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Renesas ISL9111EH33Z-T7A
- Part No.:
- ISL9111EH33Z-T7A
- Manufacturer:
- Renesas
- Package:
- SOT-23-6
- Datasheet:
-
ISL9111EH33Z-T7A.pdf
- Description:
- IC REG BOOST 3.3V 800MA 6SOT
- Quantity:
- Payment:
- Shipping:
Inventory:133
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Product details
Overview
ISL9111EH33Z-T7A from Intersil is a low-input-voltage, high-efficiency synchronous boost converter with integrated 1A N- and P-channel MOSFETs, fixed 3.3V output, and 0.8V typical start-up voltage. It delivers up to 240mA at 3.3V from a 1.8V dual-cell input, operates at 1.2MHz switching frequency, and features output disconnect during shutdown for battery preservation in portable medical and USB-OTG devices.
For engineers reviewing the ISL9111EH33Z-T7A datasheet, ISL9111EH33Z-T7A pinout, ISL9111EH33Z-T7A application, or ISL9111EH33Z-T7A equivalent, key selection criteria include minimum operating voltage (0.7V), quiescent current (20µA), FAULT pin monitoring, UVLO protection, and SOT-23-6 package compatibility with space-constrained battery-powered designs.
Technical Context
The ISL9111EH33Z-T7A implements peak current-mode PWM control with internal slope compensation and a 1.2MHz oscillator, enabling stable regulation across wide input ranges. Its synchronous rectification replaces Schottky diodes with low-rDS(ON) MOSFETs (0.2Ω N-ch / 0.35Ω P-ch), achieving up to 97% efficiency while supporting skip mode below light loads.
UVLO is enabled (shuts down at 0.7V), distinguishing it from the ISL9111A variant. Fault monitoring includes thermal shutdown (150°C), short-circuit detection, and VOUT regulation loss response - all signaled via the open-drain FAULT pin. The fixed 3.3V output eliminates external feedback resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±100mV - ensures stable rail for 3.3V logic without external divider. |
| Start-up Voltage | 0.8V typical - enables operation from deeply discharged single-cell alkaline/NiMH batteries. |
| Min Operating Voltage | 0.7V - prevents over-discharge of rechargeable cells via UVLO. |
| Quiescent Current | 20µA typical - extends battery life in standby or low-duty-cycle applications. |
| Switching Frequency | 1.2MHz ±200kHz - allows use of compact 4.7µH inductors and ceramic capacitors. |
| Peak Switch Current | 1.0A typical - supports up to 240mA output at 3.3V with 1.8V input per datasheet test conditions. |
| Efficiency | Up to 97% - achieved via synchronous rectification and optimized gate drive timing. |
Pinout & Package
ISL9111EH33Z-T7A is housed in a Pb-free 6-lead SOT-23 package (JEDEC MO-178AB, pkg drawing P6.064) with 1.27mm lead pitch and thermal resistance θJA = 146°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Connects to inductor; carries high di/dt current - requires short, wide trace routing. |
| 2 GND | Power ground | Primary return path for input/output currents and IC bias - must connect to solid ground plane. |
| 3 EN | Enable input | Active-high logic control (0.8×VIN high threshold); pulls device into <1µA shutdown when low. |
| 4 FAULT | Fault indicator | Open-drain output pulled low during UVLO, short circuit, OTP, or VOUT regulation loss. |
| 5 VOUT | Regulated output | 3.3V fixed supply rail - decoupled with 4.7µF ceramic capacitor placed adjacent to pin. |
| 6 VIN | Input supply | Accepts 0.8–VOUT−200mV (i.e., ≤3.1V); requires local 4.7µF ceramic bypass to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Output disconnect during shutdown | Prevents battery drain by blocking conduction path between VIN and VOUT when EN = low. |
| Skip mode at light load | Reduces average quiescent current to 20µA while maintaining regulation - critical for intermittent-use devices. |
| Integrated UVLO (0.7V threshold) | Protects rechargeable batteries from deep discharge damage without external components. |
| 1.2MHz fixed-frequency PWM | Enables miniaturized magnetics and low-ESR ceramics - reduces solution footprint vs lower-frequency alternatives. |
| FAULT pin with multi-fault reporting | Single-pin indication for UVLO, short circuit, thermal shutdown, and output regulation failure - simplifies system-level fault diagnostics. |
Applications
| Portable HDMI Transmitters | Wireless Peripherals |
|---|---|
Use Scenario: Powering HDMI level-shifters and TMDS drivers from single-cell alkaline in compact dongles. IC Role / Device Role / Timing Role: Primary 3.3V rail generator with fast transient response and ultra-low quiescent current. Use Value: Enables >100-hour battery life in always-on HDMI adapters while maintaining signal integrity under load steps. | Use Scenario: Supplying 3.3V to Bluetooth radio and MCU in wireless mouse/keyboard. IC Role / Device Role / Timing Role: Main boost regulator delivering regulated power during RF transmit bursts. Use Value: Maintains stable 3.3V under 200mA pulsed loads with <1.5% output ripple - prevents radio dropouts. |
| Personal Medical Devices | MP3/MP4 Players |
Use Scenario: Powering glucose meter display and sensor interface from disposable AA/AAA cells. IC Role / Device Role / Timing Role: Single-stage boost converter with UVLO safeguard for Li-ion or NiMH rechargeables. Use Value: Guarantees safe cutoff at 0.7V to preserve battery cycle life and meet IEC 62304 safety requirements. | Use Scenario: Generating 3.3V for audio DAC, flash memory, and LCD controller in portable media players. IC Role / Device Role / Timing Role: High-efficiency power source supporting variable load profiles (idle, decode, display). Use Value: Achieves 95%+ efficiency at 50mA and 90% at 5mA - directly extends playback time per battery charge. |
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 start-up, no UVLO, 3.3V fixed output, 1.2MHz, 0.9A switch | Optimized for non-rechargeable cells; lacks battery-protection shutdown | Select when lowest possible start-up voltage is required and UVLO is unnecessary. |
| MAX17065ETA+ | 0.7V start-up, 3.3V fixed, 1.1MHz, 1.2A switch, integrated soft-start | Higher peak current and tighter output accuracy (±1.5%), but larger 8-pin µDFN package | Choose for higher output current margin and improved line/load regulation in space-tolerant designs. |
Compared with TPS61200DRCT and MAX17065ETA+, the ISL9111EH33Z-T7A provides superior UVLO protection for rechargeable cells, tighter output voltage accuracy (±100mV vs ±150mV), and smaller SOT-23-6 footprint - making it optimal for compact, battery-sensitive portable electronics.
Availability
ISL9111EH33Z-T7A is available at Aetrix Electronics and suitable for portable HDMI transmitters, wireless peripherals, personal medical devices, and MP3/MP4 players requiring stable component supply with long-term lifecycle support.
Supply support for ISL9111EH33Z-T7A 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 expertise in high-efficiency DC-DC conversion and battery-aware power solutions.
The ISL9111 product line was designed specifically for ultra-low-voltage, single- and multi-cell battery-powered portable electronics - emphasizing minimal start-up voltage, high light-load efficiency, and integrated protection features.
FAQ
What is the minimum input voltage required to start up the ISL9111EH33Z-T7A?
The ISL9111EH33Z-T7A has a typical start-up voltage of 0.8V and guarantees operation down to 0.7V after startup due to its enabled UVLO feature. This allows reliable initialization from nearly depleted single-cell alkaline or NiMH batteries. The device will shut down if VIN drops below 0.7V to prevent over-discharge - a key distinction from the ISL9111A variant. Verified per FN7602 Rev.4.00, page 6.
Does the ISL9111EH33Z-T7A require external feedback resistors to set the output voltage?
No, the ISL9111EH33Z-T7A does not require external feedback resistors because it is a fixed 3.3V output version. The voltage divider is fully integrated internally, eliminating layout sensitivity and component count. This contrasts with the ADJ variants (e.g., ISL9111EHADJZ-T7A), which rely on external R1/R2 networks. Confirmed in the "Fixed Output Voltage" section (page 9) and Pin Descriptions (page 4) of FN7602.
How does the FAULT pin function on the ISL9111EH33Z-T7A?
The FAULT pin on the ISL9111EH33Z-T7A is an open-drain output that pulls low during detected fault conditions including input undervoltage (VIN < 0.7V), output regulation loss (>10% deviation), short circuit (VOUT < VIN), or thermal shutdown (>150°C). It remains asserted until the fault clears or VIN/VOUT collapse. This pin enables system-level fault logging without additional monitoring circuitry - a feature exclusive to fixed-output versions.
What package type and footprint does the ISL9111EH33Z-T7A use?
The ISL9111EH33Z-T7A uses a Pb-free 6-lead SOT-23 package (JEDEC MO-178AB, pkg drawing P6.064) with 1.27mm lead pitch and body dimensions of 2.9mm × 1.6mm × 1.1mm. It is compatible with standard SOT-23 reflow profiles and offers θJA = 146°C/W. This compact footprint supports high-density PCB layouts in space-constrained portable devices.
Can the ISL9111EH33Z-T7A be used with non-rechargeable batteries?
Yes, the ISL9111EH33Z-T7A can be used with non-rechargeable batteries such as alkaline or zinc-carbon cells, though its enabled UVLO (0.7V shutdown) is primarily intended to protect rechargeables. For maximum usable capacity from primary cells, the ISL9111AEH33Z-T7A variant - which disables UVLO and lowers minimum operating voltage to 0.5V - is recommended instead.
ISL9111EH33Z-T7A 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 3.1V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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
ISL9111EH33Z-T7A FAQ
1.How can I place an order for ISL9111EH33Z-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9111EH33Z-T7A 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 ISL9111EH33Z-T7A reliable?
The price and inventory of ISL9111EH33Z-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9111EH33Z-T7A is usually 5 days.
3.What payment methods are accepted for ISL9111EH33Z-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9111EH33Z-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9111EH33Z-T7A?
ISL9111EH33Z-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9111EH33Z-T7A 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 ISL9111EH33Z-T7A?
For technical support, including ISL9111EH33Z-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9111EH33Z-T7A requirements.
6.How does Aetrix verify that ISL9111EH33Z-T7A is sourced from the original manufacturer or authorized distributors?
All ISL9111EH33Z-T7A 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 ISL9111EH33Z-T7A meets industry standards.
7.What is the process for return or replacement of ISL9111EH33Z-T7A?
All ISL9111EH33Z-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL9111EH33Z-T7A, 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 ISL9111EH33Z-T7A part is unused and in its original packaging.
Return procedure for ISL9111EH33Z-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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