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Renesas ISL9305IRTWCNYZ-T
- Part No.:
- ISL9305IRTWCNYZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
ISL9305IRTWCNYZ-T.pdf
- Description:
- IC REG QUAD BUCK/LNR 3MHZ 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:11,174
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Product details
Overview
ISL9305IRTWCNYZ-T from Renesas Electronics is a dual-output PMIC integrating two 3MHz synchronous step-down converters (800mA each) and two I²C-programmable LDOs (300mA each), with factory-set DCD1=1.2V, DCD2=1.8V, LDO1=3.3V, and LDO2=0.9V. It operates from a single Li-ion battery (2.3–5.5V input) and delivers tightly regulated low-voltage rails for microprocessor core and I/O power in space-constrained portable devices.
For engineers reviewing the ISL9305IRTWCNYZ-T datasheet, ISL9305IRTWCNYZ-T pinout, ISL9305IRTWCNYZ-T application, or ISL9305IRTWCNYZ-T equivalent, key selection considerations include I²C-configurable slew rate (0.225–28.8 mV/µs), programmable PFM/PWM mode per buck channel, active output discharge, and 4mm×4mm TQFN-16 thermal performance for battery-powered DSP and smartphone SoC power domains.
Technical Context
The ISL9305IRTWCNYZ-T implements peak-current-mode PWM control for both buck converters, enabling fast transient response and cycle-by-cycle current limiting. Its 3MHz switching frequency supports ultra-small 1.5µH inductors and compact ceramic capacitors while maintaining high efficiency across load ranges via skip-mode operation under light loads.
I²C interface (400kb/s) provides full digital control of all four outputs: DCD1/DCD2 voltage (0.825–3.6V at 25mV/step), LDO1/LDO2 voltage (0.9–3.6V at 50mV/step), slew rate, PFM/PWM mode, phase alignment, and power-good delay (1–200ms). The device includes integrated bleeding resistors (115Ω typ.) for active discharge and thermal shutdown at 155°C with 30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (DCD) | 2.3V to 5.5V - supports direct connection to single-cell Li-ion/Li-Polymer batteries without pre-regulation. |
| DCD Output Current | 800mA per channel - sufficient for ARM Cortex-A/M cores and memory I/O rails in smartphones and PDAs. |
| LDO Output Current | 300mA per channel - enables clean, low-noise supply for RF transceivers or analog sensors requiring <45µVRMS noise. |
| Switching Frequency | 3.0MHz ±0.4MHz - allows use of 1.5µH inductors and reduces EMI fundamental frequency beyond typical AM band. |
| I²C Interface Speed | 400kb/s - compatible with standard Fast-mode I²C controllers for real-time dynamic voltage scaling during processor DVFS transitions. |
| Quiescent Current (Skip Mode) | 50µA typ. with both DCDs enabled - extends battery runtime in standby and low-power listening modes. |
| Thermal Shutdown Threshold | 155°C - protects against sustained overload or poor PCB thermal design in sealed handheld enclosures. |
Pinout & Package
ISL9305IRTWCNYZ-T is housed in a thermally enhanced 4mm × 4mm, 16-lead TQFN package with exposed E-pad for efficient heat dissipation. The package is RoHS-compliant, Pb-free, and rated MSL-3 per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINDCD1 | Main input supply for DCD1 and internal circuitry | Primary power rail; must be decoupled with ≥10µF ceramic capacitor close to pin to stabilize high-frequency switching noise. |
| FB1 | Feedback node for DCD1 output regulation | Connected directly to VODCD1 for fixed-output version (ISL9305IRTWCNYZ-T); no external resistor divider required. |
| SCLK | I²C clock input | Requires external pull-up to host logic voltage; timing compliant with Fast-mode I²C (400kb/s max). |
| SDAT | I²C bidirectional data line | Open-drain; requires external pull-up; supports read/write register access and status monitoring. |
| VINLDO1 / VINLDO2 | Independent input supplies for LDO1/LDO2 | Can be powered from battery or from DCD outputs; supports flexible rail sequencing and fault isolation. |
| VOLDO1 / VOLDO2 | Regulated LDO output terminals | Factory-set to 3.3V and 0.9V respectively; programmable via I²C register 0x02/0x03 in 50mV steps. |
| DCDPG | Open-drain power-good indicator | Signals combined status of DCD1/DCD2; programmable delay (1–200ms) prevents false triggering during startup transients. |
| SW1 / SW2 | Switching nodes for DCD1/DCD2 | Connect to inductor high-side terminals; require short, wide traces and ground stitching to minimize EMI radiation. |
| GNDDCD1 / GNDDCD2 / GNDLDO | Separate power grounds | Must be connected to common system ground plane under E-pad; separation reduces noise coupling between switching and linear regulators. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3MHz synchronous buck converters | Enables use of 1.5µH inductors and sub-5mm footprint designs while maintaining >90% efficiency at 500mA load. |
| I²C-programmable output voltage slew rate | Configurable from 0.225 to 28.8 mV/µs per buck channel - supports controlled ramp-up/down during DVFS to prevent undershoot/overshoot on sensitive cores. |
| Per-channel PFM/PWM mode selection | Maximizes light-load efficiency (50µA quiescent) while guaranteeing fixed-frequency operation for noise-sensitive analog circuits. |
| Active output discharge via internal 115Ω resistor | Ensures rapid, controlled discharge of DCD outputs when disabled - eliminates hold-up voltage that could cause latch-up in downstream logic. |
| Programmable DCD power-good delay (1–200ms) | Prevents premature system wake-up by allowing output settling before asserting PG signal - critical for reliable boot sequencing. |
Applications
| Smartphone Application | DSP Core Power |
|---|---|
Use Scenario: Dual-rail power delivery for application processor (1.2V core, 1.8V I/O) and baseband subsystem (3.3V peripherals, 0.9V low-power domain) in LTE smartphones. IC Role / Device Role / Timing Role: Integrated mini-PMIC providing sequenced, I²C-controlled voltage rails with independent enable/disable and power-good signaling. Use Value: Reduces BOM count by replacing four discrete regulators; factory-set voltages eliminate external feedback components for production-ready design-in. | Use Scenario: Powering TI C6000 or Analog Devices SHARC DSPs requiring tightly regulated 1.2V core and 1.8V I/O rails with fast transient response. IC Role / Device Role / Timing Role: Primary power source delivering low-noise, dynamically scalable voltage rails synchronized to DSP clock domain via I²C. Use Value: 3MHz switching minimizes output capacitor size while maintaining <1% output ripple at 100kHz bandwidth - essential for high-SNR audio processing. |
| Portable Medical Instrument | Wearable Sensor Hub |
Use Scenario: Power management for FDA-cleared handheld ultrasound or glucose monitor with battery life >12 hours and strict EMI limits. IC Role / Device Role / Timing Role: Single-chip solution generating isolated, low-noise rails for analog front-end (3.3V), MCU core (1.2V), and sensor bias (0.9V). Use Value: LDO2's 0.9V fixed output and 45µVRMS noise meet medical-grade analog signal integrity requirements without additional filtering. | Use Scenario: Compact wearable platform integrating BLE SoC, IMU, and optical heart-rate sensor powered by coin-cell or thin Li-Po battery. IC Role / Device Role / Timing Role: Ultra-low-quiescent PMIC enabling multi-day operation in sleep mode while supporting rapid wake-up with controlled voltage ramp. Use Value: 50µA skip-mode IQ and programmable slew rate extend battery life and prevent brown-out during sensor burst sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck + dual-LDO PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65136YFFR | Single 3MHz buck (1A) + dual LDOs (300mA); lacks second buck converter and I²C programmability. | Not suitable for independent dual-core rail generation; limited to single-core + I/O + peripheral configurations. | Select only if system requires only one high-current rail and simpler control interface (no I²C). |
| RTQ2134B-QA | 2.5MHz dual buck (800mA) + dual LDOs (300mA); I²C interface but fixed 1.2V/1.8V DCD outputs and no slew rate control. | Supports same smartphone rail set but cannot reconfigure output voltages or slew rates post-manufacture. | Choose when firmware flexibility is unnecessary and cost sensitivity outweighs programmability needs. |
Compared with TPS65136YFFR and RTQ2134B-QA, ISL9305IRTWCNYZ-T uniquely combines dual 3MHz bucks, full I²C configurability (including slew rate and PFM/PWM per channel), and factory-set 0.9V LDO2 - making it optimal for next-generation portable SoCs requiring dynamic, low-noise, and space-efficient power delivery.
Availability
ISL9305IRTWCNYZ-T is available at Aetrix Electronics and suitable for smartphone power management, DSP core supply, portable medical instrumentation, and wearable sensor hub designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9305IRTWCNYZ-T 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 is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT markets, with deep expertise in power management and mixed-signal ICs.
The ISL9305IRTWCNYZ-T belongs to Renesas' mini-PMIC product line, engineered specifically for battery-powered portable electronics requiring high integration, ultra-small footprint, and intelligent digital power control.
FAQ
What are the factory-set output voltages for ISL9305IRTWCNYZ-T?
The ISL9305IRTWCNYZ-T has factory-pre-set output voltages: DCD1 = 1.2V, DCD2 = 1.8V, LDO1 = 3.3V, and LDO2 = 0.9V. These values are confirmed in the Ordering Information table (Page 4 of FN7605 Rev 2.00) and do not require external feedback resistors. All outputs remain fully I²C-programmable within their respective ranges (e.g., DCD1 adjustable from 0.825V to 3.6V in 25mV steps).
Does ISL9305IRTWCNYZ-T support independent enable/disable control of each regulator?
Yes, ISL9305IRTWCNYZ-T supports independent enable/disable control of all four regulators via the SYS_PARAMETER register (address 0x05h). Bits B0–B3 allow individual activation of DCD1, DCD2, LDO1, and LDO2. This enables precise power sequencing, dynamic rail shutdown during low-power states, and fault isolation - critical for complex portable SoC power trees.
What is the maximum I²C clock frequency supported by ISL9305IRTWCNYZ-T?
The ISL9305IRTWCNYZ-T supports I²C Fast-mode operation up to 400kb/s, as specified in the Features section (Page 1) and I²C Compatible Interface section (Page 9). The device complies with standard Philips I²C timing requirements, including setup/hold times and rise/fall specifications, ensuring interoperability with common microcontroller I²C peripherals without additional level-shifting.
How does the active output discharge function work on ISL9305IRTWCNYZ-T?
The ISL9305IRTWCNYZ-T integrates an internal 115Ω bleeding resistor per buck channel (DCD1/DCD2), enabled by default via DCD_PARAMETER register bits B2/B3. When a buck converter is disabled, this resistor actively discharges its output capacitor to ground, preventing residual voltage that could cause unintended logic states or latch-up in downstream circuitry - a key requirement for reliable power sequencing in portable systems.
What thermal management features are included in ISL9305IRTWCNYZ-T?
ISL9305IRTWCNYZ-T includes thermal shutdown at 155°C (with 30°C hysteresis) and a thermally enhanced 4mm×4mm TQFN package with exposed E-pad. The datasheet specifies θJA = 40.2°C/W and θJC = 5°C/W (Page 5), and recommends 9 vias under the E-pad connected to a solid ground plane (Page 8) to maintain junction temperature below 125°C under full 800mA load per buck channel.
ISL9305IRTWCNYZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) (2), Linear (LDO) (2)
- Number of Outputs:
- 4
- Frequency - Switching:
- 3MHz
- Voltage/Current - Output 1:
- 1.2V, 800mA
- Voltage/Current - Output 2:
- 1.8V, 800mA
- Voltage/Current - Output 3:
- 3.3V, 350mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 1.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (4x4)
ISL9305IRTWCNYZ-T FAQ
1.How can I place an order for ISL9305IRTWCNYZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9305IRTWCNYZ-T 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 ISL9305IRTWCNYZ-T reliable?
The price and inventory of ISL9305IRTWCNYZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9305IRTWCNYZ-T is usually 5 days.
3.What payment methods are accepted for ISL9305IRTWCNYZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9305IRTWCNYZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9305IRTWCNYZ-T?
ISL9305IRTWCNYZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9305IRTWCNYZ-T 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 ISL9305IRTWCNYZ-T?
For technical support, including ISL9305IRTWCNYZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9305IRTWCNYZ-T requirements.
6.How does Aetrix verify that ISL9305IRTWCNYZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9305IRTWCNYZ-T 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 ISL9305IRTWCNYZ-T meets industry standards.
7.What is the process for return or replacement of ISL9305IRTWCNYZ-T?
All ISL9305IRTWCNYZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9305IRTWCNYZ-T, 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 ISL9305IRTWCNYZ-T part is unused and in its original packaging.
Return procedure for ISL9305IRTWCNYZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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