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Analog Devices Inc. LTC3769IUF#TRPBF
- Part No.:
- LTC3769IUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3769IUF#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,910
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Product details
Overview
LTC3769IUF#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance, 4.5V–60V input synchronous boost controller driving all-N-channel MOSFETs. It delivers up to 60V output, features ±1% 1.200V reference accuracy, 28μA no-load quiescent current, and supports RSENSE or DCR current sensing for precision regulation in high-efficiency DC/DC conversion stages.
For engineers reviewing the LTC3769IUF#TRPBF datasheet, LTC3769IUF#TRPBF pinout, LTC3769IUF#TRPBF application, or LTC3769IUF#TRPBF equivalent, key selection criteria include wide VIN range (down to 2.3V post-startup), programmable 50kHz–900kHz switching frequency, phase-lockable PLL interface, 100% duty cycle capability, and thermally enhanced 4mm × 4mm QFN-24 package with exposed GND pad.
Technical Context
The LTC3769IUF#TRPBF 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-via the PLLIN/MODE pin. Its error amplifier compares VFB against a stable 1.200V reference, while ITH sets peak current limit dynamically.
It supports flexible power sourcing: INTVCC can be supplied from VBIAS (4.5V–60V) or EXTVCC (4.5V–14V), enabling efficiency optimization in battery- and bus-powered systems. Overvoltage protection (OVMODE-selectable), Power Good monitoring (PGOOD), and soft-start (SS) with 10μA pull-up current provide robust system-level control.
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 and wide-battery-chemistry support. |
| Output Voltage Range | Up to 60V - suitable for industrial LED drivers, medical HV supplies, and automotive 48V boost stages. |
| Reference Voltage Accuracy | ±1% at 1.200V - ensures tight output regulation across temperature and line/load conditions. |
| Quiescent Current | 28μA in no-load operation - extends runtime in always-on battery systems like telematics or portable diagnostics. |
| Switching Frequency Range | 50kHz to 900kHz (programmable); 75kHz to 850kHz (PLL-synchronized) - balances EMI, size, and efficiency in space-constrained designs. |
| Current Sense Options | RSENSE or inductor DCR sensing - eliminates sense resistor losses and improves thermal performance in high-current applications. |
| Package | 24-pin 4mm × 4mm QFN with exposed thermal pad - θJA = 47°C/W; requires soldered GND pad for rated thermal and electrical 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 to PCB ground plane; exposed pad must be soldered for thermal integrity and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (Pin 1) | Main supply input | Accepts 4.5V–60V; powers internal circuitry and charge pump - can be tied to VIN or VOUT for low-input operation post-startup. |
| PGOOD (Pin 2) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from 1.200V for ≥45μs - enables system sequencing and fault detection. |
| ILIM (Pin 3) | Peak current sense threshold select | Connect to GND/FLOAT/INTVCC to set max sense voltage to 50/75/100mV - configures current limit without external resistors. |
| INTVCC (Pins 5, 22) | Internal 5.4V LDO output | Supplies gate drivers and control logic; requires ≥4.7μF ceramic capacitor to GND - decoupling critical for stability. |
| FREQ (Pin 7) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; DC voltage or sync clock enables precise frequency tuning or PLL locking. |
| GND (Pins 8, 10, 24, 25) | Signal and thermal ground | Multiple low-inductance paths required; exposed pad (Pin 25) must be soldered to PCB ground plane for thermal dissipation. |
| PLLIN/MODE (Pin 9) | Sync input / light-load mode selector | Accepts external clock for phase-locking; 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 partial shutdown; <0.7V for full shutdown (4μA IQ) - supports undervoltage lockout via resistor divider from VIN. |
| SS (Pin 12) | Soft-start ramp control | 10μA internal current charges external capacitor - linearly ramps VOUT during startup to limit inrush and stress. |
| SENSE+ / SENSE− (Pins 14, 13) | Differential current sense inputs | Support 2.3V–60V common-mode range; enable accurate current sensing with RSENSE or DCR - critical for overcurrent protection. |
| VFB (Pin 15) | Error amplifier feedback input | Compares remote output voltage (via resistor divider) to 1.200V reference - determines regulation accuracy and loop stability. |
| ITH (Pin 16) | Error amplifier output / current limit threshold | Directly sets peak inductor current; voltage range 0.425V–2V defines operating mode and load response dynamics. |
| OVMODE (Pin 17) | Overvoltage protection mode select | GND = OVP enabled (TG forced on); INTVCC = OVP disabled - also selects light-load behavior during PLL sync. |
| SW (Pin 18) | Switch node connection | Connects to source of synchronous MOSFET and drain of main MOSFET - high dv/dt node requiring careful layout and grounding. |
| TG (Pin 19) | Top gate driver output | Drives gate of synchronous N-MOSFET; uses BOOST rail for high-side level shifting - enables 100% duty cycle operation. |
| BOOST (Pin 20) | Floating supply for TG driver | Bypassed to SW with ceramic capacitor; charged via Schottky diode from INTVCC - sustains gate drive during high-duty cycles. |
| BG (Pin 21) | Bottom gate driver output | Drives gate of main N-MOSFET; referenced to GND - optimized for fast rise/fall times (20ns typ) and low shoot-through risk. |
| EXTVCC (Pin 23) | External bias input for INTVCC LDO | Enables bypass of VBIAS LDO when >4.8V applied - reduces power loss and heat in high-input-voltage applications. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET control | Eliminates external Schottky diode losses, increasing efficiency by 3–8% and reducing thermal load in 12V→24V/5A+ converters. |
| 100% duty cycle capability | Enables VOUT ≈ VIN operation - essential for automotive cold-crank scenarios where input may dip below regulated output. |
| Programmable light-load modes | Burst Mode® (28μA IQ), pulse-skipping, or forced CCM selected via single pin - optimizes efficiency across 100μA–5A load range. |
| Robust overvoltage protection | OVMODE-selectable response (TG latch-on or normal regulation) prevents damage during feedback loop faults or open-sense-resistor events. |
| Flexible power architecture | Dual LDO inputs (VBIAS and EXTVCC) allow optimal bias sourcing - e.g., EXTVCC from intermediate rail cuts VBIAS dissipation by >50% at 48V input. |
Applications
| Automotive 48V Mild Hybrid Boost | Industrial LED Driver Supply |
|---|---|
Use Scenario: Boosting 12V vehicle battery to stable 48V rail for electric turbochargers and ADAS sensors during engine start-stop cycles. IC Role / Device Role / Timing Role: Primary synchronous boost controller regulating 48V output with 2.3V minimum VIN operation and 100% duty cycle fallback. Use Value: Maintains system uptime during cold cranking (VIN < 6V); 28μA quiescent current preserves battery during extended parking. |
Use Scenario: Driving high-power white LED strings (e.g., 36V, 1.5A) from 24V industrial bus with strict dimming ripple requirements. IC Role / Device Role / Timing Role: Constant-current boost controller using VFB/ITH loop with programmable 500kHz switching to minimize EMI near sensitive analog circuits. Use Value: ±1% reference and RSENSE/DCR sensing ensure <±2% LED current accuracy; PGOOD enables real-time health monitoring. |
| Portable Medical Imaging HV Supply | Telecom Remote Radio Unit (RRU) Bias |
Use Scenario: Generating isolated 60V bias for CMOS image sensor biasing in handheld ultrasound devices powered by single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: High-efficiency boost controller operating from VOUT-derived VBIAS after startup, enabling ultra-low-noise HV generation. Use Value: 60V output capability and 28μA IQ extend battery life; soft-start (SS) prevents transducer voltage overshoot during power-on. |
Use Scenario: Providing 28V/3A bias to GaN power amplifiers in outdoor 5G RRUs powered from -48V telecom rectifier with wide ambient temperature swing (-40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade boost controller (LTC3769IUF#TRPBF) delivering stable 28V with phase-lockable frequency to synchronize switching noise away from RF bands. Use Value: Guaranteed -40°C to +125°C operation; PLLIN synchronization reduces conducted EMI; PGOOD confirms rail readiness before PA enable. |
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 | Wider 3V–40V input; integrated 2.5A switch; fixed 2MHz frequency; no PLL sync or DCR sensing. | Targeted at lower-power (<15W), space-constrained apps; lacks programmable light-load modes and high-VIN capability. | Select when board area is critical and 40V max VIN suffices; avoid for >40V input or precision current sensing. |
| TPS61088RHLR | Integrated 10A switch; 2.7V–12V input; fixed 500kHz/1MHz; no OVMODE or EXTVCC option; lower IQ (300μA). | Optimized for USB PD and portable consumer power banks; not rated for industrial temp or >12V input. | Choose for cost-sensitive, low-VIN consumer apps; unsuitable for automotive, medical, or 48V+ systems. |
Compared with LT8337EFE#PBF and TPS61088RHLR, the LTC3769IUF#TRPBF uniquely combines 60V input, 60V output, 28μA IQ, PLL synchronization, and DCR/RSENSE flexibility - making it the only option for high-reliability, wide-input industrial and automotive boost stages requiring long-term stability and thermal resilience.
Availability
LTC3769IUF#TRPBF is available at Aetrix Electronics and suitable for automotive 48V mild hybrid systems, industrial LED drivers, portable medical imaging supplies, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3769IUF#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 its high-performance analog IC portfolio, emphasizing precision, reliability, and ruggedized design for demanding industrial, automotive, and medical applications.
The LTC3769IUF#TRPBF belongs to Linear's synchronous controller product line, engineered specifically for high-efficiency, wide-input-voltage boost conversion in safety-critical and thermally constrained environments.
FAQ
What is the minimum input voltage for LTC3769IUF#TRPBF after startup?
The LTC3769IUF#TRPBF can operate down to 2.3V after startup when VBIAS is powered from the output rail (VOUT) rather than the input (VIN). This enables continued regulation during severe input dips - such as automotive cold-cranking events - provided VOUT remains above 2.3V and sufficient hold-up capacitance is used. The absolute minimum VIN before startup remains 4.5V.
Does LTC3769IUF#TRPBF support inductor DCR current sensing?
Yes, the LTC3769IUF#TRPBF fully supports inductor DCR current sensing via its differential SENSE+ and SENSE− pins. It includes built-in filtering and offset compensation to reject common-mode noise and accommodate typical DCR tolerances. The ILIM pin configures the effective sense voltage threshold (50/75/100mV), allowing direct use of DCR without external gain resistors.
How does the PGOOD pin function on LTC3769IUF#TRPBF?
The PGOOD pin on LTC3769IUF#TRPBF is an open-drain output that pulls low when the regulated feedback voltage (VFB) deviates by more than ±10% from the 1.200V reference for at least 45μs. It remains high during normal regulation and provides a clean, glitch-free signal for system power sequencing, fault logging, or microcontroller interrupt triggering - with no external pull-up required if driven into a logic input.
Can LTC3769IUF#TRPBF be synchronized to an external clock?
Yes, the LTC3769IUF#TRPBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock is applied, its internal phase-locked loop aligns the rising edge of the bottom gate (BG) signal to the external clock's rising edge. This enables EMI reduction through frequency coordination and multi-phase interleaving in systems with multiple converters.
What is the purpose of the EXTVCC pin on LTC3769IUF#TRPBF?
The EXTVCC pin on LTC3769IUF#TRPBF provides an alternative input to the internal 5.4V LDO that supplies INTVCC. When EXTVCC exceeds ~4.8V, the device disables the VBIAS-based LDO and switches to the EXTVCC LDO - reducing power dissipation and heat generation in high-input-voltage applications (e.g., 48V bus). If unused, EXTVCC must be tied to GND.
LTC3769IUF#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)
LTC3769IUF#TRPBF FAQ
1.How can I place an order for LTC3769IUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3769IUF#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 LTC3769IUF#TRPBF reliable?
The price and inventory of LTC3769IUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3769IUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3769IUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3769IUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3769IUF#TRPBF?
LTC3769IUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3769IUF#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 LTC3769IUF#TRPBF?
For technical support, including LTC3769IUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3769IUF#TRPBF requirements.
6.How does Aetrix verify that LTC3769IUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3769IUF#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 LTC3769IUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3769IUF#TRPBF?
All LTC3769IUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3769IUF#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 LTC3769IUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3769IUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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