Patents Assigned to Advanced Analogic Technologies, Inc.
  • Patent number: 9232587
    Abstract: A distributed system for driving strings of series-connected LEDs for backlighting, display and lighting applications includes multiple intelligent satellite LED driver ICs connected to a an interface IC via serial bus. The interface IC translates information obtained from a host microcontroller into instructions for the satellite LED driver ICs pertaining to such parameters as duty factor, current levels, phase delay and fault settings. Fault conditions in the LED driver ICs can be transmitted back to the interface IC. An analog current sense feedback system which also links the LED driver ICs determines the supply voltage for the LED strings.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: January 5, 2016
    Assignee: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventors: Richard K. Williams, Kevin D'Angelo, David A. Brown, George A. Hariman
  • Patent number: 9210753
    Abstract: A system for controlling multiple strings of LEDs includes a group of LED driver ICs, each of which includes a current sense feedback (CSFB) sample latch for storing a digital representation of the forward-voltage drop across a controlled LED string. Each CSFB latch is coupled to a register within a serial lighting interface (SLI) bus that both originates and terminates at an interface IC. As the data on the SLI bus is shifted into the interface IC, the interface IC selects the CSFB word that represents the highest forward-voltage drop of any of the controlled LED strings, which is then used by the interface IC to generate a CSFB signal for setting the appropriate supply voltage for the controlled LED strings.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: December 8, 2015
    Assignee: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventors: Richard K. Williams, Kevin D'Angelo, David A. Brown
  • Patent number: 8810162
    Abstract: An LED driver IC for driving external strings of LEDs comprises a prefix register and a data register connected in series with each other and with the prefix and data registers in other driver ICs. The prefix and data registers of the driver ICs are connected in a daisy chain arrangement with an interface IC. The interface IC loads data identifying a functional latch into the prefix register and data defining a functional condition into the data register of each driver IC. The data in the data register is then transferred to the functional latch to control the functional condition within the LED driver IC.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: August 19, 2014
    Assignee: Advanced Analogic Technologies, Inc.
    Inventors: Richard Kent Williams, Kevin D'Angelo, David A. Brown
  • Patent number: 8786216
    Abstract: An LED driver IC for driving external strings of LEDs comprises a prefix register and a data register connected in series with each other and with the prefix and data registers in other driver ICs. The prefix and data registers of the driver ICs are connected in a daisy chain arrangement with an interface IC. The interface IC loads data identifying a functional latch into the prefix register and data defining a functional condition into the data register of each driver IC. The data in the data register is then transferred to the functional latch to control the functional condition within the LED driver IC.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: July 22, 2014
    Assignee: Advanced Analogic Technologies, Inc.
    Inventors: Richard Kent Williams, Kevin D'Angelo, David A. Brown
  • Patent number: 8778740
    Abstract: To avoid shorts between adjacent die pads in mounting a multi-die semiconductor package to a printed circuit board (PCB), one of the die pads is embedded in the polymer capsule, while the other die pad is exposed at the bottom of the package to provide a thermal escape path to the PCB. This arrangement is particularly useful when one of the dice in a multi-die package generates more heat than another die in the package. A process for fabricating the package includes a partial etch that defines the bottom surface of the embedded die pad and may include a through-etch that leaves one or more of the contacts or leads integrally connected to the embedded die pad.
    Type: Grant
    Filed: May 19, 2013
    Date of Patent: July 15, 2014
    Assignees: Advanced Analogic Technologies Inc., Advanced Analogic Technologies (Hong Kong) Limited
    Inventors: Richard K. Williams, Keng Hung Lin
  • Patent number: 8779696
    Abstract: An LED driver IC for driving external strings of LEDs comprises a prefix register and a data register connected in series with each other and with the prefix and data registers in other driver ICs. The prefix and data registers of the driver ICs are connected in a daisy chain arrangement with an interface IC. The interface IC loads data identifying a functional latch into the prefix register and data defining a functional condition into the data register of each driver IC. The data in the data register is then transferred to the functional latch to control the functional condition within the LED driver IC.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: July 15, 2014
    Assignee: Advanced Analogic Technologies, Inc.
    Inventors: Richard Kent Williams, Kevin D'Angelo, David A. Brown
  • Publication number: 20140191740
    Abstract: A Voltage Converting LED Circuit with Switched Capacitor Network contains a 2-way MOSFET switch that connects a capacitor network to the output of an error amplifier, thereby enabling the error amplifier to resume operation quickly after the off-time segment of a PWM cycle. The switch is controlled synchronously with current sinks controlling brightness and color levels. In a preferred embodiment, multiple serially connected strings of LED's can be controlled simultaneously via one switch.
    Type: Application
    Filed: November 3, 2009
    Publication date: July 10, 2014
    Applicant: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventor: Xiaofan Chen
  • Patent number: 8749222
    Abstract: A cascode current sensor includes a main MOSFET and a sense MOSFET. The drain terminal of the main MOSFET is connected to a power device whose current is to be monitored, and the source and gate terminals of the main MOSFET are connected to the source and gate terminals, respectively, of the sense MOSFET. The drain voltages of the main and sense MOSFETs are equalized, in one embodiment by using a variable current source and negative feedback. The gate width of the main MOSFET is typically larger than the gate width of the sense MOSFET. Using the size ratio of the gate widths, the current in the main MOSFET is measured by sensing the magnitude of the current in the sense MOSFET. Inserting the relatively large MOSFET in the power circuit minimizes power loss.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: June 10, 2014
    Assignee: Advanced Analogic Technologies, Inc.
    Inventor: Richard K. Williams
  • Publication number: 20130313996
    Abstract: A step-up switching voltage regulator includes two or more inductors and a switching network. A control circuit drives the switching network in a repeating sequence that includes: a magnetizing phase where the inductors are connected in series between an input voltage and ground; and a charge transfer phase where the inductors are connected in parallel to provide current to an output node with at least one of the inductors is connected between ground and the output node.
    Type: Application
    Filed: August 19, 2008
    Publication date: November 28, 2013
    Applicant: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventor: Richard Williams
  • Publication number: 20130300293
    Abstract: An active clamp current sink is used to voltage protect a low voltage rated, high power current sink that drives illumination current through a string of serially connected LEDs. When the LEDs are turned off as part of a PWM configuration, the forward voltage on the LEDs falls, and the voltage presented to the low voltage rated, high power current sink rises. The active clamp current sink monitors the voltage across the high power current sink and ensures that an adequate current flows through the LEDs. This minimally adequate current maintains a sufficiently large forward voltage through the LEDs, and therefore a sufficiently small voltage is presented to the high power current sink.
    Type: Application
    Filed: April 5, 2011
    Publication date: November 14, 2013
    Applicant: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventor: Kevin D'Angelo
  • Publication number: 20130293208
    Abstract: A multiple chip voltage feedback technique allows multiple strings of LED's and current sinks to be efficiently powered by a DC-to-DC voltage converter within an appliance. A connected series of differential amplifiers or multiplexers are used to monitor the voltages between the connected LED's and the current sinks, progressively determine the lowest voltage, and then feed the lowest voltage back to the voltage converter. The DC-to-DC voltage converter monitors this lowest voltage and adjusts its output in order to ensure that the strings have adequate voltage with which to function, even as the LED's have different forward voltages and the strings are asynchronously enabled and disabled.
    Type: Application
    Filed: November 3, 2009
    Publication date: November 7, 2013
    Applicant: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventors: Kevin Peter D'Angelo, Eddie Lok Chuen Ng
  • Patent number: 8493036
    Abstract: Mobile devices have limited power sources. In some cases, such as camera flash operations in cell phones or digital cameras, the power required to provide bright illumination is significant and exceeding the battery voltage level. In order to supply burst power or continuous high power to light sources, such as white LEDs (light emitting diodes), mobile devices typically employ charge storage functioning as energy reservoir that can supply the required power. One such charge storage is a supercapacitor that can supply the needed power repeatedly by discharging and recharging. Various embodiments of the present invention include devices and methods for providing the charge energy and controlling the charge and discharge operations.
    Type: Grant
    Filed: November 14, 2006
    Date of Patent: July 23, 2013
    Assignee: Advanced Analogic Technologies, Inc.
    Inventor: Bruno Ferrario
  • Publication number: 20130162336
    Abstract: A multiple output DC-to-DC voltage converter using a new time-multiplexed-capacitor converter algorithm and related circuit topologies is herein disclosed. One embodiment of this invention includes a flying capacitor, a first output node, a second output node, and a switching network. The switching network configured to provide the following modes of circuit operation: 1) a first mode where the positive electrode of the flying capacitor is connected to an input voltage and the negative electrode of the flying capacitor is connected to ground; 2) a second mode where the negative electrode of the flying capacitor is connected to the input voltage and the positive electrode of the flying capacitor is connected to the first output node; and 3) a third mode where the positive electrode of the flying capacitor is connected to ground and the negative electrode of the flying capacitor is connected to the second output node.
    Type: Application
    Filed: November 11, 2012
    Publication date: June 27, 2013
    Applicant: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventor: Richard K. Williams
  • Publication number: 20130147372
    Abstract: A system for controlling multiple strings of LEDs includes a group of LED driver ICs, each of which includes a current sense feedback (CSFB) sample latch for storing a digital representation of the forward-voltage drop across a controlled LED string. Each CSFB latch is coupled to a register within a serial lighting interface (SLI) bus that both originates and terminates at an interface IC. As the data on the SLI bus is shifted into the interface IC, the interface IC selects the CSFB word that represents the highest forward-voltage drop of any of the controlled LED strings, which is then used by the interface IC to generate a CSFB signal for setting the appropriate supply voltage for the controlled LED strings.
    Type: Application
    Filed: January 10, 2012
    Publication date: June 13, 2013
    Applicant: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventors: Richard K. Williams, Kevin D'Angelo, David A. Brown
  • Publication number: 20130147370
    Abstract: A system for controlling multiple strings of LEDs includes a group of LED driver ICs, each of which includes a current sense feedback (CSFB) sample latch for storing a digital representation of the forward-voltage drop across a controlled LED string. Each CSFB latch is coupled to a register within a serial lighting interface (SLI) bus that both originates and terminates at an interface IC. As the data on the SLI bus is shifted into the interface IC, the interface IC selects the CSFB word that represents the highest forward-voltage drop of any of the controlled LED strings, which is then used by the interface IC to generate a CSFB signal for setting the appropriate supply voltage for the controlled LED strings.
    Type: Application
    Filed: January 9, 2012
    Publication date: June 13, 2013
    Applicant: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventors: Richard K. Williams, Kevin D'Angelo, David A. Brown
  • Publication number: 20130147375
    Abstract: A system for controlling multiple strings of LEDs includes a group of LED driver ICs, each of which includes a current sense feedback (CSFB) sample latch for storing a digital representation of the forward-voltage drop across a controlled LED string. Each CSFB latch is coupled to a register within a serial lighting interface (SLI) bus that both originates and terminates at an interface IC. As the data on the SLI bus is shifted into the interface IC, the interface IC selects the CSFB word that represents the highest forward-voltage drop of any of the controlled LED strings, which is then used by the interface IC to generate a CSFB signal for setting the appropriate supply voltage for the controlled LED strings.
    Type: Application
    Filed: January 10, 2012
    Publication date: June 13, 2013
    Applicant: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventors: Richard K. Williams, Kevin D'Angelo, David A. Brown
  • Publication number: 20130147371
    Abstract: A system for controlling multiple strings of LEDs includes a group of LED driver IC's, each of which includes a current sense feedback (CSFB) sample latch for storing a digital representation of the forward-voltage drop across a controlled LED string. Each CSFB latch is coupled to a register within a serial lighting interface (SLI) bus that both originates and terminates at an interface IC. As the data on the SLI bus is shifted into the interface IC, the interface IC selects the CSFB word that represents the highest forward-voltage drop of any of the controlled LED strings, which is then used by the interface IC to generate a CSFB signal for setting the appropriate supply voltage for the controlled LED strings.
    Type: Application
    Filed: January 10, 2012
    Publication date: June 13, 2013
    Applicant: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventors: Richard K. Williams, Kevin D'Angelo, David A. Brown
  • Patent number: 8446136
    Abstract: A method for controlling a step down regulator includes (a) generating a first feedback signal as a function of the voltage at the output node; (b) generating a second feedback signal as a function of the voltage at the input node; (c) maintaining the on-time of the low-side switch at a fixed duration; and (d) varying the on-time of the high-side switch to be proportional to the first feedback signal and inversely proportional to the second feedback signal so that the switching frequency of the high and low side switches is approximately constant.
    Type: Grant
    Filed: April 13, 2007
    Date of Patent: May 21, 2013
    Assignee: Advanced Analogic Technologies, Inc.
    Inventor: Matt Schindler
  • Publication number: 20130119955
    Abstract: A SEPIC converter with over-voltage protection includes a high-side inductor that connects a node Vw to a node Vx. The node Vx is connected, in turn to ground by a power MOSFET. The node Vx is also connected to a node Vy by a first capacitor. The node Vy is connected to ground by a low-side inductor. A rectifier diode further connects the node Vy and a node Vout and an output capacitor is connected between the node Vout and ground. A PWM control circuit is connected to drive the power MOSFET. An over-voltage protection MOSFET connects an input supply to the PWM control circuit and the node Vw. A comparator monitors the voltage of the input supply. If that voltage exceeds a predetermined value Vref the comparator output causes the over-voltage protection MOSFET to disconnect the node Vw and the PWM control circuit from the input supply.
    Type: Application
    Filed: January 7, 2013
    Publication date: May 16, 2013
    Applicant: Advanced Analogic Technologies Inc.
    Inventors: Richard K. Williams, Kevin D'Angelo, Charles Coles
  • Publication number: 20130099702
    Abstract: An LED driver IC for driving external strings of LEDs comprises a prefix register and a data register connected in series with each other and with the prefix and data registers in other driver ICs. The prefix and data registers of the driver ICs are connected in a daisy chain arrangement with an interface IC. The interface IC loads data identifying a functional latch into the prefix register and data defining a functional condition into the data register of each driver IC. The data in the data register is then transferred to the functional latch to control the functional condition within the LED driver IC.
    Type: Application
    Filed: January 10, 2012
    Publication date: April 25, 2013
    Applicant: ADVANCED ANALOGIC TECHNOLOGIES, INC.
    Inventors: Richard K. Williams, Kevin D'Angelo, David A. Brown