Datasheet

MCP16331
DS20005308B-page 20  2014 Microchip Technology Inc.
5.7 Freewheeling Diode
The freewheeling diode creates a path for inductor cur-
rent flow after the internal switch is turned off. The aver-
age diode current is dependent upon output load
current at duty cycle (D). The efficiency of the converter
is a function of the forward drop and speed of the free
-
wheeling diode. A low forward drop Schottky diode is
recommended. The current rating and voltage rating of
the diode is application dependent. The diode voltage
rating should be a minimum of V
IN
, plus margin. The
average diode current can be calculated using
Equation 5-6.
EQUATION 5-6: DIODE AVERAGE
CURRENT
TABLE 5-3: MCP16331 RECOMMENDED
3.3V INDUCTORS
Part Number
Value
(µH)
DCR ()
I
SAT
(A)
Size
WxLxH
(mm)
Coilcraft
®
ME3220-153 15 0.52 0.90 3.2x2.5x2.0
LPS4414-153 15 0.440 0.92 4.4x4.4x1.4
LPS6235-153 15 0.125 2.00 6.2x6.2x3.5
MSS6132-153 15 0.106 1.56 6.1x6.1x3.2
MSS7341-153 15 0.055 1.78 6.6x6.6x4.1
LPS3015-153 15 0.700 0.62 3.0x3.0x1.5
Wurth Elektronik
®
744025150 15 0.400 0.900 2.8x2.8x2.8
744042150 15 0.22 0.75 4.8x4.8x1.8
7447779115 15 0.081 2.2 7.3x7.3x4.5
Coiltronics
®
SD12-150R 15 0.408 0.692 5.2x5.2x1.2
SD3118-150-R 15 0.44 0.75 3.2x3.2x1.8
SD52-150-R 15 0.161 0.88 5.2x5.5.2.0
Sumida
®
CDPH4D19FNP
-150MC
15 0.075 0.66 5.2x5.2x2.0
CDRH3D16/
HPNP-150MC
15 0.410 0.65 4.0x4.0x1.8
TDK - EPCOS
®
B82462G4153M 15 0.097 1.05 6.3x6.3x3
TABLE 5-4: MCP16331 RECOMMENDED
5V INDUCTORS
Part Number
Value
(µH)
DCR ()
I
SAT
(A)
Size
WxLxH
(mm)
Coilcraft
®
ME3220-223 22 0.787 0.71 3.2x2.5x2.0
LPS4414-223 22 0.59 0.74 4.4x4.4x1.4
LPS6235-223 22 0.145 1.7 6.2x6.2x3.5
MSS6132-223 22 0.158 1.22 6.1x6.1x3.2
MSS7341-223 22 0.082 1.42 6.6x6.6x4.1
LPS3015-223 22 0.825 0.5 3.0x3.0x1.5
Wurth Elektronik
®
744025220 22 0.575 0.75 2.8x2.8x2.8
744042220 22 0.3 0.6 4.8x4.8x1.8
7447779122 22 0.11 1.7 7.3x7.3x4.5
Cooper Bussman
®
SD12-220-R 22 0.633 0.574 5.2x5.2x1.2
SD3118-220-R 22 0.676 0.61 3.2x3.2x1.8
SD52-220-R 22 0.204 0.73 5.2x5.2x2
Sumida
®
CDPH4D19FNP
-220MC
22 0.135 0.54 5.2x5.2x2
CDRH3D16/
HPNP-220MC
22 0.61 0.55 4.0x4.0x1.8
TDK - EPCOS
®
82462G4223M 22 0.15 0.85 6.3x6.3x3
I
DAVG
1D–I
OUT
 =