STCF01 Datasheet, PDF (4/16 Pages) STMicroelectronics – Step-up Converter for Cell Phone Camera Flash LEDs

2 Pin Configuration
2 Pin Configuration
Figure 2. Pin Connnections (Top View )
STCF01
Table 1. Pin Description
PlN N°
1
2
3
4
5
6
7
8
9
10
SYMBOL
PWRGND
OVP
V_I
HC
LC
SGLGND
FB
SEL
SHDN
SW
NOTE
This is the application power signal reference. Connect the input and output capacitors to
this pin.
This pin senses step-up output voltage, which provides overvoltage protection in the event
that the output voltage exceeds the OVP threshold
This pin supplies the input voltage for the step-up stage as well as the supply voltage for the
overall device.
This pin sets the high level current for the white LEDs with a resistor that is connected
between this pin and V_I.
This pin sets the low level current for the white LEDs with a resistor that is connected
between this pin and V_I.
This pin is the logic signal reference for the IC.
This pin senses the current flowing through the white LEDs and uses this feedback to
provide current regulation.
This pin is used to select the signal level of the white LEDs; a low level signal sets the low
level LED current, while the high level signal sets the high level LED current.
This pin enables or disables the Shutdown mode. A high level signal enables device
Shutdown mode, where most of the device internal logic is turned OFF. If this pin is held to
GND, the output current flows through the LEDs continuously (Torch mode).
This is the switch node pin, which is connected to the internal N-channel MOSFET drain.
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