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参数资料
| 型号： | MAX1575ETE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 5/9页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 16-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），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： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（4x4） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
White LED 1x/1.5x Charge Pump
for Main and Sub-Displays
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
—
NAME
C2P
OUT
SET
ENS
ENM
LED6
LED5
LED4
LED3
LED2
LED1
GND
C1N
IN
C2N
C1P
EP
FUNCTION
Transfer-Capacitor 2 Positive Connection. Connect a 1μF ceramic capacitor from C2P to C2N.
Output. Connect a 1μF ceramic capacitor from OUT to GND. Connect OUT to the anodes of all the LEDs.
OUT is internally pulled down with 5k Ω during shutdown.
Current-Set Input. Connect a resistor (R SET ) from SET to GND to set the maximum LED current. I LED(MAX) =
234 × 0.6V / R SET . SET is internally biased to 0.6V. SET is high impedance during shutdown.
Enable and Dimming Control for LED5 and LED6 (Sub-Display). The first time ENS goes high (50μs min),
LED5 and LED6 turn on at 100% brightness. Pulsing ENS low dims the LEDs in multiple steps. If ENS is held
low for more than 2ms (typ), LED5 and LED6 turn off. When ENM and ENS are both held low for more than
2ms (typ), the IC goes into shutdown mode. See Figure 1.
Enable and Dimming Control for LED1–LED4 (Main Display). The first time ENM goes high (50μs min),
LED1–LED4 turn on at 100% brightness. Pulsing ENM low dims the LEDs in multiple steps. If ENM is held low for
more than 2ms (typ), LED1–LED4 turn off. When ENM and ENS are both held low for more than 2ms (typ), the IC
goes into shutdown mode. See Figure 1.
Sub-Display LEDs Cathode Connection. Current flowing into LED_ is described in the ENS and SET
descriptions above. The charge pump regulates the lowest-enabled LED_ voltage to 180mV. Connect LED_
to IN if the LED is not populated. LED_ is high impedance during shutdown.
Main-Display LEDs Cathode Connection. Current flowing into LED_ is described in the ENM and SET
descriptions above. The charge pump regulates the lowest-enabled LED_ voltage to 180mV. Connect LED_
to IN if the LED is not populated. LED_ is high impedance during shutdown.
Ground. Connect GND as close as possible to system ground and to the ground of the input bypass
capacitor.
Transfer-Capacitor 1 Negative Connection. Connect a 1μF ceramic capacitor from C1P to C1N.
Supply Voltage Input. Connect a 1μF ceramic capacitor from IN to GND. The input voltage range is 2.7V to
5.5V. IN is high impedance during shutdown.
Transfer-Capacitor 2 Negative Connection. Connect a 1μF ceramic capacitor from C2P to C2N.
Transfer-Capacitor 1 Positive Connection. Connect a 1μF ceramic capacitor from C1P to C1N.
Exposed Paddle. Connect the exposed paddle to GND.
Detailed Description
The MAX1575 charge pump drives up to four white
LEDs in the main display and up to two white LEDs in
the sub-display with regulated constant current for
uniform intensity. By utilizing adaptive 1x/1.5x charge-
pump modes and very-low-dropout current regulators, it
achieves high efficiency over the 1-cell lithium-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 MAX1575 operates in
1x mode and V OUT is pulled up to V IN . The internal cur-
rent regulators regulate the LED current. As V IN drops,
V LED_ eventually falls below the switchover threshold of
100mV and the MAX1575 starts switching in 1.5x mode.
When the input voltage rises above V OUT by about 50mV,
the MAX1575 switches back to 1x mode.
Soft-Start
The MAX1575 includes soft-start circuitry to limit inrush
current at turn-on. When starting up, the output capacitor
is charged directly from the input with a ramped current
source (with no charge-pump action) until the output volt-
age approaches the input voltage. Once this occurs, the
charge pump determines if 1x or 1.5x mode is required.
In the case of 1x mode, the soft-start is terminated and
normal operation begins. During the soft-start time, the
output current is set to 5% of the maximum set by R SET .
In the case of 1.5x mode, soft-start operates until the low-
est of LED1–LED6 reaches regulation. If an overload con-
dition occurs, soft-start repeats every 2ms. If the output is
shorted to ground (or <1.25V), the part reverts to soft-
start and the ramped current source.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1575ETE/V+ | 功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump for Main and Sub-Displays 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 |
| MAX1575ETE/V+T | 功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump for Main and Sub-Displays 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 |
| MAX1575ETE+ | 功能描述:LED照明驱动器 White LED 1x/1.5x 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 |
| MAX1575ETE+T | 功能描述:LED照明驱动器 White LED 1x/1.5x 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 |
| MAX1575ETE-T | 功能描述:LED照明驱动器 White LED 1x/1.5x 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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