0
ACTIVE
Input voltage type |
Linear |
Topology |
Charge pump |
Vin (min) (V) |
2.7 |
Vin (max) (V) |
5.5 |
Vout (max) (V) |
5.3 |
Vout (min) (V) |
4.5 |
Iout (max) (A) |
5 |
Iq (typ) (mA) |
0.168 |
Features |
OVP |
Operating temperature range (°C) |
-30 to 85 |
Dimming method |
Analog, PWM |
Number of channels |
1 |
Rating |
Catalog |
UQFN (NHU)-20-7.5 mm² 3 x 2.5
The LM3550 device is a low-noise, switched-capacitor DC-DC converter designed to operate as a current-limited and adjustable (up to 5.3 V) super-capacitor charger. The LM3550 features user-selectable termination voltages and provides one adjustable constant current output (up to 200 mA) and one NFET controller ideal for driving one or more high-current LEDs in a high-power flash mode or a low-power torch mode.
The LED current and flash pulse duration of the LM3550 can be programmed via an I2C-compatible interface. The STROBE pin allows the flash to be toggled via a flash-enable signal from a controller or camera module. The EOC pin sinks current when the output voltage reaches 95% of the final value.
The ALD/TEMP input pin allows either a light sensor to adjust the flash-current level based on the ambient light conditions, or it allows for over-temperature detection and protection of the LED during high-power operation or high ambient-temperature conditions.
For all available packages, see the orderable addendum at the end of the data sheet.WELL LINK CHIPS GROUP CO.,LIMITED FLAT/RM 1802 BEVERLY HOUSE 93-107 LOCKHART ROAD WANCHAI HK
