LC410591FN Datasheet, PDF (1/11 Pages) Sanyo Semicon Device – CMOS IC Power Supply IC with Built-in White LED Charge Pump

Ordering number : ENA0089
CMOS IC
LC410591FN ^{Power Supply IC with Built-in}
White LED Charge Pump
Overview
The LC410591FN is a power supply IC for white LEDs. It incorporates a charge pump-type DC/DC converter circuit
and has four constant-current outputs. The input voltage ranges from 2.7V to 5.5V. The maximum value of the
current flowing to the LEDs can be determined by the resistance value of the external resistors. The LC410591FN can
supply a total current of 105mA for one to four white LEDs. A maximum current of 26mA can be supplied to one
white LED when driving four LEDs, and a maximum current of 35mA can be supplied to one white LED when
driving three LEDs. The IC operates at a fixed frequency of 600kHz without using an inductor, resulting in very low
EMI noise.
The LED brightness is adjusted by a PWM pulse signal to the BRGT pin. When a low level is applied for 22ms or
longer to the BRGT pin, the IC enters the shutdown mode.
This IC comes in the VQFN16 package (4mm × 4mm).
Features
• Built-in low-noise and high-efficiency CMOS charge pump
• Built-in constant-current generating circuit
• Input voltage range of 2.7V to 5.5V
• Driving of 1 to 4 white LEDs at a total current of 105mA
• Automatic switching of charge pump voltage step-up ratio (×1, ×1.5)
• ±1.5% (typ) LED to LED current matching
• Soft start for preventing rush current
• Charge pump frequency of 600kHz
• Brightness adjustment control with a PWM signal
• 1µA maximum shutdown current
Applications
• White LED display backlights
• White LED keypad backlights
• PDAs, cell phones, FPDs, and other equipment that operate with a single lithium-ion battery
Any and all SANYO Semiconductor products described or contained herein do not have specifications
that can handle applications that require extremely high levels of reliability, such as life-support systems,
aircraft's control systems, or other applications whose failure can be reasonably expected to result in
serious physical and/or material damage. Consult with your SANYO Semiconductor representative
nearest you before usingany SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor assumes no responsibility for equipment failures that result from using products
at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor
products described or contained herein.
N0106HKIM B8-9151 No.A0089-1/11