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Renesas ISL9305IRTBCNLZ-T
- Part No.:
- ISL9305IRTBCNLZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
ISL9305IRTBCNLZ-T.pdf
- Description:
- IC REG QUAD BUCK/LNR 3MHZ 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,097
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Product details
Overview
ISL9305IRTBCNLZ-T from Renesas Electronics is a dual-output PMIC integrating two 3MHz synchronous step-down converters (800mA each) and two low-input LDOs (300mA each), with I²C programmability for dynamic voltage scaling in battery-powered microprocessor systems. It operates from 2.3V–5.5V input, delivers factory-fixed DCD1/DCD2 outputs of 1.5V/1.8V and LDO1/LDO2 outputs of 3.3V/2.9V, and uses a 4mm×4mm TQFN-16 package for space-constrained portable electronics.
For engineers reviewing the ISL9305IRTBCNLZ-T datasheet, ISL9305IRTBCNLZ-T pinout, ISL9305IRTBCNLZ-T application, or ISL9305IRTBCNLZ-T equivalent, key selection considerations include I²C-controlled slew rate (0.225–28.8 mV/µs), skip-mode efficiency optimization, PGOOD delay programmability (1–200 ms), and thermal shutdown at 155°C with 30°C hysteresis.
Technical Context
The ISL9305IRTBCNLZ-T implements peak-current-mode PWM control for both buck converters, enabling fast transient response and pulse-by-pulse current limiting. Its 3MHz switching frequency supports compact 1.5µH inductors and low-ESR ceramic capacitors, while skip mode reduces quiescent current to 50µA (typ) under light load.
I²C interface (400kb/s) enables real-time configuration of output voltages (DCD: 0.825–3.6V @ 25mV/step; LDO: 0.9–3.6V @ 50mV/step), forced PWM/skip mode selection, active discharge control, and programmable PGOOD delay-without requiring external components beyond pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (DCD) | 2.3V to 5.5V - supports single Li-ion/Li-Polymer battery input without pre-regulation |
| Switching Frequency | 2.6–3.4 MHz (typ 3 MHz) - enables use of 1.5µH inductors and minimizes board area |
| DCD Output Current | 800 mA per channel - sufficient for DSP core or memory rail power in smartphones |
| LDO Output Current | 300 mA per channel - powers low-noise analog or RF subsystems from buck outputs or battery |
| I²C Interface Speed | 400 kb/s - compatible with standard Fast-mode I²C controllers for host system integration |
| Quiescent Current (Skip Mode) | 50 µA (typ) with both DCDs enabled - extends battery runtime in standby states |
| Thermal Shutdown Threshold | 155°C with 30°C hysteresis - protects against sustained overload or poor PCB thermal design |
Pinout & Package
ISL9305IRTBCNLZ-T is housed in a thermally enhanced 4mm × 4mm, 16-lead TQFN package with exposed E-pad for efficient heat dissipation. The pinout supports independent power domains for buck converters and LDOs, with dedicated grounds (GNDDCD1, GNDDCD2, GNDLDO) to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINDCD1 | Main input supply for DCD1 and internal circuitry | Primary power source for first buck converter and digital/analog core; must be ≥2.3V |
| FB1 | Feedback node for DCD1 output regulation | Connected directly to 1.5V output in fixed version; sets regulation point via internal reference (0.8V) |
| SCLK | I²C clock input | Requires external pull-up; supports 400 kb/s timing; tolerant to host controller voltage mismatch |
| SDAT | I²C bidirectional data line | Open-drain; requires external pull-up; shares bus with other I²C peripherals |
| VINLDO1 / VINLDO2 | Input supplies for LDO1 and LDO2 | Accept 1.5–5.5V; may be sourced from DCD outputs or battery directly |
| VOLDO1 / VOLDO2 | Regulated LDO outputs | Factory-set to 3.3V and 2.9V respectively; stable under 300mA load with <250mV dropout |
| DCDPG | Open-drain power-good indicator | Asserts high after programmable 1–200ms delay when both DCD outputs are within ±3% of nominal |
| SW1 / SW2 | Switching nodes for DCD1/DCD2 | Connect to inductor terminals; high dv/dt nodes requiring short, wide traces and ground shielding |
| GNDDCD1 / GNDDCD2 / GNDLDO | Separate power grounds | Isolate switching return paths from LDO analog ground to prevent noise injection |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3MHz synchronous buck converters | Enables ultra-compact DC/DC stage using 1.5µH inductors and 4.7µF ceramic output caps |
| I²C-programmable output voltage slew rate | Eight-step control (0.225–28.8 mV/µs) prevents overshoot during dynamic DVFS transitions |
| Programmable PGOOD delay (1–200 ms) | Allows precise sequencing with downstream logic or memory ICs requiring staggered enable timing |
| Active output discharge (115Ω bleed resistor) | Forces rapid DCD output collapse on disable, preventing floating rails and ensuring clean reset behavior |
| Ultrasonic skip mode option | Disables audible switching noise in PFM mode-critical for microphone/audio-sensitive smartphone designs |
Applications
| Smartphone Application | DSP Core Power |
|---|---|
Use Scenario: Dual-rail power delivery for application processor (1.5V core) and GPU (1.8V core) in LTE smartphones with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary PMIC managing dynamic voltage/frequency scaling (DVFS) via I²C under OS control; provides sequenced PGOOD for SoC boot. Use Value: Factory-fixed 1.5V/1.8V outputs eliminate external feedback resistors; 3MHz operation shrinks BOM size by >40% vs. 1MHz alternatives. | Use Scenario: Powering TI C6000 or Analog Devices SHARC DSP cores requiring tightly regulated 1.5V/1.8V with fast transient response. IC Role / Device Role / Timing Role: Dedicated buck-LDO combo supplying core and I/O rails; I²C slew control synchronizes voltage ramp with clock domain transitions. Use Value: 800mA per buck channel meets peak DSP load; <70ns minimum on-time ensures regulation down to 1.5V at 3.3V input. |
| Portable Media Player | Li-ion Battery-Powered Instrumentation |
Use Scenario: Power management for ARM-based media players with LCD backlight (buck), audio codec (LDO), and SD card interface (LDO). IC Role / Device Role / Timing Role: Single-chip solution delivering three independent rails: 1.5V (core), 1.8V (memory), 3.3V/2.9V (peripherals); PGOOD enables safe peripheral initialization. Use Value: Low 50µA skip-mode IQ extends playback time; 4mm×4mm footprint fits narrow bezel form factors. | Use Scenario: Precision handheld test equipment (e.g., multimeter, spectrum analyzer) powered by removable Li-ion pack. IC Role / Device Role / Timing Role: Central power manager converting battery voltage to stable rails for ADC reference, op-amp bias, and MCU core. Use Value: LDO PSRR >55dB at 1kHz suppresses switching noise from bucks; thermal shutdown prevents field failure during extended measurements. |
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 |
|---|---|---|---|
| TPS65023RSBR | 2.25MHz switching, 600mA DCDs, no I²C slew control, fixed 1.2V/1.8V DCD outputs | Lacks programmable PGOOD delay and active discharge; lower max output current | Choose for cost-sensitive designs where 600mA DCD current suffices and I²C flexibility is not required |
| RT8070ZSP | Single 3MHz buck (1.5A) + dual 300mA LDOs; I²C only for enable/control-not for voltage programming | No on-the-fly output voltage adjustment; fixed DCD output set at 1.5V/1.8V via pins | Select when only basic enable sequencing is needed and voltage scaling is handled externally |
Compared with TPS65023RSBR and RT8070ZSP, the ISL9305IRTBCNLZ-T uniquely combines factory-fixed yet I²C-reprogrammable outputs, 800mA per buck, 3MHz operation, and full slew/Pgood/discharge configurability-making it optimal for next-gen portable devices demanding dynamic power management.
Availability
ISL9305IRTBCNLZ-T is available at Aetrix Electronics and suitable for smartphone power management, DSP core supply, portable instrumentation, and Li-ion battery-powered embedded systems requiring stable component supply across long production cycles.
Supply support for ISL9305IRTBCNLZ-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 specializing in microcontrollers, analog power management, and automotive SoCs, with deep expertise in high-efficiency, small-footprint PMICs for mobile and embedded markets.
The ISL9305 product line was designed specifically for space- and battery-life-constrained portable electronics, integrating multiple power rails with intelligent I²C control to reduce system-level complexity and component count.
FAQ
What are the factory-set output voltages for ISL9305IRTBCNLZ-T?
The ISL9305IRTBCNLZ-T has factory-pre-set outputs: DCD1 = 1.5V, DCD2 = 1.8V, LDO1 = 3.3V, and LDO2 = 2.9V. These values are confirmed in the Ordering Information table (Page 4 of FN7605 Rev 2.00) and cannot be altered by external resistors since this is a fixed-output variant. All four rails remain fully I²C-programmable within their respective ranges (DCD: 0.825–3.6V; LDO: 0.9–3.6V).
Does ISL9305IRTBCNLZ-T support forced PWM mode for noise-sensitive applications?
Yes, ISL9305IRTBCNLZ-T supports forced PWM mode via I²C register control (DCD_PARAMETER bits B0/B1). When enabled, both DCD1 and DCD2 operate at constant 3MHz frequency regardless of load, eliminating variable-frequency switching noise that could interfere with audio, RF, or precision analog circuits-critical in smartphone and portable instrument designs.
How is power-good sequencing implemented on ISL9305IRTBCNLZ-T?
ISL9305IRTBCNLZ-T uses the open-drain DCDPG pin to indicate combined power-good status of both DCD outputs. Its assertion delay is programmable from 1ms to 200ms via SYS_PARAMETER register bits B5–B4. This allows precise synchronization with downstream logic, memory, or FPGA configuration sequences-ensuring stable rails before system enable.
What thermal management features does ISL9305IRTBCNLZ-T include?
ISL9305IRTBCNLZ-T integrates thermal shutdown at 155°C (typ) with 30°C hysteresis, plus an exposed E-pad in its 4mm×4mm TQFN package. The datasheet specifies θJA = 40.2°C/W and θJC = 5°C/W, requiring ≥9 thermal vias under the E-pad per Figure 4. These features prevent damage during sustained overload or inadequate PCB copper pour.
Can ISL9305IRTBCNLZ-T actively discharge its DCD outputs when disabled?
Yes, ISL9305IRTBCNLZ-T includes an internal 115Ω bleeding resistor (typ) for each DCD output, enabled by default via DCD_PARAMETER register bits B3/B2. When a DCD is disabled, this resistor rapidly discharges its output capacitor-preventing floating voltages, ensuring deterministic reset behavior, and meeting strict power-rail collapse requirements in portable systems.
ISL9305IRTBCNLZ-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:
- 1.5V, 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)
ISL9305IRTBCNLZ-T FAQ
1.How can I place an order for ISL9305IRTBCNLZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9305IRTBCNLZ-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 ISL9305IRTBCNLZ-T reliable?
The price and inventory of ISL9305IRTBCNLZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9305IRTBCNLZ-T is usually 5 days.
3.What payment methods are accepted for ISL9305IRTBCNLZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9305IRTBCNLZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9305IRTBCNLZ-T?
ISL9305IRTBCNLZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9305IRTBCNLZ-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 ISL9305IRTBCNLZ-T?
For technical support, including ISL9305IRTBCNLZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9305IRTBCNLZ-T requirements.
6.How does Aetrix verify that ISL9305IRTBCNLZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9305IRTBCNLZ-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 ISL9305IRTBCNLZ-T meets industry standards.
7.What is the process for return or replacement of ISL9305IRTBCNLZ-T?
All ISL9305IRTBCNLZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9305IRTBCNLZ-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 ISL9305IRTBCNLZ-T part is unused and in its original packaging.
Return procedure for ISL9305IRTBCNLZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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