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Renesas EL7520AILZ-T13
- Part No.:
- EL7520AILZ-T13
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
EL7520AILZ-T13.pdf
- Description:
- IC REG CTRLR TFT 4OUT 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,412
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Product details
Overview
EL7520AILZ-T13 from Intersil is a 4-channel DC/DC controller for TFT-LCD panel power systems, integrating a 1MHz PWM boost controller (VBOOST), VON and VOFF LDO controllers, and a VLOGIC LDO controller. It operates from 3V to 5.5V input, supports programmable start-up sequencing with CDLY capacitor timing, and delivers fault-latched protection across all four outputs. It is used in notebook displays up to 16", LCD monitors ≥15", and industrial LCDs.
For engineers reviewing the EL7520AILZ-T13 datasheet, EL7520AILZ-T13 pinout, EL7520AILZ-T13 application, or EL7520AILZ-T13 equivalent, key selection criteria include its 20-pin 4×4 QFN package, -40°C to +85°C operating range, integrated soft-start and in-rush control, P/PI-mode boost regulation, and per-channel fault detection with latch-off behavior.
Technical Context
The EL7520AILZ-T13 implements a current-mode 1MHz fixed-frequency PWM boost controller with external N-channel FET drive (DRVB), ISIN/ISAD-based current sensing and limit programming, and CINT-selectable P-mode (fast transient) or PI-mode (tight load regulation) operation. Its three LDO controllers - VON (positive, 1.2V FB), VOFF (negative, 0.2V FB), and VLOGIC (positive, 1.2V FB) - each drive external pass transistors via open-drain base drivers (DRVP, DRVN, DRVL) with dedicated feedback pins (FBP, FBN, FBL) and fault comparators.
Start-up sequencing is fully integrated and capacitor-programmable via CDLY: EL7520A variant permanently enables VLOGIC upon VDD >2.5V, then sequences VOFF → delayed VBOOST → VON with configurable delays (tDEL1–tDEL3). Fault detection includes overtemperature (140°C), output undervoltage (e.g., VF_FBP = 1.0V trip), and latch-off until EN or VDD cycle - no auto-retry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3V to 5.5V - powers internal circuitry (VDD/VDDP) and supports common LCD system rails. |
| Oscillator Frequency | 900–1100 kHz - enables compact magnetics and ceramic capacitors in space-constrained panels. |
| VBOOST Reference | 1.187–1.238 V - sets regulated output voltage via external resistor divider on FBB pin. |
| VON Feedback Voltage | 1.177–1.233 V - defines positive high-voltage rail (e.g., +15V) using external PNP pass transistor. |
| VOFF Feedback Voltage | 0.171–0.235 V - defines negative rail (e.g., –5V) using external NPN pass transistor. |
| VLOGIC Feedback Voltage | 1.174–1.226 V - regulates logic supply (e.g., 2.5V) with up to 500mA load capability. |
| Fault Timeout | 50 ms - CDLY-programmable window after fault detection before latching off. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and commercial TFT-LCD environments. |
Pinout & Package
EL7520AILZ-T13 is housed in a 20-lead 4 mm × 4 mm × 0.9 mm QFN package with exposed thermal pad. Pin numbering follows top-view layout as defined in FN7318 Rev 0.00.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CDLY | Sequencing & fault timer | Capacitor-to-GND sets start-up delay, soft-start time, and fault timeout; critical for safe multi-rail ramp-up. |
| 2 DRVB | Boost gate driver output | Drives external N-channel FET gate; voltage follows VDDP (up to 36V max); requires low-inductance layout. |
| 3 PGND | Power ground return | Separate low-impedance path for high-current boost switch node; must be tied to thermal pad. |
| 4 ISAD | Current limit programming | Resistor-to-GND sets peak current limit threshold via internal 8kΩ reference; determines max IOUT capability. |
| 5 ISIN | Current sense input | Senses drain voltage of external N-FET during on-time; feeds internal current comparator for cycle-by-cycle limiting. |
| 6 DELB | Delayed VBOOST enable | Active-low open-drain output controlling external P-FET for delayed VBOOST; pulled high during fault. |
| 7 SGND | Signal ground reference | Low-noise analog ground for feedback pins (FBB/FBP/FBN/FBL), VREF, and CINT; must be isolated from PGND. |
| 8 FBB | Boost feedback input | Regulates VBOOST to 1.2V nominal; connects to resistor divider from VBOOST output. |
| 9 CINT | Boost integrator output | Connect to VREF for P-mode (fast transient) or 2.2nF-to-SGND for PI-mode (tight load regulation). |
| 10 VREF | Bandgap reference bypass | 1.215V internal reference; bypassed with 0.1µF to SGND; used as charge pump reference and mode select. |
| 11 FBN | VOFF feedback input | Regulates VOFF to 0.2V nominal; connects to resistor divider from VOFF output; fault trips at 0.4V falling. |
| 12 DRVN | VOFF base driver | Open-drain P-channel output driving NPN emitter; controls VOFF linear regulator pass transistor. |
| 13 FBL | VLOGIC feedback input | Regulates VLOGIC to 1.2V nominal; fault trips at 1.0V falling; supports up to 500mA load. |
| 14 DRVL | VLOGIC base driver | Open-drain N-channel output driving PNP base; provides up to 16mA sink current for logic LDO. |
| 15 FBP | VON feedback input | Regulates VON to 1.2V nominal; fault trips at 1.0V falling; supports high-voltage positive rail generation. |
| 16 DRVP | VON base driver | Open-drain N-channel output driving PNP base; provides up to 4mA sink current for VON LDO. |
| 17 EN | Enable input | Active-high digital control; device disabled below 0.8V, enabled above 2.2V; initiates full start-up sequence. |
| 18 VDD | Core supply input | Powers internal logic, references, and comparators; must be decoupled with 0.1µF to SGND. |
| 19 VDDP | Gate drive supply | Supplies DRVB output; rated up to 6.5V; separate from VDD to support higher gate drive voltage margins. |
| 20 PG | Fault protection gate | Open-drain P-channel output driving external PMOS for input protection; pulled high during fault or disable. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4-rail sequencing | Programmable CDLY-based timing ensures safe power-up order: VLOGIC → VOFF → delayed VBOOST → VON, preventing LCD panel damage. |
| P/PI-mode boost control | Selectable via CINT connection: P-mode prioritizes transient response for dynamic loads; PI-mode optimizes load regulation for stable bias rails. |
| Dedicated LDO controllers | Three independent transconductance amplifiers (GMP/GMN/GML) drive external pass transistors - enabling scalable VON (+15–36V), VOFF (–5––20V), and VLOGIC (1.3–VDD–0.2V) outputs. |
| Fault-latched protection | Per-channel undervoltage detection (VF_FBP/VF_FBN/VF_FBL), overtemperature (140°C), and latch-off behavior eliminate uncontrolled retries during fault conditions. |
| In-rush current control | PG-driven external PMOS (Q1) limits in-rush into VBOOST stage; DELB-controlled delayed VBOOST further reduces surge stress on downstream components. |
| Thermal-enhanced QFN | 20-lead 4×4 mm QFN with exposed thermal pad (θJC = 7.5°C/W) sustains continuous operation at full load in compact LCD bezels. |
Applications
| LCD Notebook Display Power | LCD Monitor Bias Supply |
|---|---|
Use Scenario: Powering 13.3"–16" notebook LCD panels requiring +15V (VON), –5V (VOFF), 2.5V (VLOGIC), and 11V (VBOOST) rails. IC Role / Device Role / Timing Role: Central 4-channel DC/DC controller managing synchronized start-up, fault isolation, and regulation of all panel bias supplies. Use Value: Eliminates discrete regulators and sequencers; reduces BOM count by ≥7 components while ensuring safe, repeatable power-up under varying input conditions. | Use Scenario: Supplying bias voltages for 15"–24" desktop LCD monitors with fast wake-from-sleep requirements. IC Role / Device Role / Timing Role: Generates and sequences VLOGIC (enabled first), VOFF, delayed VBOOST, and VON to prevent panel latch-up during cold start. Use Value: CDLY-programmable delays (tDEL1–tDEL3) allow tuning to match specific panel timing specs without firmware changes. |
| Industrial LCD Panel Supply | Medical Display Power System |
Use Scenario: Providing robust, temperature-stable bias rails for 10"–19" industrial HMIs operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Fault-latched protection prevents uncontrolled re-attempts during overtemperature or undervoltage events in sealed enclosures. Use Value: Overtemperature shutdown at 140°C and guaranteed operation to +85°C ambient ensure reliability in fanless, thermally constrained designs. | Use Scenario: Delivering fail-safe power to diagnostic-grade medical LCDs where supply integrity directly impacts patient data accuracy. IC Role / Device Role / Timing Role: Independent per-rail fault monitoring (VON/VOFF/VLOGIC/VBOOST) with latch-off enables deterministic system-level fault reporting. Use Value: No auto-retry behavior meets IEC 62304 Class C software safety requirements by preventing uncontrolled recovery after critical faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TFT-LCD power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL97645A | Single-chip 4-output solution with integrated FETs; higher integration but fixed output voltages; no external FET flexibility. | Targets smaller panels (<12") with lower current needs; lacks programmable sequencing and external boost FET control. | Choose ISL97645A only when board space is critical and output specs match pre-defined ranges; EL7520AILZ-T13 retains design flexibility for custom VON/VOFF scaling. |
| TPS65150RGER | TI device with integrated boost + dual LDOs; uses different sequencing architecture (I²C-configurable); no VOFF negative rail support. | Designed for RGB LED backlight + logic bias; not suitable for TFT row/column driver bias requiring negative VOFF. | Select TPS65150RGER only for LED-backlit systems needing logic + AVDD; EL7520AILZ-T13 remains required for full TFT column/row driver bias including VOFF. |
Compared with ISL97645A and TPS65150RGER, EL7520AILZ-T13 uniquely supports externally adjustable VON/VOFF/VLOGIC rails, programmable sequencing via CDLY, and discrete boost FET selection - making it the only option for high-voltage, high-reliability TFT-LCD panels demanding design flexibility and fault determinism.
Availability
EL7520AILZ-T13 is available at Aetrix Electronics and suitable for LCD notebook displays (up to 16"), industrial HMI panels, and medical diagnostic monitors requiring stable component supply across extended temperature and long product lifecycles.
Supply support for EL7520AILZ-T13 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
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, computing, and consumer applications.
The EL7520A product line was designed specifically for TFT-LCD panel power systems, delivering integrated multi-rail control, programmable sequencing, and robust fault protection in a compact QFN package.
FAQ
What is the key functional difference between EL7520AILZ-T13 and EL7520ILZ-T13?
The EL7520AILZ-T13 permanently enables VLOGIC as soon as VDD exceeds 2.5V, whereas EL7520ILZ-T13 sequences VLOGIC only after the third CDLY ramp. This makes EL7520AILZ-T13 suitable for systems requiring immediate logic power - such as panels with always-on display controllers. Both share identical pinout, package, and electrical specifications otherwise.
How does the EL7520AILZ-T13 implement fault protection and recovery?
The EL7520AILZ-T13 detects faults on all four outputs (VBOOST, VON, VOFF, VLOGIC) via dedicated feedback comparators, plus overtemperature (140°C). Upon fault detection, it latches off all outputs and pulls DELB and PG high. Recovery requires cycling EN or VDD - no automatic retry occurs, ensuring deterministic behavior critical for LCD panel reliability.
Can EL7520AILZ-T13 support VON outputs above +20V?
Yes - the EL7520AILZ-T13's VON LDO controller supports outputs up to +36V using an external PNP pass transistor and appropriate resistor divider on FBP. The 1.2V feedback reference and 4mA DRVP sink current enable stable regulation at high voltages, provided external components (e.g., Q3 in FN7318 Figure 27) are rated accordingly.
What is the role of the CINT pin on EL7520AILZ-T13, and how does it affect performance?
The CINT pin selects the boost controller's compensation mode: connecting CINT to VREF enables P-mode for faster transient response, while connecting a 2.2nF capacitor from CINT to SGND enables PI-mode for improved load regulation (0.1% vs. 3% variation). This choice directly impacts stability and ripple under dynamic load changes in the VBOOST rail.
Is EL7520AILZ-T13 RoHS compliant and lead-free?
Yes - EL7520AILZ-T13 is Pb-Free plus anneal (RoHS compliant), featuring 100% matte tin plate termination finish and compatible with both SnPb and Pb-free soldering processes. Its MSL rating meets or exceeds IPC/JEDEC J-STD-020 requirements for Pb-free peak reflow temperatures.
EL7520AILZ-T13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, TFT LCD
- Voltage - Input:
- 3V ~ 5.5V
- Number of Outputs:
- 4
- Voltage - Output:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
EL7520AILZ-T13 FAQ
1.How can I place an order for EL7520AILZ-T13 through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7520AILZ-T13 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 EL7520AILZ-T13 reliable?
The price and inventory of EL7520AILZ-T13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7520AILZ-T13 is usually 5 days.
3.What payment methods are accepted for EL7520AILZ-T13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7520AILZ-T13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7520AILZ-T13?
EL7520AILZ-T13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7520AILZ-T13 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 EL7520AILZ-T13?
For technical support, including EL7520AILZ-T13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7520AILZ-T13 requirements.
6.How does Aetrix verify that EL7520AILZ-T13 is sourced from the original manufacturer or authorized distributors?
All EL7520AILZ-T13 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 EL7520AILZ-T13 meets industry standards.
7.What is the process for return or replacement of EL7520AILZ-T13?
All EL7520AILZ-T13 units undergo pre-shipment inspection (PSI). If there is an issue with EL7520AILZ-T13, 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 EL7520AILZ-T13 part is unused and in its original packaging.
Return procedure for EL7520AILZ-T13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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