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Renesas EL7534IY-T7
- Part No.:
- EL7534IY-T7
- Manufacturer:
- Renesas
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
EL7534IY-T7.pdf
- Description:
- IC REG BUCK ADJ 600MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,432
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Product details
Overview
EL7534IY-T7 from Intersil is a synchronous, integrated-FET 600mA 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 1.5MHz PWM switching, <1µA shutdown current, 100ms open-drain POR output, and over-temperature/short-circuit protection in a 10-lead MSOP package. Used in Li-ion–powered portable electronics requiring compact, high-efficiency power conversion.
For engineers reviewing the EL7534IY-T7 datasheet, EL7534IY-T7 pinout, EL7534IY-T7 application, or EL7534IY-T7 equivalent, key selection considerations include its internally compensated voltage-mode control architecture, dual ground separation (PGND/SGND), 70mΩ PMOS + 45mΩ NMOS RDS(ON), 94% peak efficiency at 600mA, and thermal shutdown at 145°C with 15°C hysteresis.
Technical Context
The EL7534IY-T7 implements a fixed-frequency voltage-mode PWM controller with internal compensation, eliminating external loop components. Its synchronous rectification uses complementary PMOS/NMOS FETs (70mΩ/45mΩ typical) enabling 100% duty-cycle operation near VIN and eliminating boot capacitor requirements.
It integrates a bandgap reference, soft-start (650µs), POR with 100ms delay and active-HI RSI reset, and thermal shutdown with automatic restart at 130°C. The dual-ground architecture (PGND for power stage, SGND for control logic) minimizes noise coupling and supports stable regulation under transient load steps up to 400mA/50µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 600mA continuous; supports 800mA peak for short transients without derating |
| Input Voltage Range | 2.5V to 5.5V; compatible with single-cell Li-ion (2.7–4.2V), 3.3V, and 5V rails |
| Switching Frequency | 1.5MHz typical; enables use of small 1.5–2.2µH inductors and 10–22µF ceramic capacitors |
| Feedback Voltage | 800mV ±10mV; sets output via resistor divider (VO = 0.8V × (1 + R1/R2)) |
| Shutdown Current | <1µA; enables ultra-low-power system sleep modes without external disconnect |
| Thermal Protection | Shuts down at 145°C junction; auto-restarts at 130°C; prevents permanent damage during overload |
| Power-On Reset | Open-drain POR output held low for 100ms after VO reaches target; provides reliable system initialization |
Pinout & Package
EL7534IY-T7 is housed in a 10-lead MSOP package (MDP0043), 3.0mm × 4.9mm × 1.1mm max height, RoHS-compliant with matte tin terminations. Thermal resistance θJA is 115°C/W on high-conductivity PCB and 206°C/W on low-conductivity board.
| 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 | High-current return path for LX and VIN; requires large copper pour and multiple vias for thermal management |
| 3 (LX) | Switch Node | Drives external inductor; carries high di/dt; must be routed short and wide to minimize EMI and voltage spikes |
| 4 (VIN) | Power Input | Supplies power stage (PMOS/NMOS); requires local 10µF ceramic capacitor placed adjacent to PIN 4 and PIN 2 |
| 5 (VDD) | Controller Supply | Bias supply for internal logic; derived from VIN but regulated internally; decoupled via 0.1µF capacitor |
| 6 (RSI) | Reset Input | Active-HI signal that forces immediate POR assertion; pulled low via 100kΩ resistor when unused |
| 7 (EN) | Enable Input | Active-HI logic control; starts soft-start when rising above 2.4V; draws <1µA in shutdown |
| 8 (POR) | Power-On Reset Output | Open-drain output; pulled up externally; asserts low for 100ms after valid VO is established |
| 9 (VO) | Output Sense | Direct connection to output capacitor; used for remote sensing if trace resistance is significant |
| 10 (FB) | Feedback Input | Connects to resistor divider midpoint; 250nA bias current enables high-impedance divider design |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates need for external compensation network; ensures stability with 10–22µF ceramic output caps and 1.5–2.2µH inductor |
| Synchronous MOSFET integration | 70mΩ PMOS + 45mΩ NMOS switches reduce conduction loss and enable >94% efficiency at 600mA |
| Dual ground separation | Independent PGND (power) and SGND (signal) pins prevent switching noise from corrupting feedback and control signals |
| 100% duty-cycle capability | PMOS upper switch allows VO to track VIN closely (e.g., 4.8V out from 4.9V input), critical for battery end-of-discharge operation |
| Integrated POR with RSI | Provides deterministic 100ms system reset window and user-triggered reset without external logic or timing components |
Applications
| PDA & Pocket PC Power | Bar Code Reader Core Supply |
|---|---|
|
Use Scenario: Powering ARM-based application processors and memory subsystems in handheld PDAs with Li-ion battery input (2.7–4.2V). IC Role / Device Role / Timing Role: Primary 1.8V/600mA step-down regulator supplying core logic voltage; delivers clean, low-noise output with fast transient response. Use Value: Enables full-system operation down to 2.5V input while maintaining 92% efficiency at 400mA, extending battery runtime by >15% versus non-synchronous alternatives. |
Use Scenario: Generating stable 3.3V rail for laser diode drivers and CMOS image sensors in handheld bar code scanners. IC Role / Device Role / Timing Role: Main DC/DC converter providing regulated 3.3V at up to 600mA; POR output synchronizes microcontroller boot sequence with sensor initialization. Use Value: 100ms POR ensures reliable firmware execution before sensor data acquisition begins, eliminating startup glitches in scan decode logic. |
| Cellular Phone Baseband | SFP Module Bias Supply |
|
Use Scenario: Supplying 1.2V core voltage to baseband SoCs in 2G/3G feature phones operating from single-cell Li-ion. IC Role / Device Role / Timing Role: High-efficiency buck regulator with EN-controlled sequencing; soft-start prevents inrush current during RF section power-up. Use Value: <1µA shutdown current preserves battery charge during standby; 1.5MHz switching avoids interference with GSM/EDGE RF bands (900/1800MHz). |
Use Scenario: Providing 2.5V bias for laser driver ICs and post-amplifiers in SFP optical transceivers with strict size constraints. IC Role / Device Role / Timing Role: Compact 600mA regulator occupying <0.15 in² PCB area; MSOP10 footprint fits within tight SFP module keep-out zones. Use Value: 1.1mm max height and one-side component placement meet SFP MSA mechanical specifications while delivering 93% efficiency at 500mA. |
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 switching frequency, 300mA output, different pinout (6-pin WSON), no integrated POR | Lacks POR and RSI functions; requires external reset IC for system initialization | Choose when higher frequency (3MHz) and smaller inductor are prioritized over POR integration and 600mA capability |
| RT8059NGSP | 2.5MHz frequency, 600mA rating, 12-pin QFN, includes enable and power-good but no POR | Requires external RC network for reset timing; lacks 100ms guaranteed POR delay | Prefer when QFN thermal performance is critical and POR can be implemented externally with discrete logic |
Compared with TPS62231DRYT and RT8059NGSP, the EL7534IY-T7 uniquely integrates a factory-trimmed 100ms POR with active-HI RSI trigger in an MSOP10 package-enabling simpler, more reliable system boot sequencing without additional components or layout complexity.
Availability
EL7534IY-T7 is available at Aetrix Electronics and suitable for PDA power systems, bar code reader designs, cellular phone baseband supplies, SFP module biasing, and Li-ion–powered portable test equipment requiring stable component supply across industrial temperature ranges.
Supply support for EL7534IY-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 U.S.-based analog and power management semiconductor manufacturer known for high-performance DC/DC regulators, precision amplifiers, and interface ICs.
The EL7534 belongs to Intersil's monolithic synchronous buck regulator product line, designed specifically for space-constrained, battery-powered portable electronics demanding high efficiency, low quiescent current, and integrated system-level functions like POR.
FAQ
What is the maximum output voltage achievable with EL7534IY-T7?
The EL7534IY-T7 supports output voltages from 0.8V up to VIN (input voltage), enabled by its 100% duty-cycle capability using an integrated PMOS high-side switch. For example, with VIN = 4.9V, VO can reach ~4.8V (accounting for RDS(ON) and inductor DCR losses). This makes EL7534IY-T7 suitable for applications where output must track input closely, such as Li-ion battery end-of-discharge operation.
Does EL7534IY-T7 require external compensation components?
No, EL7534IY-T7 features an internally compensated voltage-mode PWM controller. Its compensation network is fully integrated, allowing stable operation with only two 10–22µF ceramic capacitors and a 1.5–2.2µH inductor-no external resistors, capacitors, or op-amps are needed for loop stability. This simplifies design, reduces BOM count, and improves reliability versus externally compensated regulators.
How does the RSI pin function on EL7534IY-T7?
The RSI (Reset Input) pin on EL7534IY-T7 is an active-HI signal that immediately forces the POR output low upon assertion, then holds it low for a full 100ms after RSI returns low. This provides deterministic system reset independent of input voltage ramp rate. When unused, RSI must be tied to ground through a 100kΩ resistor; leaving it floating may cause erratic POR behavior.
What thermal performance can be expected from EL7534IY-T7 in MSOP10 package?
EL7534IY-T7 in the MSOP10 package achieves θJA = 115°C/W on a high-conductivity 4-layer PCB and 206°C/W on a 2-layer board. With 600mA load and 3.3V input → 1.8V output, power dissipation is ~150mW; this yields ~17°C rise above ambient on optimal layout. Thermal shutdown activates at 145°C junction, with automatic recovery at 130°C, ensuring robust operation under sustained load.
Can EL7534IY-T7 operate with ceramic output capacitors only?
Yes, EL7534IY-T7 is explicitly designed for ceramic output capacitors-10µF to 22µF X5R/X7R types are recommended. Its internal compensation and voltage-mode control ensure stability with low-ESR ceramics, eliminating the need for tantalum or aluminum electrolytic capacitors. This reduces solution size, improves reliability, and avoids aging-related capacitance drift inherent in wet electrolytics.
EL7534IY-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:
- 600mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
EL7534IY-T7 FAQ
1.How can I place an order for EL7534IY-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7534IY-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 EL7534IY-T7 reliable?
The price and inventory of EL7534IY-T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7534IY-T7 is usually 5 days.
3.What payment methods are accepted for EL7534IY-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7534IY-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7534IY-T7?
EL7534IY-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7534IY-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 EL7534IY-T7?
For technical support, including EL7534IY-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7534IY-T7 requirements.
6.How does Aetrix verify that EL7534IY-T7 is sourced from the original manufacturer or authorized distributors?
All EL7534IY-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 EL7534IY-T7 meets industry standards.
7.What is the process for return or replacement of EL7534IY-T7?
All EL7534IY-T7 units undergo pre-shipment inspection (PSI). If there is an issue with EL7534IY-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 EL7534IY-T7 part is unused and in its original packaging.
Return procedure for EL7534IY-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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