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Renesas ISL9111EHADJZ-T
- Part No.:
- ISL9111EHADJZ-T
- Manufacturer:
- Renesas
- Package:
- SOT-23-6
- Datasheet:
-
ISL9111EHADJZ-T.pdf
- Description:
- IC REG BOOST ADJ 800MA 6SOT
- Quantity:
- Payment:
- Shipping:
Inventory:4,762
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Product details
Overview
ISL9111EHADJZ-T from Intersil is a low-input-voltage, high-efficiency synchronous boost converter with integrated 1A N-channel and P-channel MOSFETs, designed for single- to triple-cell alkaline/NiCd/NiMH battery-powered systems. It starts up at 0.8V, delivers adjustable output from 2.5V to 5.25V, achieves up to 97% efficiency, and supports skip-mode operation to maintain 20µA quiescent current under light load - enabling extended runtime in portable medical devices and USB-OTG peripherals.
For engineers reviewing the ISL9111EHADJZ-T datasheet, ISL9111EHADJZ-T pinout, ISL9111EHADJZ-T application, or ISL9111EHADJZ-T equivalent, key selection considerations include its 0.8V startup voltage, 1.2MHz fixed-frequency PWM control, internal compensation, FB pin-based output programming, and OVP protection threshold of 5.9V - all critical for ultra-low-voltage battery regulation in space-constrained designs.
Technical Context
The ISL9111EHADJZ-T implements peak current-mode PWM control with internal slope compensation and a 1.2MHz oscillator, enabling stable regulation across wide input/output ratios. Its synchronous rectification architecture replaces external Schottky diodes with low-rDS(ON) integrated MOSFETs (0.2Ω N-ch / 0.35Ω P-ch), minimizing conduction loss and supporting up to 1A peak switch current.
Under light load, it enters skip mode - triggered after eight consecutive zero-current crossings - reducing switching frequency while maintaining output regulation via pulse-skipping with 25% current limit scaling. Fault protection includes overvoltage (5.9V OVP, hysteresis 400mV), thermal shutdown (150°C), and short-circuit detection, with automatic recovery after fault removal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Startup Voltage | 0.8V typical - enables operation from deeply discharged single-cell batteries before UVLO activation. |
| Output Voltage Range | 2.5V to 5.25V - programmable via external resistor divider on FB pin for flexible system rail generation. |
| Switching Frequency | 1.2MHz nominal - allows use of compact 4.7µH inductors and ceramic capacitors, minimizing PCB footprint. |
| Quiescent Current | 20µA typical - extends battery life in standby or low-duty-cycle applications like wireless sensors. |
| Feedback Reference | 800mV typical - sets output accuracy and enables precise resistor ratio selection for target VOUT. |
| OVP Threshold | 5.9V typical - protects downstream circuitry from transient overvoltage during load dump or start-up overshoot. |
| Peak Switch Current | 1.0A typical - defines maximum deliverable output current under boost conditions with sufficient headroom. |
Pinout & Package
ISL9111EHADJZ-T is housed in a Pb-free 6-lead SOT-23 package (JEDEC MO-178AB, pkg drawing P6.064), optimized for high-density portable layouts with thermal resistance θJA = 146°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Connects to inductor's high-side terminal; carries high di/dt current and requires minimized trace inductance. |
| 2 GND | Power ground | Primary return path for power and control circuits; must be tied to solid ground plane for EMI suppression. |
| 3 EN | Enable input | Active-high logic control (0.8×VIN high, 0.2×VIN low); disables IC and disconnects output when low. |
| 4 FB | Feedback input | Senses divided output voltage; sets regulated VOUT = 0.8V × (1 + R1/R2) with <100nA input bias current. |
| 5 VOUT | Regulated output | Delivers boosted DC voltage; requires local 4.7µF ceramic capacitor for stability and ripple reduction. |
| 6 VIN | Input supply | Accepts 0.8V–(VOUT−200mV); requires 4.7µF ceramic capacitor placed adjacent to pin and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Compensation | Eliminates external compensation components, reducing BOM count and design iteration time. |
| Output Disconnect in Shutdown | Prevents battery drain by fully isolating VIN from VOUT when EN = low, critical for long-term storage. |
| Synchronous Rectification | Replaces lossy Schottky diode with integrated P-channel MOSFET, improving efficiency >90% at light-to-moderate loads. |
| Digital Soft-Start | Linear ramp-up limits inrush current during startup, preventing input voltage sag and protecting source battery. |
| Thermal Shutdown with Hysteresis | Shuts down at 150°C and restarts at ~125°C, preventing thermal runaway without oscillatory cycling. |
Applications
| Portable HDMI Transmitters | Wireless Medical Sensors |
|---|---|
Use Scenario: Powering HDMI level-shifters and TMDS drivers from single AA/AAA cells in compact dongles. IC Role / Device Role / Timing Role: Boost converter generating stable 3.3V or 5.0V rail from 0.9–1.5V input, synchronized to video clock domain. Use Value: 0.8V startup ensures operation even as battery discharges below 1.0V, extending usable battery life by >25% versus higher-VSTART alternatives. | Use Scenario: Supplying BLE radio and analog front-end in disposable glucose monitors powered by coin cells. IC Role / Device Role / Timing Role: Adjustable-output boost regulator delivering 2.8V–3.6V to RF transceiver and ADC, with minimal quiescent draw. Use Value: 20µA quiescent current and skip-mode operation enable multi-month shelf life with sub-10µA average system current. |
| USB-OTG Host Adapters | Bluetooth Audio Accessories |
Use Scenario: Providing 5.0V VBUS to USB peripherals from dual NiMH cells in portable OTG hubs. IC Role / Device Role / Timing Role: High-efficiency synchronous boost supplying regulated 5.0V with OVP protection against cable-induced transients. Use Value: 5.9V OVP threshold prevents damage to connected USB devices during hot-plug events or line surges. | Use Scenario: Powering Class-D amplifier and Bluetooth SoC in compact earbuds using single alkaline cell. IC Role / Device Role / Timing Role: Low-noise boost converter delivering 3.3V rail with fast load-transient response to audio burst demands. Use Value: 1.2MHz switching frequency minimizes audible noise and enables small LC filter size, reducing total solution volume by >40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | 0.3V startup, 0.9V min operating voltage; no OVP; 600mA max output; 1.2MHz switching. | Lacks OVP and output disconnect; lower current capability limits use in 5V USB-OTG. | Preferred where ultra-low startup voltage is critical and OVP is handled externally. |
| MAX1703EUT+T | 0.7V startup, 1.5A switch; no skip mode; 500kHz switching; requires external compensation. | Higher quiescent current (100µA); larger inductor required; no internal OVP or thermal shutdown. | Selected when higher output current is needed and board area permits larger magnetics. |
Compared with TPS61200DRCT and MAX1703EUT+T, the ISL9111EHADJZ-T uniquely combines 0.8V startup, integrated OVP, output disconnect, and 20µA quiescent current - making it optimal for battery-sensitive, safety-critical portable applications where reliability and runtime are prioritized over raw current delivery.
Availability
ISL9111EHADJZ-T is available at Aetrix Electronics and suitable for portable medical devices, USB-OTG accessories, Bluetooth audio peripherals, and single-cell battery-powered instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for ISL9111EHADJZ-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 leading provider of precision analog and power management ICs, now part of Renesas Electronics, with deep expertise in battery-powered system solutions.
The ISL9111 product line was designed specifically for ultra-low-voltage, high-efficiency boost conversion in space-constrained portable electronics - emphasizing minimal external components, robust fault protection, and extended battery life.
FAQ
What is the minimum input voltage required for ISL9111EHADJZ-T to start switching?
The ISL9111EHADJZ-T has a typical minimum startup voltage of 0.8V, verified per datasheet FN7602 Rev.4.00 Section "Electrical Specifications". This value applies specifically to the ISL9111 variant (not ISL9111A), and is measured with EN = VIN and RLOAD = 50Ω. Below this threshold, the device remains in UVLO and will not initiate switching - ensuring rechargeable battery protection.
How is the output voltage set on the ISL9111EHADJZ-T?
The ISL9111EHADJZ-T uses an external resistor divider connected between VOUT, FB, and GND to set output voltage. With a typical feedback reference of 800mV, VOUT = 0.8V × (1 + R1/R2). The datasheet specifies R1 and R2 should be placed close to the FB pin to minimize noise pickup, and recommends high-value resistors to reduce divider current and improve overall efficiency.
Does the ISL9111EHADJZ-T provide overvoltage protection, and how does it behave?
Yes, the ISL9111EHADJZ-T includes overvoltage protection (OVP) active only in adjustable-output versions. When VOUT exceeds 5.9V (typical), switching stops and both MOSFETs turn off; stored inductor energy discharges through the P-channel body diode. OVP releases when VOUT drops 400mV below threshold, restoring normal operation without requiring power cycle.
What happens to the output during shutdown when EN is pulled low on the ISL9111EHADJZ-T?
When EN is pulled low, the ISL9111EHADJZ-T enters full shutdown with output disconnect: both N-channel and P-channel MOSFETs turn off, and a special polarity-reversal circuit blocks conduction through the P-channel body diode. This fully isolates VIN from VOUT, preventing battery drain - a key feature confirmed in the "Synchronous Rectifier" section of FN7602 Rev.4.00.
Can the ISL9111EHADJZ-T operate efficiently at very light loads, and what mechanism enables this?
Yes, the ISL9111EHADJZ-T maintains high efficiency at light loads via skip mode: after eight consecutive zero-inductor-current detections, it reduces effective switching frequency while preserving regulation. In this mode, quiescent current drops to 20µA typical, significantly extending battery life in intermittent-use applications such as remote sensors or wearable health monitors.
ISL9111EHADJZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 2.3V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 800mA (Switch)
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-SOT
ISL9111EHADJZ-T FAQ
1.How can I place an order for ISL9111EHADJZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9111EHADJZ-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 ISL9111EHADJZ-T reliable?
The price and inventory of ISL9111EHADJZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9111EHADJZ-T is usually 5 days.
3.What payment methods are accepted for ISL9111EHADJZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9111EHADJZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9111EHADJZ-T?
ISL9111EHADJZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9111EHADJZ-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 ISL9111EHADJZ-T?
For technical support, including ISL9111EHADJZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9111EHADJZ-T requirements.
6.How does Aetrix verify that ISL9111EHADJZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9111EHADJZ-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 ISL9111EHADJZ-T meets industry standards.
7.What is the process for return or replacement of ISL9111EHADJZ-T?
All ISL9111EHADJZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9111EHADJZ-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 ISL9111EHADJZ-T part is unused and in its original packaging.
Return procedure for ISL9111EHADJZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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