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Renesas ISL9305IRTHBCNLZ-T
- Part No.:
- ISL9305IRTHBCNLZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
ISL9305IRTHBCNLZ-T.pdf
- Description:
- IC REG QUAD BUCK/LNR 3MHZ 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,896
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Product details
Overview
ISL9305IRTHBCNLZ-T from Renesas (formerly Intersil) is a dual-buck + dual-LDO mini-PMIC for single-cell Li-ion/Li-polymer battery systems, integrating two 3MHz 1.5A synchronous step-down converters (DCD1 = 1.5V, DCD2 = 1.8V) and two I²C-programmable 300mA LDOs (LDO1 = 3.3V, LDO2 = 2.9V). It delivers precise, dynamically adjustable power to microprocessor core/logic rails in space-constrained portable devices.
For engineers reviewing the ISL9305IRTHBCNLZ-T datasheet, ISL9305IRTHBCNLZ-T pinout, ISL9305IRTHBCNLZ-T application, or ISL9305IRTHBCNLZ-T equivalent, key selection considerations include factory-fixed output voltages, 400kb/s I²C interface with on-the-fly slew rate control, skip-mode efficiency optimization, thermal shutdown at 155°C, and 4mm×4mm TQFN-16 packaging for high-density PCB layouts.
Technical Context
The ISL9305IRTHBCNLZ-T implements peak-current-mode PWM control for both buck converters, enabling fast transient response and pulse-by-pulse current limiting. Each converter supports programmable skip mode (PFM) under light load or forced PWM operation via I²C register control (DCD_PARAMETER[1:0]).
Its dual LDOs operate from 1.5V–5.5V input and deliver fixed factory-set outputs (3.3V/2.9V) with 50mV-step I²C reprogramming capability. The open-drain DCDPG pin provides programmable power-good monitoring (1–200ms delay) for system sequencing, while internal bleeding resistors (115Ω typ.) enable active output discharge upon disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DCD1 Output Voltage | Factory preset 1.5V - eliminates external feedback resistors and reduces BOM count for core rail supply. |
| DCD2 Output Voltage | Factory preset 1.8V - optimized for I/O or memory interface voltage in mobile SoC applications. |
| LDO1 / LDO2 Outputs | Factory preset 3.3V / 2.9V - supports analog peripherals, sensors, or RF biasing without external configuration. |
| Switching Frequency | 3.0MHz ±0.4MHz - enables use of compact 1.5µH inductors and low-ESR ceramic capacitors for minimal footprint. |
| I²C Interface Speed | 400kb/s standard-mode - allows real-time dynamic voltage scaling during processor DVFS transitions. |
| Quiescent Current | 50µA typ. (both bucks enabled, no load) - extends battery runtime in standby and low-power sleep states. |
| Thermal Shutdown | 155°C threshold with 30°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
ISL9305IRTHBCNLZ-T is housed in a 4mm × 4mm, 16-lead TQFN package with exposed thermal pad (PKG DWG L16.4x4G). The E-pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINDCD1 (Pin 1) | Main input supply for DCD1 and internal circuitry | Accepts 2.5V–5.5V; powers entire IC - requires local 10µF input capacitance for stability. |
| FB1 (Pin 2) | Feedback node for DCD1 | Internally connected to 1.5V reference; shorted to VOLDO1 in fixed-output version - no external resistor divider needed. |
| SCLK (Pin 3) | I²C clock input | Requires external pull-up to VDDIO (1.8V–3.3V); timing compliant with 400kb/s Fast-mode I²C spec. |
| SDAT (Pin 4) | I²C data bidirectional line | Open-drain structure; shares same pull-up as SCLK - enables host-controlled voltage reconfiguration and status reads. |
| VINLDO1 (Pin 5) | LDO1 input supply | May be fed from DCD1 output (1.5V), battery, or another regulator - supports dropout as low as 120mV @ 300mA. |
| VOLDO1 (Pin 6) | LDO1 regulated output (3.3V) | Fixed 3.3V output with ±3% accuracy; supplies USB PHY, SD card interface, or auxiliary logic rails. |
| VOLDO2 (Pin 7) | LDO2 regulated output (2.9V) | Fixed 2.9V output; commonly used for camera sensor bias, audio codec, or touch controller supply. |
| VINLDO2 (Pin 8) | LDO2 input supply | Independent input path - allows flexible sourcing from DCD2 (1.8V) or higher-voltage rail for optimal efficiency. |
| GNDLDO (Pin 9) | Power ground for both LDOs | Separate ground return minimizes noise coupling between LDOs and switching converters. |
| DCDPG (Pin 10) | Open-drain DCD power-good indicator | Signals valid DCD1/DCD2 outputs after programmable 1–200ms delay - critical for safe processor boot sequencing. |
| FB2 (Pin 11) | Feedback node for DCD2 | Internally tied to 1.8V reference; shorted to VOLDO2 - eliminates external components for fixed 1.8V output. |
| VINDCD2 (Pin 12) | Input supply for DCD2 | Accepts 2.5V–VINDCD1; may share input with DCD1 or use independent path for noise isolation. |
| SW2 (Pin 13) | DCD2 switching node | Connects directly to one end of 1.5µH inductor - requires tight layout and Kelvin grounding to minimize EMI. |
| GNDDCD2 (Pin 14) | Power ground for DCD2 | Dedicated ground return path - routed separately from GNDDCD1 to prevent cross-talk between buck stages. |
| GNDDCD1 (Pin 15) | Power ground for DCD1 | Low-impedance return for high di/dt currents - must connect to E-pad via multiple vias for thermal and electrical performance. |
| SW1 (Pin 16) | DCD1 switching node | Connects directly to one end of 1.5µH inductor - layout symmetry with SW2 improves EMI balance in dual-buck topology. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 1.5A 3MHz synchronous buck converters | Enables ultra-compact DC/DC stage with <10mm² total passive area - ideal for smartphones and wearables. |
| I²C-programmable output voltage slew rate | Configurable from 0.225 to 28.8 mV/µs - prevents overshoot/undershoot during dynamic voltage scaling in CPU DVFS. |
| Factory-fixed output voltages (1.5V/1.8V/3.3V/2.9V) | Eliminates four external feedback resistors and associated layout area - reduces design cycle time and test complexity. |
| Programmable DCD power-good delay (1–200ms) | Allows precise coordination of processor reset release, memory initialization, and peripheral enable sequencing. |
| Active output discharge via internal 115Ω bleeding resistor | Ensures rapid, controlled discharge of DCD outputs during shutdown - prevents floating rails and latch-up in downstream logic. |
| Thermal shutdown with 30°C hysteresis | Prevents thermal runaway under sustained overload while avoiding nuisance cycling near trip threshold. |
Applications
| Smartphone Application | Wearable System Power |
|---|---|
|
Use Scenario: Powering application processor core (1.5V), GPU I/O (1.8V), USB PHY (3.3V), and ambient light sensor (2.9V) from single Li-ion cell. IC Role / Device Role / Timing Role: Mini-PMIC providing four independent, sequenced, and dynamically controllable voltage rails with integrated power-good signaling. Use Value: Reduces total solution size by >30% vs discrete regulators; enables sub-100ms cold boot via programmable DCDPG delay. |
Use Scenario: Supplying MCU core (1.5V), BLE radio (1.8V), display driver (3.3V), and heart-rate sensor (2.9V) in compact fitness tracker. IC Role / Device Role / Timing Role: Single-chip power manager delivering low-noise, low-quiescent LDOs alongside efficient high-frequency bucks for mixed-signal operation. Use Value: Achieves >85% efficiency at 10mA load (skip mode) and <50µA quiescent current - extends battery life to 7+ days. |
| Portable Medical Instrument | DSP-Based Audio Player |
|
Use Scenario: Powering low-noise ADC front-end (2.9V LDO), digital controller (1.5V buck), communication interface (3.3V LDO), and signal chain (1.8V buck) in handheld ECG device. IC Role / Device Role / Timing Role: Integrated power solution minimizing conducted EMI and supply ripple to preserve analog measurement integrity. Use Value: LDO PSRR >55dB @ 1kHz and buck output ripple <15mVpp ensure <12-bit ENOB in 24-bit ADC measurements. |
Use Scenario: Delivering clean, sequenced power to DSP core (1.5V), audio DAC (1.8V), headphone amp (3.3V), and MEMS microphone bias (2.9V) in portable music player. IC Role / Device Role / Timing Role: Dual-buck + dual-LDO architecture isolating noisy digital supplies from sensitive analog audio paths. Use Value: Separate GNDLDO and GNDDCD grounds reduce inter-rail coupling; LDO output noise <45µVRMS preserves SNR >105dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Triple 2.5A/1.8A/1.8A bucks + single 300mA LDO; 2.5–5.5V input; no I²C slew rate control; 200kHz–1.2MHz switching. | Higher current capability but larger solution size; lacks fine-grained voltage ramp control for DVFS. | Preferred when >1.5A per rail or wider input range (up to 5.5V) is required; less suitable for tight EMI-constrained layouts. |
| RT5782AZSP | Dual 2A bucks + dual 300mA LDOs; 2.5–5.5V input; I²C interface; 2.5MHz switching; fixed 1.2V/1.8V/3.3V/1.2V outputs. | Higher buck current rating and identical feature set, but fixed LDO2 at 1.2V instead of 2.9V. | Valid alternative if 1.2V LDO suffices for target peripheral; verify compatibility with 2.9V-dependent sensors or interfaces. |
Compared with TPS65023RSBR and RT5782AZSP, the ISL9305IRTHBCNLZ-T offers tighter factory-set voltage matching (1.5V/1.8V/3.3V/2.9V), superior light-load efficiency via skip mode, and finer 25mV I²C voltage steps - making it optimal for Li-ion-powered portable devices requiring precise rail alignment and minimal footprint.
Availability
ISL9305IRTHBCNLZ-T is available at Aetrix Electronics and suitable for smartphone power management, wearable system integration, and portable medical instrumentation requiring stable component supply across production lifecycles.
Supply support for ISL9305IRTHBCNLZ-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 Corporation is a global semiconductor leader delivering trusted embedded design innovation, with deep expertise in power management, microcontrollers, and analog solutions.
The ISL9305H family was designed specifically for space-constrained, battery-powered portable electronics - integrating dual high-frequency bucks and dual LDOs into a single miniature package to replace multiple discrete regulators.
FAQ
What are the factory-programmed output voltages of the ISL9305IRTHBCNLZ-T?
The ISL9305IRTHBCNLZ-T has factory-set outputs: DCD1 = 1.5V, DCD2 = 1.8V, LDO1 = 3.3V, and LDO2 = 2.9V. These values are laser-trimmed during manufacturing and require no external resistors. The ISL9305IRTHBCNLZ-T supports I²C reprogramming of all four outputs within defined ranges (e.g., DCD1/DCD2: 0.825–3.6V at 25mV/step), but defaults to these fixed values at power-up unless modified via register writes.
Does the ISL9305IRTHBCNLZ-T support forced PWM mode for noise-sensitive applications?
Yes, the ISL9305IRTHBCNLZ-T supports forced PWM mode for both DCD1 and DCD2 via I²C register control (DCD_PARAMETER[1:0] bits). When enabled, the converters maintain constant 3MHz switching frequency regardless of load - eliminating audible noise and spectral artifacts common in skip mode, which is essential for audio, imaging, and precision analog subsystems.
How is power sequencing managed on the ISL9305IRTHBCNLZ-T?
Power sequencing is managed through the open-drain DCDPG pin (Pin 10), which asserts high only after both DCD1 and DCD2 outputs reach regulation within ±3%. Its delay is programmable from 1ms to 200ms via SYS_PARAMETER[5:4] bits. This allows precise coordination with processor reset deassertion and peripheral initialization - a critical function not handled by the ISL9305IRTHBCNLZ-T's internal logic alone but enabled via this hardware signal.
Can the ISL9305IRTHBCNLZ-T operate from a single 3.7V Li-ion cell throughout its full discharge curve?
Yes. The ISL9305IRTHBCNLZ-T supports input voltages from 2.5V to 5.5V on VINDCD1/VINDCD2 and 1.5V to 5.5V on VINLDO1/VINLDO2. With DCD1 set to 1.5V and DCD2 to 1.8V, both converters remain functional down to ~2.0V input (accounting for dropout), covering the full 4.2V–2.8V Li-ion discharge range. Its 3MHz operation maintains regulation even at low VIN due to short minimum on-time (70ns).
What thermal protection features does the ISL9305IRTHBCNLZ-T include?
The ISL9305IRTHBCNLZ-T integrates thermal shutdown at +155°C with +30°C hysteresis (re-enable at ~+125°C). This protects against sustained overload, poor PCB thermal design, or ambient temperature excursions. The thermal sensor monitors die temperature directly; shutdown is immediate and comprehensive - disabling all regulators and I²C interface until safe temperature is restored. No external thermal components are required.
ISL9305IRTHBCNLZ-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, 1.5A
- Voltage/Current - Output 2:
- 1.8V, 1.5A
- Voltage/Current - Output 3:
- 3.3V, 300mA
- 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)
ISL9305IRTHBCNLZ-T FAQ
1.How can I place an order for ISL9305IRTHBCNLZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9305IRTHBCNLZ-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 ISL9305IRTHBCNLZ-T reliable?
The price and inventory of ISL9305IRTHBCNLZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9305IRTHBCNLZ-T is usually 5 days.
3.What payment methods are accepted for ISL9305IRTHBCNLZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9305IRTHBCNLZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9305IRTHBCNLZ-T?
ISL9305IRTHBCNLZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9305IRTHBCNLZ-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 ISL9305IRTHBCNLZ-T?
For technical support, including ISL9305IRTHBCNLZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9305IRTHBCNLZ-T requirements.
6.How does Aetrix verify that ISL9305IRTHBCNLZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9305IRTHBCNLZ-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 ISL9305IRTHBCNLZ-T meets industry standards.
7.What is the process for return or replacement of ISL9305IRTHBCNLZ-T?
All ISL9305IRTHBCNLZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9305IRTHBCNLZ-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 ISL9305IRTHBCNLZ-T part is unused and in its original packaging.
Return procedure for ISL9305IRTHBCNLZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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