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ADP1148AR-5 Scheda tecnica(PDF) 11 Page - Analog Devices

Il numero della parte ADP1148AR-5
Spiegazioni elettronici  High Efficiency Synchronous Step-Down Switching Regulators
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ADP1148, ADP1148-3.3, ADP1148-5
–11–
REV. A
Board Layout
When laying out the printed circuit board, the following check
list should be used to ensure proper operation of the ADP1148.
These items are also illustrated graphically in the layout diagram
of Figure 18. Check the following in your layout:
1) Are the signal and power grounds segregated? The ADP1148
SIGNAL GND (Pin 11) must return to the (–) plate of COUT.
The power ground returns to the source of the N-channel
MOSFET, anode of the Schottky diode, and (–) plate of CIN,
which should have as short lead lengths as possible.
2) Does the ADP1148 SENSE(–), (Pin 7), connect to a point
close to RSENSE and the (+) plate Of COUT? In adjustable
versions the resistive divider R1, R2 must be connected be-
tween the (+) plate of COUT and signal ground.
3) Are the SENSE(–) and SENSE(+) leads routed together with
minimum PC trace spacing? The 1000 pF capacitor between
Pins 7 and 8 should be as close as possible to the ADP1148.
4) Does the (+) plate of CIN connect to the source of the
P-channel MOSFET as closely as possible? This capacitor
provides the ac current to the P-channel MOSFET.
5) Is the input decoupling capacitor (1
µF) connected closely
between VIN (Pin 3) and POWER GND (Pin 12)? This
capacitor carries the MOSFET driver peak currents.
6) Is INTVCC (Pin 5) decoupled with a 10 nF capacitor to
signal ground?
7) Is the SHUTDOWN (Pin 10) actively pulled to ground
during normal operation? The Shutdown pin is high imped-
ance and must not be allowed to float.
To prevent noise spikes from erroneously tripping the current
comparator, a 1000 pF capacitor is needed across Sense(–) and
Sense(+).
P-DRIVE
NC
VIN
CT
INT VCC
ITH
SENSE(–)
N-DRIVE
NC
POWER GND
SIGNAL GND
SHUTDOWN
VFB
SENSE(+)
ADP1148
3300pF
1k
D1
CIN
L
R1
R2
COUT
10nF
CT
1 F
1
2
3
4
5
6
7
14
13
12
11
10
9
8
N-CHANNEL
1000pF
R1, R2 OUTPUT DIVIDER REQUIRED
FOR ADJUSTABLE VERSION ONLY.
RSENSE
VIN
VOUT
P-CHANNEL
NC = NO CONNECT
Figure 18. ADP1148 Layout Diagram (See Board Layout)


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