100µA–5A load range without firmware. |
| Robust overvoltage protection | Configurable OV response (TG latch-on or normal regulation) via OVMODE pin - prevents damage during feedback fault or open-sense-resistor events. |
| Wide-temperature qualified QFN | –55°C to 150°C operating range with full parameter guarantee - validated for military, aerospace, and downhole industrial deployments. |
Applications
| Industrial Motor Drives | Avionics Power Conversion |
|---|---|
|
Use Scenario: Boosting 24V aircraft bus to 48V for actuator control electronics in fly-by-wire systems. IC Role / Device Role / Timing Role: Primary synchronous boost controller regulating isolated 48V rail with strict EMI and transient response requirements. Use Value: 28µA quiescent current preserves battery life during standby; 75kHz–850kHz sync capability aligns switching with avionics clock domains to suppress conducted emissions. |
Use Scenario: Generating 60V bias for piezoelectric fuel injectors in heavy-duty diesel engines. IC Role / Device Role / Timing Role: High-voltage boost controller delivering precise 60V output from variable 12V–36V battery input under wide ambient temperature swings. Use Value: ±1% 1.200V reference and –55°C to 150°C guaranteed operation ensure injector timing accuracy across engine cold-start to full-load thermal profiles. |
| Medical Imaging Power Supplies | Military Portable Radios |
|
Use Scenario: Providing stable 40V high-current supply for CCD/CMOS sensor bias in portable ultrasound units. IC Role / Device Role / Timing Role: Low-noise, high-efficiency boost controller powering analog front-end circuitry with minimal ripple-induced image artifacts. Use Value: RSENSE/DCR current sensing avoids sense resistor loss and thermal drift; 100% duty cycle maintains output during brief input dips from battery aging or load transients. |
Use Scenario: Enabling 12V-to-28V conversion in handheld tactical radios operating in extreme desert or arctic environments. IC Role / Device Role / Timing Role: Ruggedized boost controller supporting rapid start-up, low-IQ sleep, and reliable operation across –40°C to +85°C ambient with 2.3V minimum VIN. Use Value: 4µA shutdown current extends shelf life; EXTVCC option allows efficient biasing from auxiliary 5V rail, reducing thermal stress on main battery path. |
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 3V–40V VIN range; no EXTVCC or OVMODE pin; 12-pin TSSOP only | Optimized for compact, medium-power (≤30W) DC/DC; lacks extended temp grade and multi-mode light-load control | Select LT8337EFE#PBF only for space-constrained, fixed-frequency designs where 2.3V operation and –55°C rating are unnecessary. |
| TPS40210DGQR | Non-synchronous (external diode); 4.5V–52V VIN; no DCR sensing; 16-pin MSOP; –40°C to 125°C only | Lower cost for ≤60W applications where efficiency <90% is acceptable and thermal headroom exists for diode loss | Choose TPS40210DGQR when synchronous FET drive complexity or extended temperature qualification is not required. |
Compared with LT8337EFE#PBF and TPS40210DGQR, the LTC3769MPUF#PBF uniquely combines –55°C to 150°C guaranteed operation, 2.3V post-startup capability, programmable multi-mode light-load control, and dual-bias (VBIAS/EXTVCC) flexibility - making it the only choice for mission-critical high-reliability boost applications demanding full parameter validation across extreme conditions.
Availability
LTC3769MPUF#PBF is available at Aetrix Electronics and suitable for industrial motor drives, avionics power conversion, and medical imaging systems requiring stable component supply with guaranteed extended-temperature performance and long-term lifecycle continuity.
Supply support for LTC3769MPUF#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and defense markets.
The LTC3769MPUF#PBF belongs to Linear's high-reliability power controller product line, designed specifically for ruggedized DC/DC conversion in harsh-environment applications where extended temperature operation, low quiescent current, and robust fault handling are mandatory.
FAQ
What is the minimum input voltage the LTC3769MPUF#PBF can operate from after startup?
The LTC3769MPUF#PBF can operate from as low as 2.3V after startup when VBIAS is powered from the output (VOUT) or another auxiliary supply. This feature enables hold-up capability during input brownouts and compatibility with deeply discharged batteries. The 4.5V to 60V nominal input range applies when VBIAS is connected directly to VIN.
Does the LTC3769MPUF#PBF support inductor DCR current sensing?
Yes, the LTC3769MPUF#PBF supports both RSENSE and inductor DCR current sensing via its differential SENSE+ and SENSE– inputs. The common-mode voltage range of 2.3V to 60V and tolerance for (SENSE+ − SENSE–) up to ±0.3V make it compatible with low-value DCR traces, eliminating sense resistor power loss and improving efficiency in high-current designs.
How does the EXTVCC pin improve thermal performance in the LTC3769MPUF#PBF?
The EXTVCC pin on the LTC3769MPUF#PBF allows an external 4.5V–14V supply to power the internal 5.4V INTVCC LDO, bypassing the VBIAS-based LDO. This reduces power dissipation in the VBIAS regulator - especially critical at high input voltages - lowering junction temperature and improving reliability in thermally constrained layouts.
What light-load efficiency modes are available on the LTC3769MPUF#PBF?
The LTC3769MPUF#PBF offers three user-selectable light-load modes via the PLLIN/MODE pin: Burst Mode® operation (28µA IQ), pulse-skipping mode, or forced continuous conduction mode. Each mode is configured by simple pin strapping - no microcontroller or configuration registers required - enabling optimal efficiency across the full 100µA to 5A load range.
Is the LTC3769MPUF#PBF pin-compatible with other variants in the LTC3769 family?
Yes, the LTC3769MPUF#PBF shares identical pinout and footprint with all other QFN-packaged LTC3769 variants (e.g., LTC3769EUF#PBF, LTC3769HUF#PBF). The "MP" grade denotes full –55°C to 150°C guaranteed operation and enhanced screening, but electrical functionality and PCB layout are fully interchangeable with standard-grade QFN versions.
LTC3769MPUF#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3769MPUF#PBF FAQ
1.How can I place an order for LTC3769MPUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3769MPUF#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 LTC3769MPUF#PBF reliable?
The price and inventory of LTC3769MPUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3769MPUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3769MPUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3769MPUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3769MPUF#PBF?
LTC3769MPUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3769MPUF#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 LTC3769MPUF#PBF?
For technical support, including LTC3769MPUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3769MPUF#PBF requirements.
6.How does Aetrix verify that LTC3769MPUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3769MPUF#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 LTC3769MPUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3769MPUF#PBF?
All LTC3769MPUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3769MPUF#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 LTC3769MPUF#PBF part is unused and in its original packaging.
Return procedure for LTC3769MPUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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