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Renesas ISL6455AIRZ-T5K
- Part No.:
- ISL6455AIRZ-T5K
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ISL6455AIRZ-T5K.pdf
- Description:
- IC REG CONV FPGA 3OUT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
ISL6455AIRZ-T5K 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 power rails. It delivers 600mA PWM output (0.8V–3.3V), dual 300mA LDOs with <30µVRMS noise on LDO2, and integrated RESET/PGOOD monitoring - all in a 24-lead QFN package. Used in mini-PCI and CardBus-32 WLAN cards.
For engineers reviewing the ISL6455AIRZ-T5K datasheet, ISL6455AIRZ-T5K pinout, ISL6455AIRZ-T5K application, or ISL6455AIRZ-T5K equivalent, key selection criteria include input voltage compatibility (5.0V ±10%), LDO2 noise performance for VCO supply, PWM synchronization range (500kHz–1MHz), thermal shutdown threshold (150°C), and integrated reset timeout programmability via CT capacitor.
Technical Context
The ISL6455AIRZ-T5K implements peak current-mode control with internal slope compensation for its 750kHz (±130kHz) synchronous buck stage, using integrated P-Channel and N-Channel MOSFETs (rDS(ON) = 170mΩ / 50mΩ). Its dual LDOs employ internal PMOS pass devices with 150mV dropout at 300mA and separate 33nF compensation networks (CC1/CC2) to achieve <30µVRMS output noise on LDO2.
RESET functionality is implemented as a dedicated supervisory block with rising/falling thresholds of 4.19V/4.16V (ISL6455A), 25ms minimum assertion time set by CT capacitor, and independent UVLO (3.94V/3.78V) to ensure orderly power sequencing. PG_LDO and PG_PWM provide open-drain status outputs for both LDO and PWM regulation loss detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PWM Output Voltage Range | 0.8V to 3.3V - supports core logic and I/O rails of 5V-input FPGAs and baseband processors. |
| PWM Max Output Current | 600mA - sufficient for mid-power FPGA cores or RF transceiver digital sections. |
| LDO1/LDO2 Output Current | 300mA each - enables independent analog and reference rail generation for WLAN chipsets. |
| LDO2 Output Noise | <30µVRMS (10Hz–100kHz) - critical for stabilizing VCOs in 2.4GHz/5GHz RF front-ends. |
| Switching Frequency | 750kHz typical, 500kHz–1MHz sync range - allows compact 8.2µH inductor and ceramic capacitor design. |
| Dropout Voltage | 150mV typical at 300mA - minimizes power loss and heat in low-VIN LDO operation. |
| RESET Timeout | 25ms minimum (CT = 10nF) - meets JEDEC JESD88 requirements for microprocessor reset hold time. |
| Operating Temp Range | −40°C to +85°C - qualified for industrial-grade wireless card and handheld instrument environments. |
Pinout & Package
ISL6455AIRZ-T5K is housed in a 24-lead, 4mm × 4mm, 0.5mm pitch Quad Flat No-Lead (QFN) package compliant with JEDEC MO-220, featuring an exposed thermal pad for enhanced PCB heat dissipation. Pin functions are validated per FN9196 Rev 1.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | PWM enable control input | CMOS-level signal (referenced to VIN) that disables entire buck stage when pulled low; initiates 5.5ms soft-start on assertion. |
| EN_LDO | Dual LDO enable control input | CMOS-level signal enabling/disabling both LDO1 and LDO2 simultaneously; required for coordinated power sequencing. |
| FB_PWM | PWM output voltage feedback node | Connects external resistor divider (Re/Rf) to set regulated output; referenced to 0.45V internal bandgap. |
| FB_LDO1 / FB_LDO2 | LDO1/LDO2 output voltage feedback nodes | Each connects to resistor divider (Rc/Rd for LDO1; Ra/Rb for LDO2) referenced to 1.184V internal reference. |
| PG_PWM / PG_LDO | Power-good status outputs | Open-drain outputs indicating regulation loss: PG_PWM for buck output, PG_LDO for either LDO; require 10kΩ pull-up to VIN. |
| RESET | Supervisory reset output | Push-pull active-low output asserting for ≥25ms after VIN_PWM recovers above 4.19V; eliminates need for discrete reset IC. |
| CT | Reset timeout timing capacitor | Connects 10nF capacitor to GND to set 25ms minimum reset pulse width; linear scaling (2.5ms/nF). |
| VIN_LDO | LDO input supply pin | Accepts 3.0V–5.5V input; shared supply for both LDOs; must be decoupled with ≥1µF ceramic capacitor near pin. |
| VOUT1 / VOUT2 | LDO1/LDO2 regulated outputs | Deliver independently adjustable voltages (1.2V–3.3V); require ≥3.3µF ceramic output capacitors with ≤50mΩ ESR for stability. |
| LX | Synchronous buck switching node | Internal junction of P-Channel high-side and N-Channel low-side MOSFETs; connects directly to output inductor. |
| PVCC | PWM power stage supply | Provides gate drive and power switch bias; must be decoupled separately from VIN with low-ESR ceramic capacitor. |
| SGND / PGND / GND_LDO | Separate ground domains | SGND = analog ground for PWM control; PGND = power ground for buck stage; GND_LDO = analog ground for LDOs - must be tied together at single point under IC. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated triple-output architecture | Single-chip solution replaces discrete buck + dual LDO + reset IC - reduces BOM count and board area in space-constrained WLAN cards. |
| Ultra-low-noise LDO2 | <30µVRMS output noise enables direct powering of VCOs without additional filtering, improving phase noise and RF spectral purity. |
| Synchronous buck with internal MOSFETs | Eliminates external high-side/low-side switches and gate drivers; achieves >93% efficiency at 200mA/1.8V out from 3.3V input. |
| Programmable RESET timeout | External CT capacitor sets precise reset hold time (25ms minimum), ensuring reliable microprocessor initialization across temperature and voltage variations. |
| Comprehensive protection suite | Includes overcurrent, overvoltage, thermal shutdown (150°C), UVLO (3.94V/3.78V), and PGOOD monitoring - enables robust operation in unregulated DC environments. |
| QFN thermal-enhanced packaging | 24-lead 4×4mm QFN with exposed thermal pad lowers θJA to 42°C/W, supporting continuous 600mA PWM output in ambient up to +85°C. |
Applications
| WLAN Mini-PCI Card Power | Handheld Instrument Core Supply |
|---|---|
Use Scenario: Powers baseband processor, RF transceiver, and memory in compact mini-PCI WLAN cards operating from 5V bus. IC Role / Device Role / Timing Role: ISL6455AIRZ-T5K provides three independent, sequenced rails: 1.8V/600mA buck for processor core, 3.3V/300mA LDO1 for I/O, and 2.8V/300mA LDO2 for VCO. Use Value: Integrated RESET eliminates external supervisor IC; <30µVRMS LDO2 noise ensures clean VCO supply without added ferrite beads or LC filters. | Use Scenario: Supplies mixed-signal SoC in battery-powered handheld test equipment requiring stable analog references and low-noise digital rails. IC Role / Device Role / Timing Role: ISL6455AIRZ-T5K delivers 1.2V/600mA buck for digital core, 2.5V/300mA LDO1 for ADC reference, and 3.0V/300mA LDO2 for sensor interface - all from single 5V input. Use Value: Dual LDOs with separate feedback and compensation allow independent optimization of PSRR and transient response for analog vs. digital loads. |
| PCMCIA Wireless Adapter | CardBus-32 Baseband Module |
Use Scenario: Provides regulated power to legacy PCMCIA-form-factor 802.11b/g adapters with tight mechanical constraints and no heatsink provision. IC Role / Device Role / Timing Role: ISL6455AIRZ-T5K generates 1.5V/600mA (buck), 2.8V/300mA (LDO1), and 1.8V/300mA (LDO2) from 5V PCMCIA slot supply with coordinated EN/EN_LDO sequencing. Use Value: 24-lead QFN footprint (4×4mm) fits within narrow PCMCIA Type II card width; thermal pad enables conduction cooling through PCB ground plane. | Use Scenario: Powers dual-core baseband processor and companion RFIC in CardBus-32 embedded modules used in industrial M2M gateways. IC Role / Device Role / Timing Role: ISL6455AIRZ-T5K supplies 1.1V/600mA (buck), 3.3V/300mA (LDO1), and 2.5V/300mA (LDO2) with synchronized 750kHz switching to minimize EMI coupling into sensitive analog receive paths. Use Value: SYNC pin allows alignment of switching edges with system clock domain, reducing beat-frequency interference in wideband receivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65283-1RGER | Single buck + dual LDO; 3.0V–5.5V input; 1.0V–3.3V buck output; no integrated RESET; 16-pin QFN. | Lacks RESET function and PG_LDO monitoring; requires external supervisor for microprocessor reset. | Choose TPS65283-1RGER only if RESET is provided elsewhere and board space permits larger 16-pin footprint. |
| MAX8646ETE+T | Triple-output (buck + dual LDO); 2.7V–5.5V input; 0.6V–3.3V buck; integrated RESET; 24-pin TQFN but different pinout and thermal pad layout. | Higher quiescent current (15µA vs. 5µA shutdown); LDO2 noise not specified below 50µVRMS; no SYNC capability. | Select MAX8646ETE+T when lower shutdown current is non-critical and external clock synchronization is unnecessary. |
Compared with TPS65283-1RGER and MAX8646ETE+T, the ISL6455AIRZ-T5K uniquely combines integrated RESET with programmable timeout, sub-30µVRMS LDO2 noise, and 500kHz–1MHz synchronization - making it optimal for noise-sensitive, space-constrained WLAN and handheld RF designs where component count and EMI control are primary constraints.
Availability
ISL6455AIRZ-T5K is available at Aetrix Electronics and suitable for WLAN mini-PCI cards, handheld instrumentation, and CardBus-32 baseband modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6455AIRZ-T5K 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 Corporation (acquired Intersil in 2017) is a global semiconductor leader specializing in microcontrollers, analog power management, and connectivity solutions for industrial, automotive, and communications markets.
The ISL6455AIRZ-T5K belongs to Renesas' legacy Intersil power management portfolio, designed specifically for highly integrated, low-noise multi-rail power delivery in compact wireless infrastructure and portable electronics.
FAQ
What input voltage range does the ISL6455AIRZ-T5K support for its PWM section?
The ISL6455AIRZ-T5K PWM section supports an input voltage range of 4.2V to 5.5V, optimized for 5.0V ±10% nominal supply. This distinguishes it from the ISL6455IRZ variant (3.0V–3.6V), and is confirmed by VIN_PWM UVLO thresholds of 3.94V (rising) and 3.78V (falling) in the FN9196 datasheet. Operation outside this range risks UVLO activation or regulation failure.
How is the RESET timeout duration set for the ISL6455AIRZ-T5K?
The RESET timeout for ISL6455AIRZ-T5K is set by an external capacitor on the CT pin: a 10nF capacitor yields a minimum 25ms assertion time, scaling linearly at 2.5ms/nF. This is explicitly defined in the Electrical Specifications table (Note 5) and Functional Description section of FN9196. The CT pin must be connected to GND with a stable ceramic capacitor; no internal timer or resistor is used.
Can the ISL6455AIRZ-T5K synchronize its switching frequency to an external clock?
Yes, the ISL6455AIRZ-T5K supports external clock synchronization via the SYNC pin across a 500kHz to 1MHz range, as verified in the Oscillator Frequency specification and Synchronization functional description. The device automatically detects rising edges and switches seamlessly between internal (750kHz typical) and external clocks - with no interruption - and reverts to internal operation if SYNC signal stops.
What is the maximum output noise specification for LDO2 in the ISL6455AIRZ-T5K?
The ISL6455AIRZ-T5K LDO2 delivers <30µVRMS output noise (typical) over 10Hz–100kHz with 10µF output capacitance, per the LDO2 SPECIFICATIONS table on page 6 of FN9196. This value is measured at 10mA load and is critical for VCO supply stability. Performance degrades to 65µVRMS for LDO1 under identical conditions, confirming LDO2's specialized low-noise design.
Does the ISL6455AIRZ-T5K require external compensation components for its LDO regulators?
Yes, the ISL6455AIRZ-T5K requires external 33nF ceramic compensation capacitors: CC1 must connect between CC1 and GND_LDO for LDO1, and CC2 between CC2 and GND_LDO for LDO2. This is mandated in the Pin Descriptions (page 8) and Application Information (page 10) of FN9196 to ensure stability, minimize load/line regulation error, and achieve specified output noise performance.
ISL6455AIRZ-T5K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
ISL6455AIRZ-T5K FAQ
1.How can I place an order for ISL6455AIRZ-T5K through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6455AIRZ-T5K 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 ISL6455AIRZ-T5K reliable?
The price and inventory of ISL6455AIRZ-T5K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6455AIRZ-T5K is usually 5 days.
3.What payment methods are accepted for ISL6455AIRZ-T5K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6455AIRZ-T5K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6455AIRZ-T5K?
ISL6455AIRZ-T5K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6455AIRZ-T5K 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 ISL6455AIRZ-T5K?
For technical support, including ISL6455AIRZ-T5K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6455AIRZ-T5K requirements.
6.How does Aetrix verify that ISL6455AIRZ-T5K is sourced from the original manufacturer or authorized distributors?
All ISL6455AIRZ-T5K 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 ISL6455AIRZ-T5K meets industry standards.
7.What is the process for return or replacement of ISL6455AIRZ-T5K?
All ISL6455AIRZ-T5K units undergo pre-shipment inspection (PSI). If there is an issue with ISL6455AIRZ-T5K, 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 ISL6455AIRZ-T5K part is unused and in its original packaging.
Return procedure for ISL6455AIRZ-T5K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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