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Renesas EL7531IY
- Part No.:
- EL7531IY
- Manufacturer:
- Renesas
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
EL7531IY.pdf
- Description:
- IC REG BUCK ADJ 1A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,556
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Product details
Overview
EL7531IY 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 from 0.8V to VIN. It features automatic PFM/PWM mode switching, 1.4MHz nominal PWM frequency (synchronizable up to 12MHz), 120µA no-load quiescent current, and Power-Good (PG) open-drain output. It targets compact Li-Ion–powered portable electronics requiring high efficiency at light load and stable regulation under dynamic loads.
For engineers reviewing the EL7531IY datasheet, EL7531IY pinout, EL7531IY application, or EL7531IY equivalent, key selection considerations include its MSOP10 package footprint (<0.15 in² total converter area), dual-mode control architecture, PG signal timing behavior, thermal shutdown thresholds (145°C trip / 130°C hysteresis), and verified 94% peak efficiency at 1A with 1.8µH inductor and ceramic capacitors.
Technical Context
The EL7531IY implements a voltage-mode PWM controller with fixed internal compensation, eliminating external loop components. Its dual-mode operation-PFM at light loads (<250mA) and forced/synchronized PWM at higher loads-enables >70% efficiency at 1mA while maintaining tight line/load regulation (±0.1%–±0.4%) across -40°C to +85°C ambient.
It integrates complementary PMOS (70mΩ typical RDS(ON)) and NMOS (45mΩ typical RDS(ON)) power switches, soft-start (650µs), overcurrent protection (1.5A limit), and thermal shutdown with hysteresis. The PG output asserts high only when VFB reaches ≥95% of target and remains within ±5% during regulation.
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 - sustains full rated load with ≤1.1mm profile in MSOP10, validated with 1.8µH inductor and 10µF ceramic caps. |
| Switching Frequency | 1.4MHz typical (1.25–1.6MHz range), synchronizable to 1.6–12MHz - enables EMI reduction via external clock alignment. |
| Quiescent Current | 120µA in PFM mode - extends battery runtime in always-on low-power states (e.g., standby in barcode readers). |
| Feedback Voltage | 800mV ±10mV - sets output via resistor divider; enables precise 0.8V–VIN adjustment with <0.3% tempco drift. |
| Power-Good Threshold | 95% VFB rising / 86% VFB falling - provides reliable system sequencing and fault detection with 35–70mV sink capability. |
| Thermal Protection | 145°C shutdown / 130°C restart - prevents latch-up during sustained overload or poor PCB thermal design. |
| Shutdown Current | <1µA - ensures negligible battery drain when EN is pulled low in deep-sleep modes. |
Pinout & Package
EL7531IY is housed in a RoHS-compliant 10-lead MSOP package (M10.118A), measuring 4.9mm × 3.0mm × 1.1mm max height, specified for -40°C to +85°C operation. The fused-lead construction delivers θJA = 115°C/W (4-layer board) and supports one-side PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SGND) | Signal Ground Reference | Return path for controller-stage circuitry; must be isolated from PGND and joined at single point near FB/VO pins. |
| 2 (PGND) | Power Ground Reference | Return path for high-current LX switching node; requires large copper pour and multiple vias for thermal/EMI control. |
| 3 (LX) | Switch Node Output | Drives external inductor; carries pulsed 1.2A peak current; layout minimization critical to reduce ringing and EMI. |
| 4 (VIN) | Main Power Input | Supplies power stage (PMOS/NMOS); accepts 2.5–5.5V; requires local 10µF ceramic cap placed adjacent to VIN/PGND. |
| 5 (VDD) | Controller Supply | Provides bias to internal logic and reference; decoupled internally; not externally accessible for bypassing. |
| 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 shaping. |
| 7 (EN) | Enable Input | Active-high logic input; 2.4V turn-on threshold; enables soft-start and disables all switching with <1µA shutdown current. |
| 8 (PG) | Power-Good Open-Drain | Asserts high (via external pull-up) only when output is within ±5% regulation; sinks 3.3mA max for fault indication. |
| 9 (VO) | Output Voltage Sense | Direct connection to regulated output; used with FB to form feedback loop; routed away from noisy LX traces. |
| 10 (FB) | Voltage Feedback Input | Monitors resistive divider (R1/R2); 800mV reference sets VOUT = 0.8V × (1 + R1/R2); 100nA input bias enables high-R dividers. |
Key Features
| Feature | Design Value |
|---|---|
| One-Side PCB Layout | Entire 1A converter fits on top side only - eliminates via stitching complexity and reduces assembly cost in space-constrained modules. |
| Internally Compensated Control | No external compensation components required - simplifies BOM, improves production yield, and guarantees stability with recommended 1.5–2.2µH inductors. |
| PFM/PWM Auto-Transition | Seamless switch at ~250mA load - maintains >70% efficiency at 1mA while avoiding audible noise and enabling fast transient response above 250mA. |
| Low-Profile MSOP10 Package | 1.1mm max height - enables integration into ultra-thin handhelds (e.g., SFP modules, pocket PCs) without mechanical interference. |
| Robust Protection Suite | Integrated short-circuit (1.5A limit), overtemperature (145°C/130°C hysteresis), and undervoltage lockout - eliminates need for discrete protection ICs. |
| Pb-Free RoHS Compliance | M10.118A package with 100% matte tin terminations - compatible with SnPb and Pb-free reflow profiles per J-STD-020. |
Applications
| Li-Ion–Powered Handhelds | Barcode Scanners |
|---|---|
|
Use Scenario: Portable barcode scanner powered by single-cell Li-Ion (3.0–4.2V), requiring 1.8V/1A for image sensor and decoder ASIC with intermittent 500ms burst loads. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.8V rail; PG signal sequences sensor power-up after battery insertion; SYNC pin tied to MCU clock for EMI compliance. Use Value: 94% efficiency at 1A and 120µA quiescent current extend battery life beyond 8 hours; MSOP10 footprint allows placement directly beneath sensor module. |
Use Scenario: Industrial-grade handheld barcode reader with cold-temperature operation (-20°C) and USB-powered firmware updates. IC Role / Device Role / Timing Role: Core power supply for CMOS imager and microcontroller; EN controlled by host USB enumeration; PG confirms regulation before enabling laser driver. Use Value: Validated -40°C to +85°C operation ensures reliability in warehouse environments; PFM mode maintains >75% efficiency at 10mA standby current. |
| Small Form Factor Modules | Portable Test Equipment |
|
Use Scenario: SFP+ optical transceiver module requiring compact, low-noise 3.3V rail derived from 5V backplane, with strict EMI limits. IC Role / Device Role / Timing Role: Secondary regulator generating clean 3.3V from 5V; SYNC driven by 5MHz system clock to shift switching harmonics away from data bands. Use Value: 12MHz synchronization capability enables precise EMI notch placement; <0.15 in² footprint meets SFP+ mechanical envelope constraints. |
Use Scenario: Battery-operated handheld oscilloscope with analog front-end (1.2V), FPGA (1.0V), and display (3.3V) rails. IC Role / Device Role / Timing Role: One of multiple EL7531IY instances generating individual rails; PG outputs feed FPGA power-good arbiter; soft-start prevents inrush into shared input cap. Use Value: Independent soft-start (650µs) and PG signaling enable safe, sequenced power-up of mixed-voltage subsystems without external controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | 3MHz fixed-frequency PWM only; 25µA IQ; 600mA output; 6-pin WSON package | Lacks PFM mode, PG output, and 1A rating; suited for lower-current, higher-frequency designs where size is paramount | Select when board space is tighter than 4.9×3.0mm and load never exceeds 600mA; avoid if PG sequencing or Li-Ion discharge curve support is required |
| RT8059NGSP | 2MHz PWM-only; 30µA IQ; 1A output; 8-pin SOIC package; no PG or SYNC | Higher profile (1.75mm), no mode auto-switching or synchronization; lacks power-good signaling for system safety | Choose for cost-sensitive industrial applications where EMI control and startup sequencing are non-critical; verify thermal performance on 2-layer boards |
Compared with TPS62231DRYT and RT8059NGSP, EL7531IY uniquely combines 1A capability, PFM/PWM auto-transition, PG output, and 12MHz sync in an ultra-low-profile MSOP10 - making it optimal for battery-powered portable systems demanding both efficiency across load range and robust system-level power management.
Availability
EL7531IY is available at Aetrix Electronics and suitable for Li-Ion–powered handhelds, barcode scanners, small form factor modules, and portable test equipment requiring stable component supply with guaranteed long-term sourcing.
Supply support for EL7531IY 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 precision analog and power management specialist, now part of Renesas Electronics, delivering high-reliability solutions for industrial, infrastructure, and mobile computing markets.
The EL7531IY belongs to Intersil's monolithic DC-DC regulator product line, engineered specifically for space-constrained, battery-operated portable electronics needing high light-load efficiency, fast transient response, and minimal external components.
FAQ
What is the minimum input voltage required for EL7531IY to start switching?
The EL7531IY begins switching when VIN rises above 2.2V to 2.4V (startup threshold). Below 2.2V, the device remains in shutdown regardless of EN state. This ensures reliable operation across the full Li-Ion discharge curve (3.0V–4.2V) and compatibility with 3.3V and 5V supplies. The EL7531IY will not initiate soft-start until this threshold is met.
Does EL7531IY require external compensation components?
No, the EL7531IY features an internally compensated voltage-mode controller optimized for 1.5µH to 2.2µH inductors and 10µF to 22µF ceramic capacitors. Adding external compensation risks instability and violates the validated design window documented in FN7428. The EL7531IY achieves guaranteed phase margin and transient response without any external compensation network.
How does the Power-Good (PG) output behave during startup and fault conditions?
The PG pin is an open-drain output that remains low until VFB rises to ≥95% of its 800mV target and stays within ±5% of regulation. During startup, PG asserts high only after soft-start completes and output settles. If VFB drops below 86% of target (e.g., due to overload or short), PG pulls low within microseconds. The EL7531IY requires an external 100kΩ pull-up to VIN or VCC for proper PG functionality.
Can EL7531IY synchronize to a 10MHz external clock?
Yes, the EL7531IY accepts external synchronization signals from 1.6MHz to 12MHz, including 10MHz. When SYNC is driven by a clean CMOS-level clock, the EL7531IY locks its PWM frequency precisely to that source, eliminating beat frequencies and enabling EMI filtering at known harmonics. Pulse width must exceed 25ns, and signal integrity must be maintained to prevent jitter-induced output ripple.
What thermal derating applies to EL7531IY on a standard 2-layer PCB?
On a 2-layer board, the EL7531IY exhibits θJA ≈ 125°C/W. At 85°C ambient and 1A load, junction temperature rise is ~125°C, exceeding the 125°C absolute maximum. Derating is required: maximum continuous output current drops to ~600mA. To sustain 1A, use a 4-layer board (θJA = 115°C/W) with enhanced PGND copper and thermal vias - validated in FN7428 Figure 8.
EL7531IY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for EL7531IY through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7531IY 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 reliable?
The price and inventory of EL7531IY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7531IY is usually 5 days.
3.What payment methods are accepted for EL7531IY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7531IY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7531IY?
EL7531IY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7531IY 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?
For technical support, including EL7531IY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7531IY requirements.
6.How does Aetrix verify that EL7531IY is sourced from the original manufacturer or authorized distributors?
All EL7531IY 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 meets industry standards.
7.What is the process for return or replacement of EL7531IY?
All EL7531IY units undergo pre-shipment inspection (PSI). If there is an issue with EL7531IY, 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 part is unused and in its original packaging.
Return procedure for EL7531IY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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