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Analog Devices Inc. LTC3769IFE#TRPBF
- Part No.:
- LTC3769IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3769IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,538
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Product details
Overview
LTC3769IFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance synchronous boost controller IC driving dual N-channel MOSFETs in high-efficiency DC/DC step-up converters. 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-enabling battery-powered industrial power supplies and automotive auxiliary rails.
For engineers reviewing the LTC3769IFE#TRPBF datasheet, LTC3769IFE#TRPBF pinout, LTC3769IFE#TRPBF application, or LTC3769IFE#TRPBF 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 with exposed pad for high-power density designs.
Technical Context
The LTC3769IFE#TRPBF implements constant-frequency current-mode control with an internal error amplifier, transconductance EA (2 mmho), and precision 1.200V ±1% reference. Its peak-current sensing architecture uses SENSE+/SENSE− inputs with configurable thresholds (42–110 mV) set via ILIM pin connection (GND/FLOAT/INTVCC), enabling accurate overcurrent protection across varying load and temperature conditions.
It integrates dual gate drivers with matched 20 ns rise/fall times, 1.2 Ω pull-up/pull-down resistance, and 30 ns dead-time control. The internal 5.4V LDO powers logic and drivers from VBIAS or EXTVCC (switchover at 4.8V), while phase-lockable PLL synchronizes BG edge to external clocks (75–850 kHz), supporting noise-sensitive multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V input; operates down to 2.3V after startup when biased from VOUT-supports cold-crank automotive and wide-chemistry battery inputs. |
| VOUT Max | 60V regulated output-enables high-voltage LED strings, industrial sensors, and isolated bias supplies without external regulation. |
| Reference Voltage | ±1% accuracy at 1.200V (1.188–1.212V)-ensures tight output regulation across temperature and line/load variations. |
| IQ (No Load) | 28μA in pulse-skipping/forced continuous mode-extends runtime in always-on battery systems like medical telemetry. |
| Switching Frequency | Programmable 50kHz–900kHz or syncable 75kHz–850kHz-allows EMI optimization and inductor size reduction in space-constrained layouts. |
| Current Sense Threshold | Configurable 42/75/100 mV via ILIM pin-supports precise current limiting with low-value sense resistors or DCR sensing for minimal power loss. |
| Shutdown Current | 4μA at RUN < 0.7V-enables ultra-low-power system sleep states without external disconnect circuitry. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE) with exposed thermal pad (Pin 21), rated θJA = 38°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (Pin 1) | Main supply input | Accepts 4.5V–60V; powers internal circuits and enables operation down to 2.3V post-startup when tied to VOUT. |
| PGOOD (Pin 2) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from 1.2V for ≥45μs-provides reliable system-level power sequencing and fault signaling. |
| ILIM (Pin 3) | Current limit threshold select | GND/FLOAT/INTVCC sets peak sense voltage to 50/75/100 mV-configures overcurrent trip point without external components. |
| GND (Pins 4, 21) | Signal and thermal ground | Multiple GND pins + exposed pad ensure low-impedance return path and thermal dissipation for high-current gate drive. |
| PLLIN/MODE (Pin 5) | Sync input / light-load mode control | Accepts external clock (75–850 kHz) or selects Burst Mode®/pulse-skipping/forced continuous-optimizes efficiency across load range. |
| RUN (Pin 6) | Enable/shutdown control | 1.28V threshold with 100mV hysteresis; sinking <0.7V reduces IQ to 4μA-enables precise undervoltage lockout and system-level power management. |
| SS (Pin 7) | Soft-start ramp control | Internal 10μA current charges external capacitor-linearly ramps VOUT from 0V to final value, preventing inrush current and output overshoot. |
| SENSE− (Pin 8) | Negative current sense input | Common-mode range: 2.3V–60V; accepts low-side resistor or DCR sensing-enables accurate current measurement in high-VIN applications. |
| SENSE+ (Pin 9) | Positive current sense input | Supplies bias to current comparator; common-mode range matches SENSE−-supports high-side or low-side sensing topologies. |
| VFB (Pin 10) | Error amplifier feedback input | Compares divider output to 1.200V reference; ±5 nA input bias minimizes resistor-divider error-ensures stable regulation with high-impedance dividers. |
| ITH (Pin 11) | Error amp output / current threshold | Voltage sets peak inductor current; 0.425V sleep threshold enables Burst Mode®-directly links load demand to switching behavior. |
| OVMODE (Pin 12) | Overvoltage protection mode select | GND enables OV shutdown (TG forced on); INTVCC disables OV action-gives system designer fail-safe or graceful-degradation options. |
| SW (Pin 13) | Switch node | Connects to source of synchronous FET and drain of main FET-must be routed with low-inductance layout to minimize switching losses and EMI. |
| TG (Pin 14) | Top gate driver output | Drives gate of synchronous N-MOSFET; 1.2Ω pull-up/pull-down and 20ns edges support fast, low-loss transitions at high frequencies. |
| BOOST (Pin 15) | Floating supply for TG driver | Bypassed to SW with ceramic capacitor; powered via Schottky from INTVCC-enables high-side N-MOSFET drive without bootstrap complexity. |
| BG (Pin 16) | Bottom gate driver output | Drives gate of main N-MOSFET; matched timing to TG ensures robust dead-time control and prevents shoot-through. |
| EXTVCC (Pin 18) | External bias input for INTVCC LDO | Switchover at 4.8V; bypasses VBIAS LDO to reduce power loss-ideal for systems with clean auxiliary 5V/12V rails. |
| INTVCC (Pins 2, 17) | Internal 5.4V LDO output | Powers gate drivers and logic; requires ≥4.7μF low-ESR ceramic cap-stable local supply critical for consistent gate drive strength. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET control | Eliminates external diode conduction loss-boosts efficiency by 5–15% vs. diode-based designs, reducing heat sink requirements in 120W+ applications. |
| 100% duty cycle capability | Enables VOUT ≈ VIN operation-supports seamless pass-through during brownout or low-input conditions without dropout or regulation loss. |
| RSENSE or inductor DCR sensing | Reduces BOM count and board area-avoids dedicated sense resistor, lowering cost and power loss in high-current (>5A) designs. |
| Programmable light-load modes | Burst Mode®, pulse-skipping, or forced continuous-delivers >90% efficiency at 10mA load (Burst) and smooth regulation at full load (FCM). |
| Power Good (PGOOD) monitor | Active-low open-drain output with 45μs delay-integrates directly into FPGA/CPU reset chains without external comparators or timers. |
| Thermally enhanced TSSOP | Exposed pad + 38°C/W θJA-supports 5A+ output currents in compact industrial modules without forced air cooling. |
Applications
| Automotive Auxiliary Power | Industrial Sensor Bias Supply |
|---|---|
|
Use Scenario: Generating stable 24V rail from 9–16V vehicle battery for radar modules and camera systems during cold-crank (down to 6V) and load-dump events. IC Role / Device Role / Timing Role: Synchronous boost controller regulating output with ±1% accuracy while maintaining operation down to 2.3V input post-startup. Use Value: Eliminates need for pre-regulator stages; 28μA quiescent current prevents battery drain during vehicle sleep mode. |
Use Scenario: Providing isolated 48V bias for MEMS pressure sensors and analog front-ends in factory automation PLCs with wide ambient temperature range. IC Role / Device Role / Timing Role: High-voltage boost controller delivering 48V @ 100mA with programmable 50–900kHz switching to avoid sensitive communication bands. Use Value: ±1% reference and 42–110mV current sense thresholds enable precise sensor excitation and fault detection under varying load conditions. |
| Medical Telemetry Transmitter | Military Portable Radio Power |
|
Use Scenario: Step-up converter powering 3.3V/5V RF transmitter from single Li-ion cell (2.7–4.2V), requiring ultra-low standby current and EMI-controlled switching. IC Role / Device Role / Timing Role: Low-IQ boost controller with Burst Mode® operation and phase-lockable frequency for coexistence with wireless protocols. Use Value: 4μA shutdown current extends device shelf life; 75–850kHz synchronization avoids interference with Bluetooth/Wi-Fi bands. |
Use Scenario: Ruggedized 28V power module for handheld radios operating from 12–30V military batteries across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Wide-input, high-reliability boost controller with 150°C junction rating (I-grade), EXTVCC switchover, and robust OVP configuration. Use Value: Dual OVMODE options (GND/INTVCC) allow fail-safe shutdown or graceful degradation during field faults-meeting MIL-STD-1275E surge immunity. |
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#TRPBF | Fixed 100kHz–1MHz frequency range; no PLL sync; higher 100μA IQ; supports SEPIC/Ćuk topologies. | Less suitable for noise-sensitive systems requiring clock synchronization; better for cost-sensitive SEPIC designs. | Select LT3757A when multi-topology flexibility is needed and EMI synchronization is not required. |
| TPS40210DGQR | Lower 3.5V–52V VIN; 500kHz max frequency; no EXTVCC option; 1.5% reference tolerance; no Burst Mode®. | Not viable for 60V output or sub-2.3V post-startup operation; limited light-load efficiency in battery systems. | Choose TPS40210 only for lower-voltage (<48V), non-battery, cost-driven industrial supplies where 1.5% regulation is acceptable. |
Compared with LT3757AEDD#TRPBF and TPS40210DGQR, the LTC3769IFE#TRPBF uniquely combines 60V output capability, 28μA quiescent current, phase-lockable frequency, and 100% duty cycle-making it the only choice for high-efficiency, wide-input, synchronized boost in automotive and portable medical systems.
Availability
LTC3769IFE#TRPBF is available at Aetrix Electronics and suitable for industrial sensor bias supplies, automotive auxiliary power rails, medical telemetry transmitters, and military portable radio power systems requiring stable component supply, extended temperature operation (–40°C to +125°C), and long-term lifecycle continuity.
Supply support for LTC3769IFE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3769IFE#TRPBF belongs to Linear's high-efficiency power controller product line, designed specifically for synchronous boost architectures demanding ultra-low quiescent current, wide input range, and robust operation in harsh environments.
FAQ
What is the minimum input voltage for LTC3769IFE#TRPBF after startup?
The LTC3769IFE#TRPBF operates down to 2.3V after startup when VBIAS is powered from the output rail (VOUT) or another auxiliary supply. This feature enables continued regulation during deep battery discharge or cold-crank conditions where input voltage drops below the normal 4.5V minimum. Startup still requires ≥4.5V on VBIAS.
How does the ILIM pin configure current sensing on LTC3769IFE#TRPBF?
The ILIM pin on LTC3769IFE#TRPBF sets the peak current sense threshold: tying to GND selects 50mV, floating selects 75mV, and connecting to INTVCC selects 100mV. This allows precise overcurrent protection tuning without external resistors-critical for matching sense resistor values or DCR coefficients across different inductor selections in the LTC3769IFE#TRPBF design.
Can LTC3769IFE#TRPBF synchronize to an external clock, and what is the supported range?
Yes, LTC3769IFE#TRPBF supports external clock synchronization via the PLLIN/MODE pin across 75kHz to 850kHz. When an external clock is applied, the internal PLL aligns the rising edge of the bottom gate (BG) signal to the external clock's rising edge-enabling deterministic switching in multi-converter systems to minimize beat frequencies and conducted EMI in the LTC3769IFE#TRPBF application.
What is the purpose of the OVMODE pin on LTC3769IFE#TRPBF, and how does it affect overvoltage response?
The OVMODE pin on LTC3769IFE#TRPBF determines overvoltage protection behavior: grounding it enables active OV shutdown (top gate forced on until fault clears), while tying it to INTVCC disables forced shutdown-allowing normal regulation to continue. This gives designers fail-safe or graceful-degradation options depending on system safety requirements in the LTC3769IFE#TRPBF implementation.
Does LTC3769IFE#TRPBF support both RSENSE and inductor DCR current sensing?
Yes, LTC3769IFE#TRPBF supports both methods. Its SENSE+/SENSE− differential inputs accept either a discrete sense resistor or the voltage drop across inductor DCR. The common-mode range (2.3V–60V) and low input bias current (±1 µA on SENSE−) ensure accuracy with high-impedance DCR networks-reducing component count and conduction loss in high-current LTC3769IFE#TRPBF designs.
LTC3769IFE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3769IFE#TRPBF FAQ
1.How can I place an order for LTC3769IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3769IFE#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 LTC3769IFE#TRPBF reliable?
The price and inventory of LTC3769IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3769IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3769IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3769IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3769IFE#TRPBF?
LTC3769IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3769IFE#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 LTC3769IFE#TRPBF?
For technical support, including LTC3769IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3769IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3769IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3769IFE#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 LTC3769IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3769IFE#TRPBF?
All LTC3769IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3769IFE#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 LTC3769IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3769IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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