2010 AUTUMN Page 131
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TK11891
DCDC Converter, 1ch, Step-up, Inductive
DCDCコンバータ、1ch、昇圧、インダクティブ
Feature
2.0MHz operation 動作周波数 2MHz
Internal switching transistor スイッチングトランジスタ内蔵
Maximum duty cycle 90% 最大デューティーサイクル90％
Very small inductor available 小型コイル使用可能
Very small package SON3024-8 0.75mm薄型パッケージSON3024-8
Operating Voltage Range VOP=2.65 to 16V 動作電圧範囲VOP=2.65~16V
Operating Temp. Range TOP=- 30to +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
TK11891 - 2.0MHz 2 to 4 LED 100mA
Ordering Guide, Marking
Part Name Ordering Name Marking Description Order
Size
TK11891 TK11891FTL-GH AA4
LOT
TK11891: Part Name
F: SON3024-8 Package
TL: Tape&Reel, Left
-GH:
PB-Free&Halogen Fre
e
3,000
pcs.
/Reel
Block Diagram, Standard Application
3
2
1
Oscillator
Output
Drive
Control
GND OVP
EA
OUT
8
6
V
IN
Reference
Voltage
0.5V
0.6V
Error Amp
PWM Comp
7
SW
45
V
FB
Over
Current
Detector
EN PGND
Vcc
R
LED
5.6
Ω
L
4.7
μ
H
4.7
μ
FC
IN
I
LED
PGND
4
81
2
3
TK11891F
5
6
7
V
IN
GND
V
FB
E
A.OUT
SW
OVP
En
V
IN
on/off
SBD
2.2
μ
FC
OUT
0.1
μ
FC
EA
