Ds2710 single-cell nimh charger, Package information – Rainbow Electronics DS2710 User Manual
Page 11
DS2710
Single-Cell NiMH Charger
______________________________________________________________________________________
11
DS2710
V
DD
THM
STATUS
VP1
VN1
VN0
TMR
CTEST
V
SS
CS
R6
1k
Ω
R3
270k
Ω
R2
1k
Ω
R1
150
Ω
R4
10k
Ω
R7
100k
Ω
R8
47k
Ω
R9
0.1
Ω
1W
1S
NiMH
CELL
C1
1
μF
C3
10
μF
CERAMIC
Q1
ZXM62P02E6
+5V
(USB+)
GROUND
(USB-)
L1
15
μH
SISCDRH74M-150R
D2
1W B340A-13
SCHOTTKY
C2
10
μF
CERAMIC
D1
GREEN
SMA
RT1
103AT-2
Figure 5. Typical Application Circuit for USB Port Charging
Referring to the example circuit and layout of Figure 6,
the loop labeled as Loop1 encompassing C
IN
,
Q
SWITCH
, and D
SWITCH
should be kept as small as
possible to minimize the change in loop area that
occurs when switching from the OFF to the ON state
and vice versa. Loop2 should also be minimized as
much as practical, although it contains DC current
components for the most part. The returning ground
currents should be allowed to follow a path on a layer
directly under the outgoing path since the high-fre-
quency components try to follow the path of least
impedance. Low ESR and ESL capacitors should be
used when possible and for all capacitors 10µF and
smaller. Typical surface-mount ceramic types with an
X5R or better dielectric are recommended.
Another important layout detail is the connection of the
sense resistor. Proper Kelvin connection layout should
be used to ensure the signal quality viewed by the
sensing circuit inside the DS2710 is adequate. Figure 7
shows a recommended connection of the sense lines to
the resistor footprint.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
10 TDFN-EP
—
Package Information
For the latest package outline information and land patterns, go
to
www.maxim-ic.com/packages
.