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Renesas ISL95338HRTZ-T
- Part No.:
- ISL95338HRTZ-T
- Manufacturer:
- Renesas
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
ISL95338HRTZ-T.pdf
- Description:
- IC REG BUCK BOOST ADJ 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,389
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Product details
Overview
ISL95338HRTZ-T from Renesas is a bidirectional buck-boost voltage regulator supporting 3.8V–24V input and up to 20V regulated output in both forward (ADP→SYS) and reverse (SYS→ADP) directions, with SMBus/I²C programmability, R3™ modulator architecture for fast transient response, and integrated OCP/OVP/UVP/OTP protection. It enables flexible power routing in USB-C PD systems, power banks, and ultrabooks.
For engineers reviewing the ISL95338HRTZ-T datasheet, ISL95338HRTZ-T pinout, ISL95338HRTZ-T application, or ISL95338HRTZ-T equivalent, this page delivers verified technical context, validated pin functions, confirmed bidirectional regulation parameters, real-world use-value per application, and two rigorously cross-checked alternative parts with documented functional and packaging differences.
Technical Context
The ISL95338HRTZ-T implements dual synchronous buck-boost topology using four external MOSFETs (Q1–Q4), with independent gate drivers (UGATE1/LGATE1/UGATE2/LGATE2), phase nodes (PHASE1/PHASE2), and current-sense inputs (CSIP/CSON/CSOP/CSIN) for precise bidirectional current regulation. Its R3™ modulator dynamically transitions between DCM and CCM without discontinuity.
It features dual error amplifiers (COMPF/COMPR), programmable soft-start via REF pin, SMBus-addressable registers (ADDR0/ADDR1), and open-drain status outputs (FRWPG/RVSPG/PROCHOT#) tied to forward/reverse enable logic (FRWEN/RVSEN). Protection is implemented at silicon level with hardware comparators for OVP/UVP thresholds and thermal shutdown at 140–160°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Bidirectional synchronous buck-boost with four external MOSFETs and dual-phase control |
| Input Voltage Range | 3.8V to 24V - supports USB PD, travel adapters, and wide-range DC sources without dead zone |
| Output Voltage Range | Programmable up to 20V in both forward and reverse directions via resistor dividers on VOUTS/ADPS |
| Switching Frequency | Up to 1MHz - enables compact LC filter design with reduced inductor size and improved transient response |
| Control Interface | SMBus/I²C-compatible serial interface - allows runtime programming of output voltage, current limits, PROCHOT# thresholds, and soft-start timing |
| Protection Features | Hardware-enforced OCP, OVP, UVP (on ADP and VOUTS/ADPS rails), OTP (140–160°C), and bidirectional internal discharge |
| Package | 32-lead 4mm × 4mm TQFN - thermally enhanced with exposed bottom pad for junction-to-board heat transfer (θJC = 2°C/W) |
Pinout & Package
ISL95338HRTZ-T is housed in a 32-lead, 4mm × 4mm, 0.5mm pitch TQFN package (RoHS-compliant, MSL3, Pkg. Dwg. L32.4x4D) with an exposed thermal pad on the underside for PCB-level heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Bottom Pad) | Signal and thermal reference | Primary return path for all analog/digital circuits; must be soldered to large copper pour for thermal management and noise control |
| CSOP / CSON | Forward output current sense inputs | Differential pair measuring VOUT current via external shunt; requires 0.1µF ceramic capacitor across pins for EMI filtering |
| VOUTS | Forward system-side feedback | Connects to resistor divider from VOUT to set regulated forward output voltage (e.g., 12V, 20V) |
| BOOT1 / BOOT2 | High-side gate driver bootstrap supplies | Each powers respective high-side driver (UGATE1/UGATE2); requires MLCC capacitor to PHASE1/PHASE2 for charge replenishment |
| UGATE1 / LGATE1 / UGATE2 / LGATE2 | Four independent MOSFET gate drivers | Drive external Q1–Q4; support 1.3–2.8A sink/source with <40ns dead-time control to prevent shoot-through |
| ADPS | Reverse adapter-side feedback | Resistor divider input to configure reverse-mode output voltage (e.g., 5V, 9V, 15V from system battery) |
| CSIP / CSIN | Adapter-side current sense inputs | Differential sensing of ADP input current; used for forward OCP and PROCHOT# generation |
| FRWEN / RVSEN | Directional enable inputs | Analog FRWEN > 0.8V enables forward mode; digital RVSEN high enables reverse mode - both can be controlled by host MCU |
| SCL / SDA | SMBus/I²C interface | Open-drain bus requiring 10kΩ pull-ups; supports auto-increment reads/writes for register configuration and telemetry |
| PROCHOT#, FRWPG, RVSPG | Status indicator outputs | Open-drain signals pulled low to alert host of overcurrent (PROCHOT#) or active regulation direction (FRWPG/RVSPG) |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional regulation with bypass mode | Enables seamless power flow in either direction while supporting lossless conduction path when regulation not required |
| R3™ modulator architecture | Delivers <10µs load transient recovery and continuous DCM/CCM transition - critical for dynamic USB-C PD negotiation |
| Programmable soft-start via REF pin | Soft-start time set by external capacitor on REF pin - prevents inrush current during power-up in both forward and reverse modes |
| Integrated LDO outputs (VDD/VDDP) | VDD provides 4.5–5.5V bias for internal circuitry; VDDP powers gate drivers - eliminates need for external bias rails |
| System status alert function | PROCHOT# assertion triggers host CPU throttling; FRWPG/RVSPG provide real-time directional activity confirmation for firmware state machines |
| Bidirectional internal discharge | Actively discharges ADP and VOUT rails when disabled - ensures safe hot-plug behavior and meets USB-C PD discharge requirements |
Applications
| USB-C Power Delivery (PD) Source/Sink | Portable Power Bank with Dual-Port Charging |
|---|---|
Use Scenario: A laptop negotiates variable voltage (5V/9V/15V/20V) from a USB-C PD charger, then reverses direction to power peripherals or charge another device. IC Role / Device Role: ISL95338HRTZ-T acts as the bidirectional voltage regulator controlling power flow between adapter port and system battery rail. Use Value: Enables single-chip implementation of USB-C PD 3.0 dual-role port with programmable voltage/current limits and hardware-based safety enforcement. |
Use Scenario: A 20,000mAh power bank charges from a 20V PD adapter and simultaneously delivers 5V/3A to a smartphone via USB-A port. IC Role / Device Role: ISL95338HRTZ-T regulates adapter input to charge internal Li-ion cells (forward mode), then converts cell voltage to stable 5V output (reverse mode). Use Value: Eliminates separate buck and boost ICs - reduces BOM count, PCB area, and thermal complexity while maintaining ±1% output accuracy. |
| Ultrabook Adaptive Power Routing | Tablet System Power Management |
Use Scenario: An ultrabook switches between AC adapter and battery power without interruption, dynamically adjusting system rail voltage based on workload and thermal headroom. IC Role / Device Role: ISL95338HRTZ-T manages bidirectional energy transfer between ADP and SYS rails, enabling seamless switchover and adaptive voltage scaling. Use Value: Supports Intel's Dynamic Platform and Thermal Framework (DPTF) via PROCHOT# signaling and SMBus telemetry for real-time power budgeting. |
Use Scenario: A tablet uses its battery to power USB-C accessories (keyboard, display) while simultaneously accepting charge from a PD source. IC Role / Device Role: ISL95338HRTZ-T serves as the core bidirectional regulator interfacing battery, USB-C port, and system PMIC. Use Value: Provides hardware-enforced current limiting and overvoltage protection on both sides - satisfies IEC 62368-1 safety requirements without additional discrete protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8857 from Monolithic Power Systems | Single-direction (forward-only) buck-boost; no reverse regulation capability; 2.5–24V input, 0.8–24V output; integrated MOSFETs; no SMBus interface | Cannot support USB-C DRP or power-bank reverse discharge; suitable only for fixed-direction adapter-to-system conversion | Select MP8857 only when reverse-mode operation is unnecessary and board space constraints favor integrated FETs over discrete layout flexibility |
| TPS65988 from Texas Instruments | USB-C PD controller with integrated buck-boost regulator (up to 20V); supports full PD 3.1 specification; includes Type-C port logic, CC detection, and VCONN; SMBus + GPIO interface | Higher integration but less flexible for non-USB-C applications; requires companion MCU for custom non-PD protocols; larger footprint (40-pin QFN) | Choose TPS65988 when full USB-C PD compliance, CC logic, and VCONN generation are required - not for generic bidirectional DC-DC where protocol independence is preferred |
Compared with MP8857 and TPS65988, the ISL95338HRTZ-T uniquely delivers true hardware-based bidirectional regulation with independent forward/reverse enable control, external MOSFET flexibility for efficiency optimization, and SMBus programmability without embedded USB-C protocol stack - making it optimal for custom PD-adjacent or industrial bidirectional power architectures.
Availability
ISL95338HRTZ-T is available at Aetrix Electronics and suitable for USB-C PD implementations, portable power banks, ultrabooks, and tablet system power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL95338HRTZ-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 solutions for automotive, industrial, and computing markets, with emphasis on high-reliability, low-power, and mixed-signal integration.
The ISL95338HRTZ-T belongs to Renesas' advanced power management portfolio designed specifically for bidirectional USB-C PD and portable system power routing - emphasizing programmability, hardware safety, and thermal robustness in space-constrained designs.
FAQ
What is the operating temperature range for the ISL95338HRTZ-T?
The ISL95338HRTZ-T is rated for ambient operation from -10°C to +100°C, with junction temperature supported up to +125°C. Its thermal resistance θJC is 2°C/W, enabling efficient heat transfer through the exposed bottom pad to the PCB. This range aligns with industrial and consumer portable applications including power banks and ultrabooks where ambient conditions vary significantly. The ISL95338HRTZ-T incorporates hardware-based over-temperature protection that triggers at 140–160°C.
Does the ISL95338HRTZ-T support both forward and reverse voltage regulation simultaneously?
No - the ISL95338HRTZ-T supports bidirectional regulation but not simultaneous forward and reverse operation. Forward mode (ADP→SYS) and reverse mode (SYS→ADP) are mutually exclusive and controlled independently via FRWEN (analog) and RVSEN (digital) pins. When both are asserted, the device defaults to forward mode priority. This ensures deterministic power-path control essential for USB-C PD role negotiation and avoids conflicting regulation loops.
How is output voltage programmed on the ISL95338HRTZ-T in forward and reverse modes?
In forward mode, output voltage is set by an external resistor divider connected to the VOUTS pin; in reverse mode, it is set via a divider on the ADPS pin. Both voltages are also programmable in real time via SMBus registers: Forward Regulating Voltage Register (0x20–0x21) and Reverse Regulating Voltage Register (0x30–0x31). The ISL95338HRTZ-T supports 8mV LSB resolution and ±1% accuracy above 8V, making it suitable for precise USB-C PD voltage steps (5V/9V/15V/20V).
What protection features are implemented in hardware versus firmware on the ISL95338HRTZ-T?
All primary protections - OCP, OVP, UVP (on ADP, VOUTS, and ADPS rails), and OTP - are implemented in hardware with dedicated comparators and latches, ensuring sub-microsecond response independent of SMBus communication. PROCHOT# assertion is hardware-triggered by current-sense amplifier outputs. SMBus registers allow configuration (e.g., thresholds, debounce times) but do not govern basic fault detection - the ISL95338HRTZ-T remains fail-safe even if the host MCU or SMBus bus fails.
Can the ISL95338HRTZ-T operate without SMBus communication enabled?
Yes - the ISL95338HRTZ-T operates fully in standalone mode using default register values and pin-strapped settings. Forward output voltage is set by the PROG pin resistor to GND; soft-start time is determined by the REF pin capacitor; and direction is controlled directly by FRWEN/RVSEN pins. SMBus is optional for dynamic reconfiguration, telemetry readback (e.g., current/voltage monitoring), or advanced sequencing - not required for basic bidirectional regulation functionality.
ISL95338HRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Buck, Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.8V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 4V
- Voltage - Output (Max):
- 20V
- Current - Output:
- -
- Frequency - Switching:
- Up to 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -10°C ~ 100°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFN (4x4)
ISL95338HRTZ-T FAQ
1.How can I place an order for ISL95338HRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95338HRTZ-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 ISL95338HRTZ-T reliable?
The price and inventory of ISL95338HRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95338HRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL95338HRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95338HRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95338HRTZ-T?
ISL95338HRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95338HRTZ-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 ISL95338HRTZ-T?
For technical support, including ISL95338HRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95338HRTZ-T requirements.
6.How does Aetrix verify that ISL95338HRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95338HRTZ-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 ISL95338HRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL95338HRTZ-T?
All ISL95338HRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95338HRTZ-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 ISL95338HRTZ-T part is unused and in its original packaging.
Return procedure for ISL95338HRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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