SPX1117M3-L-1-8 Exar Corporation, SPX1117M3-L-1-8 Datasheet - Page 8

• Manufacturer Part Number: SPX1117M3-L-1-8
• Description: IC REG LDO 1.8V 800MA SOT223-3
• Manufacturer: Exar Corporation
• Series: -r

Specifications of SPX1117M3-L-1-8

• Package / Case: TO-261-4, TO-261AA, SOT-223-4
• Regulator Topology: Positive Fixed
• Voltage - Output: 1.8V
• Voltage - Input: Up to 15V
• Voltage - Dropout (typical): 1.1V @ 800mA
• Number Of Regulators: 1
• Current - Output: 800mA
• Current - Limit (min): 1A
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Input Voltage Max: 20 V
• Output Type: Adjustable, Fixed
• Dropout Voltage (max): 1.1 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Output Voltage
The output of the adjustable regulator can be set
to any voltage between 1.25V and 15V. The
value of V
the formula
A small correction to this formula is required
depending on the values of resistors R
since the adjustable pin current (approx 50µA)
flows through R
count, the formula becomes
Apr 20-07 Rev B
Figure 21. Current Source
V
IN
TABLE 1
4.7µF
PC BOARD
2500
2500
2500
2500
2500
1600
2500
2500
1600
+
I
900
900
OUT
mm
OUT
C
V
1
=
2
OUT
can be quickly approximated using
V
IN
R
REF
1
=1.25 *(R
2
. When I
SPX1117
TOPSIDE COPPER
ADJ
1
+ R
ADJ
2500
1250
2500
1800
1250
OUT
mm
950
600
915
600
240
240
is taken into ac-
2
)/R
SPX1117 800mA Low Dropout Voltage Regulator
2
LOAD
1
.
R
1
1
I
OUT
and R
C
2
BACKSIDE COPPER
V
OUT
2
,
8
2500
2500
2500
1600
APPLICATION INFORMATION: Continued
900
mm
where
Layout Considerations
lation. In order to avoid this, connect R
to V
reason, R
side of the load.
Parasitic line resistance can degrade load regu-
Figure 22. Typical Adjustable Regulator
0
0
0
0
0
0
2
OUT
V
IN
V
4.7µF +
V
OUT
as illustrated in Figure 25. For the same
OUT
2
= V
= V
should be connected to the negative
REF
C
1
(1+R
REF
IN
2
V
/R
(1+ (R
1
THERMAL RESISTANCE
) +I
REF
SPX1117
ADJ
=1.25V.
R
© 2007 Sipex Corporation
ADJ
50µA
I
ADJ
JUNC. TO AMB.
2
2
/R
1
OUT
)) + I
°C/W
V
REF
46
47
49
51
53
55
58
59
67
72
85
ADJ
R
R
1
2
* R
C
1
2
directly
2
V
,
OUT