Features: ·Supply voltage range: 2.6V to 5.5V
·17V Maximum Output Voltage
·Two levels of current up to 300mA set with external resistors
·Dedicated pin to select the required level of current
·Operating frequency: 1.5MHz: PWM Controller
·Torch mode supported
·Shutdown pin with true load disconnection
·Efficiency: 90% at 100mA; 80% at 300mA
·DFN10L (3mm x 3mm) PackagePinout
Specifications
| Symbol |
Parameter |
Value |
Unit |
| VI |
DC Input Voltage to SGLGND |
-0.3 to 6 |
V |
| VSW |
Switch Voltage |
-0.3 to 20 |
V |
FB, SEL,
SHDN, LC, HC |
Voltage Range |
-0.3 to VI + 0.3 |
V |
| OVP |
Over Voltage Protection |
-0.3 to 20 |
V |
| ESD |
Human Body Model |
±2 |
kV |
| PTOT |
Continuous Power Dissipation (at TA = 70°C) |
1.5 |
mW |
| TOP |
Operating Junction Temperature Range |
-40 to 85 |
°C |
| TJ |
Junction Temperature |
-40 to 125 |
°C |
| TSTG |
Storage Temperature Range |
-65 to 150 |
°C |
Note: Absolute Maximum Ratings are those values beyond which damage to the device may occur.
Functional Operation under these conditions is not implied.
DescriptionThe STCF01 is a dedicated IC designed to drive two, three, or four white, cell phone camera flash LEDs with constant current. The step-up (boost) converter input is connected directly to the battery, and its converter output voltage is automatically determined using current feedback-based duty cycle control.
The STCF01 has a dedicated pin for two levels of LED current selection. An external resistor is used to set the required current for each level. Compared to the linear current control technique, this method allows designers to achieve the best and most efficient performance possible with the selected current, thereby avoiding linear element losses.
The Shutdown (SHDN) pin saves power when the camera flash is not used by consuming less than 0.1A of current. When the SHDN pin is high (logic '1'), the device is turned OFF and there is no DC current path from the supply to the white LEDs (Load Disconnect). If it is held to GND, the output current continuously flows through the LEDs (Torch mode). The SHDN pin, when it is set to low (logic '0'), is also used to set the flash function time duration.
STCF01 Data Sheet
