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TYPICAL APPLICATIONS
CONFIGURING THE OUTPUT VOLTAGE:
Channel 1 of the 34716 is a general purpose DC-DC
converter, the resistor divider to the -INV1 node is
responsible for setting the output voltage, according to the
following equation:
680
733
787
840
0.936 - 1.092
0.781 - 0.936
0.625 - 0.780
0.469 - 0.624
? V REF ?
? 1 ?
V OUT
? R 1
? R 2
?
?
893
947
0.313 - 0.468
0.157 - 0.312
1000
0.000 - 0.156
Where V REF is the internal V BG =0.7 V.
Channel 2 is a DDR specific voltage power supply, and the
output voltage is given by the equation:
Table 5. Frequency Selection Table
SOFT START ADJUSTMENT
Table 6 shows the voltage that should be applied to the
V TT ?
V REFIN
2
ILIM1 pin to get the desired desired sort start timing on
channel 1 only.
Where V REFIN is equal to V DDQ .
SWITCHING FREQUENCY CONFIGURATION
The switching frequency will have a value of 1.0 MHz by
connecting the FREQ pin to the GND. If the smallest
frequency value of 200 kHz is desired, then connect the
SOFT START [MS]
3.2
1.6
0.8
0.4
VOLTAGE APPLIED TO ILIM
1.19 - 1.49 V
1.50 - 1.81 V
1.82 - 2.13 V
2.14 - 2.50 V
FREQ pin to VDDI. To program the switching frequency to
another value, an external resistor divider will be connected
to the FREQ pin to achieve the voltages given by Table 5 .
Table 6. Soft Start Configurations
FREQUENCY
VOLTAGE APPLIED TO PIN FREQ
200
253
2.341 – 2.500
2.185 - 2.340
R FQH
VDDI
307
360
2.029 - 2.184
1.873 - 2.028
C VDDI
R IH
R IL
R FQL
FREQ
ILIM1
413
466
520
573
627
1.717 – 1.872
1.561 – 1.716
1.405 - 1.560
1.249 - 1.404
1.093 - 1.248
GND
Figure 11. Resistor Divider for Frequency and Soft Start
Adjustment
34716
Analog Integrated Circuit Device Data ?
20
Freescale Semiconductor
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