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Analog Devices Inc. LT3579EFE#TRPBF
- Part No.:
- LT3579EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3579EFE#TRPBF.pdf
- Description:
- IC REG BST CHRG PUMP ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,051
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Product details
Overview
LT3579EFE#TRPBF from Analog Devices is a 6A, 42V dual-switch PWM DC/DC converter supporting boost, inverting, SEPIC, and flyback topologies. It delivers 12V at 1.7A or –12V at 1.2A from a 5V input, features integrated output short-circuit protection, 200kHz–2.5MHz programmable switching frequency, and operates across –40°C to 125°C junction temperature.
For engineers reviewing the LT3579EFE#TRPBF datasheet, LT3579EFE#TRPBF pinout, LT3579EFE#TRPBF application, or LT3579EFE#TRPBF equivalent, key selection criteria include master/slave current sharing (3.4A/2.6A), fault-protected GATE-driven PMOS disconnect, configurable UVLO via SHDN, and CLKOUT-based synchronization of multi-regulator systems.
Technical Context
The LT3579EFE#TRPBF implements constant-frequency current-mode control with dual NPN power switches (SW1/SW2) capable of combined 6A peak current. Its internal error amplifier compares FB voltage against 1.215V (boost) or 9mV (inverting) reference, while frequency foldback activates when FB is between 350mV and 900mV to improve startup current control.
It integrates fault detection for VIN overvoltage (>16.2V), SW overvoltage (>42V), SW overcurrent (>3.4A on SW1 or >6A combined), and die temperature (>165°C). The FAULT pin is bidirectional and actively pulls low during faults, triggering SS timeout sequencing and disabling CLKOUT and power switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V operating; 40V transient rating - supports automotive cold-crank and industrial 12V/24V rails. |
| Switch Current Limit | SW1: 3.4A min; SW1+SW2: 6A min - enables high-power local supplies without external current sensing. |
| Switch VCE(SAT) | 250mV typical at 5.5A - reduces conduction loss and thermal stress in high-current boost/flyback designs. |
| Switching Frequency | 200kHz to 2.5MHz, set by RT resistor or external SYNC - allows EMI optimization and compact magnetics. |
| Feedback Reference | 1.215V ±15mV (positive FB); 9mV ±6mV (negative FB) - ensures precise output regulation in both boost and inverting configurations. |
| Quiescent Current | 2.4mA typical (active); 1µA max (shutdown) - extends battery life in always-on systems. |
| Operating Temperature | –40°C to 125°C junction - qualified for under-hood automotive and industrial embedded applications. |
Pinout & Package
LT3579EFE#TRPBF is packaged in a 20-lead plastic TSSOP with exposed pad (Pin 21 = GND), θJA = 38°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 20) | Positive/Negative Feedback Input | Accepts voltage divider from VOUT; sets regulation point to 1.215V (boost) or 9mV (inverting) - enables single-resistor output programming. |
| VC (Pin 19) | Error Amplifier Output | Connects external compensation network (RC/CC) - stabilizes loop response across load/line variations. |
| GATE (Pin 1) | PMOS Gate Drive Output | Sinks up to 933µA; ramps with SS voltage - drives external PMOS for hot-plug-safe output disconnect during fault. |
| FAULT (Pin 2) | Bidirectional Fault Indicator | Pulled low internally on fault or externally asserted; triggers shutdown sequence and SS timeout - provides system-level fault signaling and recovery control. |
| VIN (Pin 3) | Main Input Supply | 2.5V–16V input rail; requires local ceramic bypass - powers internal circuitry and switch drivers. |
| SW1 (Pins 4–7) | Master Switch Collector | Handles 3.4A peak current; connects to inductor/transformer primary - forms main power path in all supported topologies. |
| SW2 (Pins 10–13) | Slave Switch Collector | Handles 2.6A peak current; ties to SW1 for 6A combined limit - enables high-current capability without external paralleling. |
| CLKOUT (Pin 14) | Buffered Oscillator Output | Drives compatible regulators synchronously; duty cycle varies linearly with junction temperature - serves dual role as sync source and on-chip thermal monitor. |
| SHDN (Pin 15) | Shutdown/UVLO Control | Active-high enable with 1.33V threshold; accepts slow-ramping signals - supports soft-start sequencing and programmable input undervoltage lockout. |
| RT (Pin 16) | Frequency Setting Input | Resistor-to-ground sets free-running frequency (200kHz–2.5MHz) - enables precise EMI band placement without external clock generator. |
| SYNC (Pin 17) | External Clock Input | Accepts 0.4V–1.3V logic levels; overrides RT setting - allows deterministic multi-phase timing in complex power trees. |
| SS (Pin 18) | Soft-Start Timing Node | Charges to 2.1V via internal 250kΩ; controls GATE ramp and switch current slew rate - prevents inrush and enables controlled fault recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-switch architecture | Eliminates need for external current-sharing components in 6A boost/inverting supplies - reduces BOM count and layout complexity. |
| Output short-circuit protection with PMOS disconnect | Combines FAULT-triggered GATE drive and SS-controlled timeout to safely isolate VOUT during shorts - protects downstream loads without manual intervention. |
| Configurable undervoltage lockout (UVLO) | Uses SHDN pin with external resistor divider to set custom VIN turn-on threshold - supports battery-powered systems with variable input profiles. |
| CLKOUT-based thermal monitoring | Provides real-time junction temperature tracking via duty cycle variation - enables predictive thermal management without external sensors. |
| Frequency foldback during startup | Reduces fSW when FB is out-of-regulation (350mV–900mV), lowering minimum on-time - prevents inductor saturation and improves reliability in high-capacitance loads. |
Applications
| Vacuum Fluorescent Display (VFD) Bias Supply | TFT-LCD Panel Bias Supply |
|---|---|
Use Scenario: Generating +30V and –30V bias rails from a 5V or 12V system supply for VFD anode and grid drive. IC Role / Device Role / Timing Role: Configured as dual-output inverting converter with independent feedback networks; uses SW1/SW2 for high-current negative rail generation. Use Value: Delivers stable, regulated ±30V at >1A per rail with built-in overvoltage and short-circuit protection - eliminates discrete protection circuitry and improves display reliability. | Use Scenario: Providing AVDD (+15V), VGH (+25V), and VGL (–10V) for TFT-LCD source/gate drivers in industrial HMIs. IC Role / Device Role / Timing Role: Operated in SEPIC mode for AVDD, inverting mode for VGL; synchronized via CLKOUT to reduce EMI coupling between rails. Use Value: Achieves tight regulation across wide load transients using current-mode control and fast fault response - prevents screen flicker and gate driver latch-up. |
| Automotive Engine Control Unit (ECU) Local Power | Industrial Programmable Logic Controller (PLC) I/O Module Supply |
Use Scenario: Generating isolated 5V and 3.3V rails from a noisy 12V vehicle battery in engine bay environments. IC Role / Device Role / Timing Role: Used in flyback configuration with optocoupler feedback; leverages 40V transient rating and –40°C to 125°C operation. Use Value: Maintains regulation during cold-crank (4.5V) and load-dump (36V) events while detecting and recovering from shorted secondary windings - meets AEC-Q100 stress requirements. | Use Scenario: Powering analog sensor front-ends and digital isolators in modular PLC backplanes with strict EMI limits. IC Role / Device Role / Timing Role: Configured as synchronous boost with external PMOS disconnect; synchronized to system clock via SYNC pin. Use Value: Enables deterministic switching alignment across multiple modules to suppress conducted emissions - simplifies CE/FCC compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#TRPBF | 4-switch synchronous buck-boost controller; no integrated power switches; requires external MOSFETs. | Supports wider VIN range (4V–36V); higher efficiency at light loads due to synchronous rectification. | Select when designing high-efficiency, medium-power buck-boost supplies where board space permits discrete FETs and layout complexity is acceptable. |
| LT8330EFE#TRPBF | Single-switch 6A boost converter; no slave switch or inverting capability; lower integration (no FAULT/GATE/CLKOUT). | Limited to boost-only topology; lacks fault-protected output disconnect and multi-regulator synchronization. | Select for cost-sensitive, single-rail boost applications where fault protection and topology flexibility are not required. |
Compared with LTC3789EFE#TRPBF and LT8330EFE#TRPBF, the LT3579EFE#TRPBF uniquely combines dual integrated switches, inverting/SEPIC/flyback configurability, and comprehensive fault protection in a single TSSOP package - making it optimal for space-constrained, multi-rail industrial and automotive bias supplies requiring robustness and design simplicity.
Availability
LT3579EFE#TRPBF is available at Aetrix Electronics and suitable for vacuum fluorescent display bias supplies, TFT-LCD panel power, and automotive ECU local power requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT3579EFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3579 product line delivers highly integrated, fault-protected DC/DC converters for demanding local power applications where reliability, topology flexibility, and protection integrity are critical - especially in automotive and industrial displays and control units.
FAQ
What topologies does the LT3579EFE#TRPBF support?
The LT3579EFE#TRPBF supports boost, inverting, SEPIC, and flyback configurations using its dual internal NPN switches. It can generate positive or negative outputs higher than the input voltage, such as 12V at 1.7A or –12V at 1.2A from 5V. The LT3579EFE#TRPBF achieves this through flexible pin routing and internal current-mode control - no external switch controllers or additional ICs are needed for these topologies.
How does the LT3579EFE#TRPBF protect against output short circuits?
The LT3579EFE#TRPBF detects output shorts via Sample Mode, which forces Q1/Q2 on every cycle to monitor inductor current. If SW1 current exceeds 3.4A or combined SW1+SW2 exceeds 6A, the FAULT pin pulls low, disabling switches and activating the GATE pin to turn off an external PMOS. The LT3579EFE#TRPBF then executes a timed SS pin charge/discharge sequence before attempting recovery - preventing thermal runaway and enabling automatic fault clearing.
Can the LT3579EFE#TRPBF synchronize with other switching regulators?
Yes, the LT3579EFE#TRPBF provides a buffered CLKOUT signal that matches its internal oscillator or external SYNC frequency and can drive the SYNC pins of other compatible regulators. Its CLKOUT also exhibits linear duty-cycle variation with junction temperature, allowing use as an on-die thermal monitor. The LT3579EFE#TRPBF's synchronization capability supports deterministic timing in multi-rail power systems to minimize beat frequencies and EMI.
What is the purpose of the GATE pin on the LT3579EFE#TRPBF?
The GATE pin on the LT3579EFE#TRPBF is a current-sinking output that drives the gate of an external PMOS transistor for output disconnect during faults. Its pull-down current ramps linearly with the SS pin voltage, reaching 933µA above 500mV - enabling soft turn-on of the PMOS to limit inrush. During a fault, the LT3579EFE#TRPBF disables GATE drive, allowing the external RGATE resistor to pull the PMOS gate high and break the power path - protecting downstream circuitry.
Does the LT3579EFE#TRPBF require external compensation components?
Yes, the LT3579EFE#TRPBF requires external compensation components connected to the VC pin (error amplifier output) to stabilize the control loop. A standard Type II network - typically one series RC and one parallel capacitor - is used. Component values depend on topology, output capacitance, and desired phase margin. The LT3579EFE#TRPBF datasheet provides design equations and stability guidelines for boost, inverting, and SEPIC configurations to ensure robust transient response across operating conditions.
LT3579EFE#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
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, Charge Pump, Cuk, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.215V
- Voltage - Output (Max):
- 42V (Switch)
- Current - Output:
- 6A (Switch)
- Frequency - Switching:
- 200kHz ~ 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT3579EFE#TRPBF FAQ
1.How can I place an order for LT3579EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3579EFE#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 LT3579EFE#TRPBF reliable?
The price and inventory of LT3579EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3579EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3579EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3579EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3579EFE#TRPBF?
LT3579EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3579EFE#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 LT3579EFE#TRPBF?
For technical support, including LT3579EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3579EFE#TRPBF requirements.
6.How does Aetrix verify that LT3579EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3579EFE#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 LT3579EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3579EFE#TRPBF?
All LT3579EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3579EFE#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 LT3579EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3579EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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