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Renesas EL7531IYZ
- Part No.:
- EL7531IYZ
- Manufacturer:
- Renesas
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
EL7531IYZ.pdf
- Description:
- IC REG BUCK ADJ 1A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,008
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Product details
Overview
EL7531IYZ from Intersil is a synchronous, integrated-FET 1A step-down DC/DC regulator in a 10-lead MSOP package, operating from 2.5V to 5.5V input and delivering adjustable output from 0.8V to VIN. It features automatic PFM/PWM mode switching, 1.4MHz nominal switching frequency (synchronizable up to 12MHz), 120µA no-load quiescent current, and Power-Good (PG) open-drain output - deployed in Li-Ion–powered portable electronics requiring compact, high-efficiency power conversion.
For engineers reviewing the EL7531IYZ datasheet, EL7531IYZ pinout, EL7531IYZ application, or EL7531IYZ equivalent, key selection considerations include its internal compensation, dual-mode operation, thermal shutdown threshold (145°C), PG output behavior, and MSOP10 footprint constraints for one-side PCB assembly.
Technical Context
The EL7531IYZ implements a voltage-mode PWM controller with fixed internal compensation, enabling stable regulation without external loop components. Its dual-mode architecture automatically transitions between discontinuous-conduction PFM (for >70% efficiency at 1mA load) and continuous-conduction PWM (at ~250mA threshold), minimizing light-load losses while maintaining tight line/load regulation (±0.1% to ±0.4%).
Control logic integrates synchronous rectification using internal PMOS (70mΩ RDS(ON)) and NMOS (45mΩ RDS(ON)) switches, soft-start (650µs), overcurrent limiting (1.5A), and thermal shutdown with 15°C hysteresis (145°C trip / 130°C recovery). The SYNC pin supports forced PWM or external synchronization from 1.6MHz to 12MHz.
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 or RF subsystems in portable devices; peak current limit 1.5A. |
| Switching Frequency | 1.4MHz typical (1.25–1.6MHz range); synchronizable to 12MHz - enables small external LC filter (1.8µH + 10µF). |
| Quiescent Current | 120µA in PFM mode - extends battery runtime in standby; <1µA in shutdown. |
| Feedback Voltage | 800mV ±10mV - sets output via resistor divider; enables precise 0.8V–VIN adjustment with <0.3% temp drift. |
| Power-Good Threshold | 95% of target VFB rising / 86% falling - provides reliable system power sequencing and fault detection. |
| Thermal Shutdown | 145°C trip with 130°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
EL7531IYZ is housed in a RoHS-compliant, Pb-free 10-lead MSOP package (M10.118A), 3.0mm × 4.9mm × 1.1mm max height, rated for –40°C to +85°C ambient operation. The fused-lead construction delivers θJA = 115°C/W (high-thermal-conductivity board) or 206°C/W (low-conductivity board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SGND | Signal Ground Reference | Return path for control circuitry; must be separated from PGND and joined at single point near IC. |
| 2 PGND | Power Ground Reference | Return path for high-current LX switching node; requires large copper pour and multiple vias for thermal relief. |
| 3 LX | Switch Node | Drives external inductor; carries pulsed 1A current; layout critical to minimize EMI and voltage ringing. |
| 4 VIN | Main Input Supply | Connects to 2.5–5.5V source; requires low-ESR ceramic capacitor placed adjacent to PIN 4 and PIN 2. |
| 5 VDD | Controller Supply | Internal bias rail; decoupled by C2 (10µF); not externally powered - derived from VIN internally. |
| 6 SYNC | Mode Control & Sync Input | Pull high (>2.5V) for forced PWM; ground for auto PFM/PWM; accept 1.6–12MHz external clock for EMI reduction. |
| 7 EN | Enable Input | Active-high logic input; 2.4V turn-on threshold; <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 is within ±5% of target. |
| 9 VO | Output Voltage Sense | Direct connection to regulated output; used with FB to form feedback loop; routed away from noisy traces. |
| 10 FB | Feedback Input | 800mV reference input; connects to resistor divider (R1/R2) between VO and SGND for output programming. |
Key Features
| Feature | Design Value |
|---|---|
| One-Side PCB Assembly | Entire 1A converter occupies <0.15 in² (0.97 cm²) with all components on top layer - reduces assembly cost and simplifies routing. |
| Internally Compensated Controller | No external compensation network required - eliminates tuning effort and component count while ensuring stability across recommended 1.5–2.2µH inductors and 10–22µF capacitors. |
| PFM/PWM Auto-Transition | Seamlessly shifts from high-efficiency PFM (<120µA IQ) at light loads to fixed-frequency PWM at ~250mA - maintains >70% efficiency down to 1mA and >90% at full load. |
| Robust Protection Suite | Includes cycle-by-cycle overcurrent limiting (1.5A), thermal shutdown (145°C), short-circuit protection, and UVLO (2.2V startup / 2.0V shutdown). |
| Low-Profile MSOP10 Package | 1.1mm max height enables use in ultra-thin handhelds and SFP modules where Z-height is constrained. |
Applications
| Li-Ion–Powered Portable Devices | Small Form Factor Modules |
|---|---|
|
Use Scenario: Powering baseband processors and display drivers in barcode scanners and handheld PDAs with single-cell Li-Ion (2.7–4.2V). IC Role / Device Role / Timing Role: Primary 1A step-down regulator generating 1.8V core supply; manages dynamic load transients during scan bursts. Use Value: 120µA quiescent current extends battery life in intermittent-use devices; PG signal enables safe processor reset sequencing. |
Use Scenario: Providing regulated 3.3V or 2.5V to optical transceivers in SFP+ pluggable modules with strict thermal and area limits. IC Role / Device Role / Timing Role: Compact, thermally efficient DC/DC converter replacing discrete buck solutions; operates reliably at 85°C ambient. Use Value: MSOP10 footprint and 1.1mm height meet SFP mechanical specs; 12MHz sync capability suppresses conducted EMI in high-speed data links. |
| Cellular Handset Subsystems | Portable Test Equipment |
|
Use Scenario: Supplying 1.2V to application processors or 1.5V to memory interfaces in feature phones and early smartphones. IC Role / Device Role / Timing Role: Secondary regulator downstream of main PMIC; handles fast load steps during RF transmission bursts. Use Value: 650µs soft-start prevents inrush-induced brownouts; PFM-to-PWM transition minimizes output droop during wake-up events. |
Use Scenario: Generating stable 1.8V or 2.8V rails for ADC front-ends and microcontroller cores in handheld multimeters and signal analyzers. IC Role / Device Role / Timing Role: Precision-adjustable, low-noise power source with tight line/load regulation (±0.1–0.4%) for measurement accuracy. Use Value: 800mV feedback reference and <0.3% VFB drift over temperature ensure consistent output setpoint across operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRVR | 1A, 2.05–6.0V input, 2.5MHz fixed frequency, 17µA IQ - higher switching frequency but no PFM mode or PG output. | Lacks Power-Good signaling and auto PFM; better suited for noise-sensitive analog rails where constant frequency is mandatory. | Select TPS62231DRVR when EMI filtering simplicity outweighs need for ultra-low IQ or system-level power sequencing. |
| Analog Devices ADP2301ARDZ-REEL7 | 1.2A, 3.0–20V input, 700kHz fixed frequency, 2.5mA IQ - wider VIN range but higher quiescent current and no sync capability. | Targets industrial 12V/24V inputs; unsuitable for Li-Ion due to 3V minimum VIN and lack of sub-3V operation. | Choose ADP2301ARDZ-REEL7 only for higher-input-voltage systems where 120µA IQ and 12MHz sync are not required. |
Compared with TPS62231DRVR and ADP2301ARDZ-REEL7, the EL7531IYZ uniquely combines Li-Ion-compatible input range, ultra-low 120µA quiescent current, Power-Good signaling, and 12MHz synchronization - making it optimal for space-constrained, battery-powered applications demanding both efficiency and system control.
Availability
EL7531IYZ is available at Aetrix Electronics and suitable for Li-Ion–powered portable devices, small form factor optical modules, and handheld test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for EL7531IYZ 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 EL7531IYZ belongs to Intersil's monolithic synchronous buck regulator product line, engineered specifically for compact, battery-operated portable electronics needing high efficiency across wide load ranges and robust thermal performance in minimal PCB area.
FAQ
What is the minimum input voltage required for EL7531IYZ to start regulation?
The EL7531IYZ begins regulation when VIN rises above 2.2V to 2.4V (startup threshold), with guaranteed operation from 2.5V. Below 2.2V, the device remains in undervoltage lockout; at 2.0V to 2.2V, it shuts down. This ensures clean startup from partially discharged Li-Ion cells while preventing unstable operation near end-of-discharge.
Does EL7531IYZ require external compensation components?
No, the EL7531IYZ uses an internally compensated voltage-mode controller. External compensation is unnecessary - stability is ensured across the recommended 1.5µH to 2.2µH inductor and 10µF to 22µF ceramic capacitor range, simplifying design and reducing BOM count.
How does the Power-Good (PG) output of EL7531IYZ behave during startup and fault conditions?
The EL7531IYZ PG pin is an open-drain output that pulls low until VFB reaches ≥95% of its 800mV target and remains high only if EN is asserted and no overtemperature or overcurrent fault occurs. During startup, PG asserts after soft-start completes (~650µs); it deasserts instantly upon output droop exceeding –14% or thermal shutdown.
Can EL7531IYZ operate with a 12MHz external clock, and what layout precautions apply?
Yes, the EL7531IYZ accepts external SYNC signals up to 12MHz. To maintain signal integrity, route the SYNC trace short and away from LX and PGND; use a 50Ω series resistor near the IC pin; and avoid stubs or vias. Layout errors may cause jitter or mode instability, especially near the 12MHz upper limit.
What is the thermal performance difference between the EL7531IYZ MSOP10 package and standard MSOP packages?
The EL7531IYZ uses a fused-lead MSOP10 (M10.118A) with lower thermal resistance than standard MSOP: θJA = 115°C/W (4-layer board) vs. typical 150–180°C/W. This allows 870mW dissipation at 85°C ambient - enabling full 1A operation without derating in compact layouts with adequate copper area and thermal vias under PGND.
EL7531IYZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for EL7531IYZ through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7531IYZ 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 reliable?
The price and inventory of EL7531IYZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7531IYZ is usually 5 days.
3.What payment methods are accepted for EL7531IYZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7531IYZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7531IYZ?
EL7531IYZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7531IYZ 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?
For technical support, including EL7531IYZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7531IYZ requirements.
6.How does Aetrix verify that EL7531IYZ is sourced from the original manufacturer or authorized distributors?
All EL7531IYZ 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 meets industry standards.
7.What is the process for return or replacement of EL7531IYZ?
All EL7531IYZ units undergo pre-shipment inspection (PSI). If there is an issue with EL7531IYZ, 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 part is unused and in its original packaging.
Return procedure for EL7531IYZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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