My Inquiry
My Account
Analog Devices Inc. LT3579IFE#TRPBF
- Part No.:
- LT3579IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3579IFE#TRPBF.pdf
- Description:
- IC REG BST CHRG PUMP ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,252
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3579IFE#TRPBF from Analog Devices is a 6A, 42V dual-switch PWM DC/DC converter IC supporting boost, inverting, SEPIC, and flyback topologies. It integrates master (3.4A) and slave (2.6A) NPN switches, output short-circuit protection, input overvoltage lockout (16.2V min), and thermal shutdown. It delivers 12V at 1.7A from 5V input and is used in automotive ECU power supplies and TFT-LCD bias generation.
For engineers reviewing the LT3579IFE#TRPBF datasheet, LT3579IFE#TRPBF pinout, LT3579IFE#TRPBF application, or LT3579IFE#TRPBF equivalent, key selection criteria include combined 6A current limit, fault-protected operation under output shorts or overtemperature, configurable UVLO via SHDN pin, and synchronization capability via CLKOUT/SYNC pins for multi-regulator systems.
Technical Context
The LT3579IFE#TRPBF employs constant-frequency current-mode control with integrated error amplifier (VC pin), ramp generator, and PWM comparator. Its dual NPN switch architecture enables flexible topology configuration while maintaining precise peak-current regulation through internal sense resistor and transconductance amplifier (250 µmhos).
Fault detection operates via five independent triggers: SW1/SW2 overcurrent (>3.4A / >6A total), VIN overvoltage (>16.2V), SW overvoltage (>42V), junction temperature >165°C, or external FAULT pull-down. Recovery uses SS pin–driven timeout sequencing with charge/discharge cycles between 50mV and 1.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Configuration | Dual NPN: master (3.4A min) + slave (2.6A min), combined 6A current limit with 0.78 A/A sharing ratio |
| Input Voltage Range | 2.5V to 16V operating; 40V transient rating - supports wide automotive and industrial supply rails |
| Feedback Reference | 1.215V ±15mV positive FB voltage - sets output regulation point for boost/SEPIC; 9mV for inverting mode |
| Switching Frequency | 200kHz–2.5MHz adjustable via RT resistor or external SYNC clock - enables EMI optimization and compact magnetics |
| VCE(SAT) | 250mV typical at 5.5A (SW1+SW2 tied) - minimizes conduction loss in high-current paths |
| Fault Response Time | Sample Mode activation when FB deviates >3.7% from regulation - enables fast short-circuit detection before thermal damage |
| Soft-Start Control | SS pin charges to 1.8V then 2.1V via internal 250kΩ resistor - controls inrush current ramp rate using external capacitor |
Pinout & Package
LT3579IFE#TRPBF is packaged in a 20-lead plastic TSSOP with exposed GND pad (Pin 21), rated for –40°C to 125°C operation. Thermal resistance θJA = 38°C/W ensures reliable power dissipation in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 20) | Positive/Negative Feedback Input | Accepts resistor divider from VOUT; 1.215V reference for boost/SEPIC, 9mV for inverting - determines output voltage accuracy and stability |
| VC (Pin 19) | Error Amplifier Output | Drives external compensation network (RC/CC); sets peak switch current via PWM comparator threshold |
| GATE (Pin 1) | PMOS Gate Drive Output | Sinks up to 933µA (linear with SS voltage) - controls external PMOS for output disconnect during fault events |
| FAULT (Pin 2) | Bidirectional Fault Indicator | Active-low open-drain; pulled low internally on fault or externally to disable regulator - initiates SS timeout sequence |
| VIN (Pin 3) | Main Input Supply | 2.5V–16V operating range; includes internal UVLO (2.3V typ) and overvoltage lockout (16.2V min) |
| SW1 (Pins 4–7) | Master Switch Collector | Handles ≥3.4A peak current; connects to inductor in boost/flyback or capacitor in charge-pump topologies |
| SW2 (Pins 10–13) | Slave Switch Collector | Handles ≥2.6A peak current; tied to SW1 for 6A operation or used independently in dual-phase configurations |
| CLKOUT (Pin 14) | Synchronization Clock Output | Drives compatible regulators at same frequency; duty cycle varies linearly with die temperature - serves as built-in thermal monitor |
| SHDN (Pin 15) | Shutdown/UVLO Control | Enables chip above 1.33V (typ); hysteresis prevents glitches; supports external resistor divider for custom UVLO threshold |
| RT (Pin 16) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency (200kHz–2.5MHz); overrides SYNC when floating |
| SYNC (Pin 17) | External Clock Input | Accepts 0.4V–1.3V logic levels; synchronizes switching to external source - eliminates beat frequencies in multi-rail systems |
| SS (Pin 18) | Soft-Start Timing | Charges to 1.8V (enable) then 2.1V (full operation); controls GATE current ramp and fault recovery timing |
| GND (Pins 8,9,21) | Power and Signal Ground | Exposed pad (Pin 21) must be soldered to PCB ground plane - critical for thermal performance and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Fault Protection | Detects and responds to output short, VIN overvoltage, SW overvoltage, overtemperature, and external FAULT assertion - eliminates need for discrete protection circuitry |
| Configurable UVLO | SHDN pin accepts resistor divider from VIN to set custom turn-on voltage - enables system-level brownout management without external supervisor |
| Multi-Topology Flexibility | Single IC supports boost, inverting, SEPIC, and flyback via external component reconfiguration - reduces BOM count across power design variants |
| CLKOUT Synchronization | Buffered oscillator output drives other regulators and provides temperature-proportional duty cycle - simplifies timing coordination and thermal monitoring |
| Sample Mode Short Detection | Forces Q1/Q2 on every cycle when FB is out of regulation - detects hard shorts within one switching period before current runaway |
| High-Gain SHDN Interface | Accepts slowly ramping or noisy enable signals with 30mV hysteresis - robust against supply sequencing delays and EMI-induced glitches |
Applications
| Automotive Engine Control Unit (ECU) Power | TFT-LCD Bias Supplies |
|---|---|
Use Scenario: Generating isolated 12V/1.7A and –12V/1.2A rails from 5V vehicle bus for microcontroller, sensor interface, and display driver ICs in engine bay environments. IC Role / Device Role / Timing Role: Primary DC/DC controller managing power conversion, fault response, and thermal safety in harsh automotive conditions. Use Value: 6A combined switch current and 42V breakdown withstand support stable operation despite load dump transients up to 40V. | Use Scenario: Providing high-voltage positive and negative bias rails (e.g., AVDD = +15V, VGL = –10V) for TFT gate drivers and source drivers in industrial panel displays. IC Role / Device Role / Timing Role: Dual-rail inverting/boost converter delivering regulated outputs with tight feedback accuracy (±1.2% ref) and fast transient response. Use Value: 1.215V FB reference and low 250mV VCE(SAT) ensure <1% output voltage drift across temperature and load. |
| Vacuum Fluorescent Display (VFD) Bias Supplies | Local Power Supply for Industrial Sensors |
Use Scenario: Generating 30–60V anode supply and –10V grid bias from 3.3V or 5V logic rail in instrumentation panels and point-of-sale terminals. IC Role / Device Role / Timing Role: High-voltage boost converter with programmable frequency (up to 2.5MHz) to minimize inductor size in space-constrained enclosures. Use Value: Adjustable RT-based frequency control allows EMI compliance in narrow bands while maintaining >90% efficiency at full load. | Use Scenario: Powering isolated analog front-ends, ADCs, and RS-485 transceivers in factory automation nodes where input voltage varies from 4.5V to 16V. IC Role / Device Role / Timing Role: Wide-input buck-boost capable regulator with undervoltage lockout and soft-start to prevent brownout resets during battery sag. Use Value: User-configurable SHDN-based UVLO ensures clean startup only when main supply exceeds system-defined minimum (e.g., 5.5V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller 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); lacks integrated fault protection and sample-mode short detection | Select when higher efficiency (>95%) and bidirectional power flow are required; not drop-in due to external FET dependency |
| LT8330EFE#TRPBF | Single-switch 5A boost controller; no slave switch or dual-phase capability; lower max VSW (60V vs 42V) | Smaller solution size; lacks output short-circuit protection and CLKOUT synchronization capability | Select for cost-sensitive, single-rail boost designs where fault tolerance is managed externally |
Compared with LTC3789EFE#TRPBF and LT8330EFE#TRPBF, the LT3579IFE#TRPBF uniquely integrates dual NPN switches with comprehensive fault protection, enabling simpler, more robust local power supplies without external protection ICs or supervisors.
Availability
LT3579IFE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, TFT-LCD bias supplies, VFD driver circuits, and industrial sensor node power requiring stable component supply across extended temperature ranges.
Supply support for LT3579IFE#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, and automotive markets.
The LT3579IFE#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters designed for fault-tolerant, high-reliability local power generation in demanding environments including automotive, industrial, and medical systems.
FAQ
What is the maximum combined switch current supported by the LT3579IFE#TRPBF?
The LT3579IFE#TRPBF supports a guaranteed minimum combined switch current of 6A when SW1 and SW2 are tied together, with typical performance reaching 7.5A and absolute maximum rating of 9.4A. This is achieved through coordinated current sharing (ISW2/ISW1 = 0.78 A/A) between its master (3.4A min) and slave (2.6A min) NPN switches, enabling high-power boost and inverting configurations without external current-sharing components.
How does the LT3579IFE#TRPBF protect against output short circuits?
The LT3579IFE#TRPBF protects against output short circuits using Sample Mode: when FB voltage falls outside regulation (e.g., <45mV for inverting or >1.17V for boost), it forces both SW1 and SW2 to turn on every switching cycle to sample inductor current. If sampled current exceeds 3.4A (SW1) or 6A (combined), it triggers FAULT1, pulling the FAULT pin low, disabling switches, and initiating SS pin–driven timeout recovery - all within one cycle to prevent thermal damage.
Can the LT3579IFE#TRPBF synchronize multiple DC/DC converters?
Yes, the LT3579IFE#TRPBF can synchronize multiple DC/DC converters using its CLKOUT pin, which outputs a buffered version of its internal oscillator or SYNC input signal. Other compatible regulators (including additional LT3579IFE#TRPBF units) can be synchronized to this clock, eliminating beat frequencies and reducing EMI in multi-rail systems. The LT3579-1 variant provides 180° phase-shifted CLKOUT for true dual-phase operation.
What package type and thermal characteristics does the LT3579IFE#TRPBF use?
The LT3579IFE#TRPBF uses a 20-lead plastic TSSOP package with exposed GND pad (Pin 21), rated for –40°C to 125°C operation. Its thermal resistance is θJA = 38°C/W and θJC = 10°C/W. The exposed pad must be soldered directly to the PCB ground plane to achieve specified thermal performance and ensure reliable operation at full 6A load in industrial and automotive environments.
Does the LT3579IFE#TRPBF support user-configurable undervoltage lockout?
Yes, the LT3579IFE#TRPBF supports user-configurable undervoltage lockout via its SHDN pin. By connecting a resistor divider from VIN to SHDN, designers can set a custom turn-on threshold using the formula RUVLO1 = ((VINUVLO – 1.33V)/1.33V) × RUVLO2. The internal SHDN comparator has 30mV hysteresis, and the part also includes fixed internal UVLO that disables operation below 2.3V (typical), providing dual-layer input supervision.
LT3579IFE#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
LT3579IFE#TRPBF FAQ
1.How can I place an order for LT3579IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3579IFE#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 LT3579IFE#TRPBF reliable?
The price and inventory of LT3579IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3579IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3579IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3579IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3579IFE#TRPBF?
LT3579IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3579IFE#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 LT3579IFE#TRPBF?
For technical support, including LT3579IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3579IFE#TRPBF requirements.
6.How does Aetrix verify that LT3579IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3579IFE#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 LT3579IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3579IFE#TRPBF?
All LT3579IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3579IFE#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 LT3579IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3579IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3579IFE#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
