MC34716EP Freescale Semiconductor, MC34716EP Datasheet - Page 20

• Manufacturer Part Number: MC34716EP
• Description: IC CONVERTER DDR 26QFN
• Manufacturer: Freescale Semiconductor

Specifications of MC34716EP

• Applications: Converter, DDR
• Voltage - Input: 3 ~ 6 V
• Number Of Outputs: 2
• Voltage - Output: 0.7 ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 26-QFN
• Output Voltage: 0.7 V to 3.6 V
• Output Current: 5 A
• Input Voltage: 3 V to 6 V
• Switching Frequency: 1 MHz
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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