SPX2941T5-L Exar Corporation, SPX2941T5-L Datasheet - Page 7

• Manufacturer Part Number: SPX2941T5-L
• Description: IC REG LDO ADJ 1.0A TO263-5
• Manufacturer: Exar Corporation

Specifications of SPX2941T5-L

• Package / Case: TO-263-6, D²Pak (5 leads + Tab), TO-263BA
• Regulator Topology: Positive Adjustable
• Voltage - Output: Adj down to 1.25V
• Voltage - Input: 3 ~ 16 V
• Voltage - Dropout (typical): 0.28V @ 1A
• Number Of Regulators: 1
• Current - Output: 1A
• Current - Limit (min): 1.5A
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 16 V
• Output Voltage: 1.25 V
• Output Type: Adjustable
• Dropout Voltage (max): 0.2 V at 100 mA
• Output Current: 1.5 A
• Line Regulation: 1 %
• Load Regulation: 1.5 %
• Voltage Regulation Accuracy: 3 %
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Reference Voltage: 1.252 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 1016-1245-5

Date: Sept 28-06 Rev E
The SPX294 incorporates protec-
tion against over-current faults, re-
versed load insertion, over temper-
ature operation, and positive and
negative transient voltage.
Thermal Considerations
Although the SPX294 offers limit-
ing circuitry for overload conditions,
it is still necessary to insure that
the maximum junction temperature
is not exceeded in the application.
Heat will flow through the lowest re-
sistance path, the junction-to-case
path. The tab of the device is elec-
trically connected to GND. In order
to insure the best thermal flow of
the component, proper mounting is
required. Consult heatsink manu-
facturer for thermal resistance and
design of heatsink.
Power dissipation is calculated as fol-
lows:
Maximum Junction Temperature range:
TJ = T
tance, junction-to-ambient)
Maximum junction temperature must
not exceed 2°C.
Capacitor Requirements
The output capacitor is needed to
insure stability and minimize the
output noise. The value of the ca-
pacitor varies with the load. How-
ever, a minimum value of 10μF
A
PD = (V
(
max
) + PD• θ
IN
-V
OUT
JA
)•(I
(thermal resis-
OUT
SPX294 A Low Dropout Linear Regulator
)

V
IN
aluminum capacitor will guarantee
stability over all load conditions. A
tantalum capacitor is recommended
if a faster load transient response is
needed. If the power source has a
high AC impedance, a 0.1μF ce-
ramic capacitor between input &
ground is recommended.
Minimum Load Current
To ensure a proper behavior of the
regulator under light load, a mini-
mum load of mA for SPX294 is
required.
Typical Application Circuit
Figure 19 shows a typical applica-
tions circuit for an adjustable output
regulator. The values of R and R2
set the output voltage value as fol-
lows:
A minimum value of 10kΩ is rec-
ommended for R2 with a range be-
tween 10kΩ to 47kΩ.
Figure 19. Adjustable Output
6.8µF
V
+
OUT
Linear Regulator
EN
= V
APPLICATION INFORMATION
4
GND
2
REF
SPX2941
3
• [ + (R/R2)].
1
ADJ
5
© 2006 Sipex Corporation
R1
R2
+
10µF
V
OUT