My Inquiry
My Account
Renesas ISL8112IRZ-T
- Part No.:
- ISL8112IRZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL8112IRZ-T.pdf
- Description:
- IC REG DL BCK/LNR SYNC ADJ 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,330
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL8112IRZ-T from Renesas Electronics (formerly Intersil) is a dual-output synchronous buck controller with integrated 2A gate drivers, designed for high-efficiency main power supplies in battery-powered systems. It delivers two independently configurable SMPS outputs (SMPS1: 0.7–5.5V; SMPS2: 0–2.5V/5V), a programmable LDO (3.3V/5V or 0.7–4.5V), ±1.5% output voltage accuracy, and constant on-time control with 100ns load-step response - enabling use in DDR1/2/3 memory power and portable telecom POL applications.
For engineers reviewing the ISL8112IRZ-T datasheet, ISL8112IRZ-T pinout, ISL8112IRZ-T application, or ISL8112IRZ-T equivalent, key selection criteria include its ultrasonic skip mode (>25kHz at light load), selectable PWM/skip/ultrasonic operation modes, independent enable and PGOOD signals per channel, thermal shutdown, and 32-pin 5×5 QFN package with exposed thermal pad.
Technical Context
The ISL8112IRZ-T implements a constant on-time PWM architecture with input voltage feed-forward, eliminating sense resistors while maintaining stable switching frequency across line/load variations. Its dual controllers operate with independent mode selection (PWM, pulse-skipping, or ultrasonic skip), digital soft-start (1.7ms), and internal soft-stop discharge to prevent negative voltages during shutdown.
It integrates a 100mA/200mA switch-over LDO with automatic bootstrap from BYP, dual precision references (2.0V ±1.0%, 3.3V ±2.0%), temperature-compensated rDS(ON) current sensing, and programmable current limit with foldback - all coordinated via dedicated EN1/EN2, MODE, FS, and ILIM1/ILIM2 pins for system-level sequencing and fault management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 25V - supports wide-input industrial and multi-cell Li+ battery systems without external pre-regulation. |
| SMPS1 Output Range | 0.7V to 5.5V - covers DDR termination, core logic, and I/O rails with ±1.5% accuracy over temperature. |
| SMPS2 Output Range | 0V to 2.5V (direct sensing) or up to 5V (resistor divider) - enables tracking, low-voltage peripherals, and dynamic voltage scaling. |
| LDO Output Options | Fixed 3.3V/5V or adjustable 0.7–4.5V (2×LDOREF) - provides auxiliary bias for analog circuits or reference generation. |
| Switching Frequency | Selectable 200/300kHz, 400/300kHz, or 400/500kHz - balances EMI, efficiency, and component size per rail. |
| Quiescent Power | 5mW - minimizes standby loss in always-on battery systems like PDAs and mobile comms devices. |
| Load-Step Response | 100ns - ensures tight regulation during CPU/GPU transient loads without external compensation. |
Pinout & Package
ISL8112IRZ-T is housed in a thermally enhanced 32-lead 5mm × 5mm QFN package (PKG DWG L32.5x5B) with exposed PGND pad for efficient heat dissipation. Pin functions are validated per FN6396 Rev 1.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies PWM core and linear regulator; bypassed with 1µF ceramic capacitor for stability. |
| UG1/UG2 | High-side gate drivers | Drive n-channel MOSFETs with 2A sink/source capability; require external BOOT capacitors. |
| LG1/LG2 | Low-side synchronous rectifier drivers | Provide 1.7A source / 3.3A sink into PVCC; support efficient synchronous rectification. |
| PH1/PH2 | Power switch node connections | Serve as current-sense inputs and low-side supply rails for UG drivers; connect to inductor center taps. |
| FB1/VSEN2 | Feedback and voltage-sense inputs | Enable fixed (1.05V/1.5V/3.3V/5V) or adjustable output configurations with ±1.5% regulation accuracy. |
| PGOOD1/PGOOD2 | Open-drain power-good indicators | Signal valid regulation with 1% hysteresis; used for system sequencing and fault detection. |
| EN1/EN2/EN_LDO | Independent enable inputs | Allow staggered startup, fault clearing (<0.8V), and LDO activation synchronized to SMPS readiness. |
| MODE/FS | Operating mode and frequency select | Configure PWM, skip, or ultrasonic skip mode and set SMPS1/SMPS2 frequencies independently. |
Key Features
| Feature | Design Value |
|---|---|
| Constant on-time control | Eliminates current-sense resistors and enables 100ns transient response without loop compensation. |
| Ultrasonic skip mode | Maintains switching >25kHz under light load to avoid audible noise in portable audio-sensitive designs. |
| Dual independent PGOOD outputs | Enable precise power sequencing and fault isolation between SMPS1 and SMPS2 rails. |
| Programmable current limit with foldback | Adjustable threshold (40–215mV) protects MOSFETs and inductors during overload or short-circuit events. |
| Automatic LDO bootstrap | Switches LDO output to BYP pin when voltage thresholds are met, reducing quiescent loss and improving efficiency. |
| Digital soft-start & soft-stop | 1.7ms ramp-up prevents inrush current; internal discharge avoids negative voltage on shutdown. |
Applications
| DDR Memory Power Supply | Mobile Baseband Processor Core |
|---|---|
Use Scenario: Providing tightly regulated 1.5V/1.05V rails for DDR1/DDR2/DDR3 SDRAM modules in notebooks and telecom equipment. IC Role / Device Role / Timing Role: Dual-buck controller delivering independent, sequenced, and monitored VDDQ and VTT rails with fast transient response. Use Value: ±1.5% output accuracy and 100ns load-step response ensure signal integrity and timing margin compliance across temperature and load. |
Use Scenario: Generating core and I/O voltages for 3G/4G baseband processors in battery-powered mobile communication devices. IC Role / Device Role / Timing Role: Main power controller supplying scalable SMPS outputs (e.g., 1.2V core, 2.5V I/O) with ultrasonic skip mode to suppress audible noise. Use Value: 5mW quiescent power and high light-load efficiency extend battery life in standby and burst-traffic operating modes. |
| Telecom Point-of-Load (POL) | Li+-Battery-Powered PDA System |
Use Scenario: Delivering multiple isolated DC rails (e.g., 3.3V, 1.5V, 1.05V) from a 5.5–25V intermediate bus in telecom/datacom line cards. IC Role / Device Role / Timing Role: Dual-output buck controller with independent enable and PGOOD for modular, fault-tolerant POL architecture. Use Value: Selectable 200/300/400/500kHz frequencies reduce EMI in dense PCB layouts while maintaining design flexibility. |
Use Scenario: Powering processor, display, and peripheral subsystems in compact PDAs using 3- or 4-cell Li+ batteries (12.6V max). IC Role / Device Role / Timing Role: Integrated main power controller with LDO, references, and sequencing logic replacing discrete regulators and supervisors. Use Value: Extremely low component count and 32-pin QFN footprint minimize board area and BOM cost in space-constrained handhelds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8765GQ-Z | Single-channel controller with integrated MOSFETs; no LDO or dual independent PGOOD outputs. | Requires external LDO and sequencing logic for dual-rail systems; lacks ultrasonic skip mode. | Choose MP8765GQ-Z only when single-rail simplicity and lower cost outweigh need for dual independent control and noise-sensitive operation. |
| TPS54620RGYR | Dual-channel controller with integrated FETs; fixed 3.3V/1.2V outputs only; no adjustable LDO or BYP bootstrap. | Not suitable for variable-output DDR or dynamically scaled core rails; limited to fixed-voltage POL. | Use TPS54620RGYR where fixed dual outputs and TI ecosystem support are prioritized over flexibility and light-load acoustic performance. |
Compared with MP8765GQ-Z and TPS54620RGYR, the ISL8112IRZ-T uniquely combines dual independent buck controllers, an adjustable LDO with automatic bootstrap, ultrasonic skip mode, and full pin-level sequencing - making it optimal for compact, battery-efficient, multi-rail systems requiring acoustic quietness and design scalability.
Availability
ISL8112IRZ-T is available at Aetrix Electronics and suitable for DDR memory power supplies, telecom point-of-load (POL) converters, and Li+-battery-powered portable electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL8112IRZ-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 acquired Intersil in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Intersil power management ICs including the ISL8112IRZ-T.
The ISL8112IRZ-T belongs to Intersil's high-efficiency main power controller family, engineered specifically for battery-powered computing and communications systems demanding ultra-low quiescent power, fast transient response, and flexible multi-rail sequencing.
FAQ
What is the maximum output current capability of the ISL8112IRZ-T's integrated gate drivers?
The ISL8112IRZ-T features two independent gate drivers: UG1/UG2 provide 2A sink/source capability for high-side n-channel MOSFETs, while LG1/LG2 deliver 1.7A source and 3.3A sink for low-side synchronous rectifiers. These ratings are specified at 2V gate drive and enable robust driving of external MOSFETs in high-current buck stages - critical for achieving high efficiency in ISL8112IRZ-T-based 5A–10A power supplies.
How does the ISL8112IRZ-T achieve high light-load efficiency?
The ISL8112IRZ-T achieves high light-load efficiency through three complementary mechanisms: (1) ultrasonic pulse-skipping mode maintains switching above 25kHz to eliminate audible noise while minimizing switching losses; (2) idle-mode pulse skipping reduces gate charge and transition losses at low output currents; and (3) 5mW quiescent power consumption ensures minimal static loss. These features collectively optimize ISL8112IRZ-T performance in battery standby and burst-traffic scenarios.
Can the ISL8112IRZ-T generate both fixed and adjustable outputs simultaneously?
Yes, the ISL8112IRZ-T supports mixed-mode operation: SMPS1 can be configured in adjustable mode (0.7–5.5V via FB1 resistor divider) while SMPS2 operates in fixed mode (e.g., 1.05V or 3.3V via OUT2REF connection to VREF2 or VCC). This flexibility allows designers to assign one rail for dynamic voltage scaling and the other for stable reference or interface power - a capability confirmed in the ISL8112IRZ-T datasheet's "Output Configurations" section.
What is the role of the BYP pin in the ISL8112IRZ-T's LDO operation?
The BYP pin enables automatic LDO bootstrap: when LDOREF is tied to GND (5V mode) and BYP exceeds 4.63V, or when LDOREF is tied to VCC (3.3V mode) and BYP exceeds 3.0V, the internal LDO regulator shuts down and the LDO output connects directly to BYP through a low-RDS(ON) switch (0.7Ω or 1.5Ω). This reduces conduction loss and improves overall efficiency - a key feature distinguishing the ISL8112IRZ-T from standard dual-buck controllers.
Does the ISL8112IRZ-T support power sequencing between its two SMPS outputs?
Yes, the ISL8112IRZ-T supports precise power sequencing via its independent EN1 and EN2 inputs. Connecting EN2 to VREF1 causes SMPS2 to start only after SMPS1 reaches regulation; similarly, connecting EN1 to VREF1 delays SMPS1 startup until SMPS2 is stable. Combined with digital soft-start (1.7ms) and independent PGOOD1/PGOOD2 open-drain outputs, this enables robust, fault-aware sequencing essential for ISL8112IRZ-T implementations in DDR and processor power systems.
ISL8112IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- Adjustable
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- 0.7V ~ 4.5V, 200mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.5V ~ 25V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
ISL8112IRZ-T FAQ
1.How can I place an order for ISL8112IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8112IRZ-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 ISL8112IRZ-T reliable?
The price and inventory of ISL8112IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8112IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL8112IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8112IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8112IRZ-T?
ISL8112IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8112IRZ-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 ISL8112IRZ-T?
For technical support, including ISL8112IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8112IRZ-T requirements.
6.How does Aetrix verify that ISL8112IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL8112IRZ-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 ISL8112IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL8112IRZ-T?
All ISL8112IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL8112IRZ-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 ISL8112IRZ-T part is unused and in its original packaging.
Return procedure for ISL8112IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL8112IRZ-T Tags
-
TPS6521905RHBR
Texas Instruments
-
MIC3385YHL-TR
Microchip Technology
-
A4402ELPTR-T
Allegro MicroSystems
-
LM26480SQ-AA/NOPB
Texas Instruments
-
A4402KLPTR-T
Allegro MicroSystems
-
BD71847AMWV-E2
ROHM Semiconductor
-
ADP5040ACPZ-1-R7
Analog Devices Inc.
-
LT3048IDC#TRPBF
Analog Devices Inc.
-
ADP5037ACPZ-R7
Analog Devices Inc.
-
XRP7714ILB-F
MaxLinear, Inc.
-
LTC3260EDE#TRPBF
Analog Devices Inc.
-
LTC3260EMSE#PBF
Analog Devices Inc.
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
