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Renesas ISL6455AIRZS2698
- Part No.:
- ISL6455AIRZS2698
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ISL6455AIRZS2698.pdf
- Description:
- IC REG CONV FPGA 3OUT 24QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL6455AIRZS2698 from Renesas (formerly Intersil) is a triple-output power management IC integrating one synchronous buck regulator and two adjustable ultra-low-noise LDOs for FPGA and wireless chipset applications. It delivers 600mA PWM output (0.8V–3.3V), dual 300mA LDOs with <30µVRMS noise on LDO2, and integrated RESET/PGOOD monitoring. Designed for PCMCIA, Mini-PCI, and CardBus-32 WLAN cards.
For engineers reviewing the ISL6455AIRZS2698 datasheet, ISL6455AIRZS2698 pinout, ISL6455AIRZS2698 application, or ISL6455AIRZS2698 equivalent, key selection criteria include input voltage compatibility (5.0V ±10%), LDO2 noise performance for VCO supply, thermal shutdown at 150°C, and QFN-24 package integration with internal PMOS pass devices.
Technical Context
The ISL6455AIRZS2698 implements peak current-mode control in its 750kHz synchronous buck stage, using integrated P-Channel and N-Channel MOSFETs with internal slope compensation and 1300mA peak current limit. Its feedback reference is 0.45V for PWM and 1.184V for both LDOs, enabling precise external resistor-based output adjustment.
Each LDO employs an internal PMOS pass transistor (typical rDS(ON) = 0.5Ω), delivering 150mV dropout at 300mA and supporting ceramic output capacitors ≥3.3µF. The RESET function uses an external CT capacitor to set a minimum 25ms active-low timeout, while PG_LDO and PG_PWM provide independent open-drain fault indicators for LDO and PWM regulation status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PWM Output Current | 600mA max - supports core rail for mid-complexity FPGAs and baseband processors |
| PWM Output Voltage Range | 0.8V to 3.3V - set via external resistors Re/Rf; compatible with 5.0V input (ISL6455A variant) |
| LDO1/LDO2 Output Current | 300mA each - sufficient for I/O banks and analog subsystems in compact wireless cards |
| LDO2 Output Noise | <30µVRMS (10Hz–100kHz) - ensures VCO phase stability in WLAN RF sections |
| Operating Frequency | 620–880kHz typical - enables use of small 8.2µH inductors and low-ESR ceramic capacitors |
| Thermal Shutdown Threshold | 150°C rising, 20°C hysteresis - protects against sustained overload in sealed enclosures |
| RESET Timeout | 25ms minimum (CT = 0.01µF) - meets microprocessor reset timing requirements per JEDEC JESD22-A102 |
| Package | 24-lead QFN (4mm × 4mm, 0.5mm pitch) - JEDEC MO-220 compliant with exposed thermal pad for PCB heat sinking |
Pinout & Package
ISL6455AIRZS2698 is housed in a 24-lead, 4mm × 4mm, 0.5mm-pitch Quad Flat No-Lead (QFN) package with an exposed thermal pad. The package complies with JEDEC PUB95 MO-220 and supports Pb-free (RoHS-compliant) reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | PWM enable control | CMOS-level input referenced to VIN; pulls PWM into shutdown when low |
| EN_LDO | LDO1/LDO2 enable control | CMOS-level input referenced to VIN; disables both LDOs when low |
| FB_PWM | PWM output voltage feedback | Connects to resistor divider (Re/Rf) to set 0.45V reference point for 0.8–3.3V output |
| FB_LDO1 / FB_LDO2 | LDO1/LDO2 output voltage feedback | Each connects to dedicated resistor pair (Rc/Rd, Ra/Rb) referencing 1.184V internal bandgap |
| PG_PWM / PG_LDO | Power-good status outputs | Open-drain NMOS outputs indicating regulation loss on PWM or either LDO (±15% threshold) |
| RESET | Supervisory reset output | Push-pull active-low signal asserting for ≥25ms after VIN crosses reset threshold (4.16–4.35V for ISL6455A) |
| CT | Reset timeout timing | Connects to 0.01µF capacitor to set 25ms minimum reset pulse width |
| VIN / PVCC / VIN_LDO | Input supply rails | VIN powers PWM controller; PVCC supplies internal FET stage; VIN_LDO feeds both LDOs (3.0–5.5V range) |
| LX | Switching node | Internal connection point between P-Channel source and N-Channel drain; connects directly to inductor |
| GND / PGND / SGND / GND_LDO | Ground terminals | Dedicated analog (SGND), power (PGND), LDO (GND_LDO), and system (GND) grounds - must be routed separately and joined at single point |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous buck + dual LDO | Reduces BOM count by eliminating discrete regulators and external MOSFETs; enables single-chip 3-rail solution |
| Ultra-low-noise LDO2 | <30µVRMS noise supports stable VCO operation in 2.4GHz/5GHz WLAN transceivers without added filtering |
| Internal PMOS pass transistors | Eliminates base-drive current; achieves 150mV dropout at 300mA while minimizing quiescent power in LDO mode |
| Programmable RESET timeout | External CT capacitor sets precise reset hold time (25ms minimum), removing need for discrete supervisor IC |
| Comprehensive protection suite | Includes PWM overvoltage (31% threshold), overcurrent (1300mA peak), thermal shutdown (150°C), and UVLO (4.05V rising for ISL6455A) |
| QFN-24 near chip-scale footprint | 4mm × 4mm body with exposed thermal pad improves PCB space efficiency and thermal performance in thin-form-factor cards |
Applications
| WLAN Mini-PCI Card Power | Compact Flash Host Controller |
|---|---|
Use Scenario: Powering dual-band 802.11a/b/g/n radio modules in embedded mini-PCI form factor. IC Role / Device Role / Timing Role: ISL6455AIRZS2698 provides three regulated rails: 1.8V for baseband processor (PWM), 3.3V for digital I/O (LDO1), and ultra-clean 2.8V for VCO (LDO2). Use Value: LDO2's <30µVRMS noise prevents phase jitter degradation in RF synthesizers, maintaining EVM compliance under dynamic load. |
Use Scenario: Supplying host controller and NAND flash interface in industrial compact flash adapters. IC Role / Device Role / Timing Role: ISL6455AIRZS2698 delivers 3.3V (LDO1) for I/O buffers, 1.8V (PWM) for controller core, and 1.2V (LDO2) for memory VDDQ with tight regulation. Use Value: Integrated PG_LDO and PG_PWM signals enable coordinated power sequencing and fault reporting without external logic. |
| PCMCIA Wireless Adapter | CardBus-32 Baseband Module |
Use Scenario: Power management for legacy PCMCIA WLAN cards requiring strict 3.3V input compliance and low-profile packaging. IC Role / Device Role / Timing Role: ISL6455AIRZS2698 accepts 5.0V input (ISL6455A variant), generates 1.2V core (PWM), 3.3V I/O (LDO1), and 2.5V analog (LDO2) with independent enable controls. Use Value: EN and EN_LDO pins allow staggered power-up sequences meeting PCMCIA 3.0 specification timing windows. |
Use Scenario: Dual-rail power for CardBus-32 baseband processors with separate analog/digital domains. IC Role / Device Role / Timing Role: ISL6455AIRZS2698 supplies 1.5V core (PWM), 3.3V interface (LDO1), and 2.8V RF bias (LDO2), all monitored by shared RESET and PG outputs. Use Value: Single-chip integration reduces layout area by >40% versus discrete solutions while maintaining thermal margin via exposed QFN pad. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65283-1RGER | Triple-output buck-buck-LDO; 3A/2A/0.3A ratings; no integrated RESET; 16-pin QFN | Higher current capability but larger footprint; lacks LDO2 noise optimization for VCO | Preferred for high-current baseband SoCs where LDO2 noise is not critical |
| MAX8646ETE+ | Dual synchronous buck + single LDO; 1.5A/1.5A/300mA; integrated I2C interface; 24-pin TQFN | Supports dynamic voltage scaling via I2C but no dedicated VCO-grade LDO; requires external RESET IC | Selected when programmable output sequencing and telemetry are required over fixed-function simplicity |
Compared with TPS65283-1RGER and MAX8646ETE+, the ISL6455AIRZS2698 offers superior LDO2 noise performance and integrated RESET in a smaller QFN-24 package, making it optimal for space-constrained, noise-sensitive WLAN card designs where fixed output voltages suffice.
Availability
ISL6455AIRZS2698 is available at Aetrix Electronics and suitable for WLAN mini-PCI cards, compact flash host controllers, and CardBus-32 baseband modules requiring stable component supply across extended product lifecycles.
Supply support for ISL6455AIRZS2698 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
Renesas Electronics acquired Intersil in 2017 and maintains full technical and supply chain support for legacy Intersil power management products.
The ISL6455AIRZS2698 belongs to Renesas' integrated power management IC portfolio targeting wireless infrastructure and portable communications, designed specifically to consolidate FPGA and chipset power rails into minimal-footprint, thermally efficient solutions.
FAQ
What input voltage range does the ISL6455AIRZS2698 support for its PWM section?
The ISL6455AIRZS2698 (A-version) supports a PWM input voltage range of 4.2V to 5.5V, with a typical operating point at 5.0V ±10%. Its undervoltage lockout (UVLO) activates below 3.94V (rising threshold) and releases above 4.19V, ensuring reliable startup and brownout protection for 5V-sourced systems. This distinguishes it from the ISL6455 (non-A) variant rated for 3.3V input.
How is the output voltage of the ISL6455AIRZS2698's LDO2 configured, and why is it critical for RF applications?
The ISL6455AIRZS2698's LDO2 output voltage is set using external resistors Ra and Rb connected to the FB_LDO2 pin, referencing an internal 1.184V bandgap. Its design delivers <30µVRMS output noise (10Hz–100kHz) at 300mA, which directly stabilizes VCO phase noise in 2.4GHz/5GHz WLAN transceivers-preventing EVM degradation and spectral regrowth that would occur with higher-noise regulators.
Does the ISL6455AIRZS2698 require external compensation components for its LDO regulators?
Yes, the ISL6455AIRZS2698 requires 33nF ceramic compensation capacitors connected from CC1 and CC2 to GND_LDO for each LDO. These capacitors minimize load and line regulation errors, reduce output noise, and ensure stability across temperature and load variations-particularly critical for LDO2's VCO-supply role where transient response affects RF lock time.
What protection features are implemented in the ISL6455AIRZS2698's synchronous buck regulator?
The ISL6455AIRZS2698's synchronous buck regulator includes overvoltage protection (31% above nominal, triggered after 32 consecutive cycles), overcurrent protection (1300mA peak limit with automatic soft-start recovery), thermal shutdown (150°C with 20°C hysteresis), and UVLO (4.05V rising threshold). All protections are fully integrated-no external components needed for fault response or recovery.
Can the ISL6455AIRZS2698's switching frequency be synchronized to an external clock, and what is the supported range?
Yes, the ISL6455AIRZS2698 supports external synchronization via the SYNC pin across a 500kHz to 1MHz range. The device detects rising edges automatically and switches seamlessly between internal (750kHz typical) and external clocks-even recovering without interruption if the external clock stops. Minimum/maximum duty cycle limits (20%/80%) ensure robust edge detection.
ISL6455AIRZS2698 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Converter, FPGA
- Voltage - Input:
- 4.2V ~ 5.5V
- Number of Outputs:
- 3
- Voltage - Output:
- 0.8V ~ 3.3V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
ISL6455AIRZS2698 FAQ
1.How can I place an order for ISL6455AIRZS2698 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6455AIRZS2698 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 ISL6455AIRZS2698 reliable?
The price and inventory of ISL6455AIRZS2698 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6455AIRZS2698 is usually 5 days.
3.What payment methods are accepted for ISL6455AIRZS2698?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6455AIRZS2698 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6455AIRZS2698?
ISL6455AIRZS2698 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6455AIRZS2698 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 ISL6455AIRZS2698?
For technical support, including ISL6455AIRZS2698 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6455AIRZS2698 requirements.
6.How does Aetrix verify that ISL6455AIRZS2698 is sourced from the original manufacturer or authorized distributors?
All ISL6455AIRZS2698 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 ISL6455AIRZS2698 meets industry standards.
7.What is the process for return or replacement of ISL6455AIRZS2698?
All ISL6455AIRZS2698 units undergo pre-shipment inspection (PSI). If there is an issue with ISL6455AIRZS2698, 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 ISL6455AIRZS2698 part is unused and in its original packaging.
Return procedure for ISL6455AIRZS2698:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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