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ADP3310AR-33 Datasheet(PDF) 7 Page - Analog Devices

Part # ADP3310AR-33
Description  Precision Voltage Regulator Controller
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP3310AR-33 Datasheet(HTML) 7 Page - Analog Devices

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ADP3310
–7–
REV. A
ADP3310-3.3
IN
OUT
GATE
MI
IRF7404
+
OSCON
220 F
C1
1 F
VIN = 5V TO 15V
C2
10nF
IRF7204
L*
68µH
N-CH
IRF7403
C3
1nF
D1
10BQ040
C4
RSENSE**
0.1
R1
30.1k
1%
2N3906
Q1
R2
124k
1%
RC
1k
CC
22nF
CT
470pF
R3
274k
2N3906
Q2
C5
10 F
3.3V/1A
VIN
INT VCC
P-DRIVE
ITH
CT
SENSE+
SENSE
N-DRIVE
FB
S-GND P-GND
ADP1148
SD
CIN
OSCON
220 F
GND
** COILTRONICS CTX-68-4
** KRL SL-1-C1-ORO5OL
BAT54
IS
EN
Figure 15. High Current Post Regulator with SOIC PMOS
Current Limit Threshold Voltage = 0.05 V
Safety Factor = 1.5
IO = Output Current
RS is not needed in circuits that do not require current limiting.
In that case, the IS pin must be tied to the input pin.
The simplest and cheapest sense resistor for high current applica-
tions, (i.e., Figure 1) is a PCB trace. The temperature depen-
dence of the copper trace and the thickness tolerances of the
trace must be taken into account in the design. The resistivity of
copper has a positive temperature coefficient of +0.39%/
°C.
Copper’s Tempco in conjunction with the proportional-to-
absolute temperature (PTAT) current limit voltage can provide
an accurate current limit. Table II provides the resistance value
for PCB copper traces. Alternately, an appropriate sense resistor
such as surface mount sense resistors available from KRL can be
used.
PCB-Layout Issues
For optimum voltage regulation, place the load as close as pos-
sible to the device’s VOUT and GND pins. It is recommended to
use dedicated PCB traces to connect the MOSFET’s drain to
the positive terminal and GND to the negative terminal of the
load to avoid voltage drops along the high current carrying PCB
traces.
Application Circuits
Typical 3 A LDO Circuit
The ADP3310 and a power MOSFET can be used to power the
new generation of CPUs and microprocessors from the standard
+5 V supply at a very low cost (Figure 14). This circuit provides
low dropout, fast switching and high switching load current
from 0 A to 3 A. Due to the high switching load current, capaci-
tors with high ripple current carrying capability, such as OSCON
or special tantalum capacitors from Sprague (593D), are recom-
mended for the output.
Table II. Printed Circuit Copper Resistance
Conductor
Conductor Width
Resistance
Thickness
In
m
Ω/In
1/2 oz/ft2
0.025
39.3
(18
µm)
0.050
19.7
0.100
9.83
0.200
4.91
0.500
1.97
1 oz/ft2
0.025
19.7
(35
µm)
0.050
9.83
0.100
4.91
0.200
2.46
0.500
0.98
2 oz/ft
2
0.025
9.83
(70
µm)
0.050
4.91
0.100
2.46
0.200
1.23
0.500
0.49
3 oz/ft2
0.025
6.5
(106
µm)
0.050
3.25
0.100
1.63
0.200
0.81
0.500
0.325
M1
NDP6020P
10 F
4.5V TO 5.5V
10 F
IS
GND
EN
VIN
VOUT
ADP3310-3.3
+
R2
0.011
GATE
1k
220 F
OSCON
+
3
220 F
OSCON
3.3V
Figure 14. Typical 3 A Low Dropout Regulator Circuit
50mV/div
2V/div
5
µs/div


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