The LM3595 is a parallel white-LED driver that can drive four white LEDs. It can supply a total output current of 100mA over an input voltage range of 3.0V to 5.5V. The amount of constant current sourced to the outputs is user selectable using one external sense resistor. LM3595 typically draws 0.03µA when placed in shutdown, and 200µA when operating in the no-load condition. If any of the outputs are not used, leave the pin(s) unconnected. Brightness can be controlled by both analog and PWM techniques. A voltage between 0V and 3V may be applied to the BRGT pin to vary the current. Output current will linearly track the voltage applied to the BRGT pin. An active-low level must be present on the BR-ON pin for analog brightness control to be disabled. Alternatively, a PWM signal can be applied to the EN pin to vary the perceived brightness of the LED. The LM3595 uses an active-high enable level. The LM3595 is available in National’s LLP-10 package.
The LM3595 is a parallel white‑LED driver capable of driving four white LEDs with a total output current of up to 100 mA (≈25 mA per LED). Brightness can be adjusted using an analog voltage on the BRGT pin or a PWM signal on the EN pin, while the device features an active‑high enable input and a very low shutdown current.
Designed in a leadless lead‑frame package (LLP‑10, 3.0 mm × 3.0 mm × 0.8 mm), the driver operates from a 3.0 V to 5.5 V supply and includes internal thermal protection. Typical applications include portable devices, keypad backlights, and strobe LEDs, with recommended PCB layout guidelines to ensure good thermal performance.
| Input voltage range | 3.0 V to 5.5 V |
|---|---|
| Maximum total output current | 100 mA (25 mA per LED) |
| Package | LLP‑10 3.0 mm × 3.0 mm × 0.8 mm |
| Shutdown current (typical) | 0.03 µA |
| Enable pin type | Active‑high |
| Brightness control methods | Analog voltage (BRGT) and PWM (EN) |
| Number of LED outputs | Four matched current sources |
The device operates from 3.0 V up to 5.5 V.
Brightness can be set either with an analog voltage on the BRGT pin or with a PWM signal applied to the EN pin.
In shutdown the part draws about 0.03 µA typical.
It can drive up to four white LEDs with matched current sources.