Page 130 2010 AUTUMN
TK11890A
DCDC Converter, 1ch, Step-up, Inductive
DCDCコンバータ、1ch、昇圧、インダクティブ
Feature
Built-in Three Modes 3モード調光機能、シャットダウンモード内蔵
LED Dimming and Shutdown Mode
2.0MHz High Speed Operation 高速動作周波数 2.0MHz
Internal Switching Transistor (MAX 1.0A) スイッチングトランジスタ内蔵(MAX 1.0A)
Maximum Duty Cycle 90% 最大デューティサイクル 90%
Very Small Inductor Available 小型コイル使用可能
Very Small 9 Bump Flip Chip 1.5×1.5mm, 9-bump フリップチップ
Operating Voltage Range VOP=2.65 to 8.0V 動作電圧範囲VOP=2.65~8.0V
Operating Temp. Range TOP=-30 to +85°C 動作温度範囲TOP=-30~+85°C
Power Dissipation PD=600mW 許容消費電力PD=600mW
Characteristics
Part Name Number of
Current Stabilizer
fOSC Number of LED in
serial connection
ILED Max
TK11890A - 2.0MHz 2 to 4 LED 100mA
Ordering Guide, Marking
Part Name Ordering Name Marking Description Order
Size
TK11890A TK11890AB1G0B AAG
LOT
TK11890A: Part Name
B1: WL-CSP FC-9
G0:
PB-Free
B: Tape&Reel, Back
3,000
pcs.
/Reel
Block Diagram, Standard Application
EA
OUT
V
IN
Error Amp 1
PWM Comp
SW
V
FB1
GND
Error Amp 2
SW1
SW2
CONT2
CONT1
Open
Circuit
Protection
Oscillator
B3
Output
Drive
Control
V
FB2
Over Current
Detector
Control
Circuit
Referrence
Voltage
C1
B1
A3
A1
C3
C2
GND
A2
B2
A1A2A3
B1
C1
B2B3
C3 C2
V
IN
SW GND
CONT1 CONT2
GND
EA
OUT
V
FB2
V
FB1
V
IN
C
IN
L
SBD
C
OUT
White
LED
R
LED1
R
LED2
C
EAOUT
4.7
μ
F
3.3
μ
F
MA21D3400L
(Panasonic)
1.0
μ
F
0.1
μ
F
3.3
Ω
3.3
Ω
LED Current
Control Input
I
LED
=74mA
