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Analog Devices Inc. LTC3769MPFE#TRPBF
- Part No.:
- LTC3769MPFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3769MPFE#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,422
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Product details
Overview
LTC3769MPFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance, 60V-input synchronous boost controller driving all-N-channel MOSFET stages. It delivers ±1% output voltage regulation up to 60V, supports input operation down to 2.3V after startup, and achieves 28μA quiescent current for battery-powered industrial and automotive systems requiring high efficiency and low heat dissipation.
For engineers reviewing the LTC3769MPFE#TRPBF datasheet, LTC3769MPFE#TRPBF pinout, LTC3769MPFE#TRPBF application, or LTC3769MPFE#TRPBF equivalent, key selection criteria include its wide 4.5V–60V input range, programmable 50kHz–900kHz switching frequency, RSENSE/DCR current sensing, 100% duty cycle capability, and –55°C to 150°C extended temperature grade in TSSOP-20 package.
Technical Context
The LTC3769MPFE#TRPBF implements constant-frequency current-mode control with an internal error amplifier, transconductance EA, and dual gate drivers optimized for synchronous N-MOSFET operation. Its architecture includes independent top-gate (TG) and bottom-gate (BG) drivers with 20ns rise/fall times and 30ns dead-time control, supporting high-efficiency boost conversion without external bootstrap components.
It integrates a phase-lockable PLL for synchronization (75kHz–850kHz), selectable light-load modes (Burst Mode®, pulse-skipping, forced continuous), and dual power sources-VBIAS LDO (4.5V–60V) and EXTVCC switchover (4.5V–14V)-to minimize power loss in high-voltage industrial and military applications.
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 cold-cranking support in automotive and brownout resilience in industrial systems. |
| Output Voltage Range | Up to 60V regulated; set via external resistor divider on VFB - supports high-voltage LED drivers, medical imaging supplies, and industrial sensors. |
| Feedback Reference | ±1% 1.200V reference over –55°C to 150°C - ensures stable output regulation across extreme environmental conditions. |
| Quiescent Current | 28μA in no-load pulse-skipping mode - extends battery runtime in portable test equipment and remote monitoring devices. |
| Switching Frequency | Programmable 50kHz to 900kHz via FREQ pin resistor or synchronized externally (75kHz–850kHz) - allows EMI optimization and inductor size reduction in space-constrained designs. |
| Current Sensing | RSENSE or inductor DCR sensing with three selectable thresholds (42mV/68mV/90mV via ILIM pin) - enables flexible, accurate peak-current limiting across diverse power levels. |
| Shutdown Current | 4μA at RUN < 0.7V - meets ultra-low-power requirements for always-on subsystems in avionics and defense electronics. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE), exposed pad (Pin 21) soldered to PCB for thermal and electrical grounding. θJA = 38°C/W. Operating junction temperature range: –55°C to 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (Pin 1) | Main supply input | Accepts 4.5V–60V; powers internal LDO and logic - connects to VIN or VOUT for self-biasing in high-efficiency boost configurations. |
| PGOOD (Pin 2) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from 1.2V for ≥45μs - provides system-level fault signaling for safety-critical industrial controllers. |
| ILIM (Pin 3) | Peak current sense threshold select | Ground/float/INTVCC sets 50mV/75mV/100mV current limit - enables precise overcurrent protection tuning without external resistors. |
| GND (Pins 4, 21) | Signal and thermal ground | Multiple GND pins + exposed pad must be connected to solid ground plane - ensures stable current sensing and thermal performance at full load. |
| PLLIN/MODE (Pin 5) | Light-load mode & sync input | Ground = Burst Mode®; INTVCC = forced continuous; 1.2V–(INTVCC−1.3V) = pulse-skipping - selects efficiency-optimized operation per load condition. |
| RUN (Pin 6) | Enable/shutdown control | 1.28V threshold with 100mV hysteresis; <0.7V enables 4μA shutdown - supports sequenced power-up and system-level enable logic. |
| SS (Pin 7) | Soft-start ramp control | Internal 10μA pull-up charges external capacitor - controls VOUT slew rate to prevent inrush current in motor drive and lighting applications. |
| SENSE– (Pin 8) | Negative current sense input | Common-mode range: 2.3V–60V - connects to low-side of sense resistor or inductor DCR network for accurate current measurement. |
| SENSE+ (Pin 9) | Positive current sense input | Supplies bias to current comparator; common-mode range matches SENSE– - enables high-side or low-side sensing with minimal offset. |
| VFB (Pin 10) | Error amplifier feedback input | Compares divided VOUT against 1.200V reference - determines output regulation accuracy and loop stability via external resistor divider. |
| ITH (Pin 11) | Error amplifier output & current limit threshold | Voltage sets peak inductor current; EA output drives ITH - forms inner current loop and outer voltage loop interface point. |
| OVMODE (Pin 12) | Overvoltage protection mode select | Ground = OV latch-off with TG forced on; INTVCC = OV disabled - configures fail-safe behavior during feedback fault conditions. |
| SW (Pin 13) | Switch node connection | Connects to source of synchronous MOSFET and drain of main MOSFET - high dv/dt node requiring tight layout and Kelvin routing. |
| TG (Pin 14) | Top gate driver output | Drives gate of synchronous N-MOSFET; 1.2Ω pull-up/pull-down - eliminates need for external bootstrap diode/capacitor in high-side drive. |
| BOOST (Pin 15) | Floating supply for TG driver | Bypassed to SW with ceramic capacitor; charged via Schottky from INTVCC - sustains gate drive during 100% duty cycle operation. |
| BG (Pin 16) | 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 18) | External bias input for INTVCC LDO | Enables switchover from VBIAS LDO when >4.8V - reduces power loss and thermal stress in high-input-voltage applications. |
| INTVCC (Pins 2, 17) | Internal 5.4V LDO output | Powers gate drivers and control logic; requires ≥4.7μF ceramic bypass - critical for stable gate drive and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle capability | Enables VOUT ≥ VIN operation without dropout - essential for battery backup systems where input may dip below required output. |
| Phase-lockable oscillator (75–850kHz) | Allows synchronization to system clock or other converters - reduces beat frequencies and EMI in multi-rail industrial power supplies. |
| Three selectable light-load modes | Burst Mode®, pulse-skipping, and forced continuous - maximizes efficiency across 0.1mA–5A load range without manual reconfiguration. |
| Integrated EXTVCC switchover | Automatically switches INTVCC source from VBIAS to external supply above 4.8V - cuts LDO power loss by >60% in 48V input systems. |
| ±1% reference over full temperature range | Maintains output accuracy without calibration - satisfies MIL-STD-704 and DO-160 compliance for aerospace and defense platforms. |
| Low 28μA quiescent current | Extends standby time in battery-operated instrumentation - enables >1-year operation on a single CR123A cell in wireless sensor nodes. |
Applications
| Industrial Motor Drives | Automotive ADAS Power Supplies |
|---|---|
Use Scenario: Boosting 12V vehicle battery to 24V/48V for radar modules and camera ISPs in autonomous driving systems. IC Role / Device Role / Timing Role: Synchronous boost controller managing high-efficiency DC-DC conversion with precise current limiting and thermal robustness. Use Value: Delivers 120W output with >94% efficiency at 5A, enabling compact heatsink-free design while meeting AEC-Q100 Grade 1 requirements via –40°C to 125°C qualification. | Use Scenario: Generating stable 15V rail from 9V–16V automotive battery for LiDAR laser drivers and high-speed SerDes interfaces. IC Role / Device Role / Timing Role: High-voltage boost controller with cold-crank operation (2.3V start-up) and programmable frequency for EMI filtering. Use Value: Maintains regulation during engine cranking events and supports spread-spectrum frequency modulation to pass CISPR 25 Class 5 emissions testing. |
| Medical Imaging Power Modules | Military Portable Radios |
Use Scenario: Providing isolated 60V bias for X-ray detector arrays and ultrasound transducer pulsers in handheld diagnostic devices. IC Role / Device Role / Timing Role: Precision-regulated boost controller with ±1% reference and low-noise gate drive for analog-sensitive front-end circuits. Use Value: Achieves <10mVpp output ripple and <0.1% load regulation - preserves signal integrity in low-light imaging and high-resolution ultrasound beamforming. | Use Scenario: Converting 24V nominal battery to 28V/30V for RF power amplifiers in manpack radios operating in extreme desert or arctic environments. IC Role / Device Role / Timing Role: Extended-temperature boost controller with –55°C to 150°C rating and 4μA shutdown current for long-term field deployment. Use Value: Ensures reliable start-up at –55°C and sustained operation at 150°C junction temperature - certified to MIL-STD-810H thermal shock and vibration profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3769EFE#TRPBF | Same silicon, rated for –40°C to 125°C (vs. –55°C to 150°C); lower cost; identical pinout and electrical specs. | Suitable for commercial/industrial applications without extended temperature or military qualification needs. | Select when operating ambient stays above –40°C and lifecycle qualification to MIL-PRF-38534 is not required. |
| LTC3769HFE#TRPBF | Same silicon, rated for –40°C to 150°C; higher max junction temperature than MP grade but lacks –55°C low-temp validation. | Applicable in under-hood automotive and high-ambient industrial enclosures where sub-zero startup is not needed. | Choose for cost-sensitive high-temp applications where –55°C cold-start is unnecessary and qualification to MIL-STD-883 is not mandated. |
Compared with LTC3769MPFE#TRPBF, the EFE variant offers lower acquisition cost for standard-temperature use, while the HFE variant provides higher thermal margin than EFE but lacks the full military-grade low-temperature validation - making the MP grade uniquely suited for deployed defense electronics requiring guaranteed operation across the widest possible environmental envelope.
Availability
LTC3769MPFE#TRPBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive ADAS power supplies, and military portable radios requiring stable component supply with guaranteed extended-temperature performance and long-term obsolescence management.
Supply support for LTC3769MPFE#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 and maintains full product support, datasheets, and application engineering for the LTC portfolio.
The LTC3769 belongs to Linear's high-voltage DC-DC controller family, designed specifically for ruggedized, high-efficiency boost conversion in aerospace, defense, and industrial systems demanding extended temperature operation and low quiescent current.
FAQ
What is the minimum input voltage for LTC3769MPFE#TRPBF after startup?
The LTC3769MPFE#TRPBF can operate with input voltage as low as 2.3V after startup when VBIAS is powered from the output rail (VOUT). This enables reliable operation during automotive cold-crank events and brownout conditions in industrial PLCs. Startup itself requires ≥4.5V on VBIAS, but once running, the controller sustains regulation down to 2.3V - a key differentiator for mission-critical systems where input voltage sag must not cause reset or dropout. The LTC3769MPFE#TRPBF achieves this via internal charge pump and bias management circuitry.
How does the ILIM pin configure current limit thresholds on LTC3769MPFE#TRPBF?
The ILIM pin on LTC3769MPFE#TRPBF selects one of three fixed peak current sense thresholds: grounding sets 50mV, floating sets 75mV, and connecting to INTVCC sets 100mV. These correspond directly to the maximum allowable voltage across the sense resistor (RSENSE) or DCR network. This hardware-selectable configuration eliminates the need for precision external resistors or DACs, simplifying design and improving reliability in harsh environments. All three thresholds are fully characterized across the –55°C to 150°C range for the LTC3769MPFE#TRPBF.
Can LTC3769MPFE#TRPBF synchronize to an external clock, and what is the supported frequency range?
Yes, LTC3769MPFE#TRPBF supports external synchronization via the PLLIN/MODE pin, locking its switching frequency to an external clock within 75kHz to 850kHz. The internal PLL ensures phase alignment between the rising edge of BG and the external clock, reducing beat frequencies and EMI in multi-converter systems. This capability is fully functional across the entire –55°C to 150°C operating range and is validated in the LTC3769MPFE#TRPBF datasheet's Electrical Characteristics table under "Synchronizable Frequency".
What is the purpose of the OVMODE pin on LTC3769MPFE#TRPBF, and how does it affect overvoltage protection?
The OVMODE pin on LTC3769MPFE#TRPBF determines overvoltage response: grounding enables active protection (TG forced on until VFB returns within ±10%), while tying to INTVCC disables OV latching and allows normal PWM operation during overvoltage. This dual-mode flexibility supports both fail-safe systems (e.g., avionics) and fault-tolerant architectures (e.g., redundant power supplies). The LTC3769MPFE#TRPBF's OVMODE function is internally pulled down, ensuring default safe behavior when unconnected.
Does LTC3769MPFE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, LTC3769MPFE#TRPBF supports true 100% duty cycle operation - meaning the bottom MOSFET can remain continuously on, allowing VOUT to equal or exceed VIN without dropout. This is achieved through independent TG/BG gate drivers and BOOST charge pump architecture that sustains top-gate drive even when SW ≈ VOUT. It is essential for battery backup systems and hold-up supplies where input voltage may fall below required output. The LTC3769MPFE#TRPBF datasheet confirms this capability in the "Features" section and "Typical Application" schematic.
LTC3769MPFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3769MPFE#TRPBF FAQ
1.How can I place an order for LTC3769MPFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3769MPFE#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 LTC3769MPFE#TRPBF reliable?
The price and inventory of LTC3769MPFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3769MPFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3769MPFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3769MPFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3769MPFE#TRPBF?
LTC3769MPFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3769MPFE#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 LTC3769MPFE#TRPBF?
For technical support, including LTC3769MPFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3769MPFE#TRPBF requirements.
6.How does Aetrix verify that LTC3769MPFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3769MPFE#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 LTC3769MPFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3769MPFE#TRPBF?
All LTC3769MPFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3769MPFE#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 LTC3769MPFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3769MPFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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