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Analog Devices Inc. LT3579EFE-1#TRPBF
- Part No.:
- LT3579EFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3579EFE-1#TRPBF.pdf
- Description:
- IC REG BST CHRG PUMP ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,226
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Product details
Overview
LT3579EFE-1#TRPBF from Analog Devices is a dual-phase capable 6A, 42V monolithic boost/inverting DC/DC converter with integrated master (3.4A) and slave (2.6A) NPN switches, fault protection (output short, input overvoltage, overtemperature), and 200kHz–2.5MHz programmable switching frequency. It delivers 12V at 1.7A or –12V at 1.2A from 5V input and supports SEPIC, flyback, and high-efficiency charge-pump topologies in automotive ECU and TFT-LCD bias supplies.
For engineers reviewing the LT3579EFE-1#TRPBF datasheet, LT3579EFE-1#TRPBF pinout, LT3579EFE-1#TRPBF application, or LT3579EFE-1#TRPBF equivalent, key selection criteria include its dual-phase synchronization capability via CLKOUT (180° out-of-phase, 50% duty cycle), master/slave current sharing ratio (0.78 A/A), 2.5V–16V input range with 40V transient tolerance, and TSSOP-20 package with exposed GND pad for thermal management.
Technical Context
The LT3579EFE-1#TRPBF implements constant-frequency current-mode control with integrated error amplifier (70 V/V gain, 250 µmhos transconductance), frequency foldback (1/6 normal fOSC), and soft-start (250 kΩ internal ramp, 5.7–11.3 µA charge/discharge current). Its dual-phase architecture enables interleaved operation when synchronized with another LT3579-1 device via SYNC/CLKOUT, reducing input/output ripple and EMI.
It features bidirectional FAULT pin logic (750–1050 mV thresholds), high-gain SHDN pin (1.24–1.41 V turn-on hysteresis), and temperature-compensated CLKOUT (duty cycle linear vs. junction temp). The GATE pin drives external PMOS for output disconnect during faults, with pull-down current scaling linearly from 0 to 933 µA as SS voltage rises above 500 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Configuration | Dual NPN: master (3.4A min) + slave (2.6A min); combined 6A peak current limit for robust high-power conversion |
| Input Voltage Range | 2.5V to 16V operating, 40V max transient - supports wide automotive and industrial supply rails |
| Switching Frequency | 200kHz to 2.5MHz (RT-programmable or external SYNC) - enables compact magnetics and noise-sensitive layout |
| Feedback Reference | 1.215V (positive) / 9mV (negative) - precise regulation for boost and inverting topologies |
| Quiescent Current | 2.4mA typical (active), 1µA max (shutdown) - low power loss in standby and battery-backed systems |
| Thermal Protection | Overtemperature shutdown at 165°C (typical) - safeguards against sustained overload without external sensing |
| Package | 20-lead TSSOP with exposed GND pad (θJA = 38°C/W) - validated for high-power dissipation in space-constrained PCBs |
Pinout & Package
LT3579EFE-1#TRPBF is housed in a 20-lead plastic TSSOP package (FE) with exposed GND pad (Pin 21) that must be soldered to the PCB for thermal and electrical integrity. Pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 20) | Positive/Negative Feedback Input | Accepts 1.215V reference for boost or 9mV for inverting mode; bias current 83.3µA enables single-resistor output setting |
| VC (Pin 19) | Error Amplifier Output | Drives external compensation network (type II/III) to stabilize loop response across load/line variations |
| GATE (Pin 1) | PMOS Gate Drive Output | Sinks up to 933µA to control external PMOS for output disconnect during fault; impedance drops to 2kΩ when SS > 500mV and VGATE < 2V |
| FAULT (Pin 2) | Bidirectional Fault Indicator | Active-low open-collector; pulled low internally on overcurrent/overvoltage/overtemp; requires external 100kΩ pull-up |
| VIN (Pin 3) | Main Input Supply | 2.5V–16V input rail; must be locally bypassed with low-ESR capacitor to suppress switching noise |
| SW1 (Pins 4–7) | Master Switch Collector | Handles ≥3.4A peak current; minimize trace area to reduce EMI coupling into sensitive analog circuitry |
| GND (Pins 8,9,21) | Power & Signal Ground | Exposed pad (Pin 21) is primary thermal path; must be solid-soldered to inner ground plane for θJA = 38°C/W |
| SW2 (Pins 10–13) | Slave Switch Collector | Handles ≥2.6A peak current; shares same 42V rating as SW1; tied to SW1 for combined 6A operation |
| CLKOUT (Pin 14) | Synchronization Clock Output | 180° out-of-phase, ~50% duty cycle signal; synchronizes other LT3579-1 devices for interleaved dual-phase operation |
| SHDN (Pin 15) | Shutdown Control Input | High-gain comparator with 30mV hysteresis; 1.33V typical enable threshold; accepts slow-ramping control signals |
| RT (Pin 16) | Frequency Programming Input | Resistor-to-ground sets fOSC from 200kHz (432kΩ) to 2.5MHz (34kΩ); no floating allowed |
| SYNC (Pin 17) | External Clock Input | Accepts 0.4V–1.3V logic levels; overrides RT setting; reverts to internal oscillator when driven < 0.4V |
| SS (Pin 18) | Soft-Start Timing Node | Charged by 250kΩ internal resistor; controls ramp rate of switch current and GATE drive to limit inrush |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase synchronization | CLKOUT provides 180° phase-shifted, fixed 50% duty cycle clock enabling interleaved operation with second LT3579-1 for reduced ripple and EMI |
| Integrated fault protection | Detects and responds to output short, VIN overvoltage (>16.2V), SW overvoltage (>42V), and die overtemperature (>165°C) without external components |
| Configurable undervoltage lockout | SHDN pin supports user-defined UVLO using resistor divider; internal UVLO disables chip below 2.3V VIN for robust brownout recovery |
| Output disconnect via external PMOS | GATE pin drives external PMOS with linear current ramp (0–933µA) tied to SS voltage, enabling controlled hot-plug and fault isolation |
| Wide switching frequency range | 200kHz–2.5MHz operation allows optimization for size (high-f), efficiency (mid-f), or EMI compliance (low-f) across diverse applications |
Applications
| Automotive Engine Control Unit (ECU) Power | TFT-LCD Bias Supplies |
|---|---|
Use Scenario: Generating stable 12V/–12V rails from noisy 12V vehicle battery for microcontroller, sensor, and CAN interface circuitry. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, regulated bias voltages with fault immunity against load dumps and cold-crank conditions. Use Value: 40V transient tolerance and overvoltage lockout (16.2V min) prevent damage during alternator load dump; dual-phase sync reduces EMI in safety-critical ECU modules. |
Use Scenario: Supplying high-voltage positive (VON) and negative (VOFF) bias to TFT panel gate drivers in industrial displays. IC Role / Device Role / Timing Role: Inverting converter generating –12V at 1.2A from 5V logic rail; configured with external PMOS for rapid output disconnect during panel power sequencing. Use Value: Negative feedback reference (9mV) enables precise low-voltage regulation; GATE-driven PMOS ensures clean power-up/down transitions without panel flicker or latch-up. |
| Vacuum Fluorescent Display (VFD) Bias Supplies | Local Power Supply for Industrial Sensors |
Use Scenario: Delivering 20–30V anode supply and –10V grid bias for VFD segments in point-of-sale terminals and instrumentation panels. IC Role / Device Role / Timing Role: Boost converter operating at 1MHz (RT = 86.6kΩ) to minimize inductor size; uses charge-pump topology for higher output voltage with fewer components. Use Value: 42V switch rating and 6A combined current support multi-segment VFD drive; frequency foldback improves start-up control under heavy capacitive loads. |
Use Scenario: Providing isolated 5V/3.3V rails from 24V industrial bus for analog front-end sensors and ADCs in harsh factory environments. IC Role / Device Role / Timing Role: SEPIC converter maintaining regulation during 24V bus dips to 9V; employs dual-phase sync with second LT3579-1 to halve input ripple current. Use Value: 2.5V minimum input enables operation during brownouts; master/slave current sharing (0.78 A/A) ensures balanced thermal loading across two converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EFE#TRPBF | Single-channel synchronous buck controller (no integrated switches); supports 4–60V input, 0.8V–24V output; requires external MOSFETs | Used where higher efficiency (>95%) and adjustable output voltage are required; lacks integrated fault protection and dual-phase sync | Select LTC3891EFE#TRPBF when designing high-current buck supplies with external FETs and need programmable VOUT; not drop-in for LT3579EFE-1#TRPBF's boost/inverting roles |
| LT3582EFE#TRPBF | Single-switch 4A, 40V boost/inverting converter; no slave switch or dual-phase capability; 200kHz–2MHz fOSC; same TSSOP-20 package | Lower current capacity (4A vs. 6A); missing CLKOUT phase inversion and SW2 current sharing; suitable for cost-sensitive, lower-power designs | Select LT3582EFE#TRPBF when 4A peak current suffices and dual-phase sync is unnecessary; pin-compatible but functionally limited replacement |
Compared with LTC3891EFE#TRPBF and LT3582EFE#TRPBF, the LT3579EFE-1#TRPBF uniquely integrates dual NPN switches with 6A combined current, 180° CLKOUT for interleaving, and comprehensive fault protection - making it optimal for space-constrained, high-reliability boost/inverting supplies where component count and robustness are critical.
Availability
LT3579EFE-1#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, TFT-LCD bias supplies, VFD driver circuits, and industrial sensor local power requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 125°C.
Supply support for LT3579EFE-1#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 precision instrumentation, industrial automation, communications, and automotive markets.
The LT3579 product line delivers monolithic DC/DC converters with integrated fault protection and flexible topology support, designed specifically for robust local power generation in automotive, display, and industrial systems where reliability and design simplicity are paramount.
FAQ
What is the difference between LT3579EFE-1#TRPBF and LT3579EFE#TRPBF?
The LT3579EFE-1#TRPBF includes dual-phase synchronization capability via its CLKOUT pin, which outputs a 180° out-of-phase, ~50% duty cycle signal to coordinate with a second LT3579-1 device. The LT3579EFE#TRPBF lacks this feature and provides standard in-phase CLKOUT. Both share identical switching specs, fault protection, and pinout, but only the -1 variant enables interleaved operation for reduced ripple and EMI.
Can LT3579EFE-1#TRPBF be used in a flyback configuration?
Yes, LT3579EFE-1#TRPBF supports flyback topology using its master and slave switches. The datasheet confirms configurable operation in flyback mode, leveraging the 42V-rated SW1/SW2 pins and internal current-mode control. External transformer turns ratio and snubber design must accommodate the 6A combined current limit and 42V breakdown rating to ensure safe operation.
What is the purpose of the GATE pin on LT3579EFE-1#TRPBF?
The GATE pin on LT3579EFE-1#TRPBF sinks current (up to 933 µA) to drive the gate of an external PMOS transistor, enabling output disconnect during FAULT events. Its current scales linearly with SS pin voltage, allowing controlled turn-on during soft-start and fast turn-off during faults - critical for protecting downstream loads in automotive and display applications.
Does LT3579EFE-1#TRPBF require external compensation?
Yes, LT3579EFE-1#TRPBF requires external compensation connected to the VC pin. The error amplifier output (VC) interfaces with a type II or type III network (resistor + capacitor + optional zero) to stabilize the control loop. Compensation values depend on selected topology, inductor, output capacitor, and load; Analog Devices' LTpowerCAD tool provides validated designs.
How does the FAULT pin behave during overtemperature events?
During overtemperature events (>165°C junction), the FAULT pin on LT3579EFE-1#TRPBF is actively pulled low by internal circuitry, disabling all switches, turning GATE high-impedance, and disabling CLKOUT. The SS pin initiates a timeout sequence (charge to 1.8V then discharge to 50mV) before automatic recovery - ensuring thermal stress relief without manual reset.
LT3579EFE-1#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-1#TRPBF FAQ
1.How can I place an order for LT3579EFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3579EFE-1#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-1#TRPBF reliable?
The price and inventory of LT3579EFE-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3579EFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3579EFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3579EFE-1#TRPBF?
LT3579EFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3579EFE-1#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-1#TRPBF?
For technical support, including LT3579EFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3579EFE-1#TRPBF requirements.
6.How does Aetrix verify that LT3579EFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3579EFE-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3579EFE-1#TRPBF?
All LT3579EFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3579EFE-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3579EFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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