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Renesas ISL9305IRTWBNLZ-T
- Part No.:
- ISL9305IRTWBNLZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
ISL9305IRTWBNLZ-T.pdf
- Description:
- IC REG QUAD BUCK/LNR 3MHZ 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,223
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Product details
Overview
ISL9305IRTWBNLZ-T from Renesas Electronics is a dual-buck + dual-LDO mini-PMIC for Li-ion/Li-Polymer battery-powered systems. It integrates two 800mA, 3MHz synchronous step-down converters (DCD1=1.2V, DCD2=1.5V) and two 300mA LDOs (LDO1=3.3V, LDO2=2.9V), all factory pre-set and I²C-programmable. Its 4mm×4mm TQFN package supports compact smartphone and portable media player power architectures.
For engineers reviewing the ISL9305IRTWBNLZ-T datasheet, ISL9305IRTWBNLZ-T pinout, ISL9305IRTWBNLZ-T application, or ISL9305IRTWBNLZ-T equivalent, key selection criteria include fixed-output voltage configuration, 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 ISL9305IRTWBNLZ-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 permits ultra-small external inductors (e.g., 1.5µH) and ceramic capacitors, minimizing board area while maintaining stability across 2.3–5.5V input range.
Each buck converter supports programmable operation modes-auto skip (PFM) under light load or forced PWM for noise-sensitive applications-and active output discharge via internal 115Ω bleeding resistor. The I²C interface (400kb/s) enables on-the-fly voltage adjustment (25mV/step for bucks, 50mV/step for LDOs) and full register-level control of enable states, phase alignment, and power-good timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (DCD) | 2.3V to 5.5V - supports single-cell Li-ion (2.7–4.2V typical) with 200mV UVLO hysteresis for reliable startup and brownout protection. |
| DCD Output Current | 800mA per channel - sufficient to power ARM Cortex-A/M cores or DDR memory rails without external boost stages. |
| LDO Output Current | 300mA per channel - delivers low-noise bias for RF transceivers or analog sensors with <45µVRMS output noise. |
| Switching Frequency | 3.0MHz ±0.4MHz - enables use of 1.5µH inductors and 4.7µF output caps, reducing solution size by >40% vs. 1MHz designs. |
| I²C Interface Speed | 400kb/s - compatible with standard Fast-mode I²C controllers, allowing dynamic voltage scaling during CPU DVFS transitions. |
| Quiescent Current (Skip Mode) | 50µA typical with both DCDs enabled - extends battery runtime in standby by minimizing no-load losses. |
| Thermal Shutdown | 155°C with 30°C hysteresis - protects against sustained overload or poor PCB thermal design without requiring external thermal monitoring. |
Pinout & Package
ISL9305IRTWBNLZ-T is housed in a thermally enhanced 4mm × 4mm, 16-lead TQFN package with exposed E-pad for efficient heat dissipation. Pin assignment follows standard top-view layout with dedicated power grounds (GNDDCD1, GNDDCD2, GNDLDO) and isolated switching nodes (SW1, SW2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINDCD1 | Main input supply for DCD1 and internal circuitry | Accepts 2.3–5.5V; powers entire IC when used as primary rail - must be decoupled with ≥10µF ceramic capacitor near pin. |
| FB1 / FB2 | Feedback inputs for DCD1 / DCD2 | Fixed-output version: internally connected to respective outputs - no external resistors required; simplifies layout and eliminates resistor tolerance errors. |
| SCLK / SDAT | I²C clock and bidirectional data lines | 400kb/s Fast-mode compatible; require external pull-up resistors to VCC_I2C (≤VIN); support dynamic voltage reconfiguration during system operation. |
| VINLDO1 / VINLDO2 | Independent LDO input supplies | Accept 1.5–5.5V; may be powered from DCD outputs or battery directly - enables flexible rail sequencing and independent LDO enable control. |
| VOLDO1 / VOLDO2 | LDO regulated outputs | Factory-set to 3.3V and 2.9V respectively; programmable in 50mV steps via I²C - supports adaptive I/O voltage tuning for memory or interface compliance. |
| DCDPG | Open-drain power-good indicator | Signals combined status of DCD1/DCD2 outputs; delay programmable from 1ms to 200ms - enables precise system power sequencing and fault isolation. |
| SW1 / SW2 | Switching node outputs | Connect to inductor high-side terminals; high dv/dt nodes - must be routed short/wide with minimal loop area to reduce EMI and switching losses. |
| GNDDCD1 / GNDDCD2 / GNDLDO | Dedicated power grounds | Separate ground returns prevent coupling between switching and linear regulators - critical for achieving <45µVRMS LDO noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 800mA 3MHz buck converters | Enables compact, high-efficiency core/SRAM rail generation using 1.5µH inductors - reduces total BOM cost and footprint vs. discrete solutions. |
| Factory pre-set output voltages | DCD1=1.2V, DCD2=1.5V, LDO1=3.3V, LDO2=2.9V - eliminates external feedback resistors and calibration, accelerating time-to-market for volume production. |
| I²C-programmable slew rate | Configurable from 0.225 to 28.8 mV/µs - prevents overshoot/undershoot during dynamic voltage scaling, ensuring stable operation of sensitive digital loads. |
| Programmable PGOOD delay (1–200 ms) | Allows synchronization with system boot sequence or FPGA configuration timing - avoids false resets due to staggered rail ramp-up. |
| Active output discharge (115Ω bleed) | Forces rapid discharge of DCD outputs when disabled - prevents floating voltages that could cause latch-up or back-powering in multi-rail systems. |
Applications
| Smartphone Application | Portable Media Player |
|---|---|
Use Scenario: Powering application processor core (1.2V) and GPU (1.5V) from single Li-Po cell while supplying USB PHY (3.3V) and audio codec (2.9V). IC Role / Device Role / Timing Role: Dual-buck provides high-efficiency core rails; dual-LDO delivers low-noise, fast-transient I/O and analog bias with independent enable control. Use Value: Achieves >90% efficiency at 500mA load per buck, extending talk time by 12% vs. legacy 1MHz PMICs; I²C slew control prevents logic glitches during DVFS transitions. | Use Scenario: Supplying NAND flash controller (1.2V), display driver (1.5V), Wi-Fi module (3.3V), and audio DAC (2.9V) in battery-operated media device. IC Role / Device Role / Timing Role: Integrated mini-PMIC consolidates four regulated rails into one package; I²C allows runtime voltage adaptation based on playback mode (e.g., lower LDO voltage during audio-only). Use Value: Reduces PCB area by 35% vs. discrete DC/DC + LDO solution; skip-mode quiescent current of 50µA extends idle battery life to >14 days. |
| DSP Core Power System | Industrial Handheld Terminal |
Use Scenario: Delivering tightly regulated 1.2V core and 1.5V I/O rails to low-power DSP with real-time processing requirements. IC Role / Device Role / Timing Role: Buck converters operate in forced PWM mode to suppress switching noise; LDOs provide clean bias for ADC reference and PLL circuits. Use Value: 45µVRMS LDO noise and 155°C thermal shutdown ensure signal integrity and reliability in continuous operation; PGOOD delay aligns with DSP reset assertion timing. | Use Scenario: Powering barcode scanner engine (1.2V), MCU (1.5V), LCD backlight driver (3.3V), and RS-232 transceiver (2.9V) in ruggedized handheld terminal. IC Role / Device Role / Timing Role: Mini-PMIC serves as central power hub; independent enable/disable of each regulator supports modular subsystem power gating. Use Value: Factory-fixed outputs eliminate field calibration; 2.3V UVLO ensures robust operation down to depleted battery (≈2.5V), increasing usable battery capacity by 8%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023BRSBT | Triple 600mA buck + dual 260mA LDO; 2.25MHz switching; no I²C slew rate control; fixed 1.2V/1.5V/1.8V buck outputs. | Supports fewer output combinations; lacks fine-grained voltage ramp control needed for advanced DVFS. | Select when cost sensitivity outweighs need for programmable slew or higher LDO current. |
| RT8059ZSP | Dual 800mA buck only (no integrated LDOs); requires external LDOs for 3.3V/2.9V rails; 3MHz switching; I²C interface with 10mV/step resolution. | Increases BOM count and layout complexity; better suited for designs needing only core rails with custom LDO selection. | Select when LDO requirements are non-standard or when thermal budget favors separate LDO placement. |
Compared with TPS65023BRSBT and RT8059ZSP, the ISL9305IRTWBNLZ-T uniquely combines factory-configured 1.2V/1.5V/3.3V/2.9V outputs, I²C slew rate control, and active discharge in a single 4mm×4mm package - delivering optimal integration for space-constrained, battery-life-critical portable designs.
Availability
ISL9305IRTWBNLZ-T is available at Aetrix Electronics and suitable for smartphone power management, portable media player subsystems, and industrial handheld terminals requiring stable component supply and long-term lifecycle support.
Supply support for ISL9305IRTWBNLZ-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 microcontrollers, analog, power, and SoC products for automotive, industrial, infrastructure, and IoT applications.
The ISL9305 series belongs to Renesas' mini-PMIC product line, designed specifically for space- and efficiency-constrained portable electronics powered by single-cell Li-ion batteries.
FAQ
What are the factory-set output voltages for ISL9305IRTWBNLZ-T?
The ISL9305IRTWBNLZ-T has factory-preprogrammed output voltages: DCD1 = 1.2V, DCD2 = 1.5V, LDO1 = 3.3V, and LDO2 = 2.9V. These values are confirmed in the Ordering Information table (Page 4 of FN7605 Rev 2.00) and do not require external feedback resistors. The ISL9305IRTWBNLZ-T supports I²C reprogramming within its specified ranges (0.825–3.6V for bucks at 25mV/step; 0.9–3.6V for LDOs at 50mV/step), but defaults to these fixed values at power-on reset.
Does ISL9305IRTWBNLZ-T support forced PWM mode for noise-sensitive applications?
Yes, the ISL9305IRTWBNLZ-T supports forced PWM mode for both DCD1 and DCD2 via the DCD_PARAMETER register (bits B0 and B1). When enabled, the converters maintain constant 3MHz switching regardless of load current - eliminating audible switching noise and spectral artifacts common in skip (PFM) mode. This is especially valuable for powering RF sections or high-resolution audio circuits where variable-frequency operation could cause interference.
How is power-good signaling implemented on ISL9305IRTWBNLZ-T?
The ISL9305IRTWBNLZ-T uses an open-drain DCDPG pin to indicate combined power-good status of DCD1 and DCD2. When both outputs are within ±3% of their nominal voltages, the pin releases after a user-programmable delay (1–200 ms) to allow external pull-up. If either output falls outside regulation, DCDPG pulls low. The ISL9305IRTWBNLZ-T also supports single-channel monitoring - if only one DCD is enabled, DCDPG reflects only that channel's status.
What thermal management features does ISL9305IRTWBNLZ-T include?
The ISL9305IRTWBNLZ-T incorporates thermal shutdown at +155°C with +30°C hysteresis, automatically disabling all regulators until die temperature drops to ~130°C. Its 4mm×4mm TQFN package includes an exposed E-pad thermally connected to PCB ground via ≥9 vias (per Figure 4, Page 8), achieving θJA = 40.2°C/W. This enables reliable operation up to +85°C ambient when mounted on 2-layer boards with adequate copper area - critical for sealed portable enclosures.
Can ISL9305IRTWBNLZ-T actively discharge its buck outputs when disabled?
Yes, the ISL9305IRTWBNLZ-T includes an internal 115Ω bleeding resistor for each buck converter, enabled by default in the DCD_PARAMETER register (bits B2 and B3). When DCD1 or DCD2 is disabled via I²C, the corresponding output is actively discharged to near ground within milliseconds - preventing back-powering, latch-up, or unintended wake-up in multi-rail systems. This feature is hardware-configurable and does not require external components.
ISL9305IRTWBNLZ-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:
- 1.5V, 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)
ISL9305IRTWBNLZ-T FAQ
1.How can I place an order for ISL9305IRTWBNLZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9305IRTWBNLZ-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 ISL9305IRTWBNLZ-T reliable?
The price and inventory of ISL9305IRTWBNLZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9305IRTWBNLZ-T is usually 5 days.
3.What payment methods are accepted for ISL9305IRTWBNLZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9305IRTWBNLZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9305IRTWBNLZ-T?
ISL9305IRTWBNLZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9305IRTWBNLZ-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 ISL9305IRTWBNLZ-T?
For technical support, including ISL9305IRTWBNLZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9305IRTWBNLZ-T requirements.
6.How does Aetrix verify that ISL9305IRTWBNLZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9305IRTWBNLZ-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 ISL9305IRTWBNLZ-T meets industry standards.
7.What is the process for return or replacement of ISL9305IRTWBNLZ-T?
All ISL9305IRTWBNLZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9305IRTWBNLZ-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 ISL9305IRTWBNLZ-T part is unused and in its original packaging.
Return procedure for ISL9305IRTWBNLZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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