Texas Instruments LM3552
The LM3551 and LM3552 are fixed frequency, current mode step-up DC/DC converters with two integrated NFETs that can be used for precision LED brightness control. The devices are capable of driving loads up to 1A from a single-cell Li-Ion battery. The LM3551 and LM3552 can drive one or more high current flash LEDs either in a high power Flash mode or a lower power Torch mode using the TORCH/FLASH pin.| Part No. | LM3552 |
|---|---|
| Datasheet | LM3552 Download |
| Manufacturer |  Texas Instruments |
| Description | 1A White LED Driver |
| Buy | Stock & Price |
FEATURES
1●2 Up to 1A Total Drive Current
● Flash Timeout Protection
● Independent Torch/Flash/Shutdown Modes
● LED Disconnect in Shutdown
● Programmable Soft-Start Limits Inrush Current
● Over-Voltage Protection
● Wide Voltage Range 2.7 to 5.5V
● 1.25MHz Constant Switching Frequency
● Small, Low Profile Package, Non-Pullback WSON(4mm x 4mm)
APPLICATIONS
● White LED Camera Flash● White LED Torch (Flashlight)
● DSC (Digital Still Camera) Flash
● Cellular Camera Phone Flash
● PDA Camera Flash
● Camcorder Torch (Flashlight) Lamp
DESCRIPTION
A programmable Timeout function on the FTO pin forces the internal NFETs to turn off after a certain user defined time. An external SD pin (LM3551) or EN pin (LM3552) is available to put the device into low power shutdown mode. During shutdown, the feedback resistors and the load are disconnected from the input to avoid leakage current paths to ground. User programmable soft-start circuitry has been integrated to eliminate large inrush currents at startup.
