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Analog Devices Inc. LTC3789EUFD#TRPBF
- Part No.:
- LTC3789EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3789EUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,083
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Product details
Overview
LTC3789EUFD#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, synchronous 4-switch buck-boost DC/DC controller IC that regulates output voltage across input voltages above, below, or equal to VOUT. It delivers up to 98% efficiency, supports 4V–38V input/output range, features programmable current sensing, and operates in automotive power systems with seamless buck-boost transitions.
For engineers reviewing the LTC3789EUFD#TRPBF datasheet, LTC3789EUFD#TRPBF pinout, LTC3789EUFD#TRPBF application, or LTC3789EUFD#TRPBF equivalent, key selection criteria include its quad N-channel MOSFET drive capability, phase-lockable 200–600kHz switching frequency, ±10% PGOOD accuracy, 1% output voltage regulation, and support for battery charging via output current feedback loop.
Technical Context
The LTC3789EUFD#TRPBF implements a constant-frequency current-mode control architecture with dual independent current-sense paths: valley-current sensing in buck mode and peak-current sensing in boost mode. Its proprietary 4-switch topology enables continuous conduction across all three operating regions-buck, buck-boost, and boost-with no discontinuity or audible noise during transitions.
It integrates two floating gate drivers (TG1/BG1 and TG2/BG2), internal 5.5V LDO for INTVCC, EXTVCC switchover logic, and a dedicated ITH compensation node. The MODE/PLLIN pin selects between pulse-skipping (high light-load efficiency) and forced continuous mode (EMI-controlled fixed frequency), while FREQ pin sets oscillator frequency via external resistor or DC voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input/Output Range | 4V to 38V - supports wide automotive battery transients and industrial rail variations without external pre-regulation |
| Output Voltage Accuracy | ±1% over 0.8V–38V - ensures stable reference for precision analog or microcontroller supply rails |
| Switching Frequency | 200kHz–600kHz (phase-lockable) - enables EMI filtering optimization and magnetics size reduction |
| Peak Efficiency | Up to 98% - minimizes thermal stress and extends battery runtime in portable/high-power systems |
| Current Sense Threshold | Programmable 48–160mV - allows flexible RSENSE selection for trade-off between loss and noise immunity |
| PGOOD Accuracy | ±10% of setpoint - provides reliable system-level power-good signaling for sequenced startup |
| Operating Junction Temp | –40°C to +125°C - qualified for under-hood automotive and industrial ambient conditions |
Pinout & Package
The LTC3789EUFD#TRPBF is housed in a thermally enhanced 28-lead (4mm × 5mm) plastic QFN package with exposed pad (Pin 29 = SGND), θJA = 34°C/W. This package enables high-current gate drive delivery and efficient heat dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 26) | Error amplifier feedback input | Connects to resistive divider on VOUT; sets regulated output voltage with ±1% accuracy |
| ITH (Pin 2) | Error amplifier output & current limit control | Directly programs peak/valley current thresholds; used for loop compensation and current regulation |
| MODE/PLLIN (Pin 4) | Mode selection / external sync input | Tie to SGND for forced CCM; to INTVCC for pulse-skipping; apply clock for PLL synchronization |
| FREQ (Pin 5) | Oscillator frequency programming | 10µA sink current enables precise resistor-based frequency setting from 200–600kHz |
| TG1, BG1, TG2, BG2 (Pins 23,20,14,16) | Quad N-MOSFET gate drivers | Drive top/bottom switches with 2.6Ω pull-up / 1.5Ω pull-down RDS(on); support >5A load capability |
| PGOOD (Pin 25) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from 0.8V reference after 20µs debounce |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor 4-switch architecture | Eliminates need for separate buck + boost converters; reduces BOM count and board area by >30% vs dual-stage solutions |
| True soft-start & short-circuit protection | Prevents inrush current and limits fault energy even during boost-mode startup or output short events |
| VOUT disconnect during shutdown | Blocks reverse current path from output to input, protecting upstream sources and enabling safe hot-swap operation |
| No reverse current at startup | Ensures clean, monotonic VOUT ramp without backfeeding into VIN rail - critical for battery-powered systems |
| Internal charge pump for bootstrap capacitors | Maintains gate drive voltage on top-side MOSFETs during extended duty cycles (e.g., pure buck or boost), avoiding external charge pump ICs |
Applications
| Automotive Infotainment Power | Distributed Telecom DC Power |
|---|---|
Use Scenario: Powering 12V display modules and audio amplifiers from variable 9–16V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Buck-boost controller maintaining stable 12V output during engine start (VIN dips to 4V) and alternator overvoltage (VIN spikes to 38V). Use Value: Seamless transition eliminates brownouts and resets; 98% efficiency reduces cabin heat generation and extends battery life. | Use Scenario: Generating isolated 48V intermediate bus from 36–72V telecom rectifier output for downstream POL converters. IC Role / Device Role / Timing Role: Primary non-isolated buck-boost regulator delivering high-current 48V with tight line/load regulation and low noise. Use Value: Wide 4V–38V input range accommodates full telecom input spec; phase-lockable frequency simplifies EMI filter design across multiple boards. |
| High-Power Portable Medical Devices | Industrial PLC I/O Module Supply |
Use Scenario: Providing regulated 5V/3.3V rails for FPGA, ADCs, and wireless radios from 2-cell Li-ion (6–8.4V) or 3-cell (9–12.6V) battery packs. IC Role / Device Role / Timing Role: Synchronous buck-boost controller supporting battery discharge down to 4V while maintaining constant output voltage and current limit. Use Value: Programmable input/output current sense enables accurate battery fuel gauging and overcurrent protection without additional sense amps. | Use Scenario: Powering 24V fieldbus interfaces and analog sensor front-ends from unregulated 18–36V industrial DC bus with high ripple rejection. IC Role / Device Role / Timing Role: High-efficiency buck-boost regulator with forced continuous mode to suppress conducted EMI in noise-sensitive measurement circuits. Use Value: Fixed-frequency operation avoids spectral spreading; ±1% VOUT accuracy ensures consistent sensor excitation and ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8705EFE#TRPBF | Wider 2.8V–80V input range; includes integrated current monitor and digital interface; higher quiescent current (12mA vs 3mA) | Better suited for ultra-wide-input solar or industrial HV systems; lacks direct PGOOD output | Select LT8705EFE#TRPBF when input exceeds 38V or digital telemetry is required; LTC3789EUFD#TRPBF preferred for cost-sensitive 4–38V automotive designs |
| MPQ4332GR-AEC1 | Integrated power stage (MOSFETs); lower max output current (3.5A vs >10A discrete); AEC-Q100 Grade 1 qualified | Targeted at space-constrained automotive ECUs where integration outweighs flexibility | Choose MPQ4332GR-AEC1 for simplified layout and qualification-ready designs; LTC3789EUFD#TRPBF retains full discrete MOSFET selection freedom and higher power scalability |
Compared with LT8705EFE#TRPBF and MPQ4332GR-AEC1, the LTC3789EUFD#TRPBF offers superior thermal performance (θJA = 34°C/W), finer current-sense resolution (48–160mV range), and true VOUT disconnection - making it optimal for high-reliability, high-efficiency 4–38V systems requiring discrete power stage optimization.
Availability
LTC3789EUFD#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, distributed telecom power, and high-power portable medical devices requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3789EUFD#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 legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification standards.
The LTC3789EUFD#TRPBF belongs to Linear's high-efficiency synchronous controller product line, designed specifically for single-inductor buck-boost applications demanding seamless mode transitions, wide input/output ranges, and robust protection in harsh environments.
FAQ
What is the maximum supported switching frequency for the LTC3789EUFD#TRPBF?
The LTC3789EUFD#TRPBF supports a phase-lockable fixed-frequency range from 200kHz to 600kHz. At VFREQ = 2.4V, typical nominal frequency is 640kHz (max 710kHz), but operation above 600kHz requires verification of gate drive strength and layout parasitics. The datasheet specifies 600kHz as the maximum guaranteed synchronizable frequency.
Does the LTC3789EUFD#TRPBF support battery charging functionality?
Yes, the LTC3789EUFD#TRPBF supports battery charging via its output current feedback loop. Using the IOSENSE+ and IOSENSE– pins, it monitors average output current and regulates charge current independently of output voltage - enabling constant-current/constant-voltage (CC/CV) charging profiles when combined with appropriate external circuitry and control logic.
How does the LTC3789EUFD#TRPBF handle buck-boost region transitions?
The LTC3789EUFD#TRPBF uses a proprietary control algorithm that dynamically sequences TG1/BG1 and TG2/BG2 to maintain continuous conduction during VIN ≈ VOUT transitions. It alternates between buck-like and boost-like sub-cycles within a single clock period, eliminating voltage glitches or discontinuities - verified by typical performance curves showing <10mV output ripple during region crossing.
What is the purpose of the EXTVCC pin on the LTC3789EUFD#TRPBF?
The EXTVCC pin on the LTC3789EUFD#TRPBF allows external powering of the internal 5.5V LDO (INTVCC). When EXTVCC > 4.8V, the IC switches from VIN-derived to EXTVCC-derived INTVCC, reducing power dissipation and improving efficiency - especially useful when powering INTVCC from the LTC3789EUFD#TRPBF's own regulated output rail.
Can the LTC3789EUFD#TRPBF operate with only two MOSFETs instead of four?
No, the LTC3789EUFD#TRPBF requires four external N-channel MOSFETs - two high-side (driven by TG1/TG2) and two low-side (driven by BG1/BG2) - to implement its 4-switch buck-boost topology. Omitting any switch disables proper region transition logic, compromises current sensing, and violates absolute maximum ratings for SWx and BOOSTx pins.
LTC3789EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Number of Outputs:
- 2
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 38V
- Frequency - Switching:
- 200kHz ~ 640kHz
- Duty Cycle (Max):
- 90%
- 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:
- 28-QFN (4x5)
LTC3789EUFD#TRPBF FAQ
1.How can I place an order for LTC3789EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3789EUFD#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 LTC3789EUFD#TRPBF reliable?
The price and inventory of LTC3789EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3789EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3789EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3789EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3789EUFD#TRPBF?
LTC3789EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3789EUFD#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 LTC3789EUFD#TRPBF?
For technical support, including LTC3789EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3789EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3789EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3789EUFD#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 LTC3789EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3789EUFD#TRPBF?
All LTC3789EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3789EUFD#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 LTC3789EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3789EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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