LTC4011 Linear Technology, LTC4011 Datasheet - Page 22

• Manufacturer Part Number: LTC4011
• Description: High Efficiency Standalone Nickel Battery Charger
• Manufacturer: Linear Technology

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APPLICATIO S I FOR ATIO
LTC4011
7. Connection of switching ground to system ground, or
8. Route analog ground as a trace tied back to the
9. A good rule of thumb for via count in a given high
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any internal ground plane should be single-point. If
the system has an internal system ground plane, a
good way to do this is to cluster vias into a single star
point to make the connection.
LTC4011 GND pin before connecting to any other
ground. Avoid using the system ground plane. A
useful CAD technique is to make analog ground a
separate ground net and use a 0Ω resistor to connect
analog ground to system ground.
current path is to use 0.5A per via. Be consistent when
applying this rule.
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W
Figure 14. Kelvin Sensing of Charge Current
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DIRECTION OF CHARGING CURRENT
SENSE
R
SENSE
10. If possible, place all the parts listed above on the same
11. Copper fills or pours are good for all power connec-
12. For best current programming accuracy, provide a
13. It is important to minimize parasitic capacitance on
BAT
PCB layer.
tions except as noted above in Rule 3. Copper planes
on multiple layers can also be used in parallel. This
helps with thermal management and lowers trace
inductance, which further improves EMI performance.
Kelvin connection from R
See Figure 14 for an example.
the TIMER, SENSE and BAT pins. The traces connect-
ing these pins to their respective resistors should be
as short as possible.
4011 F14
SENSE
to SENSE and BAT.
4011p