ETC BU8770FV

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