LTC4001-1 Linear Technology, LTC4001-1 Datasheet - Page 18

• Manufacturer Part Number: LTC4001-1
• Description: 2A Synchronous Buck Li-Ion Charger
• Manufacturer: Linear Technology

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APPLICATIONS INFORMATION
LTC4001-1
Layout Considerations
Switch rise and fall times are kept under 5ns for maximum
effi ciency. To minimize radiation, the SW pin and input
bypass capacitor leads (between PV
be kept as short as possible. A ground plane should be
used under the switching circuitry to prevent interplane
coupling. The Exposed Pad must be connected to the
ground plane for proper power dissipation. The other paths
contain only DC and/or 1.5MHz tri-wave ripple current and
are less critical.
18
4.5V TO 5.5V
V
IN
Figure 8. 2A Li-Ion Battery Charger with 3Hr Timer, Temperature
Qualifi cation, Soft-Start, Remote Sensing and C/10 Indication
L1: VISHAY DALE IHLP-2525AH-01
R3: NTC VISHAY DALE NTHS0603N02N1002J
R1
10k
R3
10k
AT 25°C
IN
R2
1k
and PGND) should
LED
D1
10μF
FROM μP
C1
TO μP
549Ω
R4
V
PV
PGND
CHRG
NTC
FAULT
EN
PROG
INSENSE
IN
IDET
0.22μF
R5
549Ω
SW
With the exception of the input and output fi lter ca-
pacitors (which should be connected to PGND) all other
components that return to ground should be connected
to GNDSENS.
Recommended Components Manufacturers
For a list of recommend component manufacturers, contact
the Linear Technology application department.
C2
LTC4001-1
TIMER
1.5μH
L1
SENSE
SS
C3
0.1μF
BATSENS
GNDSENS
BAT
C4
10μF
40011 F08
+
2AHr
4.1V
Li-Ion
40011fa