ADP3158 datasheet(14/16 Pages) AD

14 / 16 page

REV. A

ADP3158/ADP3178

–14–

Signal Circuitry

12. The output voltage is sensed and regulated between the

GND pin (which connects to the signal ground plane) and

the CS– pin. The output current is sensed (as a voltage)

and regulated between the CS– pin and the CS+ pin. In

order to avoid differential mode noise pickup in those sensed

signals, their loop areas should be small. Thus the CS–

trace should be routed atop the signal ground plane, and

the CS+ and CS– traces should be routed as a closely

coupled pair (CS+ should be over the signal ground plane

as well).

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

16-Lead SOIC

(R-16A/SO-16)

0.2440 (6.20)

0.2284 (5.80)

0.1574 (4.00)

0.1497 (3.80)

PIN 1

0.3937 (10.00)

0.3859 (9.80)

0.050 (1.27)

BSC

SEATING

PLANE

0.0098 (0.25)

0.0040 (0.10)

0.0192 (0.49)

0.0138 (0.35)

0.0688 (1.75)

0.0532 (1.35)

0.0196 (0.50)

0.0099 (0.25)

0.0500 (1.27)

0.0160 (0.41)

0.0099 (0.25)

0.0075 (0.19)

13. The CS+ and CS– traces should be Kelvin-connected to

the current sense resistor so that the additional voltage drop

due to current flow on the PCB at the current sense resistor

connections does not affect the sensed voltage. It is desir-

able to have the controller IC close to the output capacitor

bank and not in the output power path, so that any voltage

drop between the output capacitors and the GND pin is

minimized, and voltage regulation is not compromised.

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