MAX8834Z
searchIcon

MAX8834Z

Adaptive Step-Up Converters with 1.5A Flash Driver

Show More showmore-icon

1.5A White LED Flash Driver is Ideal for 5 Megapixel Camera Applications in Cell Phones

Part Details
Features
  • 2.5V to 5.5V Operation Range
  • Step-Up DC-DC Converter
    • 1.5A Guaranteed Output Current
    • Adaptive or I²C Programmable Output Voltage
    • 2MHz and 4MHz Switching Frequency Options
  • Two Flash/Movie LED Current Regulators
    • I²C Programmable Flash and Movie Current
    • Low-Dropout Voltage (110mV max) at 500mA
  • LED Indicator Current Regulator
    • I²C Programmable Output Current
    • Ramp and Blink Timers for Indicator Mode
    • Low-Dropout Voltage (130mV max) at 16mA
  • I²C Programmable Safety and Watchdog Timers
  • GSM Blank Logic Input
  • MAXFLASH System Lockup Protection
  • Remote Temperature Sensor Input
  • Open/Short LED Detection
  • Thermal Shutdown Protection
  • < 1µA Shutdown Current
  • 20-Bump, 0.5mm Pitch, 2.5mm x 2.0mm WLP
Additional Details
show more Icon

The MAX8834Y/MAX8834Z flash drivers integrate a 1.5A PWM DC-DC step-up converter and three programmable low-side, low-dropout LED current regulators. The step-up converter features an internal switching MOSFET and synchronous rectifier to improve efficiency and minimize external component count. An I²C interface provides flexible control of stepup converter output voltage setting, movie/flash mode selection, flash timer duration settings, and current regulator settings. The MAX8834Y/MAX8834Z operate down to 2.5V, making them future proof for new battery technologies.

The MAX8834Y/MAX8834Z consist of two current regulators for the flash/movie mode. Each current regulator can sink 750mA in flash mode and 125mA in movie mode. The MAX8834Y/MAX8834Z also integrate a 16mA low-current regulator that can be used to indicate camera status. The indicator current regulator includes programmable ramp and blink timer settings. A programmable input current limit, invoked using the GSMB control, reduces the total current drawn from the battery during PA transmit events. This ensures the flash current is set to the maximum possible for any given operating condition. Additionally, the MAX8834Y/MAX8834Z include a MAXFLASH function that adaptively reduces flash current during low battery conditions to help prevent system undervoltage lockup.

Other features include an optional NTC input for finger-burn protection and open/short LED detection. The MAX8834Y switches at 2MHz, providing best overall efficiency. The MAX8834Z switches at 4MHz, providing smallest overall solution size. The MAX8834Y/MAX8834Z are available in a 20-bump, 0.5mm pitch WLP package (2.5mm x 2.0mm).

Applications

  • Cell Phones and Smart Phones
  • PDAs, Digital Cameras, and Camcorders

close icon
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX8834YEVKIT

Evaluation Kit for the MAX8834Y/MAX8834Z

zoom

MAX8834YEVKIT

Evaluation Kit for the MAX8834Y/MAX8834Z

Evaluation Kit for the MAX8834Y/MAX8834Z

Features and Benefits

  • 2.5V to 5.5V Operation Range
  • Step-Up DC-DC Converter
    • 1.5A Guaranteed Output Current
    • Adaptive or I²C-Programmable Output Voltage (3.7V to 5.2V in 16 Steps)
    • Over 90% Efficiency
    • On-Chip Power MOSFET and Synchronous Rectifier
    • Fixed 2MHz and 4MHz PWM Switching-Frequency Option
    • Small 1µH to 4.7µH Inductor
  • Two Flash/Movie LED Current Regulators
    • I²C-Programmable Flash Output Current (22.44mA to 750mA in 32 Steps)
    • I²C-Programmable Movie Output Current (15.6mA to 125mA in 8 Steps)
    • Low-Dropout Voltage (100mV typ) at 500mA
  • LED Indicator Current Regulator
    • I²C-Programmable Output Current (0.5mA to 16mA in 32 Steps)
    • Ramp and Blink Timers for Indicator Mode
    • Low-Dropout Voltage (75mV typ) at 16mA
  • I²C and/or LED_EN ON/OFF Control for LED Current Regulators
  • I²C-Programmable Flash Safety Timer (50ms to 800ms in 50ms Steps)
  • I²C-Programmable Watchdog Timer (4s to 16s in 4 Steps)
  • MAXQ2000 Command Module for the I²C Control
  • GSM Blank Logic Input Reduces Peak Battery Current
  • Low-Battery Detection (MAXFLASH)
  • Remote Temperature Sensor Input Prevents Finger Burn or Fire
  • Open/Short LED Detection
  • Thermal-Shutdown Protection
  • < 1µA Shutdown Current
  • Tiny External Components
  • 20-Bump, 0.5mm Pitch, 2.5mm x 2mm WLP Package
  • Lead(Pb)-Free and RoHS Compliant
  • Fully Assembled and Tested

Product Detail

The MAX8834Y evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the highly integrated MAX8834Y adaptive step-up converter with 1.5A flash driver. The MAX8834Y flash driver integrates an adaptive 1.5A PWM step-up DC-DC converter, two 750mA white LED camera flash/movie current regulators, and a 16mA indicator LED current regulator. The EV kit includes a MAXQ2000 microcontroller command module that provides the I²C interface to control individual output on/off, the step-up output voltage, movie/flash current, and flash timer duration settings.

The MAX8834Y evaluation software can be downloaded from www.maximintegrated.com/evkitsoftware. The MAX8834Y EV kit can also evaluate the MAX8834Z. To evaluate the MAX8834Z, order a free sample along with the MAX8834Y EV kit.

Applications

  • Cell Phones and Smart Phones
  • PDAs, Digital Cameras, and Camcorders

Recently Viewed