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| 型号： | MAX8678EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/13页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX8678 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 24mA |
| 输出及类型： | 4，非隔离 |
| 特点： | 可调光，带单声道 1.1W 级 AB 音频放大器 |
| 输入电压： | 2.7 ~ 5.5 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX8678 |
19-0786; Rev 0; 4/07
ATION
EVALU
AVAILA
KIT
B LE
White LED Charge Pump with
1.1W Audio Amplifier
General Description
The MAX8678 integrates a charge pump for white light-
emitting diodes (LEDs) with an audio loudspeaker
amplifier. The high-efficiency, adaptive charge pump
drives up to four LEDs with constant current for uniform
brightness. The LED current is adjustable from
0.1mA/LED to 24mA/LED in 31 pseudo-logarithmic
steps through a single-wire serial-pulse interface. High
accuracy and LED-to-LED current matching are main-
tained throughout the adjustment range. Individual
adaptive mode switching for each LED provides high
efficiency with a wide range of LED forward voltages.
The mono class AB audio amplifier directly drives an 8 Ω
loudspeaker with 1.1W RMS continuous power from a 5V
supply with less than 1% THD+N. The gain is adjustable
from -9dB to +18dB in ten 3dB steps through a single-
wire serial-pulse interface. Clicks and pops are sup-
pressed during on/off and all gain adjustments.
Differential inputs improve common-mode noise rejection.
The MAX8678 includes soft-start, thermal shutdown,
open-circuit and short-circuit protection, and is avail-
able in the 16-pin, 3mm x 3mm Thin QFN package
(0.8mm max height).
Features
? High-Efficiency White LED Charge Pump
Individual Adaptive Supply for Each LED
4 Low-Dropout LED Current Regulators
24mA to 0.1mA Dimming Range
Single-Wire, Serial-Pulse Dimming Interface
1% (typ) Accuracy
Low 140 μ A Quiescent Current
? Mono Class AB Audio Amplifier
1.1W RMS Mono BTL Output (8 Ω , V IN = 5V)
Low 0.004% THD+N at 1kHz
High 90dB PSRR at 1kHz
Fully Differential Inputs
-9dB to +18dB Gain Settings in 3dB Steps
Integrated Click/Pop Suppression
Low Quiescent Current
? Soft-Start Limits Inrush Current
? Thermal Shutdown, Open- and Short-Circuit
Protection
? 16-Pin, 3mm x 3mm Thin QFN Package
Ordering Information
Applications
Cell Phones and Smartphones
Camera Phones
PART
MAX8678ETE+
PIN-PACKAGE
16 Thin QFN
3mm x 3mm
TOP MARK
AFF
PKG CODE
T1633-5
PDAs, Digital Cameras, Camcorders
Typical Operating Circuit
+Denotes a lead-free package.
Note: The device is specified over the -40°C to +85°C extend-
ed temperature range.
INPUT
2.7V TO 5.5V
1 μ F
TOP VIEW
Pin Configuration
4.7 μ F
IN
C+
C-
LED1
LED2
BACKLIGHT
OR FLASH
12
11
10
9
GND
LED3
0.1mA TO
NEG 13
8
BIAS
LED4
24mA
LED ON/OFF
AND DIMMING
ENLED MAX8678
BIAS
0.1 μ F
C- 14
C+ 15
MAX8678
7
6
OUT-
OUT+
AMP ON/OFF
AND GAIN
DIFFERENTIAL
AUDIO
INPUT
ENAMP
A+
A-
OUT+
OUT-
LOUDSPEAKER
8 Ω
ENLED 16
+
1
2
3
4
5
ENAMP
EP
NEG
1 μ F
THIN QFN
3mm × 3mm
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
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| MAX867C/D | 功能描述:直流/直流开关转换器 Adjustable Output Single-Cell DC-DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX867ESA | 功能描述:直流/直流开关转换器 3.3/5/AdjV 1-Cell DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX867ESA+ | 功能描述:直流/直流开关转换器 3.3/5/AdjV 1-Cell DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX867ESA+T | 功能描述:直流/直流开关转换器 3.3/5/AdjV 1-Cell DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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