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Renesas EL7531IY-T13
- Part No.:
- EL7531IY-T13
- Manufacturer:
- Renesas
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
EL7531IY-T13.pdf
- Description:
- IC REG BUCK ADJ 1A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,286
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Product details
Overview
EL7531IY-T13 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 electronics. It features automatic PFM/PWM mode switching, 1.4MHz nominal switching frequency, and Power-Good indication.
For engineers reviewing the EL7531IY-T13 datasheet, EL7531IY-T13 pinout, EL7531IY-T13 application, or EL7531IY-T13 equivalent, key selection criteria include quiescent current (120µA), shutdown current (<1µA), thermal protection (145°C trip), MSOP-10 footprint (0.97 cm²), and external synchronization capability up to 12MHz.
Technical Context
The EL7531IY-T13 implements a voltage-mode PWM controller with fixed internal compensation and automatic PFM/PWM transition at ~250mA load. Its dual-MOSFET power stage integrates a 70mΩ PMOS and 45mΩ NMOS switch, enabling >94% peak efficiency and continuous conduction mode above light-load thresholds.
Control logic includes soft-start (650µs), overcurrent limiting (1.5A), over-temperature shutdown (145°C with 15°C hysteresis), and open-drain Power-Good monitoring referenced to feedback voltage (±5% window). The SYNC pin supports three modes: ground (auto PFM/PWM), VIN (forced PWM), or external clock (1.6–12MHz).
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 supply rails without external LDO pre-regulation. |
| Output Current | 1A continuous - sufficient for core logic, RF transceivers, or sensor subsystems in handheld devices. |
| Quiescent Current | 120µA typical in PFM mode - enables multi-week battery life in always-on low-power states. |
| Switching Frequency | 1.4MHz typical, synchronizable to 12MHz - allows compact LC filtering and EMI spread-spectrum tuning. |
| Feedback Voltage | 800mV ±10mV - sets output via resistor divider; enables precise 0.8V–VIN adjustment with <0.4% load regulation. |
| Thermal Shutdown | 145°C trip, 130°C restart - protects against sustained overload or poor PCB thermal design without latch-up. |
| Shutdown Current | <1µA - ensures negligible battery drain during system sleep or off-state. |
Pinout & Package
EL7531IY-T13 is housed in a RoHS-compliant, Pb-free 10-lead MSOP package (M10.118A), measuring 4.9mm × 3.0mm × 1.1mm max height, rated for -40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SGND | Signal Ground | Reference return for control circuitry; must be separated from PGND and joined at single point near IC. |
| 2 PGND | Power Ground | 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 1.2A peak current; layout critical for EMI and efficiency. |
| 4 VIN | Power Stage Input | Supplies high-side PMOS and low-side NMOS; requires local 10µF ceramic capacitor placed adjacent to pin. |
| 5 VDD | Controller Supply | Bias supply for internal logic and gate drivers; decoupled internally but benefits from 0.1µF local cap. |
| 6 SYNC | Mode Control / Sync Input | Selects auto PFM/PWM (GND), forced PWM (VIN), or external sync (1.6–12MHz); TTL-compatible thresholds. |
| 7 EN | Enable Input | Active-high logic input; 2.4V turn-on threshold ensures clean startup from Li-ion discharge curve. |
| 8 PG | Power-Good Output | Open-drain flag indicating VO within ±5% of target; requires external 100kΩ pull-up to VIN or VCC. |
| 9 VO | Output Sense | Direct connection to regulated output; used for remote sensing in high-current or long-trace applications. |
| 10 FB | Voltage Feedback | Connects to resistor divider (R1/R2); 800mV reference enables accurate output setting independent of load. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous FETs | 70mΩ PMOS + 45mΩ NMOS eliminates external MOSFETs and reduces BOM count and board area. |
| Auto PFM/PWM Transition | Seamlessly switches at ~250mA to maintain >70% efficiency down to 1mA load without manual mode control. |
| Internal Compensation | Fixed Type-II compensation enables stable operation with standard 1.5–2.2µH inductors and 10–22µF ceramic caps. |
| Power-Good Monitoring | Dedicated open-drain PG output simplifies system sequencing and fault detection without external comparators. |
| Ultra-Low Shutdown Current | <1µA shutdown draw extends shelf life and enables true zero-power standby in battery-critical systems. |
Applications
| Bar Code Readers | Li-Ion Powered Portable Instruments |
|---|---|
Use Scenario: Compact handheld scanners requiring regulated 1.8V or 3.3V from a single 3.7V Li-ion cell with minimal PCB real estate. IC Role / Device Role / Timing Role: Primary step-down regulator supplying microcontroller core voltage and imaging sensor bias rails. Use Value: 0.97 cm² total converter footprint and 120µA quiescent current enable all-day battery operation and pocket-sized form factor. |
Use Scenario: Portable test equipment (e.g., DMMs, oscilloscope probes) needing stable, low-noise 1.2V–3.3V supplies across varying battery SOC. IC Role / Device Role / Timing Role: Main DC/DC converter for analog front-end and digital processing subsystems with tight voltage tolerance. Use Value: ±0.4% load regulation and 800mV precision feedback ensure ADC reference stability and measurement repeatability. |
| Small Form Factor (SFP) Modules | Cellular Handset Baseband |
Use Scenario: Hot-pluggable optical transceiver modules where thermal headroom is limited and startup must tolerate pre-biased outputs. IC Role / Device Role / Timing Role: Point-of-load regulator for laser driver and serializer/deserializer ICs with fast transient response. Use Value: Soft-start (650µs) and PFM-to-PWM transition support pre-biased loads; 94% peak efficiency minimizes module temperature rise. |
Use Scenario: Power management in GSM/UMTS handsets where battery voltage drops from 4.2V to 3.0V during discharge. IC Role / Device Role / Timing Role: Core voltage regulator for application processor and baseband SoC with dynamic voltage scaling support. Use Value: 2.5V–5.5V input range covers full Li-ion discharge curve; 1.4MHz switching avoids AM radio band interference. |
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 shutdown; better suited for ultra-low-IQ applications where sequencing is handled externally. | Choose when lowest possible quiescent current is prioritized over fault reporting and thermal safety. |
| Analog Devices ADP2301ARMZ-R7 | 1.2A, 3.0–20V input, 700kHz fixed frequency, 2.5mA IQ, PG output, 8-pin SOIC. | Wider input range but higher IQ and larger SOIC package; lacks PFM mode and external sync capability. | Choose for industrial inputs >5.5V or where SOIC thermal mass is acceptable; not suitable for Li-ion or space-constrained designs. |
Compared with TPS62231DRYT and ADP2301ARMZ-R7, the EL7531IY-T13 uniquely balances ultra-low-light-load efficiency (120µA IQ), integrated fault protection (PG, OCP, OTP), and compact MSOP-10 packaging-making it optimal for battery-powered portable systems requiring reliability, small size, and wide input compatibility.
Availability
EL7531IY-T13 is available at Aetrix Electronics and suitable for bar code readers, Li-ion powered portable instruments, small form factor (SFP) modules, and cellular handset baseband applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for EL7531IY-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 Corporation is a leading provider of power management and precision analog solutions, acquired by Renesas Electronics in 2017 and now part of its Power Management Division.
The EL7531IY-T13 belongs to Intersil's monolithic DC/DC regulator product line, designed specifically for high-efficiency, low-noise, space-constrained power conversion in portable and battery-operated electronics.
FAQ
What is the minimum input voltage required for the EL7531IY-T13 to start switching?
The EL7531IY-T13 begins switching when VIN reaches approximately 2.4V under rising conditions, as defined by its VIN,ON specification. Below this threshold, the device remains in undervoltage lockout. This ensures reliable startup from partially discharged Li-ion cells while preventing erratic operation near brownout conditions. The EL7531IY-T13 maintains regulation down to 2.5V input during normal operation.
Does the EL7531IY-T13 require external compensation components?
No, the EL7531IY-T13 features fully internal compensation optimized for standard 1.5–2.2µH inductors and 10–22µF ceramic capacitors. No external compensation network is needed, simplifying design and reducing bill-of-materials cost. The internal Type-II compensator ensures stability across the full load and input voltage range without user tuning.
How does the Power-Good (PG) output of the EL7531IY-T13 behave during startup and fault conditions?
The EL7531IY-T13 PG pin is an open-drain output that pulls low when VO deviates by more than ±5% from the target setpoint, during EN deactivation, or under thermal/overcurrent fault. It transitions high only after soft-start completes and VO stabilizes within regulation. An external 100kΩ pull-up to VIN is required; the EL7531IY-T13 does not drive PG high actively.
Can the EL7531IY-T13 be synchronized to an external clock source, and what is the supported frequency range?
Yes, the EL7531IY-T13 accepts external synchronization on the SYNC pin across 1.6MHz to 12MHz. When driven by a clean CMOS-level clock, the regulator locks to the external frequency and operates in forced PWM mode. This capability enables EMI reduction through frequency dithering or alignment with system clocks, and is confirmed in the EL7531IY-T13 datasheet Figures 17 and 18.
What thermal performance can be expected from the EL7531IY-T13 in a typical 2-layer PCB layout?
In a standard 2-layer PCB with moderate copper area, the EL7531IY-T13 exhibits a junction-to-ambient thermal resistance (θJA) of approximately 125°C/W, allowing ~486mW power dissipation at 85°C ambient before reaching 125°C junction limit. Layout improvements-such as maximizing PGND copper, adding thermal vias under the exposed pad (if present), and using 4-layer boards-can reduce θJA to ~100°C/W per manufacturer guidance.
EL7531IY-T13 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-T13 FAQ
1.How can I place an order for EL7531IY-T13 through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7531IY-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 EL7531IY-T13 reliable?
The price and inventory of EL7531IY-T13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7531IY-T13 is usually 5 days.
3.What payment methods are accepted for EL7531IY-T13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7531IY-T13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7531IY-T13?
EL7531IY-T13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7531IY-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 EL7531IY-T13?
For technical support, including EL7531IY-T13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7531IY-T13 requirements.
6.How does Aetrix verify that EL7531IY-T13 is sourced from the original manufacturer or authorized distributors?
All EL7531IY-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 EL7531IY-T13 meets industry standards.
7.What is the process for return or replacement of EL7531IY-T13?
All EL7531IY-T13 units undergo pre-shipment inspection (PSI). If there is an issue with EL7531IY-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 EL7531IY-T13 part is unused and in its original packaging.
Return procedure for EL7531IY-T13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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