MC34717EP Freescale Semiconductor, MC34717EP Datasheet - Page 23

• Manufacturer Part Number: MC34717EP
• Description: IC CONVERTER DDR 26QFN
• Manufacturer: Freescale Semiconductor

Specifications of MC34717EP

• 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
• No. Of Outputs: 2
• Power Dissipation Pd: 2.03W
• No. Of Pins: 26
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

resistors will affect the accuracy of the system and must be
1% accurate resistors.
must be connected in the way shown and cannot be directly
connected to the VREFIN terminal.
EQUATIONS
• V
• V
• V
• V
• V
CO-INCIDENTAL TRACKING CIRCUIT
CONFIGURATION:
and Route the upper tap point of the divider to the VREFIN
terminal, resistors R
resistor divider must be the same ratio as the slave output’s
(V
INV- terminal, resistors R
Analog Integrated Circuit Device Data
Freescale Semiconductor
S
Figure 12. Ratiometric Tracking Circuit Connections
To achieve this tracking configuration, the master voltage
if V
Connect a three resistor divider to the master voltage (V
) feedback resistor divider, which in turn connects to the
M
REFIN
REFOUT
S
S
REFOUT
= V
= V
= V
REFOUT
BG_S
BG_M
EA
= V
Figure 13. Ratiometric Tracking Plot
Reference
V
selector
= V
+
-
BG
M
< V
(1+R
(1+R
* R
REFIN
(1+R
BG_S
4
1
VREFIN
3
3
/(R
/R
, R
/R
1
COMP
2
3
/R
4
INV
), if V
4
+R
)
, and R
1
2
) = V
and R
V
4
MASTER
)
REFOUT
M
R3
R4
5
2
C
* R
as shown in
Rs
Cs
below (Condition: R
X
4
/(R
≥ V
R
C
3
To INV- of
BG_S
+R
Vmaster
F
F
4
)*(R
Figure
R
R
2
V
+R
1
2
SLAVE
14. This
1
)/R
1
= R
C
2
,
M
O
3
)
and R
would be (R
accuracy of the system and must be 1% accurate resistors.
must be connected in the way shown and cannot be directly
connected to the VREFIN terminal.
EQUATIONS
• V
• V
• V
• V
• V
tracking is needed. VREFIN should be connected to VDDI
and the reference selection block will use the internal band
gap voltage as the error amplifier’s reference voltage.
terminal directly or through a resistor divider to get a buffered
output for use in the application. The condition here is, the
voltage applied to the VREFIN terminal is greater than V
guarantee that the reference selection block will not switch
back to the V
Figure 14. Co-incidental Tracking Circuit Connections
To achieve this tracking configuration, the master voltage
(R
Not-DDR Mode (Source Only Mode) is the case when no
A user can potentially apply a voltage to the VREFIN
M
REFIN
REFOUT
S
S
3
= V
+R
= V
2
= V
= R
4
REFOUT
BG_S
BG_M
= V
+R
Figure 15. Co-incidental Tracking Plot
EA
4
Reference
V
3
= V
selector
+ R
+R
+
-
5
BG
REFOUT
M
)*(R
(1+R
[1+(R
*(R
REFIN
4
5
(1+R
) and R
). The master’s feedback resistor divider
2
4
+R
1
+R
VREFIN
/R
3
voltage.
+R
1
1
5
COMP
2
/R
)/R
)/(R
INV
), if V
5
4
2
. All five resistors will affect the
)/R
2
V
) = V
3
MASTER
= V
+R
5
REFOUT
]
R3
R4
R5
M
4
M
+R
C
*(R
Rs
Cs
if V
X
5
4
)
TYPICAL APPLICATIONS
REFOUT
To INV- of
+R
≥ V
Vmaster
R
C
5
F
BG_S
F
)/
< V
R
R
BG_S
V
1
2
SLAVE
C
BG
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