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Renesas EL7531IY-T7
- Part No.:
- EL7531IY-T7
- Manufacturer:
- Renesas
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
EL7531IY-T7.pdf
- Description:
- IC REG BUCK ADJ 1A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,024
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Product details
Overview
EL7531IY-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–VIN) for Li-Ion, 3.3V, or 5V rail conversion in space-constrained portable systems. It features automatic PFM/PWM mode switching, 1.4MHz nominal PWM frequency (synchronizable up to 12MHz), and 120µA no-load quiescent current.
For engineers reviewing the EL7531IY-T7 datasheet, EL7531IY-T7 pinout, EL7531IY-T7 application, or EL7531IY-T7 equivalent, key selection criteria include its MSOP-10 footprint (<0.15 in²), Power-Good open-drain output, <1µA shutdown current, and thermal protection with 145°C trip threshold - all critical for battery-powered PDA, barcode reader, and SFP module designs.
Technical Context
The EL7531IY-T7 implements a voltage-mode control architecture with fixed internal compensation, eliminating external loop components. Its dual-stage MOSFET driver integrates a 70mΩ PMOS and 45mΩ NMOS high-side/low-side switch, enabling synchronous rectification and up to 94% peak efficiency at 1A load.
It supports three operational modes: auto PFM/PWM (for light-load efficiency >70% at 1mA), forced PWM (via SYNC high), and externally synchronized PWM (1.6–12MHz). The Power-Good (PG) output asserts when FB voltage reaches 95% of target and deasserts at 86%, with 35mV typical drop under 3.3mA sink.
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 supply rails without level-shifting. |
| Output Current | 1A continuous - sufficient for core logic, memory, and RF subsystems in handheld devices. |
| Quiescent Current | 120µA in PFM mode - extends battery runtime in standby or low-activity states. |
| Switching Frequency | 1.4MHz typical (1.25–1.6MHz) - enables compact 1.8µH inductor and 10µF ceramic capacitors. |
| Feedback Voltage | 800mV ±10mV - sets output via resistor divider; enables precise 0.8V–VIN adjustment. |
| Shutdown Current | <1µA - ensures near-zero power draw during system sleep or off-state. |
| Thermal Shutdown | 145°C trip / 130°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Power-Good Accuracy | ±5% regulation window (95%/86% FB thresholds) - provides reliable system reset and sequencing signaling. |
Pinout & Package
EL7531IY-T7 is housed in a RoHS-compliant 10-lead MSOP package (M10.118A), 3.0mm × 4.9mm × 1.1mm max height, rated for –40°C to +85°C ambient operation. Thermal resistance θJA is 115°C/W on high-conductivity board, 206°C/W on standard JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SGND | Signal Ground Reference | Return path for controller 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 Output | Drives external inductor; carries pulsed 1.2A peak current; layout minimization critical for EMI and efficiency. |
| 4 VIN | Main Power Input | Supplies power stage (PMOS/NMOS); accepts 2.5–5.5V; requires local 10µF ceramic decoupling to PGND. |
| 5 VDD | Controller Supply | Provides bias for internal logic and gate drivers; derived from VIN but internally regulated. |
| 6 SYNC | Mode Control & Sync Input | Ground = auto PFM/PWM; VIN = forced PWM; external 1.6–12MHz clock = synchronized PWM. |
| 7 EN | Enable Input | Active-high logic input; 2.4V threshold rising; pulls internal circuitry into <1µA shutdown when low. |
| 8 PG | Power-Good Open-Drain | Signals valid regulation; requires external 100kΩ pull-up to VIN; sinks 3.3mA when asserted low. |
| 9 VO | Output Voltage Sense | Direct connection to regulated output; used with FB to close feedback loop in high-side sensing configuration. |
| 10 FB | Feedback Input | Monitors resistor divider (R1/R2) between VO and SGND; 800mV reference sets output voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous FETs | 70mΩ PMOS + 45mΩ NMOS eliminates external MOSFETs and reduces BOM count and layout area. |
| Auto PFM/PWM Transition | Seamlessly switches at ~250mA load to maintain >70% efficiency down to 1mA, optimizing battery life. |
| Internal Compensation | Removes need for external compensation network - simplifies design and improves production consistency. |
| 10-Lead MSOP Footprint | 0.97 cm² total converter area with one-side assembly - ideal for ultra-thin PDAs, barcode scanners, and SFP modules. |
| Robust Protection Suite | Includes overcurrent limit (1.5A), short-circuit foldback, thermal shutdown (145°C), and UVLO (2.2V startup). |
| Pb-Free RoHS Compliance | M10.118A package uses 100% matte tin terminations and Pb-free molding compound, compatible with SnPb and Pb-free reflow. |
Applications
| Portable Barcode Readers | Li-Ion–Powered PDAs |
|---|---|
Use Scenario: Compact handheld scanner requiring stable 1.8V/1A rail from 3.7V Li-Ion battery with minimal PCB area. IC Role / Device Role / Timing Role: Primary step-down regulator supplying processor core voltage with automatic light-load efficiency management. Use Value: 120µA quiescent current extends idle time; MSOP-10 footprint fits tight mechanical envelopes; PG signal enables clean boot sequencing. |
Use Scenario: Pocket PC with multi-rail power system where 3.3V input must generate 1.2V for ARM CPU and 1.8V for memory interface. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting dynamic voltage scaling and brownout-safe shutdown. Use Value: External resistor divider enables precise 1.2V/1.8V outputs; <1µA shutdown current prevents battery drain during suspend; thermal hysteresis avoids oscillation near trip point. |
| Small Form Factor (SFP) Modules | Portable Test Equipment |
Use Scenario: Hot-pluggable optical transceiver needing 3.3V-to-2.5V conversion with EMI-sensitive analog front-end. IC Role / Device Role / Timing Role: Low-noise, synchronizable DC/DC regulator providing clean 2.5V supply with programmable switching frequency. Use Value: SYNC pin allows locking to system clock (up to 12MHz) to shift noise away from critical bands; 94% efficiency reduces thermal load in sealed module. |
Use Scenario: Battery-operated handheld multimeter or signal generator requiring long runtime and stable analog reference voltage. IC Role / Device Role / Timing Role: Main supply regulator for mixed-signal SoC with precision ADC/DAC and real-time display controller. Use Value: Power-Good output validates regulation before enabling measurement circuits; PFM mode maintains accuracy during low-power sampling intervals. |
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 TPS62231DRYT | 1A, 2.05–6.5V input, 2.2MHz fixed frequency, 17µA IQ, no PG output, 6-pin WSON. | Lacks Power-Good and thermal hysteresis; better for ultra-low-IQ apps where sequencing isn't required. | Choose when minimum quiescent current (17µA) outweighs need for PG signaling and robust fault reporting. |
| Analog Devices ADP2301ARMZ-R7 | 1.2A, 3.0–20V input, 700kHz fixed frequency, 2.5mA IQ, PG output, 8-pin SOIC. | Wider VIN range but higher IQ and larger SOIC package; lacks PFM mode and sync capability. | Prefer for industrial 12V/24V inputs where MSOP size isn't constrained and 12MHz sync isn't needed. |
Compared with TPS62231DRYT and ADP2301ARMZ-R7, EL7531IY-T7 uniquely balances ultra-low PFM IQ (120µA), integrated PG, MSOP-10 compactness, and 12MHz synchronization - making it optimal for battery-powered portable electronics demanding both efficiency and system-level reliability.
Availability
EL7531IY-T7 is available at Aetrix Electronics and suitable for portable barcode readers, Li-Ion–powered PDAs, and small form factor (SFP) modules requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for EL7531IY-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- and power-constrained portable electronics, delivering high-efficiency, low-quiescent-current DC/DC conversion in minimal PCB area with integrated protection and system monitoring features.
FAQ
What is the recommended inductor value for EL7531IY-T7 in a typical 1.8V@1A application?
The EL7531IY-T7 datasheet specifies a nominal 1.8µH inductor for 1.8V output at 1A, with acceptable range 1.5µH–2.2µH. This value balances ripple current (≈300mA pk-pk), efficiency (>92%), and transient response. Inductor saturation current must exceed 2A to survive current-limit events, and DC resistance should be ≤30mΩ to minimize conduction loss. Use shielded power inductors rated for 1.4MHz operation.
Does EL7531IY-T7 support pre-biased output startup?
Yes, EL7531IY-T7 supports pre-biased output startup. During enable, it begins in PFM mode regardless of SYNC state, allowing safe ramp-up even when VO is initially non-zero. This prevents reverse current flow into the output capacitor and avoids potential damage to downstream circuitry - a critical feature for hot-swap and multi-rail systems where other regulators may already be active.
How does the Power-Good (PG) output of EL7531IY-T7 behave during thermal shutdown?
During thermal shutdown, the EL7531IY-T7 disables both MOSFETs and forces PG low within microseconds. PG remains low until junction temperature falls below 130°C (hysteresis), at which point the device restarts and PG reasserts only after FB voltage stabilizes within ±5% of target. This ensures PG never falsely indicates "good" during thermal recovery cycles, preventing premature system wake-up.
Can EL7531IY-T7 operate with ceramic output capacitors smaller than 10µF?
No - the EL7531IY-T7 requires ≥10µF X5R/X7R ceramic output capacitance for stability due to its fixed internal compensation. Using less capacitance risks loop instability, excessive output ripple, or oscillation. The datasheet explicitly recommends 10µF–22µF; 4.7µF or tantalum alternatives are not validated and may cause erratic behavior or failure to regulate under load transients.
What is the maximum allowable SYNC input frequency for EL7531IY-T7, and what happens above that limit?
The EL7531IY-T7 supports external synchronization up to 12MHz. Above this frequency, the internal timing circuit cannot reliably lock, causing erratic switching, increased jitter, or fallback to free-running 1.4MHz operation. Pulse width must remain ≥25ns; shorter pulses may be ignored or misinterpreted, leading to mode instability. Always verify SYNC waveform integrity with oscilloscope at the SYNC pin.
EL7531IY-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:
- Obsolete
- 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
EL7531IY-T7 FAQ
1.How can I place an order for EL7531IY-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7531IY-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 EL7531IY-T7 reliable?
The price and inventory of EL7531IY-T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7531IY-T7 is usually 5 days.
3.What payment methods are accepted for EL7531IY-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7531IY-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7531IY-T7?
EL7531IY-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7531IY-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 EL7531IY-T7?
For technical support, including EL7531IY-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7531IY-T7 requirements.
6.How does Aetrix verify that EL7531IY-T7 is sourced from the original manufacturer or authorized distributors?
All EL7531IY-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 EL7531IY-T7 meets industry standards.
7.What is the process for return or replacement of EL7531IY-T7?
All EL7531IY-T7 units undergo pre-shipment inspection (PSI). If there is an issue with EL7531IY-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 EL7531IY-T7 part is unused and in its original packaging.
Return procedure for EL7531IY-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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