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Renesas ISL6840IU-T
- Part No.:
- ISL6840IU-T
- Manufacturer:
- Renesas
- Category:
- Power Supply Controllers, Monitors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL6840IU-T.pdf
- Description:
- IC REG CTRLR BOOST/FLYBACK 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,866
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Product details
Overview
ISL6840IU-T from Renesas Electronics is a single-ended current mode PWM controller designed for boost, flyback, and isolated buck regulators. It delivers 1A peak gate drive, supports up to 2MHz switching frequency, features 60µA start-up current, and provides 100% maximum duty cycle with 7.0V UVLO rising threshold - enabling stable operation in telecom power and industrial DC-DC converters.
For engineers reviewing the ISL6840IU-T datasheet, ISL6840IU-T pinout, ISL6840IU-T application, or ISL6840IU-T equivalent, key selection criteria include its adjustable oscillator (RTCT pin), tight 5.00V ±1.0%/−1.5% reference tolerance over temperature, 25ns CS-to-OUT propagation delay, and compatibility with standard 384x-family layouts while offering improved transient response and lower operating current.
Technical Context
The ISL6840IU-T implements peak current mode control using an internal 5V reference, high-bandwidth error amplifier, and fast PWM comparator with 100mV CS offset. Its oscillator uses external RT/CT components to generate a programmable sawtooth waveform, enabling precise frequency and maximum duty cycle control up to 2MHz.
It integrates a 1A totem-pole output stage with 20ns rise/fall times into 1nF load, UVLO with 7.0V ON / 6.6V OFF hysteresis, and VREF fault detection (4.65V trip, 4.80V recovery). The COMP pin serves as both error amplifier output and PWM comparator input, supporting standard Type II/III compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Adjustable up to 2MHz via RT/CT; enables compact magnetics and high-efficiency designs in space-constrained applications. |
| Max Duty Cycle | 100%; supports continuous conduction mode (CCM) flyback and boost topologies without external duty cycle limiting. |
| Start-up Current | 60µA typical; reduces auxiliary supply burden and improves light-load efficiency in offline adapters. |
| VREF Accuracy | ±1.0%/−1.5% over line, load, and −40°C to +105°C; ensures stable feedback regulation across operating conditions. |
| CS-to-OUT Delay | 25ns typical; enables fast overcurrent response and tight current limit protection in high-speed power stages. |
| Gate Drive Strength | 1A peak sink/source; directly drives medium-power MOSFETs without external buffers in sub-100W converters. |
| UVLO Threshold | Rising: 7.0V, Falling: 6.6V; provides robust brown-out immunity for 8–15V input rails in telecom and industrial supplies. |
Pinout & Package
ISL6840IU-T is housed in an 8-lead MSOP package (M8.118), with exposed pad not electrically connected. The package measures 3.0mm × 4.9mm × 1.1mm and supports Pb-free reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Error amplifier output / PWM comparator input | Connects to FB via RC network for loop compensation; sets bandwidth and phase margin of voltage control loop. |
| 2 - FB | Inverting input of error amplifier | Receives scaled output voltage; referenced internally to 2.514V nominal; determines regulated output setpoint. |
| 3 - CS | Current sense input | Accepts 0–1.0V signal with 100mV offset; triggers PWM shutdown on sensed current exceeding threshold. |
| 4 - RTCT | Oscillator timing control | Connects RT resistor to VREF and CT capacitor to GND; sets switching frequency and max duty cycle via charge/discharge timing. |
| 5 - GND | Power and signal reference ground | Must be low-impedance plane; separates high-di/dt power return from analog signal return to minimize noise coupling. |
| 6 - OUT | High-current gate driver output | Sources/sinks 1A peak; drives N-channel MOSFET gates directly; requires series gate resistor for damping and EMI control. |
| 7 - VDD | Supply input | Operates from 7.5–14V; bypass with ≥0.1µF ceramic capacitor near pin to suppress supply noise and support transient current demands. |
| 8 - VREF | 5.00V precision reference output | Supplies RT resistor and optional external circuitry; requires 0.1–3.3µF bypass capacitor to maintain stability and accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Peak current mode control | Enables inherent cycle-by-cycle overcurrent protection and fast transient response without slope compensation below 50% duty cycle. |
| Trimmed RTCT discharge current | Ensures accurate deadtime and maximum duty cycle control across temperature, critical for CCM flyback reliability. |
| High-bandwidth error amplifier | 60–90dB open-loop gain supports wide bandwidth compensation for fast load step recovery in server VRMs. |
| Tight current limit threshold | Minimizes unit-to-unit variation in overcurrent trip point, improving system-level current limit consistency across production batches. |
| 20ns rise/fall time (1nF load) | Reduces switching losses and EMI generation during MOSFET transitions, especially beneficial at >500kHz frequencies. |
Applications
| Telecom Power Supply | Industrial DC-DC Converter |
|---|---|
Use Scenario: 48V input dual-output flyback supplying 1.8V and 3.3V to baseband processing units in wireless infrastructure equipment. IC Role / Device Role / Timing Role: Primary-side PWM controller regulating output voltage via optocoupler feedback; sets switching frequency and duty cycle based on load demand. Use Value: 100% duty cycle capability and 25ns current-sense delay enable precise current limiting and stable multi-rail regulation under dynamic RF load transients. | Use Scenario: Isolated buck regulator converting 24V industrial bus to 5V/3A for PLC I/O modules operating in harsh ambient environments. IC Role / Device Role / Timing Role: Current-mode controller managing transformer reset and output regulation; UVLO hysteresis prevents erratic startup during brownouts. Use Value: 60µA start-up current and −40°C to +105°C rating ensure reliable cold-start performance and long-term stability in unventilated enclosures. |
| PC Power Adapter | File Server VRM |
Use Scenario: Compact 65W boost PFC front-end followed by ISL6840IU-T-controlled flyback for +12V standby rail in desktop ATX PSUs. IC Role / Device Role / Timing Role: Secondary-side controller implementing constant-voltage regulation with fast transient response to CPU sleep/wake events. Use Value: 1A gate drive eliminates need for external driver, reducing BOM count and PCB area in cost-sensitive consumer power designs. | Use Scenario: Multiphase VRM for high-performance CPUs requiring tightly regulated 1.2V/100A output with fast load-step response. IC Role / Device Role / Timing Role: Single-phase controller in interleaved configuration; synchronized via external clock to reduce input/output ripple. Use Value: Adjustable 2MHz frequency allows optimal trade-off between efficiency and component size, while 5.00V reference ensures <±1% output accuracy across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2800DR | Fixed 500kHz frequency; 500mA gate drive; no adjustable max duty cycle; 1.5V CS threshold vs. ISL6840IU-T's 1.0V range with 100mV offset. | Targeted at cost-sensitive AC-DC adapters; lacks 2MHz capability and 100% duty cycle needed for high-VIN flyback. | Select UCC2800DR only for fixed-frequency, lower-power (<30W), non-isolated applications where layout simplicity outweighs performance flexibility. |
| TL3842P | Legacy BiCMOS design; 1A drive but 35ns CS-to-OUT delay; 17V max VDD; no trimmed RTCT discharge; ±2% VREF tolerance. | Used in legacy industrial supplies; limited thermal performance in MSOP due to higher θJA (165°C/W). | Choose TL3842P only for drop-in replacement in existing designs where ISL6840IU-T's tighter tolerances and faster timing are not required. |
Compared with UCC2800DR and TL3842P, the ISL6840IU-T offers superior frequency agility (up to 2MHz), tighter reference and current-sense accuracy, and faster propagation delay - making it preferred for high-density, high-transient telecom and server power where regulation precision and response speed are critical.
Availability
ISL6840IU-T is available at Aetrix Electronics and suitable for telecom power supplies, industrial DC-DC converters, and PC power adapters requiring stable component supply, extended temperature operation, and RoHS-compliant packaging.
Supply support for ISL6840IU-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 is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and datacenter applications.
The ISL6840IU-T belongs to Renesas' high-performance PWM controller product line, engineered specifically for efficient, reliable, and compact isolated and non-isolated DC-DC conversion in demanding power systems.
FAQ
What is the maximum operating frequency supported by the ISL6840IU-T?
The ISL6840IU-T supports an adjustable switching frequency up to 2MHz, set via external RT resistor and CT capacitor on the RTCT pin. This high-frequency capability enables smaller magnetic components and faster transient response in compact power supplies, as confirmed in the FN9124 datasheet Section 2.4 and Figure 7.
Does the ISL6840IU-T provide 100% duty cycle operation?
Yes, the ISL6840IU-T supports 100% maximum duty cycle, as specified in the part number table on page 1 of FN9124. This feature is essential for continuous conduction mode (CCM) flyback and boost topologies where full-on operation is required during heavy loads or low-input conditions.
What is the UVLO threshold for the ISL6840IU-T?
The ISL6840IU-T has a rising UVLO threshold of 7.0V and falling threshold of 6.6V, providing 0.4V hysteresis. This ensures clean startup and shutdown behavior in 8–14V input rails common in telecom and industrial power systems, as documented in Section 2.4 Electrical Specifications of FN9124.
Can the ISL6840IU-T drive a power MOSFET directly?
Yes, the ISL6840IU-T integrates a 1A peak gate driver on the OUT pin, capable of directly driving medium-power N-channel MOSFETs without external buffers. Rise and fall times are 20ns into a 1nF load, as verified in FN9124 Section 2.4, making it suitable for sub-100W converters.
What package type is used for the ISL6840IU-T?
The ISL6840IU-T is packaged in an 8-lead MSOP (M8.118) with dimensions 3.0mm × 4.9mm × 1.1mm. This thermally enhanced surface-mount package supports operation from −40°C to +105°C and is RoHS-compliant, as detailed in the Ordering Information table on page 5 of FN9124.
ISL6840IU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- -
- Applications:
- Industrial Power Systems
- Voltage - Input:
- -
- Voltage - Supply:
- 7.5V ~ 14V
- Current - Supply:
- 5.5 mA
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
ISL6840IU-T FAQ
1.How can I place an order for ISL6840IU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6840IU-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 ISL6840IU-T reliable?
The price and inventory of ISL6840IU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6840IU-T is usually 5 days.
3.What payment methods are accepted for ISL6840IU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6840IU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6840IU-T?
ISL6840IU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6840IU-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 ISL6840IU-T?
For technical support, including ISL6840IU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6840IU-T requirements.
6.How does Aetrix verify that ISL6840IU-T is sourced from the original manufacturer or authorized distributors?
All ISL6840IU-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 ISL6840IU-T meets industry standards.
7.What is the process for return or replacement of ISL6840IU-T?
All ISL6840IU-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6840IU-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 ISL6840IU-T part is unused and in its original packaging.
Return procedure for ISL6840IU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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