ltc4001 Linear Technology Corporation, ltc4001 Datasheet - Page 18

• Manufacturer Part Number: ltc4001
• Description: 2a Synchronous Buck Li-ion Charger
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
Layout Considerations
Switch rise and fall times are kept under 5ns for maximum
efficiency. 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.
LTC4001
18
4.5V TO 5.5V
U
V
U
IN
Figure 8. 2A Li-Ion Battery Charger with 3Hr Timer, Temperature
Qualification, 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
W
R2
1k
IN
LED
and PGND) should
D1
10µF
FROM µP
C1
TO µP
U
549Ω
R4
V
PV
PGND
CHRG
NTC
FAULT
EN
PROG
INSENSE
IN
IDET
0.22µF
R5
549Ω
SW
C2
LTC4001
TIMER
With the exception of the input and output filter capacitors
(which should be connected to PGND) all other compo-
nents that return to ground should be connected to
GNDSENS.
Recommended Components Manufacturers
For a list of recommend component manufacturers, con-
tact the Linear Technology application department.
1.5µH
L1
SENSE
SS
C3
0.1µF
BATSENS
GNDSENS
BAT
C4
10µF
4001 F08
+
2AHr
4.2V
Li-Ion
4001f