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| 00W151A Intelligent three-color LED driver BU8770FV Description BU8770FV is a smart LED driver developed for cellular phones. This driver generates high-intensity LED driving voltage by stepping up VDD in DC/DC converter with using the clock of the built-in oscillator. Each brightness of RGB color can be adjusted independently in 128 steps by PWM control. Dimension (Units : mm) 5.00.2 16 9 6.40.3 4.40.2 1. 150.1 1 8 0. 1 0.65 0.220. 1 0.3Min. 0. 1 Features 1) 128 steps PWM brightness control for each three color independently 2) DC/DC converter for LED driving 3) Low consumption stand-by circuit 4) Small SSOP-B16 package SSOP-B16 Applications Cellular phones Absolute Maximum Ratings (Ta=25C) Parameter Power supply voltage Operating temperature range Storage temperature range Derating : 4.5mW/C for operation above Ta=25C Symbol VDD Topr Tstg Limits 6.0 -30 ~ +80 -40 ~ +125 Unit V C C April, 2001 0.150. 1 Electrical characteristics (Unless otherwise noted; Ta=25C, VDD=3.60V, VDD3V=3.05V) Parameter Whole Power supply voltage (Current consumption) Reference voltage (Current consumption) DC/DC converter Output voltage Output current Capacitor capacitance VOUT IOUT CAP1 1.574VDD3V 5% -- -- 0.22 20% 40 V mA F F 2 VOUT=4.8V VDD IDDS VDD3V IDD3V0 IDD3V1 3.15 -- 2.80 -- -- 3.60 0.1 3.05 0.1 30 4.80 1 3.20 1 60 Symbol Min. Typ. Max. Unit Conditions V A V A A Stand-by mode 1 3V reference voltage Stand-by mode Normal operating mode CAP_0 4.7 20% 1 : IDDS is current consumption at the time when NSTBY=L, DATA=L, CLK=L, and NRST=H. 2 : VOUT=1.574X3.05=4.8007V when the output voltage is VDD3V=3.05 (VOUT=4.4072V when the output voltage is VDD3V=2.80V, VOUT=5.0368V when the output voltage is VDD3V=3.20V) Block Diagram CAP1 CAP1N OSC NSTBY NRST DATA CLK STRB 1/n RECEIVE BUF. 7bit counter PWM R ADDR DEC. CAP1P DC/DC CONV. DC_OUT CAP_O VDD3V ROUT DRIVER GOUT PWM G DRIVER BOUT CONTROL REG. R REG. G REG. B REG. PWM B DRIVER PVSS Digital Analog VDD3V DVSS VDD AVSS 0.1F 4.7F |
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