RT9911PQV RICHTEK [Richtek Technology Corporation], RT9911PQV Datasheet - Page 23

• Manufacturer Part Number: RT9911PQV
• Description: 6 Channel DC/DC Converters
• Manufacturer: RICHTEK [Richtek Technology Corporation]

Oscillator
The internal oscillator synchronizes CH1 to CH6 with fixed
operation frequency. The frequency could be set by
connecting resistor between RT pin to GND.
to adjust frequency.
Soft Start
With internal soft start mechanism, the soft start time of
each channel is proportional to the compensation capacitor.
Refer to the soft start waveform
application.
Protection
RT9911 provides versatile protection functions. Protection
type, threshold and protection methods are summarized
in Table 1.
DS9911-04 August 2007
VDDM
CH1:
Boost
CH1:
Buck
CH2
CH3
CH6
Thermal
Note : If R
For example, if select NMOS( AOS3402), R
Over Voltage
Protection
Current Limit
Current Limit
Under Voltage
Protection
Over Voltage
Protection
Current Limit
Under Voltage
Protection
Over Voltage
Protection
Current Limit
Over Voltage
Protection
Thermal
shutdown
DS(ON)
Protection
type
x I
inductor
> 0.3V, then current limit happens.
VDDM > 6.5V
NMOS current> 2.5A
PMOS current > 2.0A
FB1 < 0.4V
FB1 > 1.0V
PMOS current > 2.0A
FB2 < 0.4V
FB2 > 1.0V
CS3 > 0.3V, see below
Note
VFB6 > 1.0V, see
Figure 8
Temperature > 180°C
Refer to Electrical spec
Threshold (typical)
in Figure 4 for
DS(ON)
See
=110mΩ (at V
Figure 5
typical
Disable all channels
NMOS latched off
PMOS latched off and all
channels shutdown
NMOS, PMOS latch off and
all channels shutdown
NMOS, PMOS latch off and
all channels shutdown
PMOS latched off and all
channels shutdown
NMOS, PMOS latch off and
all channels shutdown
NMOS, PMOS latch off and
all channels shutdown
NMOS latched off
NMOS off
All channels stop switching
Table 1
Protection methods
GS
= 2.5V), then current limt happens if I
2500
2250
2000
1750
1500
1250
1000
750
500
250
0
10
Figure 5. Adjust Frequency
Oscillator Frequency vs. R
Restart if VDDM < 6.5V
Automatic reset at next clock
cycle
VDDM power reset
VDDM power reset
VDDM power reset
VDDM power reset
VDDM power reset
VDDM power reset
Automatic reset at next clock
cycle
VFB6 < 1.0V
Temperature < 160°C
R
RT
100
(kΩ)
Reset method
inductor
RT9911
www.richtek.com
> 2.73A.
RT
1000
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