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Renesas EL7531IYZ-T13
- Part No.:
- EL7531IYZ-T13
- Manufacturer:
- Renesas
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
EL7531IYZ-T13.pdf
- Description:
- IC REG BUCK ADJ 1A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,469
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Product details
Overview
EL7531IYZ-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) 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 serves as the primary voltage rail converter in space-constrained Li-Ion–powered portable electronics.
For engineers reviewing the EL7531IYZ-T13 datasheet, EL7531IYZ-T13 pinout, EL7531IYZ-T13 application, or EL7531IYZ-T13 equivalent, key selection criteria include its MSOP-10 footprint (<0.15 in²), thermal shutdown threshold (145°C), PG output behavior, PFM-to-PWM transition point (~250mA), and fixed internal compensation requiring specific 1.5–2.2µH inductor and 10–22µF ceramic capacitor values.
Technical Context
The EL7531IYZ-T13 implements a voltage-mode synchronous buck controller with integrated PMOS/NMOS power FETs (RDS(ON) = 70mΩ / 45mΩ), internally compensated error amplifier, and dual-loop operation: discontinuous-conduction PFM at light loads (<250mA) for >70% efficiency at 1mA, and continuous-conduction PWM above that threshold. Its SYNC pin enables forced PWM or external synchronization (1.6–12MHz), directly affecting EMI profile and transient response.
It integrates protection functions including cycle-by-cycle current limiting (1.5A typical), over-temperature shutdown (145°C trip, 130°C hysteresis), short-circuit foldback, and <1µA shutdown current. The separate SGND and PGND pins enforce clean signal/power ground separation, while the open-drain 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 or RF subsystems in handheld devices; peak current limit 1.5A prevents damage during overload. |
| Quiescent Current | 120µA in PFM mode - enables multi-week battery life in always-on sensor nodes or standby circuits. |
| PWM Frequency | 1.25–1.6MHz (typ 1.4MHz) - balances efficiency, inductor size, and EMI; externally synchronizable up to 12MHz for noise-sensitive applications. |
| Feedback Voltage | 800mV ±10mV - sets output via resistor divider; tight tolerance ensures ±1% output accuracy across temperature (-40°C to +85°C). |
| Thermal Shutdown | 145°C trip / 130°C hysteresis - protects against sustained overload or poor PCB thermal design; auto-recovery avoids manual reset. |
| Power-Good Threshold | VFB ≥95% of target for assertion, ≤86% for deassertion - provides reliable system power sequencing and fault detection. |
Pinout & Package
EL7531IYZ-T13 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. Thermal resistance θJA is 115°C/W on high-conductivity board, 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 joined at single point near FB/EN pins to avoid noise coupling. |
| 2 (PGND) | Power Ground Return | High-current return for LX and VIN; requires large copper pour and multiple vias to minimize IR drop and thermal rise. |
| 3 (LX) | Switch Node | Drives external inductor; carries high di/dt; must be routed short and wide to reduce EMI and voltage spikes. |
| 4 (VIN) | Main Power Input | Supplies power stage (PMOS/NMOS); requires low-ESR 10µF ceramic cap placed adjacent to PIN 4 and PIN 2. |
| 5 (VDD) | Controller Supply | Bias supply for internal logic; decoupled by 0.1µF capacitor between PIN 5 and SGND. |
| 6 (SYNC) | Mode Control & Sync Input | Ground = auto PFM/PWM; VIN = forced PWM; external clock (1.6–12MHz) = synchronized PWM for EMI reduction. |
| 7 (EN) | Enable Input | Active-high logic input; rising threshold 2.4V, falling 1.4V; <1µA shutdown current enables zero-power state. |
| 8 (PG) | Power-Good Output | Open-drain NMOS; requires 100kΩ pull-up to VIN; asserts high only when output is regulated within ±5% and EN is active. |
| 9 (VO) | Output Voltage Sense | Direct connection to output capacitor; used with FB to form feedback loop; sensitive to trace impedance. |
| 10 (FB) | Feedback Input | Monitors resistor divider ratio; 800mV reference enables precise output setting; input bias current <100nA minimizes divider error. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous FETs | Eliminates need for external MOSFETs and gate drivers; reduces BOM count and layout complexity while maintaining 94% peak efficiency. |
| Automatic PFM/PWM Transition | Optimizes light-load efficiency (>70% at 1mA) without requiring external mode control logic or firmware intervention. |
| Internal Compensation | Removes external compensation network; restricts inductor/capacitor selection to 1.5–2.2µH and 10–22µF but simplifies design validation. |
| Power-Good Monitoring | Provides system-level power sequencing and fault indication without external supervisor IC, reducing component count and board area. |
| Thermal & Overcurrent Protection | Self-protecting operation under fault conditions prevents catastrophic failure; hysteresis ensures stable restart after cooling. |
Applications
| Li-Ion–Powered Handheld Devices | Portable Test Equipment |
|---|---|
Use Scenario: Powering ARM Cortex-M microcontrollers and display drivers in barcode scanners with 3.7V nominal Li-Ion battery. IC Role / Device Role / Timing Role: Primary 1.8V/1A buck regulator supplying core logic voltage; manages dynamic load steps from 0.1A to 1A during scan bursts. Use Value: 120µA quiescent current extends battery runtime in sleep mode; PFM mode maintains >75% efficiency at 10mA idle current. |
Use Scenario: Generating stable 3.3V rail for mixed-signal data acquisition circuits in handheld oscilloscopes. IC Role / Device Role / Timing Role: Low-noise, high-PSRR intermediate regulator feeding ADC reference and analog front-end stages. Use Value: 1.4MHz fixed-frequency PWM minimizes beat frequencies with sampling clocks; PG output validates rail integrity before measurement capture. |
| Small Form Factor Modules | Cellular Phone Subsystems |
Use Scenario: Providing 1.2V core voltage to FPGA fabric in SFP+ transceiver modules with strict 0.15 in² board area constraint. IC Role / Device Role / Timing Role: Compact, one-side-only power solution replacing discrete buck controllers and external FETs. Use Value: MSOP-10 package and integrated FETs achieve full 1A converter in <0.15 in²; 1.1mm height meets module Z-height limits. |
Use Scenario: Supplying 2.5V I/O voltage to baseband processor in GSM/UMTS handsets powered by single-cell Li-Ion. IC Role / Device Role / Timing Role: Secondary buck regulator supporting dynamic voltage scaling (DVS) during call processing and idle states. Use Value: SYNC pin enables synchronization to baseband clock domain, suppressing conducted EMI in RF-sensitive bands. |
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 TPS62231DRYR | 3MHz fixed-frequency PWM only; 20µA IQ; 600mA output; 6-pin WSON package. | Limited to lower current and no PFM mode; better suited for ultra-low-IQ always-on sensors than 1A burst loads. | Select when minimum quiescent current (20µA) and small 2mm × 2mm footprint outweigh need for 1A output and PFM efficiency. |
| Analog Devices ADP2301ARMZ-R7 | Fixed 1.4MHz PWM; 1.2A output; external compensation; 8-pin SOIC package; 2.5µA shutdown current. | Requires external compensation components and larger SOIC footprint; lacks PG output and auto PFM. | Choose when design flexibility (adjustable compensation, wider inductor/capacitor range) and higher current margin justify added BOM and layout effort. |
Compared with TPS62231DRYR and ADP2301ARMZ-R7, the EL7531IYZ-T13 uniquely combines 1A capability, integrated PFM/PWM auto-transition, Power-Good signaling, and MSOP-10 compactness-making it optimal for space-constrained, battery-powered systems requiring both light-load efficiency and robust transient response.
Availability
EL7531IYZ-T13 is available at Aetrix Electronics and suitable for Li-Ion–powered handheld devices, portable test equipment, and small-form-factor optical modules requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for EL7531IYZ-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 (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-T13 belongs to Intersil's monolithic synchronous buck regulator product line, designed specifically for space- and efficiency-critical portable electronics where minimal external components, low quiescent current, and robust protection are mandatory.
FAQ
What is the recommended inductor value for EL7531IYZ-T13 in a standard 1.8V@1A application?
The EL7531IYZ-T13 requires an inductor between 1.5µH and 2.2µH for stable operation with internal compensation. For a 1.8V/1A output from 3.3V input, a 1.8µH shielded power inductor with ≥2A saturation current and ≤75mΩ DCR is recommended per the datasheet's Typical Application Diagram. This value balances ripple current, efficiency, and transient response while ensuring compatibility with the fixed compensation network.
Does EL7531IYZ-T13 support pre-biased output startup?
Yes, the EL7531IYZ-T13 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 ensures controlled ramp-up even when VO is non-zero at EN assertion - a critical feature for hot-swap or multi-rail sequencing applications using EL7531IYZ-T13.
How does the Power-Good (PG) output of EL7531IYZ-T13 behave during thermal shutdown?
During thermal shutdown, the EL7531IYZ-T13 disables both power FETs and halts switching, causing VO to collapse. As VFB falls below 86% of 800mV, the PG pin is actively pulled low by its internal NMOS. PG remains low until VO recovers to within regulation bounds (VFB ≥95% of 800mV) after thermal recovery and successful restart - providing unambiguous system-level fault indication for EL7531IYZ-T13 deployments.
Can EL7531IYZ-T13 be synchronized to a 10MHz clock source?
Yes, the EL7531IYZ-T13 accepts external synchronization from 1.6MHz up to 12MHz, so a 10MHz clock is fully supported. When driven by a clean 10MHz square wave applied to the SYNC pin, the device locks its PWM frequency precisely to 10MHz, eliminating switching frequency harmonics and easing EMI filtering in noise-sensitive applications such as RF front-ends or high-resolution ADC supplies using EL7531IYZ-T13.
What is the maximum allowable voltage on the EN pin of EL7531IYZ-T13?
The EN pin of EL7531IYZ-T13 tolerates voltages from –0.3V to (VIN + 0.3V), per Absolute Maximum Ratings. Since VIN operates up to 5.5V, EN may safely swing to 5.8V. However, the functional high threshold is 2.4V (min) at VDD = 3.3V, and the pin draws <1µA, making direct connection to VIN or a 3.3V logic rail appropriate - no level-shifting required for standard microcontroller GPIO control of EL7531IYZ-T13 enable/disable.
EL7531IYZ-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:
- 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-T13 FAQ
1.How can I place an order for EL7531IYZ-T13 through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7531IYZ-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 EL7531IYZ-T13 reliable?
The price and inventory of EL7531IYZ-T13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7531IYZ-T13 is usually 5 days.
3.What payment methods are accepted for EL7531IYZ-T13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7531IYZ-T13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7531IYZ-T13?
EL7531IYZ-T13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7531IYZ-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 EL7531IYZ-T13?
For technical support, including EL7531IYZ-T13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7531IYZ-T13 requirements.
6.How does Aetrix verify that EL7531IYZ-T13 is sourced from the original manufacturer or authorized distributors?
All EL7531IYZ-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 EL7531IYZ-T13 meets industry standards.
7.What is the process for return or replacement of EL7531IYZ-T13?
All EL7531IYZ-T13 units undergo pre-shipment inspection (PSI). If there is an issue with EL7531IYZ-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 EL7531IYZ-T13 part is unused and in its original packaging.
Return procedure for EL7531IYZ-T13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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