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White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
C8
1 μ F
C9
1 μ F
C1P
C1N
C2P
C2N
INPUT
2.7 TO 5.5V
IN1
C7
2.2 μ F
PGND1
NEG
C6
1 μ F
IN2
C3
1 μ F
PGND2
IN3
LED1
LED2
C5
2.2 μ F
C4
AGND
REF
MAX8821
LED3
LED4
INDIVIDUAL
0.1mA TO
25.6mA
DIMMING
0.1 μ F
LED5
LED6
CMREF
C12
0.1 μ F
LOGIC
CONTROL AND I 2 C
V DD
SDA
LDO1
LDO2
C10
2.2 μ F
C11
1 μ F
DUAL LOW-
NOISE LDO
INTERFACE
SCL
SPK+
DIFFERENTIAL
AUDIO INPUT
AIN+
AIN-
SPK-
LOUDSPEAKER/EARPIECE
EP
Figure 2. Typical Application Circuit
Detailed Description
The MAX8821 integrates a charge pump for white LED
display backlighting, an audio loudspeaker amplifier,
and dual LDO for camera functions. It includes soft-
start, thermal shutdown, open-circuit and short-circuit
protections for the white LEDs, audio amplifier, and
LDOs. Figure 1 is the block diagram, and Figure 2
shows the typical application circuit.
LED Charge Pump
The MAX8821 features an inverting charge pump and
six current regulators capable of 25.6mA each to drive
six LEDs. The current regulators are matched to within
±1% (typ), providing uniform white LED brightness for
LCD backlight applications. To maximize efficiency, the
current regulators operate with as little as 0.15V voltage
drop. Individual white LED current regulators conduct
current to GND or NEG to extend usable battery life. In
the case of mismatched forward voltage of white LEDs,
only the white LEDs requiring higher voltage are
switched to direct current to NEG instead of GND, fur-
ther raising efficiency and reducing battery current
drain. The regulation scheme is optimized to ensure
low EMI and low input ripple. The on-chip ambient tem-
perature derating function safely allows bright 25.6mA
16
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相关代理商/技术参数
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
MAX882C/D 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
MAX882C/D DIE 制造商:Maxim Integrated Products 功能描述:
MAX882CPA 功能描述:低压差稳压器 - LDO 5/3.3/AdjV 200mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
MAX882CPA+ 功能描述:低压差稳压器 - LDO 5/3.3/AdjV 200mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20