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Renesas ISL8088IRZ
- Part No.:
- ISL8088IRZ
- Manufacturer:
- Renesas
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
ISL8088IRZ.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:675
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Product details
Overview
ISL8088IRZ from Renesas (formerly Intersil) is a dual-channel synchronous buck regulator delivering up to 800mA per channel with 2.25MHz fixed switching frequency, 0.6V reference voltage, and 2.75V–5.5V input range. It supports forced PWM and PFM modes, features integrated power-good monitoring with 1ms delay, and targets space-constrained battery-powered systems requiring high light-load efficiency.
For engineers reviewing the ISL8088IRZ datasheet, ISL8088IRZ pinout, ISL8088IRZ application, or ISL8088IRZ equivalent, key selection considerations include dual-channel independent enable control (EN1/EN2), SYNC-pin configurable operation mode (PFM/PWM/synchronization up to 4MHz), soft-start discharge during shutdown, and thermal shutdown at 150°C with 25°C hysteresis.
Technical Context
The ISL8088IRZ employs current-mode PWM control with internal slope compensation for fast transient response and loop stability. Its dual in-phase channels share a single oscillator but operate independently with separate feedback (FB1/FB2), enable (EN1/EN2), and switching nodes (LX1/LX2).
It integrates P- and N-channel MOSFETs with typical 180mΩ on-resistance each, supports 100% duty cycle for ultra-low dropout, and uses zero-cross detection for PFM entry. The 1ms PG output monitors both channels simultaneously and includes internal 1MΩ pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current (per channel) | 800mA continuous - supports dual-core µP/FPGA core rails without external boost. |
| Switching Frequency | 2.25MHz (typical) - enables use of 2.2µH inductors and 10µF ceramic output capacitors, minimizing PCB area. |
| Input Voltage Range | 2.75V to 5.5V - compatible with single Li+ cell (fully discharged), three NiMH cells, or regulated 5V supply. |
| Quiescent Current (PFM) | 30µA total (both channels) - extends battery life in always-on low-power states. |
| Feedback Reference Voltage | 0.6V ±10mV - sets minimum output voltage; allows programmable outputs down to 0.6V via resistor divider. |
| Power-Good Delay | 1ms rising-edge delay - provides reliable system reset timing after both outputs stabilize. |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - prevents permanent damage while enabling automatic recovery at 130°C. |
Pinout & Package
ISL8088IRZ is housed in a thermally enhanced 3mm × 3mm, 10-lead DFN package (L10.3x3C) with exposed pad (PD) requiring connection to PGND for electrical integrity and optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 | Channel 1 feedback input | Negative input to transconductance error amplifier; sets VOUT1 via external resistor divider referenced to 0.6V. |
| EN1 | Channel 1 enable | Active-high logic input; enables VOUT1 and initiates soft-start; pulls output capacitor to GND when low. |
| VIN | Main input supply | Accepts 2.75V–5.5V; requires 10µF ceramic decoupling capacitor to PGND. |
| LX1 | Channel 1 switch node | Connects to inductor terminal; carries high-frequency switching current; must be routed with minimal loop area. |
| NC | No-connect | Recommended to tie to exposed pad (PGND) for mechanical stability and thermal conduction. |
| SYNC | Mode selection & sync input | Logic high → PFM mode; logic low → forced PWM; external clock edge-triggered sync up to 4MHz. |
| LX2 | Channel 2 switch node | Independent high-side switching node for second buck stage; identical routing requirements as LX1. |
| PG | Power-good output | Open-drain output with internal 1MΩ pull-up; asserts high after 1ms delay when both VOUT1 and VOUT2 are within regulation. |
| EN2 | Channel 2 enable | Independent active-high control for VOUT2; enables/disables second channel without affecting Channel 1. |
| FB2 | Channel 2 feedback input | Identical function to FB1; sets VOUT2 independently using separate resistor divider network. |
Key Features
| Feature | Design Value |
|---|---|
| Selectable PFM/PWM operation | Reduces quiescent current to 30µA at light load (PFM) while maintaining low-noise 2.25MHz operation under full load (PWM). |
| Internal digital soft-start (2ms) | Prevents inrush current and output overshoot during startup; supports pre-biased output conditions. |
| Soft-stop output discharge | Activates 100Ω internal discharge switch upon EN deassertion, safely draining output capacitors to GND. |
| 100% duty-cycle capability | Extends battery runtime by maintaining regulation down to VIN ≈ VOUT + (IOUT × 180mΩ), e.g., ~2.7V input for 2.5V@800mA. |
| Independent dual-channel control | EN1/EN2 and FB1/FB2 allow asymmetric rail sequencing, independent voltage programming, and fault isolation between channels. |
Applications
| DC/DC POL Modules | µC/µP and FPGA Core Power |
|---|---|
|
Use Scenario: Compact point-of-load converters on dense CPU/FPGA carrier boards where board space and thermal density are constrained. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing independent, tightly regulated 2.5V and 1.8V core supplies with fast transient response. Use Value: 2.25MHz operation enables <1.8cm² total solution size; PFM mode maintains >85% efficiency at 10mA load, extending runtime in idle states. |
Use Scenario: Powering multi-rail embedded microcontrollers with separate I/O, core, and analog supplies. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter generating sequenced core (1.2V–1.8V) and I/O (2.5V–3.3V) voltages using EN1/EN2 control. Use Value: Independent enable pins support precise power-up sequencing; 1ms PG output validates both rails before releasing processor reset. |
| Li-ion Battery-Powered Devices | Bar Code Readers & Portable Scanners |
|
Use Scenario: Handheld medical monitors or portable test equipment powered by single-cell Li-ion batteries (2.7–4.2V). IC Role / Device Role / Timing Role: Primary power management IC delivering stable 1.8V and 2.5V rails across full battery discharge curve. Use Value: 100% duty cycle extends usable battery range down to 2.75V input; 30µA quiescent current minimizes standby drain. |
Use Scenario: Low-cost, high-reliability portable scanners requiring robust power delivery in variable ambient temperatures. IC Role / Device Role / Timing Role: Dual-output regulator powering laser diode driver (2.5V) and CMOS image sensor (1.8V) with independent fault handling. Use Value: Thermal shutdown (150°C) and overcurrent protection (1.2A peak) prevent field failures; DFN package withstands mechanical shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62097RGTR | Single 2A output; no dual independent channels; 2.25MHz fixed frequency; 0.6V ref; 2.5–6V input. | Requires two devices for dual-rail designs; lacks independent EN/PG per channel; no PFM mode. | Choose only if higher per-rail current (>800mA) is needed and dual-channel independence is not required. |
| RTQ2132BGQW | Dual 3A/channel; 500kHz–2.2MHz adjustable frequency; 0.6V ref; 2.7–17V input; no PFM mode; larger 4mm×4mm QFN. | Higher voltage input range and current capability; unsuitable for ultra-low-IQ battery apps due to 35µA typical IQ. | Select when input exceeds 5.5V or output current >800mA per rail is mandatory; avoid for Li+-only portable designs. |
Compared with TPS62097RGTR and RTQ2132BGQW, the ISL8088IRZ uniquely balances dual-channel independence, 30µA PFM quiescent current, and 2.25MHz small-footprint operation-making it optimal for space- and battery-life–constrained dual-rail applications below 5.5V input.
Availability
ISL8088IRZ is available at Aetrix Electronics and suitable for DC/DC POL modules, µC/µP and FPGA core power, and Li-ion battery-powered devices requiring stable component supply, RoHS-compliant packaging, and long-term industrial temperature support (–40°C to +85°C).
Supply support for ISL8088IRZ 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 its high-performance analog and power management portfolio. Renesas is a global semiconductor leader focused on embedded solutions for automotive, industrial, and IoT markets.
The ISL8088IRZ belongs to Renesas' high-efficiency synchronous buck regulator product line, designed specifically for compact, battery-sensitive applications demanding dual independent rails, ultra-low quiescent current, and minimal external component count.
FAQ
What is the maximum supported input voltage for the ISL8088IRZ?
The ISL8088IRZ has an absolute maximum input voltage rating of 6.5V (DC) and 7V for ≤20ms transients. Its recommended operating range is 2.75V to 5.5V. Exceeding 5.5V continuously risks violating safe operating area limits and may trigger undervoltage lockout or thermal shutdown. Always maintain input within spec to ensure reliability and longevity of the ISL8088IRZ.
Does the ISL8088IRZ support pre-biased output startup?
Yes, the ISL8088IRZ supports pre-biased output startup in forced PWM mode. During initial power-up, the IC begins soft-start even if the output voltage is already present, preventing reverse current flow and ensuring controlled ramp-up. This behavior is confirmed in the datasheet's "Soft-Start-Up" section and verified in Figure 24–29 waveforms for both PWM and PFM modes of the ISL8088IRZ.
How does the Power-Good (PG) pin monitor dual outputs on the ISL8088IRZ?
The PG pin on the ISL8088IRZ is a single open-drain output that monitors both VOUT1 and VOUT2 simultaneously. It remains low until both outputs reach ≥92% of their nominal voltage and sustains high for ≥1ms. If either channel is disabled (ENx = low), PG monitors only the active channel(s). An internal 1MΩ pull-up ensures defined logic-high state when asserted, making the ISL8088IRZ suitable for system reset coordination.
What is the purpose of the NC pin on the ISL8088IRZ DFN package?
The NC pin (Pin 5) on the ISL8088IRZ is not internally connected but is recommended to be tied to the exposed pad (PGND) for mechanical reinforcement and improved thermal conduction from the die to the PCB. This connection enhances thermal performance and solder joint reliability without affecting electrical functionality - a design best practice explicitly stated in the ISL8088IRZ datasheet Pin Descriptions table.
Can the ISL8088IRZ synchronize to an external clock, and what is the valid frequency range?
Yes, the ISL8088IRZ can synchronize to an external clock applied to the SYNC pin, triggered on the falling edge. The supported synchronization range is 2.7MHz to 4MHz, as specified in the Electrical Specifications table. Operation outside this range may result in unstable switching or loss of synchronization. For reliable multi-regulator phase alignment, drive SYNC with a clean CMOS signal referenced to the same ground as the ISL8088IRZ.
ISL8088IRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.75V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 800mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
ISL8088IRZ FAQ
1.How can I place an order for ISL8088IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8088IRZ 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 ISL8088IRZ reliable?
The price and inventory of ISL8088IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8088IRZ is usually 5 days.
3.What payment methods are accepted for ISL8088IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8088IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8088IRZ?
ISL8088IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8088IRZ 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 ISL8088IRZ?
For technical support, including ISL8088IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8088IRZ requirements.
6.How does Aetrix verify that ISL8088IRZ is sourced from the original manufacturer or authorized distributors?
All ISL8088IRZ 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 ISL8088IRZ meets industry standards.
7.What is the process for return or replacement of ISL8088IRZ?
All ISL8088IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL8088IRZ, 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 ISL8088IRZ part is unused and in its original packaging.
Return procedure for ISL8088IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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