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Toshiba |
TB62777FNG/FG
TOSHIBA Bi-CMOS Integrated Circuit Silicon Monolithic
TB62777FNG, TB62777FG
8-Channel Constant-Current LED Driver of the 3.3-V and 5-V Power Supply Voltage
Operation
The TB62777FNG/FG is comprised of constant-current drivers
designed for LEDs and LED panel displays.
The regulated current sources are designed to provide a
constant current, which is adjustable through one external
resistor.
The TB62777FNG/FG incorporates eight channels of shift
registers, latches, AND gates and constant-current outputs.
Fabricated using the Bi-CMOS process, the TB62777FNG/FG is
capable of high-speed data transfers.
The TB62777FNG/FG is RoHS.
TB62777FNG
TB62777FG
Features
• Power supply voltages: VDD = 3.3 V/5 V
• Output drive capability and output count: 50 mA × 8 channels
• Constant-current output range: 5 to 40 mA
• Voltage applied to constant-current output terminals: 0.4 V
(min, IOUT = 5 to 40 mA)
• Designed for common-anode LEDs
• Thermal shutdown (TSD)(min: 150℃)
• Power on reset (POR)
• Logical input signal voltage level: 3.3-V and 5-V CMOS
interfaces (Schmitt trigger input)
• Maximum output voltage: 25V
• Serial data transfer rate: 25 MHz (max) @cascade connection
• Operating temperature range: Topr = −40 to 85°C
• Package: SSOP16-P-225-0.65B/ SSOP16-P-225-1.00A
• Constant-current accuracy
Weight: SSOP16-P-225-0.65B 0.07 g (typ.)
SSOP16-P-225-1.00A 0.14 g
(typ.)
Output Voltage
0.4 V to 4 V
Current accuracy Current Accuracy
Between Channels Between ICs
±3%
±6%
Output Current
15 mA
1 2010-03-08
Pin Assignment (top view)
GND
SERIAL-IN
CLOCK
LATCH
OUT0
OUT1
OUT2
OUT3
VDD
R-EXT
SERIAL-OUT
ENABLE
OUT7
OUT6
OUT5
OUT4
Block Diagram
R-EXT
I-REG
OUT0
OUT1
TSD
ENABLE
LATCH
Q
ST R D
Q
ST R D
TB62777FNG/FG
OUT7
POR
VDD
Q
ST R D
GND
SERIAL-IN
CLOCK
D0 Q0
Q1 Q7
8-bit shift register
D0 to D7
R
DQ
CK R
SERIAL-OUT
Truth Table
CLOCK
LATCH
ENABLE
SERIAL-IN
OUT0 … OUT5 … OUT7
H L Dn Dn … Dn − 5 … Dn − 7
L L Dn + 1
No Change
H
L
Dn + 2
Dn + 2 … Dn − 3 … Dn − 5
X H Dn + 3
OFF
X H Dn + 3
OFF
Note 1: OUT0 to OUT7 = On when Dn = H; OUT0 to OUT7 = Off when Dn = L.
2
SERIAL-OUT
No change
No change
No change
No change
Dn -4
2010-03-08
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