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Renesas EL7535IYZ
- Part No.:
- EL7535IYZ
- Manufacturer:
- Renesas
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
EL7535IYZ.pdf
- Description:
- IC REG BUCK ADJ 350MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,842
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Product details
Overview
EL7535IYZ from Intersil is a synchronous, integrated-FET 350mA step-down DC/DC regulator in a 10-lead MSOP package. It operates from 2.5V to 6V input, delivers adjustable output from 0.8V to VIN via external resistor divider, and features 1.4MHz PWM switching, <1µA shutdown current, and internal compensation enabling five-component designs. It powers Li-ion–based portable electronics requiring compact, efficient voltage conversion.
For engineers reviewing the EL7535IYZ datasheet, EL7535IYZ pinout, EL7535IYZ application, or EL7535IYZ equivalent, key selection criteria include its 350mA output capability, 10-lead MSOP thermal performance (θJA = 115°C/W on high-conductivity board), POR timing (100ms delay), and fixed-frequency voltage-mode control architecture.
Technical Context
The EL7535IYZ implements a voltage-mode PWM controller with fixed 1.4MHz oscillator and internally compensated error amplifier, eliminating need for external compensation components. Its synchronous dual-FET power stage integrates 70mΩ PMOS and 45mΩ NMOS switches, supporting continuous 350mA output with peak current limit at 1.5A.
It includes dedicated SGND and PGND pins for noise isolation, open-drain POR output with 100ms delay referenced to VFB threshold (97% of target), and RSI pin for asynchronous reset injection. Thermal shutdown activates at +145°C with +15°C hysteresis, ensuring safe recovery at +130°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 350mA continuous; supports stable operation under full load without derating on 4-layer PCB |
| Input Voltage Range | 2.5V to 6V; compatible with single-cell Li-ion (2.7–4.2V), 3.3V, and 5V rails |
| Switching Frequency | 1.4MHz typical; enables use of small 1.5–2.2µH inductors and 10–22µF ceramic capacitors |
| Feedback Voltage | 800mV ±20mV; sets output via resistor divider: VO = 0.8V × (1 + R1/R2) |
| Shutdown Current | <1µA; minimizes battery drain in standby mode for portable devices |
| Thermal Shutdown | Triggers at +145°C, releases at +130°C; protects against sustained overload or poor heatsinking |
| Efficiency | Up to 94% at 350mA; achieved with synchronous rectification and low RDS(ON) FETs |
Pinout & Package
EL7535IYZ is housed in a Pb-free, RoHS-compliant 10-lead MSOP package (MDP0043), measuring 3.0mm × 4.9mm × 1.1mm max height, with fused leads for improved thermal resistance (θJA = 115°C/W on JEDEC JESD51-7 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 |
| 3 (LX) | Switch node | Drives external inductor; carries high di/dt; must be routed short and wide to minimize EMI |
| 4 (VIN) | Power-stage input supply | Connects to input capacitor; supplies energy to internal PMOS/NMOS power stage |
| 5 (VDD) | Controller supply | Bias rail for internal logic and reference; decoupled separately from VIN |
| 6 (RSI) | Reset inhibit input | Active-HI signal that forces POR low immediately; used for system-level reset coordination |
| 7 (EN) | Enable control | Logic-level input; high ≥2.4V enables regulation, low ≤0.8V disables with <1µA quiescent draw |
| 8 (POR) | Open-drain Power-On Reset | Asserts low for 100ms after VO reaches regulation; requires external pull-up for active-HI Power-Good signaling |
| 9 (VO) | Output voltage sense | Direct connection to regulated output; used with FB for remote sensing in high-accuracy applications |
| 10 (FB) | Voltage feedback input | Monitors resistive divider; 800mV reference sets output; high-impedance (250nA bias) for minimal divider loading |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous integrated-FET topology | Eliminates external Schottky diode; reduces conduction loss and improves efficiency up to 94% |
| Internally compensated voltage-mode control | Enables complete 350mA DC/DC solution with only two 10µF ceramics, one 1.8µH inductor, and feedback resistors |
| Dual ground separation (SGND/PGND) | Minimizes noise coupling between sensitive analog control and noisy power switching paths |
| Programmable POR with RSI override | Provides deterministic 100ms system reset window and allows external reset injection without affecting regulation |
| Pb-free MSOP-10 with fused leads | Delivers θJA = 115°C/W on 4-layer board-25% lower than standard MSOP-enhancing thermal headroom |
Applications
| Bar Code Readers | Cellular Phones |
|---|---|
Use Scenario: Compact handheld scanners requiring regulated 1.8V or 2.5V rails from single Li-ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 350mA to image sensor and decode ASIC. Use Value: 1.4MHz switching enables miniature 1.8µH inductor and 10µF ceramic caps, reducing total solution size by >40% vs. lower-frequency alternatives. | Use Scenario: Main camera module power supply in feature phones with tight board space constraints. IC Role / Device Role / Timing Role: Adjustable-output buck converter powering CMOS image sensor at 2.8V from 3.3V or Li-ion source. Use Value: Internal compensation and dual-ground layout reduce layout sensitivity, accelerating design validation for high-volume production. |
| Portable Test Equipment | Small Form Factor (SFP) Modules |
Use Scenario: Battery-powered handheld multimeters needing stable 3.3V rail for MCU and ADC during measurement bursts. IC Role / Device Role / Timing Role: Efficient 350mA regulator with <1µA shutdown, enabling multi-week battery life in sleep mode. Use Value: POR output provides clean MCU reset synchronized to output regulation, eliminating need for external supervisor IC. | Use Scenario: Optical transceiver modules requiring 1.8V/3.3V rails within 14.5mm × 10.2mm SFP footprint. IC Role / Device Role / Timing Role: Space-constrained secondary regulator converting 3.3V host supply to 1.8V laser driver bias. Use Value: 10-lead MSOP package (3.0 × 4.9 mm) fits within SFP keep-out zones while delivering full 350mA with no thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL80019 | 300mA output, 2.7–5.5V input, 3MHz switching, different pinout (8-pin SOIC) | Lacks POR/RSI functions; not pin-compatible; requires redesign of feedback and layout | Choose when higher frequency (3MHz) and smaller inductor are prioritized over reset functionality and MSOP footprint |
| ISL80019A | Same specs as ISL80019 but with improved ESD rating and tighter VFB tolerance (±1%) | No POR/RSI; same pinout mismatch; also lacks dual-ground separation | Select only if enhanced VFB accuracy and ESD robustness outweigh loss of integrated reset and layout advantages of EL7535IYZ |
Compared with ISL80019 and ISL80019A, the EL7535IYZ offers unique integration of POR/RSI, dual-ground architecture, and MSOP-10 thermal performance-enabling simpler, more reliable designs in space- and reset-critical portable systems.
Availability
EL7535IYZ is available at Aetrix Electronics and suitable for bar code readers, cellular phones, and portable test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for EL7535IYZ 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, serving industrial, mobile computing, and high-end consumer markets with ISO9001-certified manufacturing.
The EL7535IYZ belongs to Intersil's monolithic DC/DC regulator product line, designed specifically for compact, battery-powered portable electronics demanding high efficiency, minimal external components, and integrated system-level functions like POR.
FAQ
What is the maximum continuous output current supported by the EL7535IYZ?
The EL7535IYZ supports 350mA continuous output current across the full -40°C to +85°C operating temperature range when mounted on a 4-layer PCB with adequate copper area. Its 1.5A current limit and thermal shutdown at +145°C provide headroom for transient loads, but sustained operation above 350mA requires thermal derating per the θJA = 115°C/W specification shown in the datasheet.
Does the EL7535IYZ require external compensation components?
No, the EL7535IYZ does not require external compensation components. It features an internally compensated voltage-mode PWM controller optimized for 10–22µF ceramic input/output capacitors and 1.5–2.2µH inductors. This allows a complete 350mA DC/DC converter using only five passive components: two capacitors, one inductor, and two feedback resistors-reducing BOM count and layout complexity.
How does the POR function work on the EL7535IYZ, and can it be disabled?
The EL7535IYZ POR output goes low for 100ms after the output voltage reaches regulation, based on the FB pin reaching 97% of its 800mV target. It can be disabled by leaving the POR pin unconnected or floating; however, to avoid noise susceptibility, Intersil recommends connecting R4 (100kΩ pull-up) only if POR functionality is needed. When unused, RSI should be tied to ground and the POR pull-up omitted.
What are the critical PCB layout requirements for stable operation of the EL7535IYZ?
Critical layout requirements for the EL7535IYZ include strict separation of SGND and PGND with single-point connection near the IC, placement of the input capacitor directly between VIN and PGND pins, minimizing trace length for LX-to-inductor and output-capacitor-to-PGND paths, and routing the FB trace away from noisy nodes. Additionally, maximizing copper area and adding multiple thermal vias under PGND significantly improves thermal performance and ripple suppression.
Is the EL7535IYZ pin-compatible with the ISL80019 or ISL80019A?
No, the EL7535IYZ is not pin-compatible with the ISL80019 or ISL80019A. The EL7535IYZ uses a 10-lead MSOP package with dedicated SGND, PGND, RSI, and POR pins, while the ISL80019/A use an 8-pin SOIC package without RSI or POR functionality. Substituting either ISL part requires full schematic and layout revision-including changes to feedback network, grounding scheme, and reset signaling.
EL7535IYZ 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):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 350mA
- 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
EL7535IYZ FAQ
1.How can I place an order for EL7535IYZ through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7535IYZ 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 EL7535IYZ reliable?
The price and inventory of EL7535IYZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7535IYZ is usually 5 days.
3.What payment methods are accepted for EL7535IYZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7535IYZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7535IYZ?
EL7535IYZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7535IYZ 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 EL7535IYZ?
For technical support, including EL7535IYZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7535IYZ requirements.
6.How does Aetrix verify that EL7535IYZ is sourced from the original manufacturer or authorized distributors?
All EL7535IYZ 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 EL7535IYZ meets industry standards.
7.What is the process for return or replacement of EL7535IYZ?
All EL7535IYZ units undergo pre-shipment inspection (PSI). If there is an issue with EL7535IYZ, 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 EL7535IYZ part is unused and in its original packaging.
Return procedure for EL7535IYZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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