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Analog Devices Inc. LTC3769EFE#PBF
- Part No.:
- LTC3769EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3769EFE#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:700
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Product details
Overview
LTC3769EFE#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 quiescent current, and operates down to 2.3V after startup when biased from VOUT - enabling battery-backed systems with extended runtime.
For engineers reviewing the LTC3769EFE#PBF datasheet, LTC3769EFE#PBF pinout, LTC3769EFE#PBF application, or LTC3769EFE#PBF equivalent, key selection criteria include its wide VIN range, programmable 50kHz–900kHz switching frequency, RSENSE/DCR current sensing flexibility, 100% duty cycle capability, and thermally enhanced 20-lead TSSOP package rated for –40°C to 125°C operation.
Technical Context
The LTC3769EFE#PBF implements constant-frequency current-mode control with dual gate drivers (TG/BG), internal 5.4V LDO (INTVCC), and selectable light-load modes (Burst Mode®, pulse-skipping, forced continuous) via PLLIN/MODE pin. Its error amplifier compares VFB against a precision 1.200V reference, while ITH sets peak inductor current threshold.
It integrates phase-lockable oscillator (75kHz–850kHz sync range), power-good monitoring (±10% trip with 45μs delay), overvoltage protection (OVMODE-selectable), and EXTVCC switchover (4.5V–5.0V threshold) to reduce VBIAS LDO dissipation - supporting high-efficiency, thermally constrained boost designs.
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 VBIAS powered from VOUT - enables cold-cranking and low-battery resilience. |
| Output Voltage Range | Up to 60V regulated; set via external resistor divider on VFB - supports high-voltage LED drivers, industrial sensors, and telecom interfaces. |
| Reference Voltage | 1.200V ±1% (–40°C to 125°C); low tempco ensures stable regulation across automotive and industrial temperature ranges. |
| Quiescent Current | 28μA in no-load operation; extends battery life in always-on systems such as telematics and remote monitoring. |
| Switching Frequency | Programmable 50kHz–900kHz (resistor or voltage on FREQ pin); enables optimization of size (high-freq) vs. efficiency (low-freq) in PCB layout. |
| Current Sensing | RSENSE or inductor DCR sensing; ILIM pin selects 42mV/68mV/90mV thresholds - supports accurate overcurrent protection with minimal BOM cost. |
| Package & Temp Range | 20-Lead Plastic SSOP (FE); –40°C to 125°C operating junction temperature - qualified for under-hood automotive and harsh-environment industrial use. |
Pinout & Package
Package: 20-Lead Plastic SSOP (FE), exposed pad (Pin 21) connected to GND for thermal and electrical performance. θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (Pin 1) | Main supply input | Accepts 4.5V–60V; powers internal circuits and INTVCC LDO - can be tied to VIN or VOUT for low-input 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) | Peak current sense threshold select | GND/float/INTVCC sets 50mV/75mV/100mV comparator threshold - configures current limit without external resistors. |
| GND (Pins 4, 21) | Signal and power ground | Multiple GND pins + exposed pad must be soldered to PCB plane - critical for noise immunity and thermal management. |
| PLLIN/MODE (Pin 5) | Sync input / light-load mode control | Enables external clock sync (75kHz–850kHz); selects Burst Mode® (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced continuous (INTVCC). |
| RUN (Pin 6) | Enable/shutdown control | 1.28V threshold for soft shutdown; <0.7V forces full shutdown (4μA IQ) - supports controlled power sequencing and battery cutoff. |
| SS (Pin 7) | Soft-start ramp control | Internal 10μA current charges external capacitor - linearly ramps VOUT during startup to limit inrush and stress on MOSFETs/capacitors. |
| SENSE– (Pin 8) | Negative current sense input | Connects to low-side of sense resistor or inductor DCR - common-mode range: 2.3V–60V (65V abs max). |
| SENSE+ (Pin 9) | Positive current sense input | Connects to high-side of sense resistor; supplies bias to current comparator - same common-mode range as SENSE–. |
| VFB (Pin 10) | Feedback input to error amplifier | Compares divided VOUT against 1.200V reference; ±5nA input bias enables high-impedance dividers for low power loss. |
| ITH (Pin 11) | Error amp output / current limit threshold | Voltage sets peak inductor current; also used for loop compensation - direct interface to Type II/III compensation networks. |
| OVMODE (Pin 12) | Overvoltage protection mode select | GND enables OV latch-off (TG forced on); INTVCC disables OV protection - allows flexible safety architecture per system requirements. |
| SW (Pin 13) | Switch node connection | Connects to source of synchronous MOSFET, drain of main MOSFET, and inductor - high dV/dt node requiring tight layout and guard ring. |
| TG (Pin 14) | Top gate driver output | Drives gate of synchronous N-MOSFET; 1.2Ω pull-up/pull-down, 20ns rise/fall - supports fast switching with low gate charge loss. |
| BOOST (Pin 15) | Floating supply for TG driver | Bypassed to SW with ceramic cap; charged via Schottky from INTVCC - enables high-side N-MOSFET drive without external bootstrap components. |
| BG (Pin 16) | Bottom gate driver output | Drives gate of main N-MOSFET; identical drive strength to TG - ensures matched timing and minimized shoot-through risk. |
| EXTVCC (Pin 18) | External bias input for INTVCC LDO | Switchover at 4.5V–5.0V; bypasses VBIAS LDO to reduce heat - ideal when auxiliary 5V/12V rail is available. |
| INTVCC (Pins 2, 17) | Internal 5.4V LDO output | Powers gate drivers and control logic; requires ≥4.7μF low-ESR ceramic cap to GND - decoupling critical for stability at high load transients. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET control | Eliminates external Schottky diode losses, increasing efficiency by 5–15% and reducing thermal load in 120W-class boost converters. |
| 100% duty cycle capability | Allows VOUT ≈ VIN during input brownouts - maintains regulated output even when input dips below nominal, e.g., automotive cold-crank. |
| Three selectable light-load modes | Burst Mode® (28μA IQ), pulse-skipping, or forced continuous - enables optimal tradeoff between efficiency and output ripple across full load range. |
| Programmable overvoltage response | OVMODE pin configures latch-off (safe shutdown) or graceful foldback - meets functional safety requirements for automotive and medical systems. |
| Robust thermal design | Exposed-pad SSOP package with θJA = 38°C/W and integrated overtemperature protection - sustains 125°C ambient in convection-cooled enclosures. |
Applications
| Automotive Infotainment Power | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Powering 24V display backlight and audio amplifiers from 9V–16V vehicle battery with cold-crank support down to 2.3V. IC Role / Device Role / Timing Role: Synchronous boost controller regulating 24V/5A output; manages gate timing, current limiting, and PGOOD sequencing. Use Value: 100% duty cycle prevents dropout during engine start; 28μA quiescent current minimizes parasitic drain on parked vehicle battery. |
Use Scenario: Generating stable 15V bias for precision op-amps and ADCs in factory-floor vibration sensors powered from 12V industrial bus. IC Role / Device Role / Timing Role: High-PSRR, low-noise boost controller with RSENSE current sensing and soft-start for EMI-sensitive analog front-ends. Use Value: ±1% 1.200V reference and <0.1% load regulation ensure <10ppm gain drift; programmable frequency avoids noise coupling into signal band. |
| Medical Portable Imaging Module | Military UAV Payload Power |
|
Use Scenario: Supplying 48V for CCD/CMOS image sensor bias and FPGA core rails from Li-ion battery pack (8.4V–12.6V). IC Role / Device Role / Timing Role: Isolated, high-reliability boost controller with OVMODE-configurable fault response and EXTVCC switchover for thermal margin. Use Value: –40°C to 125°C rating ensures operation in sterilization cycles; 4μA shutdown current preserves battery for emergency diagnostics. |
Use Scenario: Converting 28V aircraft bus to 50V for RF transceiver PA stage in compact UAV payload with strict SWaP-C constraints. IC Role / Device Role / Timing Role: High-efficiency synchronous controller with phase-lockable frequency for EMI compliance in shared avionics bays. Use Value: 75kHz–850kHz sync range enables spread-spectrum alignment with master clock; 20-lead SSOP fits dense HDI layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757AEDD#PBF | Wider VIN range (2.8V–100V), but fixed 1.21V ref (±2%), higher IQ (100μA), no EXTVCC or OVMODE pin - lacks programmable OV response and thermal efficiency. | Preferred for ultra-wide input (e.g., 48V telecom rectified) where OV latching is not required; unsuitable for battery runtime-critical designs. | Select LTC3769EFE#PBF when ±1% reference, 28μA IQ, and configurable OV protection are mandatory - especially in automotive and medical systems. |
| TPS40210DGQ | Lower VIN min (4.5V), no 100% duty cycle, no Burst Mode®, only 1.23V ref (±2.5%), no PGOOD or EXTVCC - limited light-load efficiency and safety features. | Suitable for cost-sensitive industrial supplies where light-load efficiency and functional safety are secondary. | Choose LTC3769EFE#PBF for applications demanding high accuracy, ultra-low IQ, and robust fault handling - particularly where regulatory compliance (AEC-Q100, IEC 60601) applies. |
Compared with LT3757AEDD#PBF and TPS40210DGQ, the LTC3769EFE#PBF delivers superior reference accuracy (±1% vs. ±2–2.5%), lower quiescent current (28μA vs. 100μA/2mA), and configurable overvoltage response - directly enabling longer battery life, tighter output regulation, and certified safety architectures.
Availability
LTC3769EFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor conditioning, and portable medical imaging applications requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to 125°C operation.
Supply support for LTC3769EFE#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, inheriting its legacy of high-performance analog and power management ICs. The company specializes in precision signal chain and power solutions for demanding applications.
The LTC3769EFE#PBF belongs to Linear's high-efficiency synchronous controller product line, designed specifically for high-power boost conversion in automotive, industrial, and medical systems where reliability, thermal performance, and low-noise operation are critical.
FAQ
What is the minimum input voltage for LTC3769EFE#PBF after startup?
The LTC3769EFE#PBF operates down to 2.3V after startup when VBIAS is powered from the output (VOUT) or an auxiliary supply. This enables continued regulation during deep battery discharge or cold-crank events in automotive systems. Startup still requires ≥4.5V on VBIAS.
Does LTC3769EFE#PBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC3769EFE#PBF supports both methods. SENSE+ and SENSE– accept common-mode voltages from 2.3V to 60V, and the ILIM pin selects peak sense thresholds (42mV/68mV/90mV) - allowing direct integration with either discrete shunts or low-cost DCR-based sensing networks.
How does the EXTVCC pin improve thermal performance in LTC3769EFE#PBF?
The EXTVCC pin enables switchover from the VBIAS-powered INTVCC LDO (5.4V) to an external 4.5V–14V supply when EXTVCC exceeds ~4.8V. This bypasses the VBIAS LDO's power dissipation, reducing die temperature - especially beneficial in high-VIN, high-current boost designs where VBIAS-to-INTVCC drop causes significant heat.
Can LTC3769EFE#PBF achieve 100% duty cycle, and what is its practical benefit?
Yes, the LTC3769EFE#PBF supports 100% duty cycle operation, allowing VOUT to track VIN closely during input voltage sags. This prevents output dropout in automotive cold-crank (e.g., 2.3V–16V input) or backup battery scenarios - maintaining system functionality without requiring oversized output capacitance.
What are the three light-load operating modes of LTC3769EFE#PBF, and how are they selected?
The LTC3769EFE#PBF offers Burst Mode® (28μA IQ), pulse-skipping, and forced continuous conduction - selected via the PLLIN/MODE pin: GND = Burst Mode®, INTVCC = forced continuous, and 1.2V–(INTVCC–1.3V) = pulse-skipping. This enables precise efficiency/ripple tradeoffs across the full load range without external circuitry.
LTC3769EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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:
- 20-TSSOP-EP
LTC3769EFE#PBF FAQ
1.How can I place an order for LTC3769EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3769EFE#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 LTC3769EFE#PBF reliable?
The price and inventory of LTC3769EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3769EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3769EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3769EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3769EFE#PBF?
LTC3769EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3769EFE#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 LTC3769EFE#PBF?
For technical support, including LTC3769EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3769EFE#PBF requirements.
6.How does Aetrix verify that LTC3769EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3769EFE#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 LTC3769EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3769EFE#PBF?
All LTC3769EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3769EFE#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 LTC3769EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3769EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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