My Inquiry
My Account
Analog Devices Inc. LT3513IUHF#PBF
- Part No.:
- LT3513IUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LT3513IUHF#PBF.pdf
- Description:
- IC REG CONV TFT LCD 5OUT 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,584
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3513IUHF#PBF from Analog Devices (formerly Linear Technology) is a 5-output, 38-pin QFN switching regulator IC designed for TFT-LCD panel power management. It integrates a 2.2A buck converter (VLOGIC), 1.5A boost (AVDD), two 0.25A boost/inverter regulators (VON, VOFF), and an external NPN LDO driver - all operating from 4.5V to 30V input. It delivers precise, sequenced, and fault-protected power to logic and display bias rails in large-format LCDs.
For engineers reviewing the LT3513IUHF#PBF datasheet, LT3513IUHF#PBF pinout, LT3513IUHF#PBF application, or LT3513IUHF#PBF equivalent, key selection considerations include its 2MHz fixed-frequency operation, PanelProtect™ VON fault disable, integrated current-mode control per output, CT-programmable VON delay, and thermal performance in the 5mm × 7mm QFN package with exposed pad.
Technical Context
The LT3513IUHF#PBF implements four independent current-mode switching regulators sharing a master 2MHz oscillator and reference. Switcher 1 (buck) uses inductor current sense for stable operation across wide VIN–VOUT ratios; switchers 2–4 use slave oscillators with foldback frequency reduction below 0.75V FB. Each employs slope compensation above 50% duty cycle and features dedicated soft-start pins (RUN-SS1/2/3/4) and VC compensation nodes.
PanelProtect™ circuitry monitors all four main outputs (VLOGIC, AVDD, E3/VON, VOFF); if any drops >10% below regulation, it pulls CT low to disable the VON PNP. The CT pin is charged by a 20µA source only after all FB pins reach ≥1.125V, enabling programmable VON turn-on delay via external capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 30V - supports automotive and industrial DC bus inputs without pre-regulation. |
| Buck Output (VLOGIC) | Up to 1.2A at 3.3V or 5V - supplies system logic with inductor current sensing for accurate peak-current limiting. |
| Boost Output (AVDD) | Up to 1.5A - generates 8V–15V panel supply with FB2 feedback and PGOOD monitoring. |
| VON Output | Up to 30mA with programmable delay - high-side PNP-driven positive gate voltage for LCD source drivers, disabled on fault. |
| VOFF Output | Negative inverter output - provides –10V bias using internal Schottky (D4) and NFB4 feedback. |
| Switching Frequency | 1.9–2.22MHz (typical 2MHz) - enables compact magnetics and low-noise operation in display timing-critical systems. |
| Operating Temperature | –40°C to +125°C junction - qualified for automotive TFT-LCD displays and industrial monitors. |
Pinout & Package
LT3513IUHF#PBF is housed in a thermally enhanced 38-lead 5mm × 7mm plastic QFN package (UHF) 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) via resistor divider; 1.235V reference ensures tight regulation. |
| SW1 (Pins 34,35) | Buck switch emitter | Connects to inductor/catch diode/BOOST cap; dual pins reduce resistance and improve thermal path. |
| VC1 (Pin 2) | Buck error amplifier compensation | RC network here stabilizes loop response and prevents oscillation under load transients. |
| PGOOD (Pin 11) | AVDD power-good open-collector output | Pulls low when AVDD reaches ≥90% of target - enables external P-MOSFET disconnect for safety. |
| VON_CLK (Pin 10) | VON enable/disable control | High = disables VON and activates VONSINK sink; low = enables VON and places VONSINK in high-Z state. |
| CT (Pin 13) | VON delay timing capacitor input | Charged by 20µA source after all outputs stabilize; time to 1.1V sets VON turn-on delay (C = 20µA·t/1.1V). |
| E3 (Pin 7) | VON output node / PNP emitter | Provides VON rail; also serves as emitter connection for internal high-side PNP switch driving VON. |
| BD (Pin 26) | External NPN base drive | Drives base of external transistor for secondary LDO; 6–10mA drive capability supports low-dropout logic rails. |
Key Features
| Feature | Design Value |
|---|---|
| Four integrated switching regulators | 2.2A buck (VLOGIC), 1.5A boost (AVDD), 0.25A boost (VON), 0.25A inverter (VOFF) - eliminates need for discrete DC/DC stages. |
| PanelProtect™ fault protection | Disables VON if any of VLOGIC/AVDD/E3/VOFF falls >10% below regulation - prevents LCD panel damage during rail faults. |
| Programmable VON delay | CT pin allows precise sequencing: VON turns on only after all other outputs stabilize - avoids panel latch-up. |
| Inductor current sense (buck) | Measures current directly in series with inductor - avoids minimum-on-time limitation and ensures robust current limiting at low VOUT/VIN ratios. |
| Thermally optimized QFN | 38-lead 5mm × 7mm package with exposed GND pad - 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. IC Role / Device Role / Timing Role: Central multi-rail power manager generating VLOGIC (5V), AVDD (12V), VON (22V), VOFF (–10V) with fault-aware sequencing. Use Value: PanelProtect™ ensures VON shutdown during AVDD brownout - preventing irreversible gate oxide stress on LCD driver ICs. | Use Scenario: Supplying 24-inch+ desktop monitor requiring independent, low-noise bias rails. IC Role / Device Role / Timing Role: Single-chip solution delivering sequenced 5V logic, 8V AVDD, 22V VON, and –10V VOFF with 2MHz switching to minimize filter size. Use Value: Integrated Schottky diodes (D4, BOOST path) reduce BOM count and improve efficiency over discrete diode solutions. |
| Flat Panel Televisions | TFT-LCD Industrial Control Panels |
Use Scenario: Backlight and panel bias supply in 32–65 inch TVs with wide-input 12–24V DC distribution. IC Role / Device Role / Timing Role: Primary power IC managing VLOGIC, AVDD, VON, VOFF with RUN-SS pin-controlled startup ramp rates. Use Value: Four independent soft-start pins (RUN-SS1/2/3/4) allow custom ramp times per rail - eliminating inrush-induced voltage droop on shared input. | Use Scenario: Harsh-environment HMI panel requiring extended temperature operation and rail fault resilience. IC Role / Device Role / Timing Role: High-reliability power controller with –40°C to +125°C rating, UVLO programming, and thermal shutdown. Use Value: Exposed pad (Pin 39) soldered to PCB ground provides low-thermal-resistance path - sustaining full output current at 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output LCD bias applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3513EUHF#PBF | Same silicon, rated for 0°C to 125°C junction - not guaranteed over full –40°C range. | Suitable for commercial-grade monitors but not automotive or extended-temp industrial use. | Select LT3513IUHF#PBF when operation below 0°C is required or AEC-Q200 qualification is needed. |
| LT3514IUHF#PBF | Pin-compatible upgrade with higher VON current (50mA vs 30mA), improved efficiency, and tighter FB tolerance. | Enables larger-panel designs requiring higher VON drive; supports same PCB layout. | Choose LT3514IUHF#PBF for new designs needing higher reliability margin or future-proofing against panel scaling. |
Compared with LT3513EUHF#PBF, the LT3513IUHF#PBF guarantees full –40°C to +125°C operation, while LT3514IUHF#PBF offers enhanced VON drive and precision - making the latter ideal for next-gen panels where gate charge demands increase.
Availability
LT3513IUHF#PBF is available at Aetrix Electronics and suitable for automotive TFT-LCD displays, large desktop monitors, and flat-panel televisions requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3513IUHF#PBF 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.
The LT3513 product line was developed specifically for TFT-LCD panel power systems, integrating multiple regulated outputs, fault protection, and sequencing control into a single QFN package to replace discrete multi-IC solutions.
FAQ
What is the maximum output current capability of the VLOGIC buck regulator in LT3513IUHF#PBF?
The LT3513IUHF#PBF buck regulator (Switcher 1) delivers up to 1.2A continuous output current at VLOGIC (e.g., 5V or 3.3V), with a guaranteed minimum switch current limit of 2.2A. Its inductor current sense architecture maintains stable current limiting across all input-to-output voltage ratios, including low-VIN conditions where duty cycle approaches maximum.
How does the PanelProtect™ circuitry function in LT3513IUHF#PBF?
PanelProtect™ in the LT3513IUHF#PBF continuously monitors the regulation status of VLOGIC, AVDD, E3 (VON source), and VOFF. If any output falls more than 10% below its programmed voltage, the circuit pulls the CT pin low, immediately disabling the VON high-side PNP. This prevents unbalanced bias conditions that could damage LCD panel driver ICs or cause display artifacts.
Can LT3513IUHF#PBF generate a negative output voltage, and how is it implemented?
Yes, the LT3513IUHF#PBF generates a negative output (VOFF) using Switcher 4 - an inverting regulator with 0.25A current limit. It uses the NFB4 pin for feedback (reference = –1.18V), SW4 as the switch node, and D4 as the internal Schottky diode connected to ground. The inverter topology enables clean –10V generation without external diodes or transformers.
What is the role of the CT pin in LT3513IUHF#PBF, and how is its timing set?
The CT pin in LT3513IUHF#PBF controls the delayed turn-on of the VON output. After all four main outputs (VLOGIC, AVDD, E3, VOFF) reach ≥90% of regulation, a 20µA current source charges the external CT capacitor. When CT voltage reaches 1.1V, the internal PNP connects VON to E3. Delay time is calculated as t = (1.1V × C) / 20µA, allowing precise sequencing independent of other rails.
Is LT3513IUHF#PBF compatible with external NPN transistors for LDO functionality, and what are the drive requirements?
Yes, the LT3513IUHF#PBF includes an integrated LDO driver (BD pin) capable of supplying 6–10mA base current to an external NPN transistor. The LDOPWR pin can be tied to VIN or AVDD to optimize efficiency. The FB5 pin (0.625V reference) sets the LDO output voltage via a resistor divider, enabling a secondary low-noise logic rail such as 3.3V/0.5A.
LT3513IUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3513IUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3513IUHF#PBF 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#PBF reliable?
The price and inventory of LT3513IUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3513IUHF#PBF is usually 5 days.
3.What payment methods are accepted for LT3513IUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3513IUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3513IUHF#PBF?
LT3513IUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3513IUHF#PBF 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#PBF?
For technical support, including LT3513IUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3513IUHF#PBF requirements.
6.How does Aetrix verify that LT3513IUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LT3513IUHF#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3513IUHF#PBF?
All LT3513IUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3513IUHF#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3513IUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3513IUHF#PBF Tags
-
TPS51206DSQR
Texas Instruments
-
TPS51200DRCR
Texas Instruments
-
TPS51200DRCT
Texas Instruments
-
TPS62740DSSR
Texas Instruments
-
TPS51100DGQR
Texas Instruments
-
NCP51200MNTXG
onsemi
-
NCP51400MNTXG
onsemi
-
RT9026GSP
Richtek USA Inc.
-
LP2998MRX/NOPB
Texas Instruments
-
TPS51200QDRCRQ1
Texas Instruments
-
DPA423GN-TL
Power Integrations
-
LM10011SD/NOPB
Texas Instruments
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…
