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Analog Devices Inc. LT3513IUHF#TRPBF
- Part No.:
- LT3513IUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LT3513IUHF#TRPBF.pdf
- Description:
- IC REG CONV TFT LCD 5OUT 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,803
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Product details
Overview
LT3513IUHF#TRPBF from Analog Devices (formerly Linear Technology) is a 38-pin, 5mm × 7mm QFN integrated power management IC for TFT-LCD panel supplies. It delivers five regulated outputs - 1.2A step-down VLOGIC, 1.5A boost AVDD, 0.25A boost VON, 0.25A inverting VOFF, and an external NPN-driven secondary logic supply - across a 4.5V–30V input range. It is used in automotive and desktop LCD displays requiring precise sequencing and PanelProtect™ fault management.
For engineers reviewing the LT3513IUHF#TRPBF datasheet, LT3513IUHF#TRPBF pinout, LT3513IUHF#TRPBF application, or LT3513IUHF#TRPBF equivalent, key selection considerations include its four-integrated-switch architecture (2.2A buck / 1.5A boost / 0.25A boost / 0.25A inverter), thermally enhanced QFN package with exposed pad, fixed 2MHz switching frequency, and independent soft-start timing per output.
Technical Context
The LT3513IUHF#TRPBF integrates four current-mode switching regulators sharing a master 2MHz oscillator, with Switch 1 (buck) using inductor current sense and the others employing slave oscillators with foldback frequency control below 0.75V feedback. Each regulator features independent soft-start via RUN-SS pins and internal slope compensation for stability above 50% duty cycle.
PanelProtect™ circuitry disables VON if any of the four primary outputs drops >10% below regulation; VON activation is delayed by a CT-timed ramp after all outputs reach 90% of target. The BIAS pin enables high-efficiency operation by powering SW2/SW3/SW4 drivers and the LDO base drive from VLOGIC instead of VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 30V - supports wide automotive and industrial DC bus inputs without pre-regulation. |
| VLOGIC Output | Up to 1.2A at 3.3V or 5V - powers main logic circuits with buck topology and inductor current sensing. |
| AVDD Output | Up to 1.5A boost output - generates positive high-voltage panel supply (e.g., +8V to +13V) with dedicated FB2 feedback. |
| VON / VOFF Outputs | 0.25A boost (VON) and 0.25A inverting (VOFF) - provide gate-on and gate-off voltages for TFT-LCD source drivers. |
| Switching Frequency | Fixed 2MHz (±12%) - enables compact magnetics and low EMI in space-constrained display modules. |
| Operating Temperature | –40°C to +125°C junction - qualified for automotive TFT-LCD and industrial monitor applications. |
| Package | 38-lead 5mm × 7mm QFN with exposed thermal pad - provides low θJC (1°C/W) for high-power density thermal management. |
Pinout & Package
LT3513IUHF#TRPBF uses a thermally enhanced 38-lead plastic QFN (UHF package), 5mm × 7mm footprint, 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 VLOGIC output voltage (e.g., 3.3V/5V) via resistor divider; 1.235V reference ensures ±1.5% regulation accuracy. |
| SW1 (Pins 34,35) | Buck Switch Emitter Node | Connects to inductor, catch diode, and BOOST capacitor; dual pins reduce resistance and improve thermal path for 2.2A switch. |
| RUN-SS1 (Pin 22) | VLOGIC Soft-Start Control | 2µA current source charges external capacitor; 0.8V threshold initiates buck regulator startup and enables BIAS rail. |
| BIAS (Pins 18,29) | Internal Circuit Power Rail | Must be tied to VLOGIC ≥2.7V to enable SW2/SW3/SW4 and LDO driver; reduces quiescent current at high VIN. |
| VON (Pin 8) | Delayed Gate-On Output | Activated only after CT timer expires and all four outputs reach 90% regulation - prevents premature LCD gate turn-on. |
| PGOOD (Pin 11) | AVDD Power-Good Signal | Open-collector output pulled low when AVDD reaches 90% of setpoint - enables external P-MOSFET disconnect for safe sequencing. |
| CT (Pin 13) | VON Delay Timing Input | 20µA current charges external capacitor; 1.1V threshold triggers VON connection - programmable delay up to ~100ms. |
| E3 (Pin 7) | VON Output Emitter Node | Emitter of internal high-side PNP; connects to VON output capacitor and feedback divider - handles up to 30mA load. |
Key Features
| Feature | Design Value |
|---|---|
| Four Integrated Switches | 2.2A buck (SW1), 1.5A boost (SW2), 0.25A boost (SW3), 0.25A inverter (SW4) - eliminates need for four discrete controllers and external MOSFETs. |
| PanelProtect™ Fault Management | Automatic VON disable if AVDD, VON, VOFF, or VLOGIC falls >10% - prevents LCD panel damage during overvoltage or undervoltage faults. |
| Independent Soft-Start Control | Three RUN-SS pins (1, 2, 3/4) allow staggered startup of VLOGIC → AVDD → VON/VOFF - avoids input inrush and output cross-coupling. |
| 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. |
| Thermally Optimized QFN | 38-lead 5mm × 7mm package with exposed GND pad (Pin 39) - achieves θJC = 1°C/W for reliable 125°C junction operation. |
Applications
| Automotive TFT-LCD Displays | Large TFT-LCD Desktop Monitors |
|---|---|
Use Scenario: Powering instrument cluster or infotainment display with strict EMI and thermal constraints in vehicle cabin. IC Role / Device Role / Timing Role: Central power manager generating VLOGIC, AVDD, VON, VOFF with controlled sequencing and fault protection. Use Value: Enables single-chip solution for full LCD bias supply, reducing BOM count and PCB area while meeting AEC-Q100 temperature requirements. | Use Scenario: Driving 24-inch+ desktop monitors requiring stable, low-noise, multi-rail panel supplies. IC Role / Device Role / Timing Role: Five-output regulator delivering sequenced 5V logic, +12V AVDD, +22V VON, –10V VOFF with soft-start and PGOOD handshaking. Use Value: Eliminates discrete DC/DC stages and external supervisors - simplifies design and improves startup reliability under varying line conditions. |
| Flat Panel Televisions | Industrial Human-Machine Interfaces |
Use Scenario: Powering 4K UHD TV panels where compactness and thermal performance are critical in slim bezel designs. IC Role / Device Role / Timing Role: High-density power IC providing all TFT gate driver rails with PanelProtect™-enabled fault isolation. Use Value: Reduces thermal hotspots via QFN thermal pad and avoids costly heatsinks - lowers system cost and improves long-term reliability. | Use Scenario: Embedded HMI panels in factory automation equipment operating in extended temperature environments. IC Role / Device Role / Timing Role: Robust multi-output regulator supporting –40°C to +125°C operation with UVLO programming and latch-off protection. Use Value: Ensures uninterrupted display operation during brownouts or transient load events - meets industrial IEC 61000-4 immunity requirements. |
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 |
|---|---|---|---|
| LTC3251EUF#TRPBF | Single 3-output charge-pump IC (no inductors); max 200mA per rail; no VON delay or PanelProtect™ | Suitable only for smaller panels (<7") with lower current demands and no high-side gate drive timing requirements | Select only for ultra-compact, low-power portable displays where inductor-free design outweighs current and sequencing limitations. |
| TPS65150RGER | 3-output (AVDD/VON/VOFF) with integrated LDO; no buck VLOGIC; 1.2MHz switching; no CT-based VON delay | Lacks independent logic supply generation and programmable VON timing - requires external buck for VLOGIC | Choose when VLOGIC is already available from another source and simpler 3-rail sequencing suffices for mid-size panels. |
Compared with LTC3251EUF#TRPBF and TPS65150RGER, the LT3513IUHF#TRPBF uniquely integrates a high-current buck regulator, four-switch topology, PanelProtect™ fault response, and programmable VON delay - making it the only option capable of standalone, fully sequenced, high-power TFT-LCD panel supply in a single QFN package.
Availability
LT3513IUHF#TRPBF is available at Aetrix Electronics and suitable for automotive TFT-LCD displays, large desktop monitors, flat panel televisions, and industrial HMIs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3513IUHF#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 automotive, industrial, communications, and consumer markets.
The LT3513 product line was designed specifically for TFT-LCD panel power systems, integrating multiple switching regulators, sequencing control, and fault protection into a single thermally optimized package for space- and reliability-constrained display applications.
FAQ
What is the maximum output current capability of the LT3513IUHF#TRPBF's VLOGIC buck regulator?
The LT3513IUHF#TRPBF's VLOGIC buck regulator delivers up to 1.2A continuous output current at 3.3V or 5V. Its 2.2A guaranteed minimum switch current limit (at 35% duty cycle), inductor current sensing, and thermal QFN package enable robust operation under full load across the –40°C to +125°C junction temperature range. Derating applies above 85°C ambient.
How does the LT3513IUHF#TRPBF implement VON delay and what pin controls it?
The LT3513IUHF#TRPBF implements VON delay using the CT (Pin 13) timing capacitor. After all four primary outputs (VLOGIC, AVDD, VON, VOFF) reach 90% of regulation, a 20µA internal current source charges the CT capacitor. When CT reaches 1.1V, the internal high-side PNP connects E3 to VON. This delay prevents premature gate turn-on and is fully programmable via capacitor value.
Can the LT3513IUHF#TRPBF operate with an input voltage below 4.5V?
No - the LT3513IUHF#TRPBF has a minimum specified input voltage of 4.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this violates the guaranteed specification; the internal UVLO circuit (1.25V threshold on Pin 38) will prevent startup, and the buck regulator's maximum 75% duty cycle limits practical operation well above 4.5V for typical VLOGIC outputs.
What is the role of the BIAS pin on the LT3513IUHF#TRPBF and how must it be connected?
The BIAS pin (Pins 18 and 29) on the LT3513IUHF#TRPBF supplies operating current to SW2, SW3, SW4 drivers and the LDO base drive circuit. It must be tied directly to the VLOGIC output (≥2.7V) to enable those functions. Connecting BIAS to VLOGIC instead of VIN reduces quiescent current and improves efficiency - both BIAS pins must be connected to the same VLOGIC node.
Does the LT3513IUHF#TRPBF include built-in protection features, and which outputs do they cover?
Yes - the LT3513IUHF#TRPBF includes PanelProtect™ circuitry that continuously monitors AVDD, VON, VOFF, and VLOGIC. If any output falls more than 10% below its programmed voltage, the CT pin is pulled low, disabling the VON output immediately. Additional protections include UVLO, thermal shutdown, and per-switch current limiting - all integrated without external components.
LT3513IUHF#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)
LT3513IUHF#TRPBF FAQ
1.How can I place an order for LT3513IUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3513IUHF#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 LT3513IUHF#TRPBF reliable?
The price and inventory of LT3513IUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3513IUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3513IUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3513IUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3513IUHF#TRPBF?
LT3513IUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3513IUHF#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 LT3513IUHF#TRPBF?
For technical support, including LT3513IUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3513IUHF#TRPBF requirements.
6.How does Aetrix verify that LT3513IUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3513IUHF#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 LT3513IUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3513IUHF#TRPBF?
All LT3513IUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3513IUHF#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 LT3513IUHF#TRPBF part is unused and in its original packaging.
Return procedure for LT3513IUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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