SC196AMLTRT Semtech, SC196AMLTRT Datasheet - Page 9

• Manufacturer Part Number: SC196AMLTRT
• Description: IC SYNC BUCK CONV 1.5A 10-MLP
• Manufacturer: Semtech
• Type: Step-Down (Buck)r

Specifications of SC196AMLTRT

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1V, 1.05V, 1.2V, 1.8V
• Current - Output: 1.5A
• Frequency - Switching: 1MHz
• Voltage - Input: 2.7 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: SC196AMLTR

Inductor Selection
The SC196A is designed for use with a 4.7μH inductor.
The magnitude of the inductor current ripple is dependent
on the inductor value and can be determined by the
following equation:
This equation demonstrates the relationship between
input voltage, output voltage, and inductor ripple current.
The inductor should have a low DCR to minimize the
conduction losses and maximize effi ciency. As a minimum
requirement, the DC current rating of the inductor
should be equal to the maximum load current plus half
of the inductor current ripple, as shown by the following
equation:
Final inductor selection will depend on various design
considerations, such as effi ciency, EMI, size and cost.
Table 1 lists the manufacturers of practical inductor
options.
C
The source input current to a buck converter is non-
continuous. To prevent large input voltage ripple, a low
ESR ceramic capacitor is required. A minimum value of
10μF should be used for suffi cient input voltage fi ltering,
and a 22μF should be used for improved input voltage
fi ltering.
C
The internal compensation is designed to work with a
certain output fi lter corner frequency, which is defi ned by
the equation:
This single pole fi lter is designed to operate with a
minimum output capacitor value of 10μF. Larger output
capacitor values will improve transient performance.
If PSAVE operation is required, the minimum capacitor
value is 22μF.
© 2008 Semtech Corp.
POWER MANAGEMENT
Applications Information (Cont.)
IN
OUT
Selection
Selection
I
L
f
I
C
LPK
2
V
I
OUT
OUT
(
MAX
L
1
L
)
1
C
OUT
2
f
I
OSC
L
V
V
OUT
I
N
9
Output voltage ripple is a combination of the voltage ripple
from the charge - discharge cycle of the output capacitor
and the voltage created by the inductor ripple current
passing through the output capacitor ESR. Selecting an
output capacitor with a low ESR will reduce the output
voltage ripple component, as can be seen in the following
equation:
Capacitors with X7R or X5R ceramic dielectric are
strongly recommended for their low ESR and superior
temperature and voltage characteristics. Y5V capacitors
should not be used as their temperature coeffi cients
make them unsuitable for this application. Table 2 lists
the manufacturers of recommended capacitor options.
Note: recommended Inductors do not necessarily guarantee rated perfor-
mance of the part.
Note: Where PSAVE operation is required, 22μF must be used for C
BI Technologies
HM66404R1
Coilcraft
D01608C-472ML
TDK
VLCF4020T- 4R7N1R2
Taiyo Yuden
LMNP04SB4R7N
TOKO
D52LC
Sumida
CDRH3D16
Coilcraft
LPS3015
Murata
GRM21BR60J226ME39L
Murata
GRM188R60J106
MKE19
TDK
C2012X5R0J106K
Manufacturer/Part #
Manufacturer/Part #
Table 2 — Recommended Capacitors
Table 1 — Recommended Inductors
V
Value
Value
(μH)
(μF)
4.1
4.7
4.7
4.7
4.7
4.7
4.7
OUT
22
10
10
(
ESR
)
0.057
0.098
0.050
0.087
0.050
DCR
0.09
(Ω)
0.2
Voltage
Rated
(VDC)
6.3
6.3
6.3
I
( L
ripple
Current
Rated
1.95
1.24
1.14
(A)
1.5
1.2
1.2
1.1
)
Characteristic
Temperature
ESR
X5R
X5R
X5R
Tolerance
(
COUT
PRELIMINARY
(%)
20
20
30
30
20
30
20
)
www.semtech.com
SC196A
Case Size
6.6 × 4.5 × 3.0
4.0 × 4.0 × 2.0
5.0 × 5.0 × 2.0
5.0 × 5.0 × 2.0
3.8 × 3.8 × 1.8
3.0 × 3.0 × 1.5
5.7 × 5.7 ×2.0
Dimensions
0805
0603
0603
LxWxH
OUT
(mm)
.