MC34063ABD-TR STMicroelectronics, MC34063ABD-TR Datasheet - Page 13

• Manufacturer Part Number: MC34063ABD-TR
• Description: IC CTRL CIRCUIT DC-DC CONV 8SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck), Step-Up (Boost), Invertingr

Specifications of MC34063ABD-TR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.25 ~ 38 V
• Current - Output: 1.5A
• Frequency - Switching: 100kHz
• Voltage - Input: 3 ~ 40 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Applications: Controller, DCDC Converting
• Output Voltage: 40 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-7849-2; MC34063ABD-TR

Table 12.
Note:
t
(t
C
I
R
C
L
on
PK(switch)
on
(min)
T
SC
O
/t
Parameter
off
+ t
off
) max
Calculation
V
V
The following power supply characteristics must be chosen:
V
V
I
f
V
value will and to be increased due to its equivalent series resistance and board layout. The
ripple voltage should be kept to a low value since it will directly affect the line and load
regulation.
OUT
MIN
OUT
SAT
F
IN
RIPPLE
= Forward voltage drop of the output rectifier
= Nominal input voltage
= Minimum desired output switching frequency at the selected values of V
= Desired output current
= Saturation voltage of the output switch
= Desired output voltage, |V
V
= Desired peak to peak output ripple voltage. In practice, the calculated capacitor
(Discontinuous mode)
-----------------------------------
IN min
2I
I
------------------------------------------------
PK switch
OUT
(
out(max)
V
(
0.3/I
IN min
4.5x10
------------------------------ -
V
)
Step-Up
+
ripple p p
(
–
I
1/f
V
PK(switch)
out
V
[(t
F
min
)
sat
)
t
–
on
(
-5
on
–
V
t
/t
×
V
–
on
off
IN mi
sat
t
)
on mi
(
)+1]
(
OUT
N min
------------------------------------------------ -
| = 1.25 (1 + R
(
(Continuous mode)
I
----------------------------------------------------- -
I
---------------------------------------------------
N min
PK switch
PK switch
(
)
–
(
0.3/I
(
8V
Step-Down
V
4.5x10
V
2I
OUT
)
ripple p p
sat
–
1/f
out(max)
PK(switch)
V
min
)
–
)
+
sat
(
-5
t
V
(
V
on
t
out
on
–
F
–
2
+
/R
V
)
×
t
OU
off
1
t
)
on(
)
V
(Discontinuous mode)
-----------------------------------
IN min
2I
I
PK switch
Voltage Inverting
(
out(max)
(
0.3/I
4.5x10
------------------------------ -
V
------------------------------ -
)
V
ripple p p
V
–
I
1/f
OUT
IN
PK(switch)
out
V
[(t
min
)
sat
–
t
on
IN
(
-5
on
V
+
t
/t
×
–
sat
on
and I
off
V
t
)
F
on mi
)+1]
(
O
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