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昇圧、降圧、昇降圧の3つのトポロジーをサポートしたLED ドライバー
The LTM8042 and LTM8042-1 are LED drivers from Analog Devices, Inc. that come in three topologies: boost, buck, and buck-boost.
Analog dimming and PWM dimming capabilities make it ideal for lighting as well as industrial illumination, backlight displays, scanners, and automotive lighting applications.
In this article, we will explain the three major features of the LTM8042 and LTM8042-1.
- Dimmable from ultra-low brightness
- Drive up to 8 White LEDs Simultaneously to Ensure Required Brightness
- Only 9mmx15mm size, high power but space saving
1. Dimmable from ultra-low brightness
When using the PWM function, 3000:1 dimming is possible. This allows dimming from ultra-low brightness, making it applicable to a wide range of applications.
In addition, you can also perform 10:1 dimming by using the analog dimming function. Dimming is possible by adjusting the analog voltage to the dedicated CTL pin.
2. Drive up to 8 white LEDs simultaneously to ensure the required brightness
Capable of delivering up to 1A of current, the LTM8042 can drive up to 8 white and 9 red LEDs. (350mA for LTM8042-1)
Suitable for applications such as lighting where brightness is required.
| Number of white LED drives | LED current | 12 VIN | 24 VIN |
| 6 | 1A | LTM8042 | - |
| 7 | 350mA | LTM8042-1 | - |
| 8 | 1A | - | LTM8042 |
| 9 | 350mA | - | LTM8042-1 |
3. Only 9mmx15mm size, high power but space saving
The LTM8042 and LTM8042-1 are 9mm x 15mm LGA packages. It is also very compact with a height of only 2.82mm.
Therefore, it contributes to the miniaturization and thinning of LED lighting.
"DC1511A" demo board for immediate evaluation
Analog Devices offers the LTM8042, LTM8042-1 evaluation board DC1511A (DC1511A-A for LTM8042, DC1511A-B for LTM8042-1).
With this evaluation board, you can immediately start evaluating the LTM8042, LTM8042-1. The procedure is as follows.
1. Connect the LED
Connect the LEDs as shown below.
2. With power off, connect input power.
Connect to BSTIN/BKLED and GND terminals to preset the DC input voltage. (See table below for recommended input voltage range)
| DC1511A-A LTM8042 | DC1511A-B LTM8042-1 | ||
| INPUT VOLTAGE (BSTIN/BKLED-TO GND) |
LED STRING VOLTAGE (LED + TO GND) |
INPUT VOLTAGE (BSTIN/BKLED-TO GND) |
LED STRING VOLTAGE (LED + TO GND) |
| 5V to 5.8V | 6V to 9V | 3.2V to 7V | 8V to 12V |
| 6.4V to 7.7V | 8V to 12V | 4.1V to 10V | 12V to 16V |
| 8.6V to 11.3V | 12V to 16V | 4.8V to 12.3V | 15V to 21V |
| 11.3V to 13.8V | 15V to 21V | 5.8V to 15V | 18V to 24V |
| 13.4V to 16.5V | 18V to 24V | 8.5V to 20.8V | 24V to 32V |
| 20.5V to 22.5V | 24V to 32V | - | - |
3. Connect PWM pin
If PWM is not used, connect PWM to a 5V source or input voltage.
4. Turn on input power and start evaluation
For PWM dimming, PWM 100Hz or higher is required. Dimming can be achieved by changing the duty cycle of the PWM signal.
Application example
- display backlight
- Automotive and avionics lighting
- illumination
- scanner
Product Summary
| Type name | LTM8042/LTM8042-1 |
| specification |
|
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