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Renesas ISL9305IRTHWLNCZ-T
- Part No.:
- ISL9305IRTHWLNCZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
ISL9305IRTHWLNCZ-T.pdf
- Description:
- IC REG QUAD BUCK/LNR 3MHZ 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,238
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Product details
Overview
ISL9305IRTHWLNCZ-T from Renesas (formerly Intersil) is a dual-buck + dual-LDO mini-PMIC for single-cell Li-ion/Li-polymer battery systems. It integrates two 3MHz, 1.5A synchronous step-down converters (DCD1 = 1.2V, DCD2 = 2.9V) and two I²C-programmable LDOs (LDO1 = 3.3V, LDO2 = 1.8V), delivering precise rail sequencing and dynamic voltage scaling in space-constrained portable electronics.
For engineers reviewing the ISL9305IRTHWLNCZ-T datasheet, ISL9305IRTHWLNCZ-T pinout, ISL9305IRTHWLNCZ-T application, or ISL9305IRTHWLNCZ-T equivalent, key selection criteria include factory-fixed output voltages, 400kb/s I²C interface with on-the-fly slew rate control, skip-mode efficiency optimization, and 4mm×4mm TQFN-16 thermal performance under -40°C to +85°C industrial operation.
Technical Context
The ISL9305IRTHWLNCZ-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 ultra-small 1.5µH inductors and low-ESR ceramic capacitors, minimizing board area while maintaining stable regulation across 2.5V–5.5V input range.
I²C programmability extends beyond voltage setting: DCD1/DCD2 can be individually configured for skip mode (PFM) or forced PWM operation; active output discharge (115Ω bleed resistor) is enabled by default per channel; and DCDPG provides programmable power-good delay (1–200ms) with open-drain logic output tied to both converter outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DCD1 Output Voltage | Factory fixed at 1.2V - eliminates external feedback resistors and ensures production-ready stability for core logic rails. |
| DCD2 Output Voltage | Factory fixed at 2.9V - optimized for memory or interface I/O supply without calibration overhead. |
| LDO1 / LDO2 Outputs | Factory fixed at 3.3V / 1.8V - supports mixed-signal subsystems requiring clean, low-noise biasing independent of buck switching noise. |
| I²C Interface Speed | 400kb/s - enables real-time dynamic voltage scaling during processor DVFS transitions without bus contention. |
| Quiescent Current (All Enabled) | 100–130µA typical - maximizes standby time in always-on mobile applications with multiple active rails. |
| Thermal Shutdown Threshold | 155°C with 30°C hysteresis - protects against sustained overload or poor PCB thermal design in sealed enclosures. |
| Package | 16-pin 4mm×4mm TQFN with exposed pad - delivers θJA = 40.2°C/W for high-power-density integration in thin-profile handheld devices. |
Pinout & Package
ISL9305IRTHWLNCZ-T is housed in a 4mm × 4mm, 16-lead TQFN package with exposed thermal pad (PKG DWG # L16.4x4G). The exposed pad must be soldered to system ground for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINDCD1 (Pin 1) | Main input supply for DCD1 and internal circuitry | Accepts 2.5–5.5V; powers entire IC analog/digital blocks - must be decoupled with ≥10µF ceramic capacitor. |
| FB1 (Pin 2) | Feedback node for DCD1 | Internally connected to 1.2V reference; shorted to VODCD1 in fixed-output version - no external resistor divider required. |
| SCLK (Pin 3) | I²C clock input | 400kb/s compliant; requires external pull-up to VDDIO (1.8–3.3V); timing aligned to standard I²C specification. |
| SDAT (Pin 4) | I²C data bidirectional line | Open-drain; shares same pull-up as SCLK; supports read/write register access including DCD/LDO voltage and mode control. |
| VINLDO1 (Pin 5) | Input for LDO1 | Supplied from DCD1, DCD2, or battery directly; operates down to 1.5V - enables flexible rail stacking architecture. |
| VOLDO1 (Pin 6) | LDO1 regulated output | Fixed 3.3V @ up to 300mA; dropout ≤200mV at full load - suitable for USB PHY, SD card, or sensor interface power. |
| VOLDO2 (Pin 7) | LDO2 regulated output | Fixed 1.8V @ up to 300mA; PSRR ≥55dB @ 1kHz - ideal for ADC reference, PLL VCO, or low-noise analog circuitry. |
| VINLDO2 (Pin 8) | Input for LDO2 | Independent input path allows separate sourcing (e.g., DCD2 for 2.9V → LDO2 for 1.8V) to minimize noise coupling. |
| GNDLDO (Pin 9) | Power ground for both LDOs | Dedicated ground return minimizes LDO output noise injection into buck converter grounds. |
| DCDPG (Pin 10) | Open-drain power-good indicator | Asserts high after programmable 1–200ms delay when both DCD1 & DCD2 outputs are within ±3% of nominal - used for system reset sequencing. |
| FB2 (Pin 11) | Feedback node for DCD2 | Internally tied to 2.9V reference; shorted to VODCD2 - eliminates layout sensitivity and component count for fixed-output use. |
| VINDCD2 (Pin 12) | Input supply for DCD2 | Accepts 2.5V to VINDCD1; supports independent input sourcing (e.g., separate battery tap or post-DCD1 rail). |
| SW2 (Pin 13) | DCD2 switching node | Connects directly to one terminal of 1.5µH inductor; requires tight loop layout with low-ESR output capacitor to suppress EMI. |
| GNDDCD2 (Pin 14) | Power ground for DCD2 | Separate ground return path prevents switching noise from modulating DCD1 regulation accuracy. |
| GNDDCD1 (Pin 15) | Power ground for DCD1 | Isolated ground plane connection critical for achieving <3% output voltage accuracy under dynamic load steps. |
| SW1 (Pin 16) | DCD1 switching node | High dv/dt node; must be routed away from sensitive analog traces (e.g., FB1, SDAT) to avoid coupling-induced errors. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 1.5A 3MHz synchronous buck converters | Enables compact DC/DC stage using 1.5µH inductors and 1µF/10µF ceramic caps - reduces solution size by >40% vs. 1MHz alternatives. |
| I²C-controlled output voltage slew rate | Configurable from 0.225 mV/µs to 28.8 mV/µs - prevents overshoot/undershoot during DVFS transitions in ARM Cortex-A series processors. |
| Programmable DCD power-good delay (1–200ms) | Allows precise coordination with SoC reset assertion and firmware initialization sequence - eliminates need for external timers or RC delays. |
| Active output discharge (115Ω bleed resistor) | Forces rapid discharge of DCD1/DCD2 outputs upon disable - prevents floating rails that could cause latch-up in downstream logic. |
| Separate ground pins for DCD1, DCD2, and LDOs | Minimizes ground bounce coupling between switching and linear regulators - maintains LDO PSRR >55dB and output noise <45µVRMS. |
Applications
| Mobile Application Processor Power | Multi-Rail Sensor Hub |
|---|---|
Use Scenario: Powering ARM-based application processors (e.g., Qualcomm Snapdragon, MediaTek Helio) in smartphones with dynamic core voltage scaling. IC Role / Device Role / Timing Role: Provides tightly sequenced 1.2V CPU core, 2.9V GPU/memory I/O, 3.3V peripheral interface, and 1.8V sensor interface rails via integrated buck+LDO architecture. Use Value: Eliminates four discrete regulators and associated passives; factory-fixed outputs reduce BOM cost and qualification time by removing trimming components. | Use Scenario: Supplying heterogeneous sensors (IMU, barometer, ambient light) in wearables where EMI-sensitive analog front-ends coexist with digital processing. IC Role / Device Role / Timing Role: Delivers ultra-low-noise 1.8V LDO2 for ADC reference and 3.3V LDO1 for digital I/O, while DCD1/DCD2 power MCU and RF transceiver independently. Use Value: Dedicated LDO grounds and >55dB PSRR suppress switching noise from buck stages - improves sensor measurement SNR by ≥8dB. |
| Li-ion Battery-Powered Medical Monitor | DSP Core + Analog Front-End System |
Use Scenario: Portable ECG or pulse oximeter requiring long battery life, clinical-grade signal integrity, and cold-temperature operation. IC Role / Device Role / Timing Role: Manages single-cell battery (2.8–4.2V) to generate stable 1.2V DSP core, 2.9V display driver, 3.3V communication interface, and 1.8V analog signal chain supplies. Use Value: Skip-mode operation extends runtime >35% at light loads; -40°C to +85°C rating ensures reliability in field-deployed units. | Use Scenario: Industrial motor control or audio processing DSP with precision analog acquisition (e.g., TI C55xx, ADI SHARC). IC Role / Device Role / Timing Role: Supplies 1.2V DSP core (DCD1), 2.9V I/O buffer (DCD2), 3.3V codec interface (LDO1), and 1.8V ADC reference (LDO2) with independent enable/disable control. Use Value: I²C programmability allows runtime adjustment of DCD1 voltage during algorithm load changes - reducing average power by up to 22%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023BRSBR | Triple 1.5A buck + triple LDO; 2.7–5.5V input; no I²C slew rate control; fixed 1.2V/1.5V/1.8V bucks | Targeted at OMAP3/DM365 platforms; lacks dynamic voltage ramp control needed for modern ARM DVFS | Select when fixed-voltage, non-DVFS SoC power is sufficient and I²C configurability is not required. |
| RT5782AZSP | Dual 2A buck + dual 300mA LDO; 2.5–5.5V input; I²C interface; 1.2V/2.8V factory-fixed bucks (matching ISL9305IRTHWLNCZ-T's DCD1/DCD2) | Higher current capability per buck; identical LDO voltage setpoints; supports 1.2V/2.8V/3.3V/1.8V rail combination | Preferred for designs needing >1.5A per buck or tighter thermal margin; pinout and register map differ - requires layout and firmware update. |
Compared with TPS65023BRSBR and RT5782AZSP, the ISL9305IRTHWLNCZ-T uniquely combines factory-matched 1.2V/2.9V/3.3V/1.8V outputs with per-rail I²C slew rate control and programmable DCDPG delay - making it optimal for space-constrained, DVFS-enabled portable systems where rail coordination and noise isolation are critical.
Availability
ISL9305IRTHWLNCZ-T is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor hubs, and portable medical monitors requiring stable component supply across high-volume production cycles and extended product lifecycles.
Supply support for ISL9305IRTHWLNCZ-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 (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog power management, and connectivity solutions for automotive, industrial, and consumer markets.
The ISL9305H product line was designed specifically for miniaturized, battery-powered portable electronics requiring highly integrated, low-quiescent-current power delivery with factory-configurable and I²C-tunable voltage rails.
FAQ
What are the factory-set output voltages for ISL9305IRTHWLNCZ-T?
The ISL9305IRTHWLNCZ-T has factory-programmed output voltages: DCD1 = 1.2V, DCD2 = 2.9V, LDO1 = 3.3V, and LDO2 = 1.8V. These values are laser-trimmed during manufacturing and require no external feedback components - ensuring consistent performance across production lots without calibration.
Does ISL9305IRTHWLNCZ-T support I²C-based dynamic voltage scaling (DVS)?
Yes, the ISL9305IRTHWLNCZ-T supports full I²C-based DVS: DCD1 and DCD2 output voltages are programmable from 0.825V to 3.6V in 25mV steps, with configurable slew rates (0.225–28.8 mV/µs). This enables precise, glitch-free voltage transitions during processor frequency scaling events.
Can ISL9305IRTHWLNCZ-T operate from a single Li-ion cell across its full discharge range?
Yes, ISL9305IRTHWLNCZ-T supports input voltages from 2.5V to 5.5V. Its DCD1 and DCD2 feature 100% duty-cycle low-dropout operation, allowing regulation down to battery voltages as low as 2.8V - covering the full operational range of a standard Li-ion cell (2.8V–4.2V).
How is power-good signaling implemented on ISL9305IRTHWLNCZ-T?
The ISL9305IRTHWLNCZ-T uses the open-drain DCDPG pin to indicate combined status of DCD1 and DCD2 outputs. It asserts high after a user-programmable delay (1–200ms) when both outputs remain within ±3% of their nominal values - providing reliable reset coordination for host processors.
What thermal performance can be expected from ISL9305IRTHWLNCZ-T in a 4-layer PCB?
In a standard 4-layer PCB with 1oz copper and 200mm² thermal pad copper pour, the ISL9305IRTHWLNCZ-T achieves θJA ≈ 40°C/W. At full 1.5A load per buck and 300mA per LDO, junction temperature rise remains below 60°C above ambient - well within the -40°C to +125°C recommended operating range.
ISL9305IRTHWLNCZ-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, 1.5A
- Voltage/Current - Output 2:
- 2.9V, 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)
ISL9305IRTHWLNCZ-T FAQ
1.How can I place an order for ISL9305IRTHWLNCZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9305IRTHWLNCZ-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 ISL9305IRTHWLNCZ-T reliable?
The price and inventory of ISL9305IRTHWLNCZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9305IRTHWLNCZ-T is usually 5 days.
3.What payment methods are accepted for ISL9305IRTHWLNCZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9305IRTHWLNCZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9305IRTHWLNCZ-T?
ISL9305IRTHWLNCZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9305IRTHWLNCZ-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 ISL9305IRTHWLNCZ-T?
For technical support, including ISL9305IRTHWLNCZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9305IRTHWLNCZ-T requirements.
6.How does Aetrix verify that ISL9305IRTHWLNCZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9305IRTHWLNCZ-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 ISL9305IRTHWLNCZ-T meets industry standards.
7.What is the process for return or replacement of ISL9305IRTHWLNCZ-T?
All ISL9305IRTHWLNCZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9305IRTHWLNCZ-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 ISL9305IRTHWLNCZ-T part is unused and in its original packaging.
Return procedure for ISL9305IRTHWLNCZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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