MCP1603-ADJI/MC Microchip Technology, MCP1603-ADJI/MC Datasheet - Page 15

• Manufacturer Part Number: MCP1603-ADJI/MC
• Description: IC SYNC BUCK REG .5A ADJ 8-DFN
• Manufacturer: Microchip Technology
• Type: Step-Down (Buck)r

Specifications of MCP1603-ADJI/MC

• Package / Case: 8-DFN
• 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
• 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): 100 %
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP1603RD-TNY - REFERENCE DESIGN FOR MCP1603MCP1603EV - BOARD EVAL BUCK CONV MCP1603
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Table 5-1
capacitor value.
TABLE 5-1:
5.6
When using the MCP1603, the inductance value can
range from 3.3 µH to 10 µH. An inductance value of
4.7 µH is recommended to achieve a good balance
between converter load transient response and mini-
mized noise.
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 the follow-
ing 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.
© 2007 Microchip Technology Inc.
Where:
Maximum
Minimum
F
ΔI
Inductor Selection
SW
contains the recommend range for the output
L
= Switching Frequency
=
------------------ -
F
CAPACITOR VALUE RANGE
V
SW
OUT
×
4.7 µF
C
—
L
IN
×
⎛
⎝
1
–
L
). The inductor DC
V
------------ -
V
OUT
IN
4.7 µF
22 µF
C
⎞
⎠
OUT
TABLE 5-2:
5.7
The MCP1603 is available in two different packages
(TSOT-23 and 2x3 DFN). By calculating the power
dissipation
resistance, (θ
estimated.
temperature rating for the MCP1603 is +125°C.
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
MCP1603. There is some percentage of power lost in
the buck inductor, with very little loss in the input and
output capacitors.
Coiltronics
Würth Elektronik
Sumida
CMD4D06
CMD4D06
CMD4D06
⎛
⎝
WE-TPC
WE-TPC
WE-TPC
WE-TPC
Number
Type XS
Type XS
SD3812
SD3812
SD3812
SD3110
SD3110
SD3110
Type S
Type S
V
------------------------------ -
Part
Efficiency
OUT
®
Thermal Calculations
×
®
I
and
The
JA
OUT
Value
(µH)
3.3
4.7
6.8
3.3
4.7
6.8
3.3
4.7
4.7
6.8
3.3
4.7
6.8
),
MCP1603 RECOMMENDED
INDUCTORS
⎞
⎠
®
applying
maximum
the
–
(max)
(
0.195
0.285
0.346
0.159
0.256
0.299
0.225
0.290
0.105
0.156
0.174
0.216
0.296
DCR
V
Ω
junction
OUT
MCP1603
the
×
0.81
0.68
0.58
1.40
1.13
0.95
0.72
0.50
0.90
0.75
0.77
0.75
0.62
I
continuous
(A)
SAT
I
OUT
package
DS22042A-page 15
temperature
WxLxH (mm)
3.3x3.5x0.95
3.3x3.5x0.95
3.8x3.8x1.65
3.8x3.8x1.65
3.1x3.1x1.0
3.1x3.1x1.0
3.1x3.1x1.0
3.8x3.8x1.2
3.8x3.8x1.2
3.8x3.8x1.2
3.5x4.3x0.8
3.5x4.3x0.8
3.5x4.3x0.8
)
=
Size
P
junction
thermal
Diss
is