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Renesas ISL9107IRZ-T
- Part No.:
- ISL9107IRZ-T
- Manufacturer:
- Renesas
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
ISL9107IRZ-T.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,282
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Product details
Overview
ISL9107IRZ-T from Intersil is a 1.5A, 1.6MHz synchronous buck regulator with integrated P- and N-channel MOSFETs, 0.8V feedback reference, Power-Good (PG) output with 215ms delay, and selectable forced PWM or skip mode. It operates from 2.7V–5.5V input and delivers regulated output down to 0.8V, targeting core power in space-constrained portable devices like PDAs and cellular phones.
For engineers reviewing the ISL9107IRZ-T datasheet, ISL9107IRZ-T pinout, ISL9107IRZ-T application, or ISL9107IRZ-T equivalent, this page provides verified technical context, confirmed pin functions, real-world efficiency curves, PG timing behavior, and validated alternative options for low-voltage DC/DC conversion in battery-powered systems.
Technical Context
The ISL9107IRZ-T uses peak-current-mode PWM control with internal slope compensation and zero-cross sensing for skip-mode entry after eight consecutive inductor current zero crossings. Its 0.8V bandgap reference feeds an error amplifier with 20µA/V transconductance, enabling precise voltage regulation via external resistor divider on FB.
It integrates matched 0.16Ω (P-MOSFET) and 0.15Ω (N-MOSFET) switches optimized for high efficiency at light and heavy loads, supports 100% duty cycle for ultra-low dropout, and includes dedicated RSI input to reset the PG timer - a feature exclusive to ISL9107 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5A guaranteed - supports microprocessor core rails requiring stable mid-range current delivery without external current-sense resistors. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single Li+ cell (2.7–4.2V), three NiMH cells, or regulated 5V supply without external LDO pre-regulation. |
| Quiescent Current | 17µA typical in skip mode - extends battery runtime in standby or low-power states of handheld devices. |
| Switching Frequency | 1.35–1.75MHz - enables use of compact 2.2µH inductors and 10µF ceramic capacitors, minimizing total solution footprint to <1cm². |
| Feedback Reference | 0.78–0.82V over –40°C to +85°C - ensures ±1.5% output accuracy across temperature with standard 1% resistors. |
| Power-Good Delay | 150–275ms typical - provides reliable system-level power sequencing confirmation before enabling downstream logic. |
| Thermal Shutdown | 150°C activation with 25°C hysteresis - protects against sustained overload or poor PCB thermal design while allowing automatic recovery. |
Pinout & Package
ISL9107IRZ-T is housed in an 8-lead 2mm × 3mm DFN package with exposed thermal pad (L8.2x3). The package height is 0.9mm typical, and the exposed pad must be soldered to ground for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Input supply rail | Accepts 2.7–5.5V; requires local 10µF ceramic decoupling to GND to suppress switching noise and stabilize input impedance. |
| 2 EN | Enable control | Active-high logic input; pulls output capacitor to GND when low, enabling clean power-down sequencing in multi-rail systems. |
| 3 PG | Power-Good open-drain output | Asserts low after 215ms delay when output reaches 89.5–94.5% of nominal; resets on rising edge of RSI signal. |
| 4 MODE | Operation mode select | High = skip mode (light-load efficiency); low = forced PWM (constant frequency, lower noise, better transient response). |
| 6 FB | Voltage feedback input | Senses output via resistor divider; 0.8V reference sets VOUT = 0.8V × (1 + R2/R3); leakage ≤0.1µA minimizes setting error. |
| 7 GND | System ground reference | Primary return path for power and control circuits; must be connected directly to exposed thermal pad for thermal and EMI integrity. |
| 8 SW | Switching node | Connects to inductor; carries high di/dt pulses; requires short, wide trace routing away from sensitive analog nodes like FB. |
| E-PAD | Thermal and electrical ground | Exposed copper pad on underside; must be soldered to large GND plane for thermal dissipation (θJC = 11°C/W) and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous FETs | P-MOSFET RDS(on) = 0.16Ω / N-MOSFET RDS(on) = 0.15Ω at 2.7V - eliminates external switch losses and reduces BOM count by two components. |
| Dual-mode operation | Selectable skip mode (17µA IQ) or forced PWM (1.6MHz fixed) - balances battery life vs. EMI/noise requirements per system state. |
| Internal digital soft-start | 1.1ms typical ramp time - prevents inrush current into output capacitance, avoiding input rail sag and downstream reset events. |
| Output discharge on shutdown | Active internal discharge path from VOUT to GND - ensures rapid, controlled output collapse for safe power sequencing in multi-supply systems. |
| 100% duty-cycle capability | Enables dropout voltage = ILOAD × 0.16Ω - sustains regulation down to VIN ≈ VOUT + (ILOAD × 0.16Ω), maximizing usable battery range. |
Applications
| Mobile Baseband Processor Core | DSP Voltage Rail |
|---|---|
Use Scenario: Powers ARM9/ARM11 baseband processor cores in 3G/4G smartphones requiring dynamically scaled 1.0–1.2V supplies with fast load-transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering up to 1.5A with 215ms PG assertion for boot sequence validation. Use Value: Skip mode extends talk-time by reducing no-load IQ to 17µA; forced PWM mode maintains <10mV output deviation during 1A step transients. |
Use Scenario: Supplies fixed 1.6V rail to audio/video DSPs in portable media players where consistent low-noise operation is critical. IC Role / Device Role / Timing Role: Regulator with selectable PWM mode to suppress switching noise near analog audio paths while maintaining efficiency. Use Value: 1.6MHz fixed-frequency operation avoids audible beat frequencies; integrated soft-start prevents DAC initialization glitches during power-up. |
| Li-ion Powered PDA System | Low-Power Wireless MCU Subsystem |
Use Scenario: Generates 0.8V–3.3V configurable output for PDA main logic board powered by single-cell Li-ion battery (2.7–4.2V). IC Role / Device Role / Timing Role: Compact DC/DC converter occupying <1cm² PCB area; PG signal synchronizes FPGA configuration after stable VCC. Use Value: 2mm × 3mm DFN package with thermal pad enables high-density layout; UVLO (2.5V typ.) prevents brownout during battery depletion. |
Use Scenario: Powers Bluetooth LE or Zigbee MCU subsystems in IoT sensors requiring ultra-low quiescent current during sleep cycles. IC Role / Device Role / Timing Role: Buck regulator with 0.05µA shutdown current and RSI-controlled PG reset for wake-event coordination. Use Value: Discharge-on-shutdown clears residual VOUT charge before deep-sleep entry; RSI allows host MCU to re-trigger PG after firmware update. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | No PG output; 1.8MHz fixed frequency; 25µA IQ in PWM mode; 0.6V reference; 2mm × 2mm WSON | Lacks power-good signaling and RSI reset - unsuitable for systems requiring sequenced enable or fault-aware boot. | Choose when board space is tighter (2×2mm), PG is unnecessary, and higher switching frequency is acceptable for smaller LC values. |
| RT8059NGQW | 1.5A rating; 2.5MHz switching; 22µA IQ in PFM; no PG or RSI; 3mm × 3mm QFN | Higher fSW increases EMI risk near RF sections; no PG function removes hardware-based power validation. | Prefer when faster transient response is prioritized over battery life, and system-level software handles power sequencing instead of hardware PG. |
Compared with TPS62231DRYR and RT8059NGQW, the ISL9107IRZ-T uniquely combines PG timing, RSI reset, and sub-20µA skip-mode IQ in a 2×3mm DFN - making it the only option among the three that supports hardware-validated boot sequences in battery-critical portable designs.
Availability
ISL9107IRZ-T is available at Aetrix Electronics and suitable for mobile baseband power, DSP voltage rails, Li-ion-powered PDA systems, and low-power wireless MCU subsystems requiring stable component supply with full lifecycle support.
Supply support for ISL9107IRZ-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 (now part of Renesas Electronics) designs high-performance analog and power management ICs for demanding portable, industrial, and communications applications.
The ISL9107IRZ-T belongs to Intersil's low-quiescent-current synchronous buck regulator family, engineered specifically for extended battery life and minimal PCB area in handheld consumer electronics.
FAQ
What is the purpose of the RSI pin on the ISL9107IRZ-T?
The RSI (Reset Signal Input) pin on the ISL9107IRZ-T resets the internal 215ms Power-Good timer. When RSI is driven high, the PG output remains low regardless of output voltage status; upon RSI falling edge, the 215ms delay restarts. This function is exclusive to ISL9107 variants and is not present on ISL9108. The ISL9107IRZ-T uses RSI to enable flexible power sequencing in multi-stage systems where external logic must revalidate rail stability after events like firmware updates or fault recovery.
Does the ISL9107IRZ-T support adjustable output voltage, and how is it set?
Yes, the ISL9107IRZ-T supports adjustable output voltage from 0.8V upward using an external resistor divider on the FB pin. With a precise 0.8V internal reference, VOUT = 0.8V × (1 + R2/R3). Recommended R3 ≤200kΩ limits error from FB leakage current (≤0.1µA). For example, 1.2V output uses R2 = 80.6kΩ and R3 = 162kΩ per Table 1 in the FN6612 datasheet. The ISL9107IRZ-T does not support dynamic voltage scaling - the divider is fixed per application.
How does the ISL9107IRZ-T behave during input undervoltage conditions?
The ISL9107IRZ-T features undervoltage lockout (UVLO) with a rising threshold of 2.5V typical and falling threshold of 2.4V typical. When VIN drops below the falling threshold, the device disables switching, turns off both MOSFETs, and discharges the output capacitor via its internal path. Once VIN rises above 2.5V, the ISL9107IRZ-T initiates soft-start. This behavior prevents erratic operation near battery depletion and ensures clean restart - critical for ISL9107IRZ-T deployments in single-cell Li-ion systems.
Can the ISL9107IRZ-T operate with 100% duty cycle, and what is its practical benefit?
Yes, the ISL9107IRZ-T supports 100% duty cycle operation, meaning the P-channel MOSFET remains fully on when VIN approaches VOUT. Dropout voltage equals ILOAD × RDS(on) (0.16Ω typ.), so at 1A load, dropout is ~160mV. This extends usable battery life by maintaining regulation down to VIN = VOUT + 0.16V - crucial for ISL9107IRZ-T applications in devices powered by aging Li-ion cells where voltage sags below 3.0V under load.
What thermal performance can be expected from the ISL9107IRZ-T in a standard 2-layer PCB layout?
In a standard 2-layer PCB with the ISL9107IRZ-T's exposed thermal pad soldered to a 250mm² GND copper pour, θJA is approximately 78°C/W. At 1.5A load and 3.6V input, power dissipation is ~0.36W, resulting in ~28°C junction-to-ambient rise above ambient. The ISL9107IRZ-T's thermal shutdown activates at 150°C with 25°C hysteresis, providing robust protection. Performance improves significantly with 4-layer boards and internal GND planes - a key design consideration for ISL9107IRZ-T in thermally constrained enclosures.
ISL9107IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
ISL9107IRZ-T FAQ
1.How can I place an order for ISL9107IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9107IRZ-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 ISL9107IRZ-T reliable?
The price and inventory of ISL9107IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9107IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL9107IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9107IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9107IRZ-T?
ISL9107IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9107IRZ-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 ISL9107IRZ-T?
For technical support, including ISL9107IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9107IRZ-T requirements.
6.How does Aetrix verify that ISL9107IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9107IRZ-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 ISL9107IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL9107IRZ-T?
All ISL9107IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9107IRZ-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 ISL9107IRZ-T part is unused and in its original packaging.
Return procedure for ISL9107IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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