ISL97632

LED Driver with 1-Wire Dimming

Product Status: 量産中

OVERVIEW

The ISL97632 represents an efficient and highly integrated PWM boost LED driver that is suitable for 1.8" to 3.5" LCDs that employ 2 to 7 white LEDs for backlighting. With integrated Schottky diode, OVP, and dynamic digital dimming capability, the ISL97632 provides a simple, reliable, and flexible solution to the backlight designers.

The ISL97632 features a simple 1-Wire digital interface that provides a 5-bit dimming control. The dimming signal adjusts the FB voltage and therefore the LED brightness in a DC manner in 32 linear steps. An EN pin can be used to provide a zero brightness setting or shutdown power saving function.

The ISL97632 is available in the 8 Ld TDFN (2mmx3mm) package. There are 14V, 18V, and 26V OVP options that are suitable for 3, 4, and 7 LEDs (3.5V/20mA type) backlight applications respectively. The ISL97632 is specified for operation over the -40°C to +85°C ambient temperature at input voltage from 2.4V to 5.5V.

KEY FEATURES

  • 1-Wire 5-Bit Digital Dimming
  • Drives Up to 7 LEDs in Series (3.5V/20mA type)
  • OVP (14V, 18V and 26V for 3, 4, and 7 LEDs applications)
  • Integrated Schottky Diode
  • 2.4V to 5.5V input
  • 86% Efficiency
  • 1.4MHz Switching Frequency Allows Small LC
  • Enable for Shutdown Function or Zero Brightness Setting
  • 1µA Shutdown Current
  • Internally Compensated
  • 8 Ld TDFN (2mmx3mm)
  • Pb-Free (RoHS Compliant)

PARAMETRICS

Parameters
ISL97632
Basic Information
Production Status
量産中
チャネル当たりのデバイス数
1
DC/DC照明用全電流 (mA)
40
出力電流/チャネル (mA) (max)
40
出力電圧 (V) (max)
27
輝度調節
Digital 5-Bit Dimming
バス/出力インタフェース
Single Wire
入力電圧 (V) (max)
5.5
入力電圧 (V) (min)
2.4
LCD用バックライトサイズ (インチ) (min)
1.8
LCD用バックライトサイズ (インチ) (max)
3.5
認定レベル
Standard
ピーク効率 (%)
86
LED数 (max)
7
周波数
1.4 MHz
IS (max)
1.5 mA
IQ (max)
1 µA
ISW (mA) (Typ.)
470
集積ダイオード
Yes
過電圧保護
Yes
故障スイッチ
Yes
トポロジ
Inductor Boost
入力電圧範囲 (V)
2.4 to 5.5
LCD用バックライトサイズ
1.8 to 3.5
CANサンプル
YES
温度範囲
-40 to +85

ブロック図

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