Overview

The ISL97691 is Intersil’s highly integrated 4 channel LED driver for single cell Li-Ion battery operated mobile displays requiring analog dimming, and for 3D mobile display applications. It drives four 40mA channels of LEDs up to 26V from an input supply 2. 4V to 5. 5V. The ISL97691 will also drive 60mA channels up to 21V at 30% duty for high peak current 3D modes. The ISL97691 provides 4 channels of current with 2 independent analog dimming controls and 2 independent PWM dimming controls. Channels 1 and 2 form one channel group and channels 3 and 4 form the other channel group. Each channel group’s analog dimming is controlled through 1-Wire communication with 6-bit resolution and each channel group’s PWM dimming is controlled by a separate PWM input. This unique setup allows 2D or 3D application where independent and dynamic channel control of LED peak current and PWM dimming duty cycle are possible. The ISL97691 employs adaptive boost architecture that allows ultra low dimming duty cycle as low as 0. 005% at 100Hz dimming frequency. The driver features dynamic headroom control that monitors the highest LED forward voltage string and uses its feedback signal for the minimum output regulation. The ISL97691 incorporates extensive protection functions including string open and short circuit detections, OVP, and OTP. The switching frequency can be adjusted from 400kHz to 1. 5MHz. The device is offered in a 16 Ld TQFN 3x3mm package and can operate in ambient temperature from -40°C to +85°C.

ISL97691 Functional Diagram
ISL97691 Functional Diagram
  • 2.4V minimum input voltage, no need for higher voltage supplies
  • 4 x 60mA (Note 1) and 4 x 40mA (Note 2) LED current
  • 2 groups of independent analog and pwm current controls
  • 1-wire interfaces for 6-bit analog dimming
  • PWM inputs for PWM dimming
  • 0.005% minimum PWM dimming duty cycle at 100Hz
  • Low 0.8mA quiescent current
  • ±2.5% current matching
  • Adjustable switching frequency from 400kHz to 1.5MHz
  • Fault protection
  • OVP, OTP, channel open/short circuit protections
    NOTES: 1. Not exceeding 30% of the frame rate (1/tFRAME), with VIN > 2.7V and TA < +55°C
    2. VIN > 2.7V

Applications

  • Tablet, notebook PC and smart phone displays LED backlighting
  • Mobile displays for 2D or 3D LED backlighting

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models
Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Carrier Type
    MOQ
    Buy / Sample
    Part Number
    ISL97691IRTZ
    circleObsolete
    memory
    spa
    view_in_ar
    		TQFN Tube 1000
    ISL97691IRTZ-T
    circleObsolete
    memory
    spa
    view_in_ar
    		TQFN Reel 6000
    ISL97691IRTZ-TK
    circleObsolete
    memory
    spa
    view_in_ar
    		TQFN Reel 1000
    Parametric Table tips

    Tips for Using This Parametric Table:

    • Hide Filters button in header: Collapse or expands filters
    • Column sort buttons in header: Sort Column alphabetically / numerically descending or ascending
    • Reset button in header: Reset all filters to the page default
    • Full Screen button in header: Expand the table to full screen view (user must close out of full screen before they can interact with rest of page)
    • Export button in header: Export the filtered results of the table to an Excel document
    • Filter parts search bar in header: Type to filter table results by part number
    • Hide column button in column headers: Select to hide columns in table
    • AND / OR toggle switches in header: Toggles the logic of this particular filter to be “AND” or “OR” logic for filtering results
    • Multiselect checkboxes at beginning of each row in table: Select these checkboxes to compare products against each other
    • Document icon next to product name in row: View the featured document for this product
    • Chip icon next to the right of the document icon in row: View the block diagram for this product
    • Cart icon to the right of the chip icon: Indicates that samples are available for this product