POWER&RF
Step-up DC-DC converter
昇圧型DC-DCコンバータIC
TK11880FTL-G
(SON3024-8)
DESCRIPTION
The TK11880FTL-G is a step-up DC-DC converter designed
for White LED driver applications, using constant frequency
PWM architecture, with the following built in: a very high
current switching transistor 0.6A peak), a high speed
oscillator (1.0MHz), a switch over current detector, a low
voltage reference (VRef=0.495V), an error amplifier, a PWM
comparator, a zener diode for open-circuit protection and
ON/OFF control.
TK11880FTL-G can drive up to six White LEDs in series.
This IC works with a very wide operation supply range
(2.65V~10V) and the adjustable output voltage can be set as
high as 24.5V. The white LEDs are connected in series and
driven at a constant current, resulting in uniform brightness
and high efficiency. The reference voltage is a very low
0.495V, achieving high efficiency operation with the constant
current output. The ON/OFF control is built-in and the circuit
current can be decreased when the EN pin is low (shutdown
mode). The built-in zener diode can be used for open-circuit
protection in case the output load is disconnected, such as
the string of LEDs opened. The internal zener diode reduces
the external component count.
The TK11880FTL-G can also be used in other applications
as a step-up DC-DC converter.
The TK11880FTL-G is available in the SON3024-8 surface
mount package.
TK11880FTL-Gは�½色LEDをドライブするために開発した、
PWM方式昇圧型DC-DCコンバータICです。直列に接続され
た最大6個の�½色LEDをドライブ出来ます。�½色LED直列接
続、定電流駆動構成で、輝度ムラが少なく、高効率で動�½�し
ます。基準電圧は0.5Vと�½�く、定電流出力で高効率です。そ
の他、一般的な昇圧型DC-DCコンバータとしても�½�用可�½
です。
FEATURES
Very wide operating voltage range (2.65 to 10V)
1.0MHz operation
Internal switching transistor
Maximum duty cycle 93%
24.5v
MAX
output
Very small inductor available
Very small package SON3024-8
動�½�電圧範囲
2.65 to 10V
動�½�周波数
1MHz
スイッチングトランジスタ内蔵
最大デューティーサイクル
93％
最大出力電圧24.5V
小型コイル�½�用可�½
0.75mm薄型パッケージSON3024-8
ABSOLUTE MAXIMUM RATINGS
Parameter
Operating voltage range
Operating temperature range
Power dissipation
Operating frequency range
項目Symbol 記号Rating
定格
V
OP
2.65 to 10.0
動�½�電圧範囲
T
OP
-30 to +85
動�½�温度範囲
許容消費電力
P
D
600
動�½�周波数範囲
f
OP
1.0
Unit
単�½�
Remarks
備考
V
°C
mW
MHz
*Board mounted
基板実装時
ELECTRICAL CHARCTERISTICS
V
IN
=3V, T
A
=25
°
C
Parameter
項目Symbol 記号
MIN.
Value
Unit
TYP. MAX.
単�½�
Conditions
条件
Oscillator section
発振器部
f
0.7
1.0
1.3
Operating frequency
動�½�周波数
Error amplifier section (V
fb
pin, Ea
out
pin)
エラーアンプ部
(V
FB
端子,
EA
OUT
端子)
MHz
2005 FALL
TOKO [ TOKO, INC ]
