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Analog Devices Inc. LT3579IFE-1#TRPBF
- Part No.:
- LT3579IFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3579IFE-1#TRPBF.pdf
- Description:
- IC REG BST CHRG PUMP ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,063
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Product details
Overview
LT3579IFE-1#TRPBF from Analog Devices is a dual-phase capable 6A boost/inverting DC/DC converter with integrated 42V master and slave NPN switches (3.4A/2.6A), fault protection against output shorts, input overvoltage (>16.2V), and overtemperature (>165°C). It operates from 2.5V–16V input, delivers [email protected] or –[email protected] from 5V, and supports Boost/SEPIC/Inverting/Flyback topologies in automotive ECU and TFT-LCD bias supplies.
For engineers reviewing the LT3579IFE-1#TRPBF datasheet, LT3579IFE-1#TRPBF pinout, LT3579IFE-1#TRPBF application, or LT3579IFE-1#TRPBF equivalent, this page provides verified technical context, confirmed pin functions, validated dual-phase timing behavior, exact fault threshold values (750mV/1000mV), and real-world design meaning for soft-start ramp rate, CLKOUT phase inversion, and SW current sharing ratio.
Technical Context
The LT3579IFE-1#TRPBF implements constant-frequency current-mode control with dual-phase capability enabled via 180° phase-shifted CLKOUT output and fixed ~50% duty cycle-distinct from the standard LT3579's variable duty cycle. Its master/slave switch architecture allows combined 6A current limit with 0.78A/A current sharing ratio when tied together.
Internal fault detection triggers on five independent conditions: SW1 overcurrent (>3.4A), total switch overcurrent (>6A), VIN overvoltage (>16.2V), SW overvoltage (>42V), or junction temperature >165°C. Fault recovery uses a timed SS pin charge/discharge sequence (1.8V → 50mV) to enforce minimum off-time before restart.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Configuration | Dual-phase capable master/slave NPN switches (SW1: 3.4A min, SW2: 2.6A min) with 0.78A/A current sharing ratio when paralleled |
| Input Voltage Range | 2.5V–16V operating; 40V transient rating-supports wide automotive battery range including cold-crank and load-dump scenarios |
| Fault Detection Thresholds | VIN OVLO: 16.2V min; FAULT pin low threshold: 750mV max; high threshold: 1000mV min-enables precise external fault signaling |
| CLKOUT Behavior | 180° out-of-phase with internal oscillator; fixed ~50% duty cycle-enables true interleaved operation with second LT3579IFE-1#TRPBF |
| Soft-Start Control | SS pin charges from GND to ~2.1V via internal 250kΩ resistor; 50mV low-detection threshold ensures reliable fault timeout reset |
| Thermal Protection | Die temperature cutoff at 165°C (typical); junction temp exceeds 125°C during activation-requires thermal pad soldering per FE package spec |
| Switch Saturation | 250mV typical VCE(SAT) at 5.5A combined current-minimizes conduction loss in high-current boost paths |
Pinout & Package
LT3579IFE-1#TRPBF is packaged in a 20-lead plastic TSSOP (FE package) with exposed thermal pad (Pin 21) requiring PCB soldering for thermal management (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE (Pin 1 & 3) | PMOS gate drive output | Pull-down current source (max 933µA); enables external PMOS for output disconnect during fault-ramps linearly with SS voltage |
| FAULT (Pin 2 & 4) | Bidirectional fault indicator | Active-low open-collector; pulls low internally on fault or accepts external pull-down <750mV to force shutdown |
| VIN (Pin 3 & 5) | Main power input | 2.5V–16V supply input with 40V transient rating; requires local ceramic bypassing per layout guidelines |
| SW1 (Pins 4–7) | Master switch collector | Handles ≥3.4A peak current; connects to inductor in Boost/SEPIC or transformer primary in Flyback |
| GND (Pins 8,9,21) | Power and signal ground | Exposed pad (Pin 21) must be soldered to PCB ground plane for thermal and EMI performance |
| SW2 (Pins 10–13) | Slave switch collector | Handles ≥2.6A peak current; used in dual-phase or high-power charge-pump configurations |
| CLKOUT (Pin 14 & 16) | Synchronization clock output | 180° phase-inverted, ~50% duty cycle-enables interleaved operation with matched LT3579IFE-1#TRPBF |
| SHDN (Pin 15 & 17) | Enable/disable control | High-threshold enable (1.33V typ); 30mV hysteresis prevents false triggering on slow-rising inputs |
| RT (Pin 16 & 18) | Frequency setting | Resistor-to-ground sets switching frequency from 200kHz–2.5MHz; defines free-running clock when SYNC is inactive |
| SYNC (Pin 17 & 20) | External clock input | Accepts 0.4V–1.3V logic levels; overrides RT setting to synchronize multiple regulators |
| SS (Pin 18 & 19) | Soft-start timing | Charges to 2.1V for startup; discharges to 50mV during fault timeout-controls GATE ramp and switch enable timing |
| VC (Pin 19 & 2) | Error amplifier output | Connects to external compensation network (RC/CC); sets loop stability for feedback regulation |
| FB (Pin 20 & 1) | Feedback input | Accepts positive (1.215V ref) or negative (9mV ref) feedback-configurable for Boost, Inverting, SEPIC, or Flyback |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase synchronization | CLKOUT provides 180° phase shift and fixed 50% duty cycle-enables true interleaving with matched LT3579IFE-1#TRPBF for reduced input/output ripple |
| Output short-circuit protection | Sample Mode activates when FB deviates >3.7% from regulation; forces Q1/Q2 on every cycle to detect >3.4A SW1 current before damage occurs |
| Configurable undervoltage lockout | SHDN pin accepts resistor divider from VIN to set custom turn-on voltage (e.g., 9V UVLO using RUVLO1/RUVLO2 equations) |
| Integrated fault recovery timing | SS pin controls automatic fault timeout: charges to 1.8V then discharges to 50mV-ensures minimum off-time before retry without external circuitry |
| High-efficiency charge-pump topology support | Master/slave switch pairing enables high-voltage, high-power charge-pump designs with fewer components than traditional flyback solutions |
Applications
| Automotive Engine Control Unit (ECU) Power | TFT-LCD Bias Supplies |
|---|---|
Use Scenario: Generating stable 12V/–12V rails from 12V battery in engine bay under load-dump (40V) and cold-crank (2.5V) conditions. IC Role / Device Role / Timing Role: Dual-phase LT3579IFE-1#TRPBF acts as main boost/inverting regulator with fault-triggered PMOS disconnect to protect downstream MCU and sensors. Use Value: 40V transient rating and 165°C thermal cutoff prevent field failures; 180° CLKOUT phase enables two ICs to halve input capacitor RMS current. | Use Scenario: Providing ±15V bias for TFT-LCD source/gate drivers in industrial panel PCs with strict EMI limits. IC Role / Device Role / Timing Role: LT3579IFE-1#TRPBF configured in inverting mode delivers –15V; dual-phase sync reduces conducted noise at 1MHz switching frequency. Use Value: 250mV VCE(SAT) minimizes heat in sealed enclosures; Sample Mode detects display cable shorts before fuse blow. |
| Vacuum Fluorescent Display (VFD) Bias Supplies | Local Power Supply for Industrial Sensors |
Use Scenario: Generating 30V–60V anode supply for VFD tubes in point-of-sale terminals with hot-plug capability. IC Role / Device Role / Timing Role: LT3579IFE-1#TRPBF in charge-pump topology with external diodes; GATE pin soft-turns PMOS for inrush limiting during hot insertion. Use Value: SS-controlled GATE ramp (0–933µA) limits inrush to <1A; 42V switch rating supports 60V output with margin. | Use Scenario: Local 5V→12V boost for isolated analog sensor front-ends in factory automation systems with EMC requirements. IC Role / Device Role / Timing Role: LT3579IFE-1#TRPBF provides regulated 12V; synchronized CLKOUT clocks adjacent ADCs to avoid beat frequencies. Use Value: 200kHz–2.5MHz adjustable frequency avoids sensitive ISM bands; fault-locked shutdown prevents sensor data corruption during overvoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EUF#PBF | Single-channel synchronous buck controller; no integrated switches; requires external MOSFETs | Higher efficiency at >10A loads; lacks integrated fault protection and dual-phase sync | Select when designing >15A supplies with discrete FET optimization and external fault monitoring |
| LT8330EDD#TRPBF | Single-switch 6A boost converter; no slave switch or dual-phase capability; 40V switch rating | Smaller solution size; lacks SW2 for charge-pump or interleaved topologies | Select for cost-sensitive single-rail boost where dual-phase sync and fault-triggered disconnect are not required |
Compared with LTC3891EUF#PBF and LT8330EDD#TRPBF, the LT3579IFE-1#TRPBF uniquely integrates dual NPN switches with 180° phase-sync and five-fault detection-making it optimal for space-constrained, fault-critical dual-rail applications like automotive ECUs and industrial displays where discrete controllers add complexity and reliability risk.
Availability
LT3579IFE-1#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, TFT-LCD bias supplies, vacuum fluorescent display (VFD) bias, and industrial sensor local power supply applications requiring stable component supply across extended temperature ranges.
Supply support for LT3579IFE-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, and automotive markets since 1965.
The LT3579IFE-1#TRPBF belongs to Analog Devices' Power by Linear™ family of robust DC/DC converters designed specifically for fault-tolerant, high-reliability power conversion in automotive, industrial, and display applications where input transients, output shorts, and thermal stress are common.
FAQ
What distinguishes LT3579IFE-1#TRPBF from the standard LT3579?
The LT3579IFE-1#TRPBF features a dedicated dual-phase mode with 180° phase-shifted CLKOUT output and fixed ~50% duty cycle-unlike the standard LT3579's variable-duty-cycle CLKOUT. This enables true interleaved operation between two LT3579IFE-1#TRPBF units, reducing input/output ripple and EMI. The -1 suffix denotes this functional differentiation, confirmed in the Absolute Maximum Ratings and Typical Performance Characteristics sections of the official datasheet.
How does the LT3579IFE-1#TRPBF implement output short-circuit protection?
The LT3579IFE-1#TRPBF uses Sample Mode: when FB voltage falls outside regulation (e.g., <45mV in inverting mode), 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), the FAULT pin pulls low, disabling switches and initiating SS pin timeout. This hardware-based detection occurs within microseconds-no software or external comparators needed.
Can LT3579IFE-1#TRPBF operate in Flyback configuration?
Yes, the LT3579IFE-1#TRPBF supports Flyback topology using SW1 as the primary-side switch with an optocoupler feedback loop connected to the FB pin. The datasheet's Block Diagram and Applications Information section explicitly list Flyback as a supported configuration. For isolation compliance, use the negative FB reference (9mV) and ensure transformer turns ratio satisfies VOUT = VREF × (NS/NP) × (1–D)/D.
What is the purpose of the GATE pin on LT3579IFE-1#TRPBF?
The GATE pin on LT3579IFE-1#TRPBF is a programmable pull-down current source (0–933µA) that drives the gate of an external PMOS transistor. During normal operation, it remains high-impedance; during fault, it pulls the PMOS gate low to disconnect VIN from VOUT. Its current ramps linearly with SS voltage-enabling soft turn-on for hot-plug safety and inrush limiting, as detailed in the PIN FUNCTIONS section.
Does LT3579IFE-1#TRPBF require external compensation components?
Yes, the LT3579IFE-1#TRPBF requires external RC/CC network connected to the VC pin for loop compensation. The error amplifier output (VC) drives this network to stabilize the feedback loop across all operating conditions. Datasheet Figure 6 and the Applications Information section provide design equations and typical values (e.g., 8kΩ + 2.2nF) based on selected output capacitance and load step response requirements.
LT3579IFE-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
LT3579IFE-1#TRPBF FAQ
1.How can I place an order for LT3579IFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3579IFE-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 LT3579IFE-1#TRPBF reliable?
The price and inventory of LT3579IFE-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 LT3579IFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3579IFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3579IFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3579IFE-1#TRPBF?
LT3579IFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3579IFE-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 LT3579IFE-1#TRPBF?
For technical support, including LT3579IFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3579IFE-1#TRPBF requirements.
6.How does Aetrix verify that LT3579IFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3579IFE-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 LT3579IFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3579IFE-1#TRPBF?
All LT3579IFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3579IFE-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 LT3579IFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3579IFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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