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Renesas ISL9111AEHADJZ-T
- Part No.:
- ISL9111AEHADJZ-T
- Manufacturer:
- Renesas
- Package:
- SOT-23-6
- Datasheet:
-
ISL9111AEHADJZ-T.pdf
- Description:
- IC REG BOOST ADJ 800MA 6SOT
- Quantity:
- Payment:
- Shipping:
Inventory:1,140
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Product details
Overview
ISL9111AEHADJZ-T from Renesas (formerly Intersil) is a low-input-voltage, high-efficiency synchronous boost converter with integrated 1A N-channel and P-channel MOSFETs, designed for single-cell alkaline/NiMH battery-powered systems. It starts up at 0.6V, delivers adjustable output from 2.5V to 5.25V, achieves up to 97% efficiency at typical loads, and operates at 1.2MHz switching frequency to enable compact 4.7µH inductor + ceramic capacitor designs. It serves as the primary power stage in portable USB-OTG and Bluetooth headset power rails.
For engineers reviewing the ISL9111AEHADJZ-T datasheet, ISL9111AEHADJZ-T pinout, ISL9111AEHADJZ-T application, or ISL9111AEHADJZ-T equivalent, this page provides verified technical context, confirmed pin functions, real-world application mappings, and validated alternative options - all grounded in FN7602 Rev.4.00 and official Renesas product documentation.
Technical Context
The ISL9111AEHADJZ-T implements peak current-mode PWM control with internal slope compensation and a 1.2MHz oscillator. Its dual-MOSFET synchronous rectification replaces Schottky diodes, eliminating conduction loss and enabling >90% efficiency even at light loads.
It features adaptive skip mode (triggered after eight consecutive zero-current crossings), digital soft-start with 1ms ramp-up, and integrated fault protection including OVP (5.9V threshold), OTP (150°C shutdown), and short-circuit detection. The adjustable version uses an external resistor divider on the FB pin to set output voltage with 800mV ±16mV reference accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.5V to (VOUT − 200mV): enables full discharge of non-rechargeable cells down to 0.5V post-startup. |
| Output Voltage Range | 2.5V to 5.25V (adjustable via FB pin): supports wide system rail requirements including 3.3V logic and 5V USB-OTG compliance. |
| Switching Frequency | 1.0–1.4MHz (typ. 1.2MHz): permits use of miniature 4.7µH inductors and low-ESR ceramic capacitors for space-constrained PCBs. |
| Peak Switch Current Limit | 0.8–1.2A (typ. 1.0A): ensures robust operation under transient load steps while limiting inductor saturation risk. |
| Quiescent Current | 20µA (typ.): extends battery life in standby by minimizing no-load drain in skip mode. |
| Feedback Reference Voltage | 784–816mV (typ. 800mV): defines output accuracy and sets resistor-divider design margin for ±1.5% VOUT regulation. |
| OVP Threshold | 5.9V (typ.) with 400mV hysteresis: protects downstream 5V-tolerant ICs from overvoltage during transients or feedback faults. |
Pinout & Package
ISL9111AEHADJZ-T is housed in a Pb-free 6-lead SOT-23 package (JEDEC MO-178AB, pkg drawing P6.064), with 146°C/W junction-to-ambient thermal resistance and -20°C to +85°C operating ambient range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switching node | Connects to inductor's switch-side terminal; carries high di/dt current and requires minimized trace area to reduce EMI. |
| 2 - GND | Power ground | Primary return path for input/output capacitors and MOSFET sources; must be solid plane for stability and thermal dissipation. |
| 3 - EN | Enable input | Active-high logic control (0.2×VIN low / 0.8×VIN high); pulls device into <1µA shutdown state when low, disconnecting VOUT from VIN. |
| 4 - FB | Feedback input | Senses divided output voltage; sets regulated VOUT = 0.8V × (1 + R1/R2); requires low-noise layout near pin with tight resistor placement. |
| 5 - VOUT | Regulated output | Delivers final boosted rail; connects to 4.7µF ceramic output capacitor and load; provides output disconnect during shutdown. |
| 6 - VIN | Input supply | Accepts 0.5V–5.05V; connects to 4.7µF ceramic input capacitor and battery/analog rail; supplies internal bias and gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated N- and P-channel MOSFETs (rDS(ON) = 0.2Ω / 0.35Ω) replace Schottky diode, reducing conduction loss and enabling >90% efficiency at light loads. |
| Ultra-low startup voltage | 0.6V minimum start-up (ISL9111A variant) maximizes usable energy from single alkaline/NiMH cells without UVLO cutoff. |
| Output disconnect in shutdown | Internal circuitry reverses P-MOSFET body diode polarity during EN=low, fully isolating battery from load to prevent depletion. |
| Integrated OVP protection | 5.9V overvoltage threshold (ADJ version only) actively halts switching and discharges inductor energy safely through synchronous rectifier body diode. |
| Skip mode optimization | Enters pulse-skipping at light loads (eight zero-current crossings), reducing average switching losses and maintaining 20µA quiescent current. |
Applications
| USB-OTG Power Supply | Bluetooth Headset Core Rail |
|---|---|
Use Scenario: Powers USB-OTG host functionality from a single 1.5V alkaline cell in portable media players or docking adapters. IC Role / Device Role / Timing Role: Primary synchronous boost regulator generating stable 5.0V rail with fast load transient response for USB enumeration and data transfer. Use Value: Enables true single-cell 5V USB-OTG operation without requiring two cells or external charge pumps, reducing BOM count and board area. |
Use Scenario: Supplies clean 3.3V core voltage to Bluetooth audio SoC and RF transceiver in ultra-low-power wireless headsets. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter delivering regulated rail with minimal quiescent current during voice standby and streaming modes. Use Value: Extends battery runtime by >30% versus linear regulators due to 97% peak efficiency and 20µA skip-mode IQ. |
| Portable Medical Sensor Node | Wireless Keyboard/Mouse Transmitter |
Use Scenario: Powers precision analog front-end and BLE radio in handheld glucose meters or pulse oximeters using one AA battery. IC Role / Device Role / Timing Role: Low-noise, high-PSSR boost converter providing stable 3.3V for ADC reference and RF subsystems. Use Value: Maintains measurement accuracy across full battery discharge (0.5V–1.5V input) while meeting IEC 60601 EMC limits via 1.2MHz fixed-frequency operation. |
Use Scenario: Generates 3.0V rail for microcontroller and 2.4GHz RF transmitter in energy-harvesting or coin-cell-powered peripherals. IC Role / Device Role / Timing Role: Ultra-low-VIN boost regulator supporting intermittent burst transmission with rapid startup (<1ms soft-start). Use Value: Allows operation down to 0.5V input, extracting maximum energy from depleted alkaline cells and extending product lifetime per battery change. |
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 min start-up; 0.9–5.5V adjustable output; 1.2MHz switching; no integrated OVP. | Lacks OVP and thermal shutdown; requires external components for fault handling in safety-critical medical devices. | Choose for lowest-VIN applications where OVP is managed externally and footprint is constrained (2mm × 2mm QFN). |
| MAX17065ETA+ | 0.5V min start-up; 2.5–5.5V output; 1.1MHz switching; includes I²C programmability and telemetry. | Offers digital interface and telemetry but larger 8-pin µDFN package and higher BOM cost. | Prefer when system-level power sequencing, voltage margining, or runtime monitoring is required beyond analog-only operation. |
Compared with TPS61200DRCT and MAX17065ETA+, the ISL9111AEHADJZ-T delivers superior integration (OVP, OTP, output disconnect) in a minimal 6-pin SOT-23 footprint, making it optimal for cost-sensitive, space-constrained battery-powered designs where analog simplicity and robustness are prioritized over digital configurability.
Availability
ISL9111AEHADJZ-T is available at Aetrix Electronics and suitable for portable medical sensors, Bluetooth audio accessories, USB-OTG peripherals, and wireless human-interface devices requiring stable component supply across long production lifecycles.
Supply support for ISL9111AEHADJZ-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
Renesas Electronics Corporation (formerly Intersil) is a global leader in power management and precision analog ICs, serving industrial, automotive, and consumer markets with high-reliability, energy-efficient solutions.
The ISL9111AEHADJZ-T belongs to Renesas' low-input-voltage boost converter family, engineered specifically for single-cell battery systems where deep discharge utilization, small solution size, and high light-load efficiency are critical design objectives.
FAQ
What is the minimum input voltage required for ISL9111AEHADJZ-T to start up and regulate?
The ISL9111AEHADJZ-T has a minimum start-up voltage of 0.6V under no-load conditions, as specified in FN7602 Rev.4.00. This allows it to initiate regulation from deeply discharged single-cell alkaline or NiMH batteries. Once started, it continues operating down to 0.5V input - a key differentiator for maximizing battery life in non-rechargeable applications. The ISL9111AEHADJZ-T achieves this via optimized gate drive and low-threshold MOSFETs.
Does ISL9111AEHADJZ-T provide output voltage disconnect during shutdown?
Yes, the ISL9111AEHADJZ-T provides true output disconnect during shutdown. When the EN pin is pulled low, internal circuitry reverses the polarity of the P-channel MOSFET's body diode, blocking reverse current flow from VOUT to VIN. This prevents battery depletion during system sleep or off-states - a critical feature confirmed in the "Synchronous Rectifier" section of FN7602 Rev.4.00. No external MOSFET or diode is needed.
What protection features are integrated into ISL9111AEHADJZ-T?
The ISL9111AEHADJZ-T integrates overvoltage protection (OVP), overtemperature protection (OTP), and short-circuit protection. OVP triggers at 5.9V (typ.) on the VOUT pin and is exclusive to the ADJ versions. OTP shuts down the device at 150°C with 25°C hysteresis. Short-circuit detection forces immediate shutdown if VOUT falls below VIN. All protections are detailed in Table 1 (page 10) of FN7602 Rev.4.00.
How is the output voltage set for ISL9111AEHADJZ-T?
The ISL9111AEHADJZ-T uses an external resistor divider between VOUT, FB, and GND to set output voltage per Equation 1 in FN7602 Rev.4.00: VOUT = 0.8V × (1 + R1/R2). The internal feedback reference is 784–816mV (typ. 800mV). For example, R1 = 923kΩ and R2 = 166kΩ yields 5.25V. Resistors must be placed close to the FB pin to avoid noise coupling, and high values (>100kΩ total) are recommended to minimize divider current and preserve efficiency.
What is the purpose of the SW pin on ISL9111AEHADJZ-T, and how should it be routed?
The SW pin on ISL9111AEHADJZ-T is the switching node connecting to the inductor's switch-side terminal. It carries high di/dt current and generates significant EMI. Per FN7602 Rev.4.00 Section "Board Layout Recommendations", the SW trace must be short and wide, kept away from noise-sensitive nodes like FB, and not run parallel to other signal traces. A solid ground plane underneath is mandatory to contain field emissions and ensure stable regulation of the ISL9111AEHADJZ-T.
ISL9111AEHADJZ-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):
- 0.6V
- 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
ISL9111AEHADJZ-T FAQ
1.How can I place an order for ISL9111AEHADJZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9111AEHADJZ-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 ISL9111AEHADJZ-T reliable?
The price and inventory of ISL9111AEHADJZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9111AEHADJZ-T is usually 5 days.
3.What payment methods are accepted for ISL9111AEHADJZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9111AEHADJZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9111AEHADJZ-T?
ISL9111AEHADJZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9111AEHADJZ-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 ISL9111AEHADJZ-T?
For technical support, including ISL9111AEHADJZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9111AEHADJZ-T requirements.
6.How does Aetrix verify that ISL9111AEHADJZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9111AEHADJZ-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 ISL9111AEHADJZ-T meets industry standards.
7.What is the process for return or replacement of ISL9111AEHADJZ-T?
All ISL9111AEHADJZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9111AEHADJZ-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 ISL9111AEHADJZ-T part is unused and in its original packaging.
Return procedure for ISL9111AEHADJZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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