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Renesas ISL9111EHADJZ-T7A
- Part No.:
- ISL9111EHADJZ-T7A
- Manufacturer:
- Renesas
- Package:
- SOT-23-6
- Datasheet:
-
ISL9111EHADJZ-T7A.pdf
- Description:
- IC REG BOOST ADJ 800MA 6SOT
- Quantity:
- Payment:
- Shipping:
Inventory:662
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Product details
Overview
ISL9111EHADJZ-T7A from Intersil is a low-input-voltage, high-efficiency synchronous boost converter with integrated 1A N-channel and P-channel MOSFETs, optimized for single- to triple-cell alkaline/NiMH/NiCd battery-powered systems. It starts up at 0.8V (typ), delivers adjustable output from 2.5V to 5.25V, achieves up to 97% efficiency, and operates at 1.2MHz switching frequency to enable compact 4.7µH inductor + ceramic capacitor designs.
For engineers reviewing the ISL9111EHADJZ-T7A datasheet, ISL9111EHADJZ-T7A pinout, ISL9111EHADJZ-T7A application, or ISL9111EHADJZ-T7A equivalent, key selection considerations include its 0.8V startup capability, internal current-mode PWM control with skip mode (20µA quiescent current), UVLO protection (0.7V shutdown), OVP threshold of 5.9V, and 6-lead SOT-23 package compatibility with space-constrained portable devices.
Technical Context
The ISL9111EHADJZ-T7A implements peak current-mode PWM control with internal slope compensation and a 1.2MHz oscillator, enabling stable regulation across wide input/output ratios. Its dual-MOSFET synchronous rectification eliminates external Schottky losses, while integrated soft-start limits inrush current and fault monitoring covers OVP (5.9V), OTP (150°C), short-circuit, and undervoltage lockout.
It operates in two distinct modes: fixed-frequency PWM (1.2MHz) under medium-to-heavy loads and skip mode under light loads-reducing quiescent current to 20µA and improving battery life. The FB pin accepts an external resistor divider to set output voltage, with a precise 0.8V (784–816mV) reference and 100nA input bias current for accurate, low-power feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Startup Voltage | 0.8V typical - enables operation from deeply discharged single-cell batteries before system brownout. |
| Output Voltage Range | 2.5V to 5.25V - programmable via external FB divider to match diverse load requirements (e.g., 3.3V MCU, 5V USB-OTG). |
| Switching Frequency | 1.2MHz (1.0–1.4MHz) - allows use of miniature 4.7µH inductors and low-ESR ceramic capacitors for ultra-compact PCB layouts. |
| Quiescent Current | 20µA typical - minimizes standby power loss, extending battery runtime in always-on or intermittent-use applications. |
| Peak Switch Current | 1.0A typical - supports ≥240mA output at 3.3V from dual-cell input (VIN = 1.8V), sufficient for Bluetooth headsets and medical sensors. |
| OVP Threshold | 5.9V typical - protects downstream 5V-rated ICs from transient overvoltage during load dump or startup overshoot. |
| Feedback Reference | 0.800V (784–816mV) - high-accuracy internal reference ensures ±3% output regulation across temperature and line/load variations. |
Pinout & Package
ISL9111EHADJZ-T7A is housed in a Pb-free, RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178AB, pkg drawing P6.064), with θJA = 146°C/W and operating ambient range of –20°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switching node | Connects to inductor's switch-side terminal; carries high di/dt current and fast voltage transitions - requires short, low-inductance routing. |
| 2 - GND | Power and signal ground | Common return path for input/output capacitors, inductor, and internal circuitry; must be tied to solid ground plane for EMI control. |
| 3 - EN | Enable control input | Active-high logic input (0.8×VIN high, 0.2×VIN low); pulls device into <1µA shutdown state when low, disconnecting VOUT from VIN. |
| 4 - FB | Feedback input | Monitors output via external resistor divider; internal 0.8V reference sets VOUT = 0.8V × (1 + R1/R2); 100nA bias enables high-value resistors for low power loss. |
| 5 - VOUT | Regulated output | Delivers boosted DC voltage; requires local 4.7µF ceramic capacitor to minimize ripple and support transient load response. |
| 6 - VIN | Input supply | Accepts 0.8V–(VOUT − 200mV); requires 4.7µF ceramic capacitor placed adjacent to pin and GND for stable input impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated N- and P-channel MOSFETs replace lossy Schottky diode, enabling >90% efficiency and eliminating external rectifier BOM cost. |
| Output disconnect in shutdown | Internal circuitry reverses P-MOSFET body diode polarity during EN = low, fully isolating battery from load to prevent deep discharge. |
| Current-mode PWM + skip mode | Peak-current control ensures cycle-by-cycle stability; automatic transition to skip mode below ~1mA load reduces IQ to 20µA without compromising regulation. |
| Integrated OVP (ADJ version) | Monitors VOUT continuously; shuts down switching if voltage exceeds 5.9V, then auto-restarts only after VOUT drops 400mV below threshold. |
| UVLO with hysteresis | Shuts down at 0.7V (typ) to protect rechargeable cells from over-discharge; restarts only after VIN rises above ~0.76V due to built-in hysteresis. |
Applications
| Portable HDMI Transmitters | Wireless Medical Sensors |
|---|---|
Use Scenario: Powering HDMI level-shifters and TMDS drivers from a single AA/AAA cell in compact dongles. IC Role / Device Role / Timing Role: Primary boost regulator generating stable 3.3V or 5V rail from 0.9–1.5V input, supporting hot-plug detection and low-latency video startup. Use Value: 0.8V startup and 97% efficiency extend usable battery life by >30% versus legacy charge pumps, while 1.2MHz operation avoids audible noise in audio-video interfaces. |
Use Scenario: Supplying 3.0V to ultra-low-power ECG/SpO₂ analog front-ends and BLE SoCs in disposable wearable patches. IC Role / Device Role / Timing Role: Always-on power manager delivering regulated output during intermittent sensing bursts, with shutdown current <1µA between measurements. Use Value: 20µA quiescent current and output disconnect preserve shelf life of primary lithium cells; OVP prevents sensor damage during accidental 5V connection. |
| USB-OTG Host Devices | Bluetooth Audio Accessories |
Use Scenario: Providing 5.0V VBUS to USB peripherals (keyboards, mice) from dual NiMH cells in portable hubs. IC Role / Device Role / Timing Role: High-current boost stage delivering ≥500mA at 5V with tight line/load regulation (<±1.5%) and fast transient recovery. Use Value: 1.0A peak switch current and 87.5% max duty cycle sustain 5V output even as input decays to 1.8V, ensuring reliable peripheral enumeration. |
Use Scenario: Powering 3.3V DSP, RF transceiver, and MEMS microphone in compact earbuds with single alkaline cell. IC Role / Device Role / Timing Role: Efficiency-optimized voltage source enabling >8-hour playback; enters skip mode during silence to minimize idle drain. Use Value: Skip mode cuts average current draw by 5× versus forced-PWM, directly increasing talk time; thermal shutdown (150°C) prevents overheating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | Lower 0.3V startup, but no OVP; 0.65A switch current; 1.2MHz fixed freq; requires external compensation. | Lacks OVP and UVLO hysteresis - unsuitable for unattended medical or safety-critical battery systems. | Prefer ISL9111EHADJZ-T7A where OVP, precise UVLO, and higher 1A current margin are required. |
| MAX77801EWA+T | Higher 2.7V min input; integrates LDO backup; 1.5MHz switching; I²C programmable output. | Designed for Li-ion systems - incompatible with sub-1V alkaline/NiMH start-up requirements. | ISL9111EHADJZ-T7A remains optimal for low-VIN multi-chemistry battery applications needing minimal external components. |
Compared with TPS61200DRCT and MAX77801EWA+T, the ISL9111EHADJZ-T7A uniquely combines 0.8V startup, integrated OVP, UVLO hysteresis, and 1A switch current in a 6-pin SOT-23 - making it the only drop-in solution for space-constrained, single-cell alkaline/NiMH-powered portable electronics requiring robust fault protection.
Availability
ISL9111EHADJZ-T7A is available at Aetrix Electronics and suitable for portable HDMI transmitters, wireless medical sensors, USB-OTG host devices, and Bluetooth audio accessories requiring stable component supply across long-lifecycle consumer and industrial programs.
Supply support for ISL9111EHADJZ-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 (now part of Renesas Electronics) is a leader in precision analog and power management ICs, serving industrial, infrastructure, and mobile computing markets with high-reliability, energy-efficient solutions.
The ISL9111 product line was designed specifically for ultra-low-input-voltage battery-powered applications - prioritizing startup capability, light-load efficiency, and fault resilience in compact portable electronics.
FAQ
What is the minimum input voltage required to start up the ISL9111EHADJZ-T7A?
The ISL9111EHADJZ-T7A has a typical startup voltage of 0.8V, allowing it to begin operation from a single partially discharged alkaline or NiMH cell. This value is confirmed across the –20°C to +85°C operating range and is critical for maximizing usable battery capacity in portable devices. The ISL9111EHADJZ-T7A will not initiate switching until VIN reaches this threshold, even if EN is asserted high.
How is the output voltage set on the ISL9111EHADJZ-T7A?
The ISL9111EHADJZ-T7A uses an external resistor divider connected between VOUT, FB, and GND to set the output voltage. With a precise 0.800V (784–816mV) internal feedback reference, VOUT = 0.8V × (1 + R1/R2). For example, R1 = 357kΩ and R2 = 166kΩ yields 2.5V. The ISL9111EHADJZ-T7A's 100nA FB input bias enables high-resistance dividers to minimize power loss without sacrificing accuracy.
Does the ISL9111EHADJZ-T7A provide output disconnect during shutdown?
Yes - when EN is pulled low, the ISL9111EHADJZ-T7A actively disables both internal MOSFETs and reverses the polarity of the P-channel body diode, completely isolating VIN from VOUT. This feature prevents battery drain through load leakage paths and is intrinsic to the ISL9111EHADJZ-T7A's architecture, requiring no external FET or controller. Shutdown current is <2µA.
What protection features does the ISL9111EHADJZ-T7A include?
The ISL9111EHADJZ-T7A integrates overvoltage protection (OVP at 5.9V), overtemperature protection (OTP at 150°C with 25°C hysteresis), short-circuit protection, and undervoltage lockout (UVLO at 0.7V). All protections trigger immediate shutdown and auto-restart after fault clearance - except UVLO, which requires cycling EN or VIN. These functions are confirmed in the FN7602 datasheet Tables 1 and 7.
Can the ISL9111EHADJZ-T7A operate from a single NiCd cell?
Yes - the ISL9111EHADJZ-T7A is explicitly qualified for single-, dual-, and triple-cell alkaline, NiCd, and NiMH battery systems. Its 0.8V startup and 0.7V UVLO threshold align with the nominal 1.2V and discharge curve of NiCd cells, enabling full utilization of their capacity while preventing over-discharge damage. The ISL9111EHADJZ-T7A's performance is validated at VIN = 0.9V and 1.8V in the datasheet Figures 7–11.
ISL9111EHADJZ-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:
- 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-T7A FAQ
1.How can I place an order for ISL9111EHADJZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9111EHADJZ-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 ISL9111EHADJZ-T7A reliable?
The price and inventory of ISL9111EHADJZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9111EHADJZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL9111EHADJZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9111EHADJZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9111EHADJZ-T7A?
ISL9111EHADJZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9111EHADJZ-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 ISL9111EHADJZ-T7A?
For technical support, including ISL9111EHADJZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9111EHADJZ-T7A requirements.
6.How does Aetrix verify that ISL9111EHADJZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL9111EHADJZ-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 ISL9111EHADJZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL9111EHADJZ-T7A?
All ISL9111EHADJZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL9111EHADJZ-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 ISL9111EHADJZ-T7A part is unused and in its original packaging.
Return procedure for ISL9111EHADJZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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