l6730cqtr STMicroelectronics, l6730cqtr Datasheet - Page 16

• Manufacturer Part Number: l6730cqtr
• Description: Adjustable Step-down Controller With Synchronous Rectification
• Manufacturer: STMicroelectronics

Device description
5.6
Figure 7.
16/50
Vss
Soft start
When both V
the start-up phase takes place. Otherwise the SS pin is internally shorted to GND. At start-up, a
ramp is generated charging the external capacitor C
initial value for this current is 35µA and charges the capacitor up to 0.5V. After that it becomes
10µA until the final charge value of approximately 4V (see
V s s
Device start-up: Voltage at the SS pin.
CC
and V
IN
are above their turn-ON thresholds (V
0.5V
0.5V
0 .5 V
SS
with an internal current generator. The
Figure
4 V
IN
is monitored by the OCH pin)
7.).
1.25V
4.2V or 8.6V
1 .2 5 V
4 .2 V
V c c
V in
4V
L6730C - L6730D
Vcc
Vin
t
t