MCP1602-ADJI/MF Microchip Technology, MCP1602-ADJI/MF Datasheet - Page 15

• Manufacturer Part Number: MCP1602-ADJI/MF
• Description: IC,SMPS CONTROLLER,VOLTAGE-MODE,LLCC,8PIN,PLASTIC
• Manufacturer: Microchip Technology
• Type: Step-Down (Buck)r

Specifications of MCP1602-ADJI/MF

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 4.5 V
• Current - Output: 500mA
• Frequency - Switching: 2MHz
• Voltage - Input: 2.7 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-DFN
• Output Voltage: 0.8 V to 4.5 V
• Output Current: 500 mA
• Input Voltage: 2.7 V to 5.5 V
• Switching Frequency: 2 MHz
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 90 %
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Table 5-1
capacitor value.
TABLE 5-1:
5.6
For most applications an inductor value of 4.7 µH is
recommended to achieve a good balance between
converter load transient response and minimized
noise. There are many different magnetic core
materials and package options to select from. That
decision is based on size, cost, and acceptable
radiated energy levels. Toroid and shielded ferrite pot
cores will have low radiated energy, but tend to be
larger and higher in cost.
The value of inductance is selected to achieve a
desired amount of ripple current. It is reasonable to
assume a ripple current that is 20% of the maximum
load current. The larger the amount of ripple current
allowed, the larger the output capacitor value becomes
to meet ripple voltage specifications. The inductor
ripple current can be calculated according to
Equation
EQUATION 5-4:
When considering inductor ratings, the maximum DC
current rating of the inductor should be at least equal to
the maximum load current, plus one half the peak-to-
peak inductor ripple current (1/2 * ΔI
resistance adds to the total converter power loss. An
inductor with a low DC resistance allows for higher
converter efficiency.
TABLE 5-2:
© 2007 Microchip Technology Inc.
Coiltronics®
Where:
Number
SD10
SD10
SD10
SD12
SD12
SD12
Part
Maximum
Minimum
F
SW
ΔI
Inductor Selection
5-4.
contains the recommend range for the output
L
=
Value
=
(µH)
3.3
4.7
6.2
3.3
4.7
6.2
------------------ -
F
CAPACITOR VALUE RANGE
MCP1602 RECOMMENDED
INDUCTORS
V
SW
Switching Frequency
OUT
(max)
0.108
0.154
0.218
0.104
0.170
0.118
4.7 µF
×
DCR
C
Ω
—
L
IN
×
⎛
⎝
1.31
1.08
0.92
1.42
1.29
1.08
I
1
(A)
SAT
–
L
). The inductor DC
V
------------ -
V
OUT
WxLxH (mm)
IN
5.2x5.2x1.0
5.2x5.2x1.0
5.2x5.2x1.0
5.2x5.2x1.2
5.2x5.2x1.2
5.2x5.2x1.2
4.7 µF
22 µF
C
⎞
⎠
Size
OUT
TABLE 5-2:
5.7
The MCP1602 is available in two different packages
(MSOP and 3x3 DFN). By calculating the power
dissipation
resistance, (θ
estimated.
temperature rating for the MCP1602 is +125
To quickly estimate the internal power dissipation for
the switching buck regulator, an empirical calculation
using measured efficiency can be used. Given the
measured efficiency, the internal power dissipation is
estimated by:
EQUATION 5-5:
The difference between the first term, input power
dissipation, and the second term, power delivered, is
the internal power dissipation. This is an estimate
assuming that most of the power lost is internal to the
MCP1602. There is some percentage of power lost in
the buck inductor, with very little loss in the input and
output capacitors.
Wurth Elektronik®
WE-TPC
WE-TPC
WE-TPC
WE-TPC
WE-TPC
WE-TPC
Number
⎛
⎝
Type M
Type M
Type M
Type S
Type S
Type S
V
------------------------------ -
Part
Efficiency
OUT
Thermal Calculations
×
and
The
I
JA
Value
OUT
(µH)
3.6
4.7
6.8
3.3
4.7
6.8
),
MCP1602 RECOMMENDED
INDUCTORS (CONTINUED)
applying
⎞
⎠
the
maximum
–
(max)
0.085
0.105
0.156
0.065
0.082
0.100
(
DCR
V
Ω
junction
OUT
MCP1602
the
1.10
0.90
0.75
1.80
1.65
1.25
I
×
continuous
(A)
SAT
I
package
OUT
DS22061A-page 15
temperature
WxLxH (mm)
3.8x3.8x1.65
3.8x3.8x1.65
3.8x3.8x1.65
4.8x4.8x1.8
4.8x4.8x1.8
4.8x4.8x1.8
)
=
Size
o
C.
junction
P
thermal
Dis
is