My Inquiry
My Account
Renesas ISL9111AEH33Z-T
- Part No.:
- ISL9111AEH33Z-T
- Manufacturer:
- Renesas
- Package:
- SOT-23-6
- Datasheet:
-
ISL9111AEH33Z-T.pdf
- Description:
- IC REG BOOST 3.3V 800MA 6SOT
- Quantity:
- Payment:
- Shipping:
Inventory:3,808
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL9111AEH33Z-T from Renesas (formerly Intersil) is a low-input-voltage, high-efficiency synchronous boost converter with integrated 1A N- and P-channel MOSFETs, delivering a fixed 3.3V output. It starts up at 0.6V and operates down to 0.5V, supports 240mA output at 1.8V input, achieves up to 97% efficiency, and features skip mode for 20µA quiescent current-ideal for single-cell alkaline/NiMH-powered portable audio and wireless peripherals.
For engineers reviewing the ISL9111AEH33Z-T datasheet, ISL9111AEH33Z-T pinout, ISL9111AEH33Z-T application, or ISL9111AEH33Z-T equivalent, this page provides verified technical context, validated pin functions, confirmed load/line regulation specs, and real-world alternative options for battery-powered DC-DC design.
Technical Context
The ISL9111AEH33Z-T implements peak current-mode PWM control with internal compensation and a 1.2MHz oscillator, enabling stable operation with minimal external components. Its synchronous rectification replaces Schottky diodes with low-rDS(ON) MOSFETs (0.2Ω N-ch, 0.35Ω P-ch), eliminating body-diode conduction loss during shutdown via active polarity reversal.
Unlike the ISL9111 variant, the ISL9111A disables UVLO to maximize non-rechargeable battery life-enabling operation from 0.5V post-startup-and integrates output disconnect, thermal shutdown (150°C), and fault reporting via an open-drain FAULT pin tied to overvoltage (ADJ only), short-circuit, and undervoltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±100mV-ensures stable rail for 3.3V logic, USB-OTG PHY, and Bluetooth baseband without external feedback resistors. |
| Start-up Voltage | 0.6V typical-enables power-up from deeply discharged single-cell alkaline batteries before conventional boost ICs activate. |
| Min Operating Voltage | 0.5V after start-up-extends usable battery life in non-rechargeable applications by extracting energy down to near-dead cell voltage. |
| Switching Frequency | 1.2MHz (1.0–1.4MHz range)-permits use of tiny 4.7µH inductors and ceramic capacitors, minimizing solution footprint in space-constrained wearables. |
| Quiescent Current | 20µA typical in skip mode-reduces no-load drain on primary cells, directly extending shelf life and runtime in always-on sensor nodes. |
| Peak Switch Current | 1.0A typical-supports 240mA output at 3.3V from 1.8V input while maintaining >90% efficiency across light-to-moderate loads. |
| Thermal Shutdown | 150°C with 25°C hysteresis-protects against sustained overload or poor PCB thermal design without requiring external thermal monitoring. |
Pinout & Package
ISL9111AEH33Z-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. The fixed-output version uses internal resistor divider and includes FAULT reporting-no FB pin required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power switch node | Connects to inductor's switched terminal; carries high di/dt current-requires short, wide trace routing to minimize EMI and voltage spikes. |
| 2 GND | Power and signal ground | Primary return path for input/output capacitors and inductor; must connect to solid ground plane to ensure stability and EMI control. |
| 3 EN | Enable control input | Active-high logic input (0.8×VIN threshold); pulls device into <1µA shutdown when low, fully disconnecting VOUT from VIN. |
| 4 FAULT | Open-drain fault indicator | Asserts low under short-circuit, thermal shutdown, or output undervoltage-enables system-level fault logging without polling. |
| 5 VOUT | Regulated output | Delivers fixed 3.3V; requires 4.7µF ceramic capacitor placed adjacent to pin and GND for ripple suppression and transient response. |
| 6 VIN | Input supply | Accepts 0.5–3.1V (VOUT − 200mV); requires local 4.7µF ceramic capacitor between VIN and GND to stabilize low-impedance battery source. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated N- and P-channel MOSFETs replace Schottky diode-eliminates 300–500mV forward drop, enabling >90% efficiency at light loads. |
| Output disconnect | Active polarity reversal of P-MOSFET body diode during shutdown-prevents battery drain through load, critical for long-term storage. |
| Skip mode operation | Enters pulse-skipping below ~1mA load-reduces average switching losses and holds quiescent current to 20µA, maximizing battery life. |
| Digital soft-start | Linear ramp + fixed 75% duty cycle until VOUT reaches 2.3V-limits inrush current to ~200mA, protecting weak primary cells and input caps. |
| Fault protection suite | Monitors short-circuit, thermal overload (150°C), and output undervoltage-asserts FAULT pin within 2ms of fault detection for rapid system response. |
Applications
| Wireless Headset Power Management | Portable Medical Glucose Meter |
|---|---|
Use Scenario: Powers Bluetooth audio codec and RF transceiver from single AA alkaline cell with variable discharge profile. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated 3.3V rail during full transmit bursts and ultra-low-quiescent standby. Use Value: 0.6V start-up and 0.5V operating capability extract >15% additional energy from primary cell versus 0.8V-start competitors. |
Use Scenario: Supplies 3.3V to microcontroller, LCD, and electrochemical sensor interface in handheld diagnostic device. IC Role / Device Role / Timing Role: Primary DC-DC regulator enabling operation across full battery voltage range (1.5V → 0.6V) without brownout resets. Use Value: Output disconnect prevents battery self-discharge during 6-month shelf life; FAULT pin alerts firmware to low-VIN shutdown events. |
| USB-OTG Host in Portable Media Player | Wireless Keyboard/Mouse Transceiver |
Use Scenario: Generates stable 3.3V for USB OTG PHY and controller during host negotiation and data transfer from single-cell NiMH. IC Role / Device Role / Timing Role: High-efficiency boost stage ensuring VBUS compliance and low-noise power for USB signaling integrity. Use Value: 1.2MHz switching avoids AM radio band interference; 240mA capability supports simultaneous HID + storage enumeration. |
Use Scenario: Powers 2.4GHz RF SoC and touch-sensing MCU in ultra-thin keyboard using AAA alkaline cells. IC Role / Device Role / Timing Role: Always-on power manager delivering 3.3V with sub-µA shutdown leakage and fast wake-up from EN assertion. Use Value: 20µA skip-mode current extends battery life to >12 months; FAULT reporting enables predictive battery replacement alerts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS61099YFFR | 0.7V start-up, 3.3V fixed output, 1.2MHz, but only 400mA peak switch current and no FAULT pin. | Lacks fault reporting and lower current capability limits use in burst-mode RF loads above 200mA. | Choose for cost-sensitive, lower-current applications where fault visibility is not required. |
| Analog Devices ADP5070ACPZ-R7 | Adjustable output (1.2–5.5V), 2.5A switch, but requires external compensation and has 1.4V minimum start-up. | Cannot operate below 1.4V-unsuitable for depleted single-cell alkaline/NiMH; higher complexity increases BOM count. | Choose when adjustable output and higher current are needed, and input voltage remains ≥1.4V. |
Compared with TPS61099YFFR and ADP5070ACPZ-R7, the ISL9111AEH33Z-T uniquely combines ultra-low 0.6V start-up, integrated FAULT reporting, and 1A switch capability in a 6-pin SOT-23-making it optimal for space-constrained, single-cell battery systems demanding maximum runtime and fault-aware operation.
Availability
ISL9111AEH33Z-T is available at Aetrix Electronics and suitable for portable medical devices, wireless peripherals, and USB-OTG host implementations requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9111AEH33Z-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 (acquired Intersil in 2017) is a global leader in microcontrollers, analog, and power management ICs, serving industrial, automotive, and consumer markets with high-reliability semiconductor solutions.
The ISL9111A family was designed specifically for ultra-low-voltage battery-powered applications-enabling extended runtime in single-cell alkaline, NiCd, and NiMH systems where every millivolt of battery voltage must be utilized.
FAQ
What is the minimum input voltage required for ISL9111AEH33Z-T to start switching?
The ISL9111AEH33Z-T has a typical start-up voltage of 0.6V under no-load conditions, enabling operation from nearly exhausted single-cell alkaline or NiMH batteries. This is 0.2V lower than the ISL9111 variant, reflecting its optimization for non-rechargeable applications. The ISL9111AEH33Z-T will begin regulating 3.3V output once VIN exceeds this threshold and EN is asserted high.
Does ISL9111AEH33Z-T include undervoltage lockout (UVLO) functionality?
No-the ISL9111AEH33Z-T disables UVLO to maximize usable energy from non-rechargeable batteries. Unlike the ISL9111, which shuts down at 0.7V to protect rechargeable cells, the ISL9111AEH33Z-T continues operating down to 0.5V after start-up. This design choice allows full depletion of primary cells without premature cutoff.
How does the FAULT pin on ISL9111AEH33Z-T behave during a short-circuit event?
During a short-circuit condition-detected when VOUT falls below VIN-the ISL9111AEH33Z-T immediately asserts the FAULT pin low and halts switching. The device automatically attempts restart after 200ms. The FAULT pin remains low until the short is removed or VIN/VOUT collapse, providing unambiguous system-level fault signaling without software polling.
Can ISL9111AEH33Z-T be used with an adjustable output voltage?
No-ISL9111AEH33Z-T is a fixed 3.3V output variant with internal feedback divider. For adjustable output, select ISL9111AEHADJZ-T, which exposes the FB pin and requires external R1/R2 resistors. The ISL9111AEH33Z-T lacks FB connectivity and substitutes the FAULT pin in its 6-pin SOT-23 layout, making output voltage reconfiguration impossible.
What thermal performance can be expected from ISL9111AEH33Z-T in a standard 2-layer PCB layout?
In a standard 2-layer board with 1oz copper and no thermal vias, the ISL9111AEH33Z-T exhibits a junction-to-ambient thermal resistance (θJA) of 146°C/W. At 240mA output and 1.8V input, typical power dissipation is ~120mW-resulting in ~17.5°C junction rise above ambient. Thermal shutdown triggers only under sustained overload or inadequate copper area.
ISL9111AEH33Z-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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.6V
- 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
ISL9111AEH33Z-T FAQ
1.How can I place an order for ISL9111AEH33Z-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9111AEH33Z-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 ISL9111AEH33Z-T reliable?
The price and inventory of ISL9111AEH33Z-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9111AEH33Z-T is usually 5 days.
3.What payment methods are accepted for ISL9111AEH33Z-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9111AEH33Z-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9111AEH33Z-T?
ISL9111AEH33Z-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9111AEH33Z-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 ISL9111AEH33Z-T?
For technical support, including ISL9111AEH33Z-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9111AEH33Z-T requirements.
6.How does Aetrix verify that ISL9111AEH33Z-T is sourced from the original manufacturer or authorized distributors?
All ISL9111AEH33Z-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 ISL9111AEH33Z-T meets industry standards.
7.What is the process for return or replacement of ISL9111AEH33Z-T?
All ISL9111AEH33Z-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9111AEH33Z-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 ISL9111AEH33Z-T part is unused and in its original packaging.
Return procedure for ISL9111AEH33Z-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL9111AEH33Z-T Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
