LM2744MTC/NOPB National Semiconductor, LM2744MTC/NOPB Datasheet - Page 19
![IC REG SYNC BUCK N-CH 14-TSSOP](/photos/6/62/66280/pkg_mtc14_sml.jpg)
LM2744MTC/NOPB
Manufacturer Part Number
LM2744MTC/NOPB
Description
IC REG SYNC BUCK N-CH 14-TSSOP
Manufacturer
National Semiconductor
Series
PowerWise®r
Type
Step-Down (Buck)r
Datasheet
1.LM2744MTCXNOPB.pdf
(24 pages)
Specifications of LM2744MTC/NOPB
Internal Switch(s)
No
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.5 ~ 1.5 V
Current - Output
20A
Frequency - Switching
50kHz ~ 1MHz
Voltage - Input
1 ~ 16 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
14-TSSOP
For Use With
LM2744EVAL - BOARD EVALUATION LM2744
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Other names
*LM2744MTC
*LM2744MTC/NOPB
LM2744MTC
*LM2744MTC/NOPB
LM2744MTC
There are few additional losses that are taken into account:
IC Operating Loss (P
where I
FET Gate Charging Loss (P
The value n is the total number of FETs used and Q
typical gate-source charge value, which is 3nC. For the FD-
S6898A the gate charging loss is 5.94mW.
Input Capacitor Loss (P
where,
Here n is the number of paralleled capacitors, ESR is the
equivalent series resistance of each, and P
Q-VCC
is the typical operating V
P
GATE
P
P
GATE
IC
= 1.5mA *3.3V = 4.95mW
= 2 x 3.3V x 3nC x 300kHz
P
P
IC
= n * V
IC)
GATE
= I
CAP
Q_VCC
= 5.94mW
)
CC
GATE
* Q
x V
)
GS
CC
CC
* F
,
current
OSC
CAP
is the dissipa-
GS
is the
19
tion in each. So for example if we use only one input capacitor
of 24 mΩ.
Output Inductor Loss (P
where DCR is the DC resistance. Therefore, for example
Total System Efficiency
P
P
IND
P
IND
P
CAP
IND
= (4A)
= I
IND
= 88.8mW
= 176mW
2
)
OUT
2
x 11mΩ
* DCR
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