SI9137 Vishay, SI9137 Datasheet - Page 9

• Manufacturer Part Number: SI9137
• Description: Multi-output, Sequence Selectable Power-supply Controller For Mobile Applications
• Manufacturer: Vishay

Document Number: 70874
S-40808—Rev. C, 26-Apr-04
TIMING DIAGRAMS
(Sysmon EN)
(Sysmon EN)
RUN/STOP
RUN/STOP
f
OSC EN
max
f
OSC EN
max
V
OSC
(SS)
V
OSC
REF
(SS)
V
DH
REF
D
V
V
DH
DL
IN
V
L
L
IN
L
2.4 V
t
BBM
FIGURE 2. Converter is Enabled Before V
FIGURE 3. Converter is Enabled After V
2.4 V
4 ms
4 ms
IN
IN
is Applied
is Applied
The converter is enabled
V
LDO is activated after V
applied
REF circuit is activated after V
becomes available
After V
the converter is turned on
Oscillator is activated
Slow soft-start gradually increases
the maximum inductor current
High-side gate drive duty ratio
gradually increases to maximum
Low-side gate drive
The converter is enabled
V
LDO is activated after V
applied
REF circuit is activated after V
becomes available
After V
the converter is turned on
Oscillator is activated
Slow soft-start gradually increases
the maximum inductor current
IN
IN
is applied
is applied
Vishay Siliconix
REF
REF
goes above 2.4 V,
goes above 2.4 V,
IN
IN
www.vishay.com
Si9137
is
is
L
L
9