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480mA White LED 1x/1.5x/2x Charge Pump for
Backlighting and Camera Flash
Table 3. Recommended Components
DESIGNATION
C IN , C OUT
C2, C3, C4
D1–D4
D5 (D5–D8)
R SETM , R SETF
VALUE
4.7μF
1μF
—
—
As required
MANUFACTURER
Murata
Murata
Nichia
Nichia
Kamaya
PART NUMBER
GRM188R60J475K
GRM155R60J105K
NSCW215T
NBCW011T
—
DESCRIPTION
4.7μF ±10%, 6.3V X5R ceramic capacitors (0603)
1μF ±10%, 6.3V X5R ceramic capacitors (0402)
White LEDs
White LEDs, four LEDs in one package
1% resistors
Typical operating waveforms shown in the Typical
Operating Characteristics show input ripple in 1x, 1.5x,
and 2x mode.
Component Selection
Pin Configuration
Use only ceramic capacitors with an X5R, X7R, or better
18
17
16
15
14
13
dielectric. See Table 3 for a list of recommended parts.
PC Board Layout and Routing
The MAX1576 is a high-frequency switched-capacitor
voltage regulator. For best circuit performance, use a
PGND 19
C1N 20
C2N 21
12
11
10
LED3
LED4
LED5
solid ground plane and place C IN , C OUT , C2, C3, and
C4 as close to the MAX1576 as possible. There should
be no vias on C IN . Connect GND1, GND2, and PGND
to the exposed paddle directly under the IC. Refer to
INP 22
C2P 23
C1P 24
+
MAX1576Y
9
8
7
LED6
GND2
LED7
the MAX1576 evaluation kit for an example.
1
2
3
4
5
6
Chip Information
TRANSISTOR COUNT: 6679
PROCESS: BiCMOS
THIN QFN
4mm x 4mm
12
______________________________________________________________________________________
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MAX1576EVKIT 功能描述:LED 照明开发工具 Evaluation Kit for the MAX1576 RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:
MAX1577YETA 制造商:Maxim Integrated Products 功能描述:1.1A WHITE LED REGULATING CHARGE PU - Rail/Tube
MAX1577YETA+ 制造商:Maxim Integrated Products 功能描述:CHG PUMP STPUP/STPDN 3.4V/4.6V/5.1V 1200MA 8TDFN EP - Rail/Tube
MAX1577YETA+T 功能描述:LED照明驱动器 1.2A White LED Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX1577YETA-T 功能描述:LED照明驱动器 1.2A White LED Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
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