EVALUATION KIT AVAILABLE
MAX77387
Dual-Phase Adaptive DC-DC Step-Up Converter
With 2x 1000mA High-Side Current Regulators
General Description
Benefits and Features
The MAX77387 provides a high-efficiency solution for
smartphone camera flash applications by integrating a
dual-phase 2A PWM DC-DC step-up converter and two
programmable 1A high side, low-dropout LED current
regulators for flash and torch functions. An I2C interface
provides flexible control of the step-up converter, torch,
flash mode selection, and torch/flash safety timer dura-
tion settings.
S Input Supply of 2.5V to 5.5V with Full Functionality
S Dual-Phase Interleave Step-Up DC-DC Converter
True Shutdown Output
2A Guaranteed Output Current for V > 2.7V
IN
and V
P 4.0V
OUT
Adaptive Output Voltage Regulation to Ensure
Industry’s Highest System Efficiency
Over 90% Peak Efficiency
The IC operates down to 2.5V, making it futureproof for
new battery technologies. The step-up converter features
an internal switching MOSFET and synchronous rectifier
to improve efficiency and minimize external component
count. Dual-phase operation ensures low output ripple
and provides smallest possible solution size. The IC also
includes dual high-side high-current regulators for sup-
porting torch and flash modes. The high-current regula-
tors can source up to 1A each in flash mode and up to
250mA each in torch mode. The high-current regulators
can be combined to drive a single LED up to 2A in flash
mode and up to 500mA in torch mode. The output volt-
age can be adaptively controlled, boosting only as high
as necessary to support the required LED forward volt-
age. Adaptive mode can be used in either flash or torch
mode and works with both DAC and/or PWM dimming
control schemes. This approach reduces IC power dis-
sipation by optimizing the boost ratio and by minimizing
the losses in the current regulators.
ꢀ 3.125% Minimum Duty Cycle
ꢀ Skip Mode Capable
ꢀ On-Chip Power MOSFET and Synchronous
Rectifier
ꢀ Up to 4MHz PWM Switching Frequency per
Phase
Small 0.47FH Inductor per Phase
S High-Side Torch/Flash LED Current Regulator
I2C Programmable Flash Output Current
(15.625mA to 1000mA in 15.625mA Steps)
I2C Programmable Torch Output Current
(3.91mA to 250mA in 3.91mA Steps for Non-
PWM dimming) (125mA to 1000mA in 125mA
Steps for PWM Dimming with Programmable
Duty Cycle from 3.125% to 25% in 3.125% steps)
Low-Dropout Voltage (80mV typ) at 1000mA
S I2C-Programmable Flash Safety Timer
S I2C-Programmable Torch Safety Timer and
Optional Disabled Torch Timer
The IC includes control for external NTC, dual Tx mask,
flash strobe, and torch enable functions. This allows for
flexible control of the IC.
S Dual Independent TX_MASK Inputs for Limiting
Flash Current During Tx Events
S Open/Shorted LED Detection
S NTC Monitoring for LED Protection
S Overvoltage Protection
Additionally, the IC includes MAXFLASH 2.0 function
that adaptively reduces flash current during low battery
conditions to help prevent system undervoltage lockup.
Other features include shorted LED detection, overvolt-
age and thermal shutdown protection, and low-power
standby and shutdown modes. The IC is available in a
20-bump, 0.4mm pitch WLP package (2.1mm x 1.73mm).
S MAXFLASH 2.0 Preventing System Undervoltage
Lockup
S Thermal Shutdown Protection
S < 1µA Shutdown Current
Applications
S 20-Bump, 0.4mm Pitch 2.1mm x 1.73mm WLP
Cell Phones and Smartphones
Tablets
Ordering Information appears at end of data sheet.
Simplified Block Diagram appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maximintegrated.com/MAX77387.related.
*Patent protected PCT/US2008/075643.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6282; Rev 0; 7/12
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