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| 型号： | MAX8821ETI+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 1/29页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 28-TQFN |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），切换式电容器（充电泵） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 5.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
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19-1014; Rev 0; 10/07
EVALUATION KIT
AVAILABLE
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
General Description
The MAX8821 integrates a charge pump for white
LEDs, an audio loudspeaker amplifier, and two low-
noise LDOs controlled by an I 2 C control interface. The
high-efficiency, adaptive-mode inverting charge pump
drives up to six LEDs with constant current for uniform
brightness. The LED current is controlled by an I 2 C
interface and adjusts from 0.1mA to 25.6mA per LED
into 32 pseudo-logarithmic steps. Independent volt-
ages for each LED maximize efficiency even with large
LED forward voltage (V F ) mismatch. An internal temper-
ature derating function reduces the current above
+40°C to protect the LEDs.
The high-efficiency mono Class D audio amplifier deliv-
ers up to 2W into a 4 Ω speaker from a 5V input supply.
The amplifier features proprietary filterless Active
Emissions Limiting (AEL) technology. AEL prevents
high-frequency emissions resulting from conventional
Class D free-wheeling behavior in the presence of an
inductive load. The amplifier offers two modulation
schemes: a fixed-frequency mode (FFM) and a spread-
spectrum mode (SSM) that reduce EMI-radiated emis-
sions due to the modulation frequency. The amplifier
also has robust output protection and high power-sup-
Features
? White LED Inverting Charge Pump
Independent Adaptive Current Regulators for
Each LED
6 Low-Dropout Current Regulators
Flexible I 2 C Dimming Control for Each LED
Ramp-Up/Down, Current Control for Each LED
Low 70μA (typ) Quiescent Current
T A Derating Function Protects LEDs
? Mono 2W Class D Loudspeaker Amplifier
85% Efficiency (R L = 8 Ω , P OUT = 600mW)
Low 0.05% THD+N at 1kHz
High 65dB PSRR at 1kHz
Fully Differential Inputs
-3dB to +24dB Gain Settings in 3dB Steps
Integrated Click-and-Pop Suppression
Low Quiescent Current
? Dual Low-Noise LDO
45μV RMS Output Noise, 70dB PSRR
Flexible I 2 C-Controlled Output Voltages
200mA and 300mA Output Current Drive
Ordering Information
ply rejection ratio (PSRR). Click-and-pop suppression is
active during power-up/down, enable/disable, and for
all mode changes. The amplifier’s gain is adjustable
through an I 2 C interface, from -3dB to +24dB in 10 3dB
steps. Differential inputs improve common-mode noise
PART
MAX8821ETI+
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
28 Thin QFN
4mm x 4mm
PKG
CODE
T2844-1
rejection.
The LDOs in the MAX8821 are designed for low-noise
operation. Each LDO output voltage can be individually
programmed by the I 2 C interface. Both LDO1 and
LDO2 have a high 70dB PSRR rating.
+Denotes a lead-free package.
Typical Operating Circuit
INPUT
The MAX8821 includes soft-start, thermal shutdown,
open-circuit, and short-circuit protections, and is avail-
2.7 TO 5.5V
IN1
PGND1
C1P
C1N
C2P
C2N
NEG
able in a compact 28-pin, Thin QFN, 4mm x 4mm pack-
IN2
age (0.8mm max height).
Applications
PGND2
IN3
LED1
LED2
Cell Phones and Smartphones
AGND
REF
MAX8821
LED3
LED4
INDIVIDUAL
0.1mA TO
25.6mA
DIMMING
PDAs, Digital Cameras, Camcorders
LED5
MP3 Players, GPS Devices
CMREF
LED6
LDO1
DUAL LOW
LOGIC
CONTROL AND I 2 C
INTERFACE
DIFFERENTIAL
AUDIO INPUT
V DD
SDA
SCL
AIN+
AIN-
LDO2
SPK+
SPK-
NOISE LDO
LOUDSPEAKER/
EARPIECE
EP
________________________________________________________________ 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8821ETI+ | 功能描述:LED照明驱动器 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 |
| MAX8821ETI+T | 功能描述:LED照明驱动器 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 |
| MAX8821EVKIT+ | 功能描述:电源管理IC开发工具 MAX8821 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX8822ETE+ | 功能描述:LED照明驱动器 Negative Charge Pump LED Driver 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 |
| MAX8822ETE+T | 功能描述:LED照明驱动器 Negative Charge Pump LED Driver 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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