參數(shù)資料
型號(hào)： LT3652EDD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 3 A BATTERY CHARGE CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO12
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12
文件頁(yè)數(shù)： 14/26頁(yè)
文件大?。?/td> 253K
代理商： LT3652EDD#TRPBF
LT3652
21
3652fc
In some cases, the thermal foldback protection feature
can reduce charger currents below the C/10 threshold. In
applications that use C/10 termination (TIMER=0V), the
LT3652 will suspend charging and enter standby mode
until the excessive temperature condition is relieved.
Layout Considerations
The LT3652 switch node has rise and fall times that are
typically less than 10nS to maximize conversion efficiency.
The switch node (Pin SW) trace should be kept as short
as possible to minimize high frequency noise. The input
capacitor (CIN) should be placed close to the IC to minimize
this switching noise. Short, wide traces on these nodes
also help to avoid voltage stress from inductive ringing.
The BOOST decoupling capacitor should also be in close
proximity to the IC to minimize inductive ringing. The
SENSE and BAT traces should be routed together, and
these and the VFB trace should be kept as short as pos-
sible. Shielding these signals from switching noise with
a ground plane is recommended.
High current paths and transients should be kept iso-
lated from battery ground, to assure an accurate output
APPLICATIONS INFORMATION
voltage reference. Effective grounding can be achieved
by considering switched current in the ground plane,
and careful component placement and orientation can
effectively steer these high currents such that the battery
reference does not get corrupted. Figure 11 illustrates an
effective grounding scheme using component placement
to control ground currents. When the switch is enabled
(loop #1), current flows from the input bypass capacitor
(CIN) through the switch and inductor to the battery posi-
tive terminal. When the switch is disabled (loop #2), the
current to the battery positive terminal is provided from
ground through the freewheeling Schottky diode (DF). In
both cases, these switch currents return to ground via the
output bypass capacitor (CBAT).
The LT3652 packaging has been designed to efficiently
remove heat from the IC via the Exposed Pad on the
backside of the package, which is soldered to a copper
footprint on the PCB. This footprint should be made as
large as possible to reduce the thermal resistance of the
IC case to ambient air.
SW
VIN
RSENSE
SENSE
BAT
VFB
+
LT3652
DF
CIN
CBAT
VBAT
2
3652 F11
1
Figure 11. Component Orientation Isolates High Current Paths
from Sensitive Nodes
相關(guān)PDF資料
PDF描述
LT3652HVEDD#PBF BATTERY CHARGE CONTROLLER, PDSO12
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LT3663EMS8E-3.3#PBF 2.5 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PDSO8
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