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Renesas ISL9307IRTAAJBZ-T
- Part No.:
- ISL9307IRTAAJBZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
ISL9307IRTAAJBZ-T.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,221
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Product details
Overview
ISL9307IRTAAJBZ-T from Intersil is a dual-buck + dual-LDO mini-PMIC for Li-ion/Li-polymer battery-powered systems, integrating two 1500mA/3MHz synchronous step-down converters (DCD1/DCD2) and two 300mA low-input LDOs (LDO1=2.8V, LDO2=1.5V). It supports power sequencing via independent EN pins and delivers high efficiency in skip mode at light loads.
For engineers reviewing the ISL9307IRTAAJBZ-T datasheet, ISL9307IRTAAJBZ-T pinout, ISL9307IRTAAJBZ-T application, or ISL9307IRTAAJBZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed LDO output voltages (2.8V/1.5V), exact TQFN-16 package mapping, and real-world sequencing behavior for smartphone and portable media SoC power rails.
Technical Context
The ISL9307IRTAAJBZ-T implements peak-current-mode PWM control for both DCD1 and DCD2, enabling fast transient response and pulse-by-pulse current limiting up to 1500mA per buck channel. Its 3MHz switching frequency allows use of compact 1.5µH inductors and low-ESR ceramic capacitors.
Each LDO accepts input from 1.5V to 5.5V-compatible with either battery or buck outputs-and features factory-fixed outputs (LDO1=2.8V, LDO2=1.5V), 125mV dropout at 300mA (for VO ≤ 2.1V), and 55dB PSRR at 1kHz. Independent enable pins support precise power-up sequencing across all four regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DCD Output Current | 1500mA per channel - supports core voltage rails for ARM Cortex-A/M series processors |
| LDO Output Voltages | LDO1 = 2.8V, LDO2 = 1.5V - factory-fixed, no external feedback resistors required |
| Switching Frequency | 3.0MHz ±0.4MHz - enables <3mm² total passive area per buck stage using 1.5µH inductors |
| Quiescent Current | 50µA typ (both bucks enabled, no load) - extends battery runtime in standby states |
| Input Voltage Range | VINDCD1/VINDCD2: 2.5–5.5V; VINLDO: 1.5–5.5V - compatible with single-cell Li-ion (2.8–4.2V) and buck-derived supplies |
| Thermal Shutdown | 155°C threshold with 30°C hysteresis - protects die during sustained overload or poor PCB thermal design |
| Package | 4mm × 4mm TQFN-16 with exposed thermal pad - requires 9-via thermal land for 40.2°C/W θJA performance |
Pinout & Package
ISL9307IRTAAJBZ-T uses a 4mm × 4mm, 16-lead Thin Quad Flat No-lead (TQFN) package with exposed thermal pad (JEDEC MO220K, drawing L16.4X4G). The E-pad must be soldered to system ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINDCD1 (Pin 1) | Buck converter DCD1 input supply | Primary power source for DCD1 and internal digital/analog circuits; 2.5–5.5V range |
| FB1 (Pin 2) | DCD1 feedback node | Connects to resistor divider for adjustable output; tied directly to VODCD1 for fixed-output versions like ISL9307IRTAAJBZ-T |
| ENDCD1 (Pin 3) | DCD1 enable control | Active-high logic; controls startup timing and sequencing of first buck channel |
| ENLDO1 (Pin 4) | LDO1 enable control | Active-high logic; enables 2.8V LDO independently for I/O or analog subsystems |
| VINLDO (Pin 5) | LDO1/LDO2 common input | Accepts 1.5–5.5V; may be supplied from battery or DCD1/DCD2 outputs |
| VOLDO1 (Pin 6) | LDO1 regulated output | Fixed 2.8V output; powers RF front-end or display interface circuitry |
| VOLDO2 (Pin 7) | LDO2 regulated output | Fixed 1.5V output; supplies memory I/O or sensor interfaces |
| ENLDO2 (Pin 8) | LDO2 enable control | Active-high logic; enables 1.5V rail separately for power domain isolation |
| GNDLDO (Pin 9) | LDO power ground | Dedicated ground return for both LDOs to minimize noise coupling into sensitive analog rails |
| ENDCD2 (Pin 10) | DCD2 enable control | Active-high logic; sequences second buck channel after DCD1 or LDOs |
| FB2 (Pin 11) | DCD2 feedback node | Connects to resistor divider for adjustable output; tied directly to VODCD2 for fixed-output versions |
| VINDCD2 (Pin 12) | Buck converter DCD2 input supply | Independent input for second buck; supports 2.3–VINDCD1 range |
| SW2 (Pin 13) | DCD2 switching node | Connects to inductor; high dv/dt node requiring short, wide trace routing away from noise-sensitive signals |
| GNDDCD2 (Pin 14) | DCD2 power ground | Dedicated ground return for DCD2 power loop to reduce EMI and improve stability |
| GNDDCD1 (Pin 15) | DCD1 power ground | Dedicated ground return for DCD1 power loop; separate from GNDLDO to prevent LDO noise injection |
| SW1 (Pin 16) | DCD1 switching node | Connects to inductor; high-frequency switching node requiring tight layout with minimal loop area |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3MHz synchronous buck converters | Enables ultra-compact DC/DC stages using 1.5µH inductors and 0603/0805 MLCCs - reduces board area by >40% vs. 1MHz designs |
| Factory-fixed LDO outputs (2.8V/1.5V) | Eliminates external feedback resistors and associated layout complexity; ensures production consistency across batches |
| Independent enable pins per regulator | Supports programmable power sequencing (e.g., LDO1 → DCD1 → DCD2 → LDO2) without external logic or timers |
| Active output discharge (115Ω bleed) | Forces rapid discharge of DCD1/DCD2 outputs when disabled - prevents floating voltages that could damage downstream logic |
| Low-dropout operation with 125mV max dropout | Maintains regulation down to VIN = VOUT + 125mV at 300mA - maximizes usable battery capacity in deep-discharge conditions |
Applications
| Smartphone Application | Portable Media Player |
|---|---|
Use Scenario: Powering application processor cores (e.g., Qualcomm Snapdragon, MediaTek Helio) and memory I/O in sub-10mm-thin handsets. IC Role / Device Role / Timing Role: Mini-PMIC delivering sequenced 1.2V/1.8V core and 2.8V/1.5V I/O rails from single Li-ion cell. Use Value: 3MHz switching minimizes inductor size; fixed LDO outputs eliminate BOM cost and layout risk for critical I/O domains. | Use Scenario: Supplying DSP, audio codec, and OLED display drivers in battery-constrained portable media players. IC Role / Device Role / Timing Role: Dual-buck + dual-LDO PMIC generating 1.2V DSP core, 1.8V memory, 2.8V audio bias, and 1.5V display interface rails. Use Value: Independent EN pins allow staggered startup to limit inrush current; skip mode extends playback time by >25% at light loads. |
| DSP Core Power System | Li-ion Battery-Powered Instrument |
Use Scenario: Providing tightly regulated, low-noise power to high-performance DSPs (e.g., TI C6000, Analog Devices SHARC) in portable test equipment. IC Role / Device Role / Timing Role: Buck converters supply dynamic core voltage; LDOs deliver clean 2.8V analog reference and 1.5V ADC interface rails. Use Value: 55dB PSRR at 1kHz suppresses switching noise from bucks, preserving signal integrity in 16-bit+ data acquisition paths. | Use Scenario: Power management for handheld medical or industrial instruments operating from 3.0–4.2V Li-ion packs with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: Integrated PMIC replacing discrete buck+LDO solutions to reduce component count and improve MTBF. Use Value: Thermal shutdown (155°C) and UVLO (2.2V on VINDCD1) ensure safe operation during battery aging or cold-temperature discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck + dual-LDO power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65910A3RSLR | 3.3V/1.8V fixed LDOs; 1.5A bucks; 2.2MHz switching; I²C programmability | Requires external I²C host; supports dynamic voltage scaling not available in ISL9307IRTAAJBZ-T | Select when firmware-controlled rail adjustment or telemetry is needed; avoid if pin-strapped simplicity is preferred |
| RT8070ZSP | Single 2A buck + dual 300mA LDOs; 2.5MHz; fixed 3.3V/1.2V LDOs; no independent EN pins | Lacks dual high-current bucks; no per-rail enable control limits sequencing flexibility | Select only for cost-sensitive, non-sequencing applications where one 2A rail suffices and LDO voltages match |
Compared with TPS65910A3RSLR and RT8070ZSP, the ISL9307IRTAAJBZ-T offers superior sequencing autonomy via four dedicated EN pins and higher switching frequency (3MHz vs. 2.2/2.5MHz), enabling smaller passives-but lacks I²C configurability and has fixed LDO outputs rather than programmable ones.
Availability
ISL9307IRTAAJBZ-T is available at Aetrix Electronics and suitable for smartphone power delivery, portable media player SoC supply, and Li-ion battery-powered instrumentation requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9307IRTAAJBZ-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
Intersil Corporation is a U.S.-based designer of high-performance analog semiconductors, specializing in power management and precision signal processing for mobile, computing, and industrial markets.
The ISL9307 product line was engineered specifically for space-constrained, battery-operated portable electronics requiring integrated multi-rail power with minimal external components and robust sequencing control.
FAQ
What are the fixed output voltages of the LDOs in ISL9307IRTAAJBZ-T?
The ISL9307IRTAAJBZ-T has factory-programmed fixed LDO outputs: LDO1 delivers 2.8V and LDO2 delivers 1.5V. These values are confirmed in the Ordering Information table (Page 4) and do not require external feedback resistors - simplifying layout and ensuring consistent performance across production units. Both LDOs accept input from 1.5V to 5.5V and maintain regulation with ≤125mV dropout at 300mA load.
Does ISL9307IRTAAJBZ-T support power sequencing, and how is it implemented?
Yes, ISL9307IRTAAJBZ-T supports precise power sequencing via four independent enable pins: ENDCD1, ENDCD2, ENLDO1, and ENLDO2. Each pin is active-high and controls startup timing for its respective regulator. This allows designers to implement custom sequencing orders (e.g., enabling LDO1 before DCD1) without external timers or logic. The datasheet confirms this capability in the Pin Descriptions (Page 3) and Typical Application Diagram (Page 1).
What package type and thermal characteristics does ISL9307IRTAAJBZ-T use?
ISL9307IRTAAJBZ-T uses a 4mm × 4mm, 16-lead TQFN package (drawing L16.4X4G) with an exposed thermal pad. Its typical junction-to-ambient thermal resistance (θJA) is 40.2°C/W when mounted on a high-thermal-conductivity board with nine vias under the E-pad. The device includes thermal shutdown at 155°C with 30°C hysteresis, and the recommended operating junction temperature range is –40°C to +125°C.
Can ISL9307IRTAAJBZ-T operate from a single Li-ion battery, and what is its input voltage range?
Yes, ISL9307IRTAAJBZ-T is explicitly designed for single Li-ion/Li-polymer battery operation. Its DCD1/DCD2 inputs accept 2.5V to 5.5V, covering the full discharge curve (2.8V–4.2V), while the LDO input (VINLDO) operates from 1.5V to 5.5V - allowing direct battery connection or derivation from buck outputs. Undervoltage lockout thresholds (2.2V for VINDCD1, ~1.4V for VINLDO) prevent malfunction during deep discharge.
How does ISL9307IRTAAJBZ-T improve light-load efficiency?
ISL9307IRTAAJBZ-T improves light-load efficiency by entering skip mode: when inductor current crosses zero for 16 consecutive cycles, the controller reduces switching frequency and regulates output by pulsing full-power cycles. This cuts switching losses significantly. Datasheet Figure 2 and Section "Theory of Operation" (Page 7) confirm skip mode activation, and quiescent current drops to 50µA typ with both bucks enabled and unloaded - extending battery life in standby or idle states.
ISL9307IRTAAJBZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
- Number of Outputs:
- 4
- Frequency - Switching:
- 3MHz
- Voltage/Current - Output 1:
- 0.8V ~ 5.5V, 1.5A
- Voltage/Current - Output 2:
- 0.8V ~ 5.5V, 1.5A
- Voltage/Current - Output 3:
- 2.8V, 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)
ISL9307IRTAAJBZ-T FAQ
1.How can I place an order for ISL9307IRTAAJBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9307IRTAAJBZ-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 ISL9307IRTAAJBZ-T reliable?
The price and inventory of ISL9307IRTAAJBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9307IRTAAJBZ-T is usually 5 days.
3.What payment methods are accepted for ISL9307IRTAAJBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9307IRTAAJBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9307IRTAAJBZ-T?
ISL9307IRTAAJBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9307IRTAAJBZ-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 ISL9307IRTAAJBZ-T?
For technical support, including ISL9307IRTAAJBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9307IRTAAJBZ-T requirements.
6.How does Aetrix verify that ISL9307IRTAAJBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9307IRTAAJBZ-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 ISL9307IRTAAJBZ-T meets industry standards.
7.What is the process for return or replacement of ISL9307IRTAAJBZ-T?
All ISL9307IRTAAJBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9307IRTAAJBZ-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 ISL9307IRTAAJBZ-T part is unused and in its original packaging.
Return procedure for ISL9307IRTAAJBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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