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参数资料
| 型号： | MAX1576ETG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 24-TQFN |
| 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），PWM，切换式电容器（充电泵） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
480mA White LED 1x/1.5x/2x Charge Pump for
Backlighting and Camera Flash
Pin Description (continued)
PIN
18
19
20
21
22
23
24
—
NAME
IN
PGND
C1N
C2N
INP
C2P
C1P
EP
FUNCTION
Supply Voltage Input. Bypass to ground with a 1μF ceramic capacitor. The input voltage range is 2.7V to
5.5V. IN is high impedance during shutdown.
Power Ground. Connect PGND to system ground. PGND is used for charge-pump switching currents.
Transfer Capacitor 1 Negative Connection. Connect to a 1μF ceramic capacitor between C1P and C1N.
C1N is internally shorted to IN during shutdown.
Transfer Capacitor 2 Negative Connection. Connect to a 1μF ceramic capacitor between C2P and C2N.
C2N is internally shorted to IN during shutdown.
Supply Voltage Input. Bypass to PGND with a 4.7μF ceramic capacitor. The input voltage range is 2.7V to
5.5V. INP is high impedance during shutdown.
Transfer Capacitor 2 Positive Connection. Connect a 1μF ceramic capacitor from C2P to C2N. During
shutdown, if OUT > IN, C2P is shorted to OUT, and if OUT < IN, C2P is shorted to IN.
Transfer Capacitor 1 Positive Connection. Connect a 1μF ceramic capacitor from C1P to C1N. During
shutdown, if OUT > IN, C1P is shorted to OUT, and if OUT < IN, C1P is shorted to IN.
Exposed Paddle. Connect the exposed paddle to ground. Connect PGND, GND1, and GND2 to the
exposed paddle directly under the IC.
Detailed Description
The MAX1576 charge pump drives up to four white
LEDs in the main display for backlighting and up to four
white LEDs for flash with regulated constant current for
uniform intensity. By utilizing adaptive 1x/1.5x/2x
charge-pump modes and very-low-dropout current reg-
ulators, it achieves high efficiency over the 1-cell lithi-
um-battery input voltage range. 1MHz fixed-frequency
switching allows for tiny external components and low
input ripple.
1x to 1.5x Switchover
When V IN is higher than V OUT , the MAX1576 operates
in 1x mode and V OUT is pulled up to V IN . The internal
current regulators regulate the LED current. As V IN
drops, V LED_ eventually falls below the switchover
threshold of 100mV and the MAX1576 starts switching
in 1.5x mode. When the input voltage rises above V OUT
by approximately 50mV, the MAX1576 switches back to
1x mode.
1.5x to 2x Switchover
When V IN is less than V OUT but greater than two-thirds
V OUT , the MAX1576 operates in 1.5x mode. The inter-
nal current regulators regulate the LED current. As V IN
drops, V LED_ eventually falls below the switchover
threshold of 100mV, and the MAX1576 starts switching
in 2x mode. When the input voltage rises above two-
thirds V OUT by approximately 50mV, the MAX1576
switches back to 1.5x mode.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
Soft-Start
The MAX1576 includes soft-start circuitry to limit inrush
current at turn-on. Once the input voltage is applied,
the output capacitor is charged directly from the input
with a ramped current source (with no charge-pump
action) until the output voltage approaches the input
voltage. Once this occurs, the charge pump deter-
mines if 1x, 1.5x, or 2x mode is required. In the case of
1x mode, the soft-start is terminated and normal opera-
tion begins. In the case of 1.5x or 2x mode, soft-start
operates until the lowest of LED1–LED4 reaches regu-
lation. If the output is shorted to ground or is pulled less
than 1.25V, the output current is limited by soft-start.
True Shutdown? Mode
When ENM1, ENM2, ENF1, and ENF2 are simultaneously
held low, the MAX1576 is shut down after a 0.5ms shut-
down delay and the input is isolated from the output. OUT
is internally pulled to GND with 5k Ω during shutdown.
Thermal Shutdown
The MAX1576 includes a thermal-limit circuit that shuts
down the IC at approximately +160°C. Turn-on occurs
after the IC cools by approximately 20°C.
Applications Information
Setting the Main Output Current
SETM controls LED1–LED4 bias current. Current flow-
ing into LED1, LED2, LED3, and LED4 is a multiple of
the current flowing out of SETM.
I LED1 = I LED2 = I LED3 = I LED4 = K x (0.604V / R SETM )
_______________________________________________________________________________________
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| MAX1576ETG+ | 功能描述:LED照明驱动器 White LED 1/1.5/2x 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 |
| MAX1576ETG+T | 功能描述:LED照明驱动器 White LED 1/1.5/2x 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 |
| MAX1576ETG-T | 功能描述:LED照明驱动器 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 |
| 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 |
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