LTC3728EUH#PBF Linear Technology, LTC3728EUH#PBF Datasheet - Page 14
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LTC3728EUH#PBF
Manufacturer Part Number
LTC3728EUH#PBF
Description
IC SW REG SYNC STP-DN DUAL 32QFN
Manufacturer
Linear Technology
Series
PolyPhase®r
Type
Step-Down (Buck)r
Datasheet
1.LTC3728EGPBF.pdf
(36 pages)
Specifications of LTC3728EUH#PBF
Internal Switch(s)
No
Synchronous Rectifier
Yes
Number Of Outputs
2
Voltage - Output
0.8 ~ 5.5 V
Current - Output
3A
Frequency - Switching
250kHz ~ 550kHz
Voltage - Input
3.5 ~ 36 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
32-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
OPERATION
LTC3728
A fi nal question: If 2-phase operation offers such an ad-
vantage over single-phase operation for dual switching
regulators, why hasn’t it been done before? The answer
is that, while simple in concept, it is hard to implement.
Constant-frequency current mode switching regulators
require an oscillator derived slope compensation signal
to allow stable operation of each regulator at over 50%
duty cycle. This signal is relatively easy to derive in
single-phase dual switching regulators, but required the
development of a new and proprietary technique to allow
2-phase operation. In addition, isolation between the two
channels becomes more critical with 2-phase operation
because switch transitions in one channel could potentially
disrupt the operation of the other channel.
These 2-phase parts are proof that these hurdles have
been surmounted. They offer unique advantages for the
ever-expanding number of high effi ciency power supplies
required in portable electronics.
14
(Refer to Functional Diagram)
Figure 4. RMS Input Current Comparison
3.0
2.5
2.0
1.5
1.0
0.5
0
0
V
V
O1
O2
= 5V/3A
= 3.3V/3A
10
INPUT VOLTAGE (V)
DUAL CONTROLLER
SINGLE PHASE
DUAL CONTROLLER
2-PHASE
20
30
3728 F04
40
3728fg