BU8770FV
BU8770FV is Intelligent three-color LED driver manufactured by LSI Computer Systems.
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)
5.0±0.2 16 9
6.4±0.3
4.4±0.2
1. 15±0.1
0. 1
0.22±0. 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=25˚C)
Parameter Power supply voltage Operating temperature range Storage temperature range
∗ Derating : 4.5m W/˚C for operation above Ta=25˚C
Symbol VDD Topr Tstg
Limits 6.0
- 30 ~ +80
- 40 ~ +125
Unit V
˚C ˚C
April, 2001
0.15±0. 1
Electrical characteristics (Unless otherwise noted; Ta=25˚C, 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 m A µF µF ∗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
µA V µA µA 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...
