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Renesas EL7520ILZ
- Part No.:
- EL7520ILZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
EL7520ILZ.pdf
- Description:
- IC REG CTRLR TFT 4OUT 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,460
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Product details
Overview
EL7520ILZ from Intersil is a 4-channel DC/DC controller for TFT-LCD power systems, integrating a 1 MHz PWM boost controller (VBOOST), and three LDO controllers for VON (+15 V), VOFF (−5 V), and VLOGIC (2.5 V). It operates from 3 V to 5.5 V input, features programmable start-up sequencing with CDLY-based timing, and delivers full fault protection including thermal shutdown and latch-off behavior on fault detection. It is used in notebook displays up to 16" and industrial LCD panels.
For engineers reviewing the EL7520ILZ datasheet, EL7520ILZ pinout, EL7520ILZ application, or EL7520ILZ equivalent, key selection criteria include its 20-lead 4×4 QFN package, −40°C to +85°C operating range, integrated soft-start and in-rush control, P/PI mode boost regulation, and discrete external FET drive architecture requiring careful layout of DRVB, ISIN, and ISAD signals.
Technical Context
The EL7520ILZ implements a current-mode 1 MHz fixed-frequency PWM boost controller with slope compensation, supporting both continuous and discontinuous conduction modes. Its feedback architecture uses dedicated reference pins (FBB at 1.205 V, FBP/FBL at 1.205 V, FBN at 0.203 V) and integrates transconductance amplifiers (GMP = 50 mS, GML = 200 mS) for LDO loop stability.
Start-up sequencing is controlled by CDLY capacitor timing, enabling six-phase ramp-based initialization: PG activation, VLOGIC/VBOOST soft-start (EL7520), VOFF delay (tDEL1 = 10 ms), delayed VBOOST via DELB, and final VON enable. Fault detection includes per-channel undervoltage monitoring (VF_FBP = 1.0 V, VF_FBN = 0.4 V, VF_FBL = 1.0 V) and overtemperature shutdown at 140°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 5.5 V - supports direct connection to common system rails without pre-regulation |
| Oscillator Frequency | 900–1100 kHz - enables compact magnetics and ceramic output capacitors in LCD panel designs |
| VBOOST Reference Voltage | 1.205 V ±0.023 V - sets precision output voltage via external resistor divider (e.g., R1/R2 = 20kΩ/7.5kΩ for 11 V) |
| VON LDO Feedback Threshold | 1.211 V ±0.028 V - regulates positive row-driver supply with 0.5% load regulation up to 20 mA |
| VOFF LDO Feedback Threshold | 0.203 V ±0.03 V - enables accurate negative bias generation (e.g., −5 V) with 0.15% load regulation |
| VLOGIC LDO Feedback Threshold | 1.2 V ±0.024 V - provides stable logic rail (2.5 V typical) with 0.5% load regulation up to 500 mA |
| Fault Timeout Time | 50 ms (with 0.1 µF CDLY) - ensures robust latch-off duration before reset requirement on EN or VDD cycle |
Pinout & Package
EL7520ILZ is housed in a 20-lead 4 mm × 4 mm × 0.9 mm QFN package (MDP0046) with exposed thermal pad. The package is RoHS-compliant (Pb-free plus anneal) and rated for −40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CDLY | Sequencing timing capacitor node | Controls start-up delay (tON = 30 ms), soft-start time (tSS = 2 ms), and fault timeout (TFAULT = 50 ms) via external capacitor |
| 2 DRVB | Boost gate driver output | Drives external N-channel MOSFET gate; voltage follows VDDP (up to 36 V), requires low-inductance routing |
| 4 ISAD | Current limit programming input | Sets peak inductor current threshold via external resistor; determines maximum output current capability |
| 6 DELB | Delayed VBOOST enable output | Active-low open-drain signal controlling external P-FET for sequenced high-voltage rail delivery |
| 8 FBB | Boost feedback input | Monitors VBOOST via resistor divider; regulated to 1.205 V - determines output accuracy and line/load regulation |
| 11 FBN | VOFF feedback input | Regulates negative supply at 0.203 V - enables precise −5 V generation with <0.15% load regulation |
| 13 FBL | VLOGIC feedback input | Regulates logic rail at 1.2 V - supports 2.5 V output with 0.5% load regulation up to 500 mA |
| 15 FBP | VON feedback input | Regulates positive row-driver supply at 1.211 V - enables +15 V output with <0.5% load regulation |
| 17 EN | Global enable input | Active-high logic control; device latches off on fault until EN toggled or VDD cycled |
| 20 PG | Fault protection gate drive | Drives external P-FET for input-side in-rush limiting; pulled high during fault or disable |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4-channel power sequencing | Programmable 6-phase ramp-based startup (VLOGIC → VBOOST → VOFF → delayed VBOOST → VON) with CDLY capacitor timing |
| P/PI mode boost control | Selectable via CINT pin: P-mode for fast transient response or PI-mode (2.2 nF to GND) for improved load regulation (0.1%) |
| Per-rail fault protection | Dedicated comparators monitor FBB, FBP, FBL, FBN; latch-off behavior prevents uncontrolled re-attempt after fault |
| Thermal shutdown | Triggers at 140°C junction temperature and holds until VDD or EN is cycled - protects against sustained overload |
| Low quiescent current | 2.5 mA enabled (no switching), 30 µA disabled - reduces standby power in always-on display subsystems |
| RoHS-compliant packaging | 20-lead 4×4 QFN (MDP0046) with matte tin termination - compatible with SnPb and Pb-free reflow profiles |
Applications
| Notebook Display Power | LCD Monitor Supply |
|---|---|
Use Scenario: Power management for 13–16-inch notebook LCD panels requiring VLOGIC (2.5 V), VON (+15 V), VOFF (−5 V), and VBOOST (~11 V). IC Role / Device Role / Timing Role: Central 4-channel controller managing sequenced rail generation, in-rush limiting, and fault-safe shutdown. Use Value: Eliminates need for four discrete controllers; reduces BOM count and PCB area while ensuring safe power-up order per LCD timing requirements. |
Use Scenario: Power solution for 15"+ desktop LCD monitors with multi-stage charge pumps and external pass transistors. IC Role / Device Role / Timing Role: Generates and sequences all bias rails, including delayed VBOOST for column drivers to prevent latch-up during startup. Use Value: Enables reliable 100+ hour MTBF through integrated soft-start, thermal shutdown, and per-rail UVLO detection. |
| Industrial LCD Panel | Medical Display System |
Use Scenario: Robust power for industrial-grade LCDs operating in extended temperature environments (−40°C to +85°C). IC Role / Device Role / Timing Role: Provides fault-latched protection and stable LDO regulation across wide input (3–5.5 V) and load variations. Use Value: Ensures uninterrupted operation under brownout or thermal stress - critical for factory HMI and control panels. |
Use Scenario: Safety-critical display power in diagnostic imaging devices where rail integrity directly impacts image fidelity. IC Role / Device Role / Timing Role: Delivers tightly regulated VLOGIC (±0.5%), VON (±0.5%), and VOFF (±0.15%) with deterministic fault response. Use Value: Meets IEC 60601-1 leakage and reliability requirements via latch-off behavior and traceable thermal shutdown. |
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; no external boost switch required; higher integration but fixed 1.2 MHz frequency | Reduces external component count (no Q1, D1, L1); not suitable where discrete FET selection is needed for efficiency optimization | Preferred for new designs targeting smaller footprint and simplified layout; requires validation of thermal performance under 500 mA VLOGIC loads |
| EL7520AILZ | VREF permanently enabled; VLOGIC powers on immediately at VDD > 2.5 V; different sequencing order (VLOGIC → VOFF → VBOOST → VON) | Eliminates VLOGIC soft-start delay - beneficial for systems requiring immediate logic rail availability | Choose when early VLOGIC enable is mandatory; verify compatibility with existing CDLY timing and fault recovery behavior |
Compared with EL7520ILZ, ISL97645A offers higher integration but less flexibility in FET selection and thermal design, while EL7520AILZ modifies sequencing priority at the cost of losing programmable VLOGIC delay - both require board-level validation for fault response and startup timing compliance.
Availability
EL7520ILZ is available at Aetrix Electronics and suitable for notebook displays (up to 16"), LCD monitors (15"+), and industrial LCD panels requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for EL7520ILZ 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 manufacturer specializing in high-performance analog and power management ICs for display, industrial, and communications markets.
The EL7520ILZ belongs to Intersil's TFT-LCD power controller product line, designed specifically to replace multi-IC discrete solutions with a single-package, sequenced, fault-protected power system for LCD column and row drivers.
FAQ
What is the primary function of the EL7520ILZ in an LCD power system?
The EL7520ILZ serves as a complete 4-channel DC/DC controller for TFT-LCD panels, generating and sequencing VBOOST (via external boost FET), VON (+15 V), VOFF (−5 V), and VLOGIC (2.5 V) rails. It integrates start-up sequencing, fault protection, and P/PI mode regulation - eliminating the need for separate controllers and discrete timing components in EL7520ILZ-based designs.
How does the EL7520ILZ handle fault conditions such as overvoltage or overtemperature?
Upon detecting any fault - including VBOOST, VON, VOFF, or VLOGIC undervoltage, or junction temperature exceeding 140°C - the EL7520ILZ latches off all outputs and pulls PG high. Recovery requires cycling either the EN pin or the VDD supply. This behavior is explicitly defined in the EL7520ILZ datasheet and ensures system safety during abnormal operation.
Can the EL7520ILZ operate in both P-mode and PI-mode for the boost regulator, and how is mode selection implemented?
Yes, the EL7520ILZ supports both P-mode (fast transient response) and PI-mode (improved load regulation). Mode selection is implemented via the CINT pin: connecting CINT to VREF selects P-mode; connecting a 2.2 nF capacitor from CINT to SGND configures PI-mode. This configuration is confirmed in the EL7520ILZ electrical specifications table and functional diagrams.
What is the role of the CDLY pin, and what capacitor value is recommended for standard sequencing timing?
The CDLY pin sets start-up delay (tON = 30 ms), soft-start time (tSS = 2 ms), and fault timeout (TFAULT = 50 ms) using an external capacitor to ground. A 0.1 µF capacitor is specified in the EL7520ILZ datasheet for these nominal timing values and is used in all typical application waveforms and sequencing diagrams.
Is the EL7520ILZ pin-compatible with the EL7520AILZ, and what are the key behavioral differences?
No, the EL7520ILZ is not pin-compatible with the EL7520AILZ in terms of sequencing behavior - though both share identical pinouts and package. The EL7520AILZ permanently enables VREF and initiates VLOGIC earlier in the sequence, altering timing relationships. These differences are documented in the EL7520ILZ datasheet's "Features" and "Start-Up Sequence" sections and require layout verification if substituted.
EL7520ILZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tube
- 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)
EL7520ILZ FAQ
1.How can I place an order for EL7520ILZ through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7520ILZ 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 EL7520ILZ reliable?
The price and inventory of EL7520ILZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7520ILZ is usually 5 days.
3.What payment methods are accepted for EL7520ILZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7520ILZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7520ILZ?
EL7520ILZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7520ILZ 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 EL7520ILZ?
For technical support, including EL7520ILZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7520ILZ requirements.
6.How does Aetrix verify that EL7520ILZ is sourced from the original manufacturer or authorized distributors?
All EL7520ILZ 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 EL7520ILZ meets industry standards.
7.What is the process for return or replacement of EL7520ILZ?
All EL7520ILZ units undergo pre-shipment inspection (PSI). If there is an issue with EL7520ILZ, 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 EL7520ILZ part is unused and in its original packaging.
Return procedure for EL7520ILZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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