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Renesas EL7531IYZ-T7
- Part No.:
- EL7531IYZ-T7
- Manufacturer:
- Renesas
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
EL7531IYZ-T7.pdf
- Description:
- IC REG BUCK ADJ 1A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,497
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Product details
Overview
EL7531IYZ-T7 from Intersil is a synchronous, integrated-FET 1A step-down DC-DC regulator with internal compensation, operating from 2.5V to 5.5V input and delivering adjustable output (0.8V to VIN) via external resistor divider. It features automatic PFM/PWM mode switching, 1.4MHz nominal PWM frequency (synchronizable up to 12MHz), 120µA no-load quiescent current, and Power-Good open-drain output. It targets space-constrained Li-Ion–powered portable electronics requiring high efficiency at light load.
For engineers reviewing the EL7531IYZ-T7 datasheet, EL7531IYZ-T7 pinout, EL7531IYZ-T7 application, or EL7531IYZ-T7 equivalent, key selection criteria include its MSOP10 package footprint (<0.15 in²), dual-mode control architecture, thermal shutdown threshold (145°C), PG output behavior, and verified 94% peak efficiency at 1A - all critical for battery life, EMI compliance, and system power sequencing validation.
Technical Context
The EL7531IYZ-T7 implements a voltage-mode, internally compensated synchronous buck controller with dual-path operation: PFM mode enables >70% efficiency at 1mA load, while PWM mode maintains continuous conduction above ~250mA with fixed 1.4MHz switching (±150kHz). Its SYNC pin supports three states - ground (auto PFM/PWM), VIN (forced PWM), or external clock (1.6–12MHz sync) - enabling precise EMI management without layout changes.
It integrates both PMOS (70mΩ typ) and NMOS (45mΩ typ) power FETs, uses separate SGND and PGND pins to isolate signal and power return paths, and incorporates overcurrent protection (1.5A limit), thermal shutdown (145°C trip, 130°C hysteresis), and <1µA shutdown current. The PG output asserts high only when VFB is within ±5% of 800mV and EN is active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-Ion, 3.3V, and 5V rails without external LDO pre-regulation. |
| Output Current | 1A continuous - sufficient for core logic, RF transceivers, or sensor subsystems in portable devices. |
| Switching Frequency | 1.4MHz typical (1.25–1.6MHz range) - enables compact LC filter design with ≤2.2µH inductor and 10–22µF ceramic caps. |
| Quiescent Current | 120µA in PFM mode - extends battery runtime in standby or low-activity states (e.g., barcode scanner sleep). |
| Feedback Voltage | 800mV ±10mV - sets output accuracy; used with external R1/R2 divider to configure VO = 0.8V × (1 + R1/R2). |
| Power-Good Threshold | VFB ≥95% of target (760mV min) to assert PG high - provides reliable system reset signaling during power-up. |
| Thermal Shutdown | 145°C junction trip with 15°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
EL7531IYZ-T7 is housed in a 10-lead MSOP package (M10.118A), RoHS-compliant, with max height 1.1mm and specified for -40°C to +85°C ambient operation. Thermal resistance θJA is 115°C/W on high-conductivity board (JEDEC JESD51-7), enabling 870mW dissipation at 85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SGND) | Signal Ground Reference | Return path for control circuitry; must be isolated from PGND and connected at single point near FB/EN pins. |
| 2 (PGND) | Power Ground Reference | High-current return for LX and VIN; requires large copper pour and multiple vias for thermal/EMI performance. |
| 3 (LX) | Switch Node | Drives external inductor; carries high di/dt; must be routed short and wide to minimize ringing and EMI. |
| 4 (VIN) | Main Power Input | Supplies power stage (PMOS/NMOS); requires local 10µF ceramic cap placed adjacent to PIN 4 and PIN 2. |
| 5 (VDD) | Controller Supply | Provides bias to internal logic; decoupled by same input capacitor as VIN but referenced to SGND. |
| 6 (SYNC) | Mode Control & Sync Input | Ground = auto PFM/PWM; VIN = forced PWM; external 1.6–12MHz clock = synchronized PWM for EMI reduction. |
| 7 (EN) | Enable Input | Active-high logic input; rising threshold 2.4V, falling threshold 0.8V; <1µA shutdown current when pulled low. |
| 8 (PG) | Power-Good Output | Open-drain NMOS; requires external 100kΩ pull-up to VIN; asserts high only when VFB stable within ±5%. |
| 9 (VO) | Output Voltage Sense | Direct connection to regulated output node; used with FB to close feedback loop; sensitive to noise coupling. |
| 10 (FB) | Feedback Input | Monitors resistive divider output; 100nA input bias enables high-value dividers (e.g., 124kΩ/100kΩ for 1.8V). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous FETs | 70mΩ PMOS + 45mΩ NMOS enable >94% efficiency without external MOSFETs or gate drivers. |
| Auto PFM/PWM Transition | Seamlessly switches at ~250mA load to maintain >70% efficiency from 1mA to 1A - critical for burst-mode applications. |
| Internal Compensation | Fixed Type-II compensation eliminates external compensation components, reducing BOM count and layout sensitivity. |
| Power-Good Monitoring | Accurate 800mV reference with ±5% window ensures reliable system reset and sequencing in multi-rail designs. |
| Low-Profile MSOP10 Package | 1.1mm max height and 0.97 cm² footprint allow placement in ultra-thin handhelds and SFP modules. |
Applications
| Li-Ion–Powered Portable Devices | Barcode Scanners |
|---|---|
Use Scenario: Powering ARM Cortex-M microcontrollers and display drivers in handheld PDAs with single-cell Li-Ion (2.7–4.2V). IC Role / Device Role / Timing Role: Primary 1.8V/1A step-down regulator supplying processor core and I/O rails. Use Value: 120µA quiescent current extends standby time; PFM mode sustains >75% efficiency at 10mA sleep current. |
Use Scenario: Providing stable 3.3V rail for CMOS image sensors and laser diode drivers in rugged industrial scanners. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC converter mounted directly on scanner PCB. Use Value: MSOP10 package fits tight mechanical envelopes; 145°C thermal shutdown prevents field failures under dust-clogged conditions. |
| Small Form Factor (SFP) Modules | Cellular Handset Subsystems |
Use Scenario: Generating 1.2V core voltage for SFP+ transceiver ASICs in telecom line cards with strict EMI limits. IC Role / Device Role / Timing Role: Synchronized PWM regulator locked to system clock to suppress switching noise in 10Gbps data lanes. Use Value: External SYNC input supports 12MHz synchronization, shifting noise spectrum away from critical harmonics. |
Use Scenario: Supplying 1.5V to baseband processors during call setup and 2.8V to audio codecs during voice playback. IC Role / Device Role / Timing Role: Dual-output-capable buck regulator (via resistor reconfiguration) supporting dynamic voltage scaling. Use Value: Adjustable output (0.8V–VIN) and soft-start (650µs) prevent inrush-induced brownouts during mode transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3MHz fixed-frequency PWM only; 22µA IQ; 0.6V feedback; smaller 6-pin WSON package. | Lacks PFM mode and SYNC input; better suited for ultra-low-IQ always-on rails than variable-load systems. | Select when minimal quiescent current and smallest footprint outweigh need for light-load efficiency and EMI control. |
| RT8059NGSP | 2MHz PWM-only; 30µA IQ; 0.6V feedback; includes built-in soft-start and UVLO hysteresis. | No PFM mode or synchronization capability; higher minimum input (2.7V) excludes sub-2.7V Li-Ion discharge tail. | Prefer for cost-sensitive consumer designs where fixed 2MHz operation and simplified enable logic suffice. |
Compared with TPS62231DRYR and RT8059NGSP, the EL7531IYZ-T7 uniquely balances ultra-low-light-load efficiency (via PFM), EMI flexibility (via SYNC), and robust thermal protection - making it optimal for portable equipment with dynamic load profiles and stringent reliability requirements.
Availability
EL7531IYZ-T7 is available at Aetrix Electronics and suitable for Li-Ion–powered portable devices, barcode scanners, SFP modules, and cellular handset subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for EL7531IYZ-T7 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 Corporation (now part of Renesas Electronics) is a leader in precision analog and power management ICs, serving industrial, infrastructure, and mobile computing markets with high-reliability, thermally optimized solutions.
The EL7531 product line was designed specifically for space-constrained, battery-operated portable electronics demanding high light-load efficiency, low-profile packaging, and robust fault protection without external compensation components.
FAQ
What is the recommended inductor value for EL7531IYZ-T7 in a 1.8V@1A application?
The EL7531IYZ-T7 datasheet specifies 1.5µH to 2.2µH for optimal stability and ripple performance. For 1.8V output at 1A with 3.3V input, a 1.8µH shielded power inductor rated for ≥2A saturation current and low DCR is recommended. This value balances peak-to-peak inductor ripple (~300mA) and efficiency across load range while staying within the fixed internal compensation constraints.
Does EL7531IYZ-T7 support pre-biased output startup?
Yes, the EL7531IYZ-T7 supports pre-biased output startup. During initial enable, it begins in PFM mode regardless of SYNC pin state, allowing safe start-up into an already charged output capacitor. This prevents reverse current flow and avoids disrupting downstream circuitry powered by the same rail before the regulator engages.
How does the Power-Good (PG) output of EL7531IYZ-T7 behave during thermal shutdown?
During thermal shutdown, the EL7531IYZ-T7 disables both power FETs and halts switching, causing VOUT to collapse. As VFB falls below 86% of 800mV, the PG open-drain output is actively pulled low. PG remains low until VFB rises above 95% of 800mV and remains stable - ensuring PG only asserts after full thermal recovery and regulation re-establishment.
Can EL7531IYZ-T7 operate with input voltage below 2.5V?
No, EL7531IYZ-T7 has a guaranteed minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Specifications. Operation below 2.5V may result in undefined behavior, failure to regulate, or inability to sustain 1A output. The device enters undervoltage lockout (UVLO) if VIN falls below 2.2V (typical turn-off threshold), and will not restart until VIN exceeds 2.4V (typical turn-on threshold).
What is the purpose of the phase-lead capacitor C4 in EL7531IYZ-T7 applications?
The phase-lead capacitor C4 (e.g., 470pF for 1.8V output) adds a zero-pole pair in the control loop to improve phase margin during PFM-to-PWM transitions. It mitigates output voltage perturbation caused by control-mode switching, stabilizing regulation during dynamic load steps. Its value is calculated based on R2 and target zero frequency (~2.5kHz), as defined in the EL7531 Applications Information section.
EL7531IYZ-T7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
EL7531IYZ-T7 FAQ
1.How can I place an order for EL7531IYZ-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7531IYZ-T7 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 EL7531IYZ-T7 reliable?
The price and inventory of EL7531IYZ-T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7531IYZ-T7 is usually 5 days.
3.What payment methods are accepted for EL7531IYZ-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7531IYZ-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7531IYZ-T7?
EL7531IYZ-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7531IYZ-T7 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 EL7531IYZ-T7?
For technical support, including EL7531IYZ-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7531IYZ-T7 requirements.
6.How does Aetrix verify that EL7531IYZ-T7 is sourced from the original manufacturer or authorized distributors?
All EL7531IYZ-T7 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 EL7531IYZ-T7 meets industry standards.
7.What is the process for return or replacement of EL7531IYZ-T7?
All EL7531IYZ-T7 units undergo pre-shipment inspection (PSI). If there is an issue with EL7531IYZ-T7, 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 EL7531IYZ-T7 part is unused and in its original packaging.
Return procedure for EL7531IYZ-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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