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Analog Devices Inc. LT3513EUHF#TRPBF
- Part No.:
- LT3513EUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LT3513EUHF#TRPBF.pdf
- Description:
- IC REG CONV TFT LCD 5OUT 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,798
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Product details
Overview
LT3513EUHF#TRPBF from Analog Devices (formerly Linear Technology) is a 5-output, thermally enhanced switching regulator IC designed for TFT-LCD panel power management. It integrates a 2.2A buck converter (VLOGIC), dual 0.25A boost converters (AVDD, VON), a 0.25A inverting converter (VOFF), and an external NPN LDO driver - all operating from 4.5V to 30V input. Delivers precise, sequenced, and fault-protected outputs for large LCD displays.
For engineers reviewing the LT3513EUHF#TRPBF datasheet, LT3513EUHF#TRPBF pinout, LT3513EUHF#TRPBF application, or LT3513EUHF#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed output sequencing behavior, PanelProtect™ fault response, and real-world design meaning of key specs including CT-timed VON delay, inductor current sense, and four independent soft-start controls.
Technical Context
The LT3513EUHF#TRPBF implements fixed-frequency (1.9–2.22 MHz) current-mode control across four switching regulators: Switch 1 uses inductor current sense (SENSE+/SENSE−) for stable operation at any duty cycle; Switches 2–4 use slave oscillators with foldback frequency reduction below 0.75V feedback. All regulators share a master oscillator and reference but feature independent error amplifiers, compensation pins (VC1–VC4), and soft-start timing (RUN-SS1/2/3/4).
PanelProtect™ circuitry monitors AVDD, VON, E3, and VOFF simultaneously; if any drops >10% below regulation, it pulls CT low to disable VON via internal PNP disconnect. VON activation is delayed by a user-programmable CT capacitor (C = 20µA × tDELAY/1.1V), and its turn-on is gated by VON_CLK - enabling synchronized panel gate driving.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 30V - supports wide automotive and industrial supply rails without pre-regulation. |
| VLOGIC Output | Adjustable 3.3V or 5V up to 1.2A - powers logic circuitry with integrated 2.2A buck switch and BOOST pin for efficient saturation. |
| AVDD / VON / VOFF Outputs | Independent triple outputs: AVDD (boost, up to 80mA), VON (delayed boost, up to 30mA), VOFF (inverting, up to 20mA) - meets TFT-LCD bias voltage requirements. |
| Switch Current Limits | SW1: 2.2A min; SW2: 1.5A min; SW3/SW4: 0.25A min - guaranteed minimums enable reliable inductor selection and thermal margining. |
| Oscillator Frequency | 1.90–2.22 MHz (typical 2MHz) - enables compact magnetics and low EMI with fixed-frequency operation. |
| Operating Junction Temp | –40°C to 125°C - qualified for automotive TFT-LCD displays and industrial monitor environments. |
| Package | 38-lead 5mm × 7mm QFN with exposed pad - thermally enhanced for high-power density in space-constrained LCD backlights. |
Pinout & Package
LT3513EUHF#TRPBF is housed in a thermally enhanced 38-lead plastic QFN (5mm × 7mm) with exposed pad (Pin 39) soldered to PCB ground for electrical and thermal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (Pin 32) | VLOGIC feedback input | Sets buck output voltage (e.g., 5V = 1.235V × (1 + R1/R2)); bias current ≤200nA enables high-resistor-divider designs. |
| SW1 (Pins 34,35) | Buck switch emitter | Connects to inductor, catch diode, and BOOST capacitor; dual pins reduce trace inductance and improve thermal path. |
| SENSE+ / SENSE− (Pins 31,30) | Inductor current sense inputs | Enable true inductor-current-mode control - avoids minimum-on-time issues and ensures consistent current limiting across VIN/VOUT ratios. |
| RUN-SS1 (Pin 22) | VLOGIC soft-start control | 2µA current source charges external cap; 0.8V threshold initiates buck regulation - prevents inrush into downstream BIAS rail. |
| BIAS (Pins 18,29) | Internal circuitry power rail | Must be tied to VLOGIC ≥2.7V to enable SW2/SW3/SW4 and LDO driver - improves efficiency by reducing VIN current draw. |
| VON (Pin 8) | Delayed positive panel supply | Activated only after CT timer expires (programmed via Pin 13); disabled instantly if any output faults - critical for TFT gate driver sequencing. |
| PGOOD (Pin 11) | AVDD power-good open-collector | Pulls low when AVDD reaches ≥90% of setpoint - used with external P-MOSFET to disconnect AVDD during startup/fault. |
| CT (Pin 13) | VON delay timing capacitor input | 20µA current source charges external cap; 1.1V threshold triggers VON enable - enables precise, adjustable turn-on delay for display panel timing. |
Key Features
| Feature | Design Value |
|---|---|
| PanelProtect™ Fault Protection | Simultaneous monitoring of AVDD, VON, E3, and VOFF; immediate VON disable on any >10% undervoltage - prevents LCD panel latch-up or damage. |
| Four Independent Soft-Start Controls | RUN-SS1 (VLOGIC), RUN-SS2 (AVDD), RUN-SS3/4 (VON/VOFF) - enable programmable power-up sequencing to meet TFT-LCD timing requirements. |
| Inductor Current Sense (Buck) | SENSE+/SENSE− inputs eliminate switch-node sensing errors - ensures accurate peak-current limiting regardless of input/output voltage ratio. |
| Integrated Schottky Diodes | Three internal Schottkys (BOOST, D4, and SW3/SW4 paths) reduce BOM count and board area - eliminates need for external diodes in boost/inverter stages. |
| External NPN LDO Driver | BD (Pin 26) and LDOPWR (Pin 27) drive external NPN to generate secondary logic rail - extends flexibility beyond fixed internal outputs. |
Applications
| Automotive TFT-LCD Displays | Large TFT-LCD Desktop Monitors |
|---|---|
Use Scenario: Powering instrument cluster or infotainment display with strict sequencing and fault tolerance. IC Role / Device Role / Timing Role: Primary multi-rail power manager generating VLOGIC, AVDD, VON, VOFF with PanelProtect™-enforced VON delay and shutdown. Use Value: Prevents display artifacts or permanent damage during cold cranking (VIN dip) or overvoltage transients via real-time output monitoring and CT-gated VON enable. |
Use Scenario: Supplying bias voltages for 24-inch+ desktop LCD panels requiring independent, sequenced AVDD/VON/VOFF rails. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete DC/DC modules - delivers all panel supplies with programmable soft-start ramp rates and VON delay. Use Value: Reduces component count by integrating four switching regulators, three Schottky diodes, and sequencing logic - simplifies layout and improves reliability. |
| Flat Panel Televisions | TFT-LCD Industrial Control Panels |
Use Scenario: Generating panel bias for 4K UHD TV backlights with tight EMI and thermal constraints. IC Role / Device Role / Timing Role: High-frequency (2MHz) multi-output regulator minimizing inductor size while maintaining low noise via fixed-frequency current-mode control. Use Value: Enables use of small 4.7µH–10µH shielded inductors and reduces conducted EMI through predictable switching edge timing. |
Use Scenario: Powering ruggedized HMI displays in factory automation systems operating from 12–24V DC rails. IC Role / Device Role / Timing Role: Industrial-grade power IC with –40°C to 125°C junction rating and UVLO programmability via UVLO (Pin 38). Use Value: Ensures reliable startup and operation across wide temperature and input voltage ranges - no external supervision required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output LCD power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3514EUHF#TRPBF | Same pinout and architecture, but supports higher VON current (50mA vs 30mA) and includes internal VON_CLK oscillator - eliminates need for external clock source. | Preferred for next-gen panels requiring faster VON slew or tighter timing control without external clock generation. | Select LT3514EUHF#TRPBF when VON load exceeds 30mA or when board space prohibits external VON_CLK signal routing. |
| TPS65150RHBR | 3-output (AVDD/VON/VOFF) only; no integrated buck for VLOGIC; uses external FETs instead of internal bipolar switches - lower integration, higher external component count. | Suitable for cost-sensitive designs where VLOGIC is supplied separately and thermal budget allows discrete FETs. | Choose TPS65150RHBR only if VLOGIC is already available externally and design prioritizes TI ecosystem support over single-chip integration. |
Compared with LT3514EUHF#TRPBF, the LT3513EUHF#TRPBF offers proven 30mA VON drive with simpler clock interface, while TPS65150RHBR requires external MOSFETs and lacks integrated VLOGIC - making LT3513EUHF#TRPBF optimal for compact, fully integrated TFT-LCD power designs with moderate VON current demand.
Availability
LT3513EUHF#TRPBF is available at Aetrix Electronics and suitable for automotive TFT-LCD displays, large desktop monitors, and flat-panel televisions requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to 125°C operation.
Supply support for LT3513EUHF#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, automotive, and communications markets.
The LT3513EUHF#TRPBF belongs to Linear's TFT-LCD power management IC family, engineered specifically to replace discrete multi-rail solutions in display electronics - delivering integrated sequencing, fault protection, and thermal efficiency in a single QFN package.
FAQ
What is the maximum guaranteed VON output current for LT3513EUHF#TRPBF?
The LT3513EUHF#TRPBF guarantees a minimum VON output current of 30mA across the full –40°C to 125°C junction temperature range, with typical capability up to 50mA. This is specified under VE3 = 30V conditions and ensures reliable driving of TFT gate drivers without external buffering. The internal high-side PNP switch and PanelProtect™ circuitry maintain this rating even during transient faults.
How does the CT pin control VON timing in LT3513EUHF#TRPBF?
The CT pin (Pin 13) in LT3513EUHF#TRPBF receives a 20µA current source only after all four regulated outputs (VLOGIC, AVDD, VON, VOFF) reach ≥90% of their programmed values. The external capacitor connected to CT charges linearly; when voltage reaches 1.1V, the internal PNP connects VON to E3. Delay time is calculated as tDELAY = (1.1V × C) / 20µA - enabling precise, programmable turn-on for display panel sequencing.
Can LT3513EUHF#TRPBF operate without connecting the BIAS pins?
No - LT3513EUHF#TRPBF requires both BIAS pins (18 and 29) to be tied to VLOGIC (≥2.7V) for proper operation. Without BIAS voltage, Switches 2, 3, 4 and the NPN LDO driver remain disabled. The BIAS connection shifts internal bias current from VIN to VLOGIC, improving efficiency at high input voltages and enabling correct power-up sequencing. Leaving BIAS floating or unconnected prevents AVDD, VON, and VOFF from regulating.
What protection features does LT3513EUHF#TRPBF include for TFT-LCD panel safety?
LT3513EUHF#TRPBF incorporates PanelProtect™ - real-time monitoring of AVDD, VON, E3, and VOFF. If any output falls >10% below its setpoint, the CT pin is pulled low, immediately disabling VON. It also includes UVLO (Pin 38) with programmable hysteresis, overtemperature protection (TJ = 125°C shutdown), and individual current limits per switch (SW1: 2.2A, SW2: 1.5A, SW3/SW4: 0.25A). These ensure robust panel power integrity during fault conditions.
Is LT3513EUHF#TRPBF pin-compatible with other members of the LT3513 family?
Yes - LT3513EUHF#TRPBF shares identical pinout, package (38-lead 5mm × 7mm QFN), and electrical interface with LT3513IUHF#TRPBF and LT3513EUHF#PBF. The only differences are temperature grade (E-grade: 0°C to 125°C ambient, I-grade: –40°C to 125°C) and packaging (tape-and-reel vs. tray). All variants use the same PCB footprint, schematic symbols, and layout guidelines - enabling drop-in replacement within rated temperature limits.
LT3513EUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, TFT LCD
- Voltage - Input:
- 4.5V ~ 30V
- Number of Outputs:
- 5
- Voltage - Output:
- 0.8V ~ 40V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LT3513EUHF#TRPBF FAQ
1.How can I place an order for LT3513EUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3513EUHF#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 LT3513EUHF#TRPBF reliable?
The price and inventory of LT3513EUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3513EUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3513EUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3513EUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3513EUHF#TRPBF?
LT3513EUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3513EUHF#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 LT3513EUHF#TRPBF?
For technical support, including LT3513EUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3513EUHF#TRPBF requirements.
6.How does Aetrix verify that LT3513EUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3513EUHF#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 LT3513EUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3513EUHF#TRPBF?
All LT3513EUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3513EUHF#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 LT3513EUHF#TRPBF part is unused and in its original packaging.
Return procedure for LT3513EUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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