00W151A Intelligent three-color LED driver BU8770FV Description Dimension (Units : mm) 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. 1 8 4.4±0.2 9 0.65 0.22±0. 1 0.15±0. 1 1. 15±0.1 0. 1 6.4±0.3 5.0±0.2 16 0.3Min. 0. 1 SSOP-B16 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 Applications Cellular phones Absolute Maximum Ratings (Ta=25˚C) Parameter Symbol Limits Unit VDD 6.0 V Topr Tstg –30 ~ +80 –40 ~ +125 ˚C ˚C Power supply voltage Operating temperature range Storage temperature range ∗ Derating : 4.5mW/˚C for operation above Ta=25˚C April, 2001 Electrical characteristics (Unless otherwise noted; Ta=25˚C, VDD=3.60V, VDD3V=3.05V) Parameter Symbol Min. Typ. Max. Unit VDD 3.15 3.60 4.80 V Conditions Whole Power supply voltage (Current consumption) IDDS — 0.1 1 µA Reference voltage VDD3V 2.80 3.05 3.20 V (Current consumption) IDD3V0 — 0.1 1 µA IDD3V1 — 30 60 µA Stand-by mode ∗1 3V reference voltage Stand-by mode Normal operating mode DC/DC converter Output voltage 1.574VDD3V ± 5% VOUT Output current IOUT — — Capacitor capacitance 40 0.22 ± 20% CAP1 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 V mA ∗2 VOUT=4.8V µF µF (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 CAP1P DC_OUT DC/DC CONV. OSC CAP_O NSTBY NRST DATA CLK STRB 1/n RECEIVE BUF. VDD3V ROUT 7bit counter PWM R ADDR DEC. DRIVER GOUT PWM G DRIVER BOUT CONTROL REG. PWM B DRIVER PVSS R REG. G REG. B REG. Digital Analog VDD3V DVSS VDD AVSS 0.1µF 4.7µF