LT3582EUD-5#TRPBF Linear Technology, LT3582EUD-5#TRPBF Datasheet - Page 19

IC DC/DC CONV +/-5V 16-QFN

LT3582EUD-5#TRPBF

Manufacturer Part Number
LT3582EUD-5#TRPBF
Description
IC DC/DC CONV +/-5V 16-QFN
Manufacturer
Linear Technology
Type
Step-Up (Boost), Invertingr
Datasheet

Specifications of LT3582EUD-5#TRPBF

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
2
Voltage - Output
±5V
Current - Output
350mA, 600mA
Voltage - Input
2.55 ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-WQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Frequency - Switching
-

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Maximum Load Currents: Use one of the following equa-
tions to estimate the maximum output load current for the
positive and negative output voltages:
where:
For example, if V
L = 4.7μH then I
Note: The 155mA (Typ) current limit of the output dis-
connect PMOS (see Electrical Characteristics) may limit
maximum I
Improving Boost Converter Effi ciency section.
Maximum Slew Rate: Lower inductance causes higher
current slew rates which can lead to current limit over-
shoot. Choose an inductance higher than L
the overshoot:
where V
previous example V
APPLICATIONS INFORMATION
I
or I
OUTP
V
V
V
IN(MIN)
IN(MIN)
V
V
I
η
T
I
L
OUTP
OUTN
PK
OUT
OFF_MIN
MIN
OUT
IN(MIN)
V
=
IN(MIN)
= V
IN(MAX)
=
+ |V
⎟ • I
OUTP
IN(MAX)
= Regulation voltage
= Minimum input voltage.
= Peak inductor current. See the Peak
= Power conversion effi ciency (about 88%
= Minimum switch off time. Typically 100ns
= Output load current
OUTN
PK
Current Rating section. Use minimum
I
for Boost or 78% for Inverting)
for Boost and 125ns for Inverting.
LIMIT
is the maximum input voltage. Using the
OUTP
unless CAPP is shorted to V
|
OUTP
T
⎟ • I
OFF _ MIN
• 0.2μH
IN
rating for these calculations.
PK
= 117mA and I
= 3V, L
= 10V, V
T
• (V
OFF _ MIN
MIN
OUTP
OUTN
2 • L
= 0.6μH.
+ 0.5 – V
• (|V
2 • L
= –10V, V
OUTN
OUTN
= 105mA.
IN(MIN)
| +0.5)
OUTP
MIN
IN
= 5V, and
)
. See the
⎟ • 0.8η
to limit
⎟ • 0.8η
Capacitor Selection
The small size and low ESR of ceramic capacitors makes
them suitable for most LT3582 series applications. X5R
and X7R types are recommended because they retain their
capacitance over wider voltage and temperature ranges
than other types such as Y5V or Z5U. A 4.7μF input capaci-
tor and a 2.2μF to 10μF output capacitor are suffi cient for
most LT3582 series applications. Always use a capacitor
with a suffi cient voltage rating. Many capacitors rated at
2.2μF to 10μF , particularly 0805 or 0603 case sizes, have
greatly reduced capacitance at the desired output voltage.
Generally a 1206 capacitor will be adequate. A 0.22μF to
1μF capacitor placed on the CAPP node is recommended
to fi lter the inductor current while the larger 2.2μF to 10μF
placed on the V
transient response and stability. Avoid placing large value
capacitors (generally > 6.8μF) on both CAPP and V
This confi guration can be less stable since it creates two
poles, one at the CAPP pin and the other at the V
pin, which can be near each other in frequency. Table 4
shows a list of several capacitor manufacturers. Consult
the manufacturers for more detailed information and for
their entire selection of related parts.
Table 4. Ceramic Capacitor Manufacturers
MANUFACTURER
Kemet
Murata
Taiyo Yuden
TDK
Diode Selection
Schottky diodes, with their low forward voltage drops and
fast switching speeds, are recommended for use with the
LT3582 series. The Diodes Inc. B0540WS is a very good
choice in a small SOD-323 package. This diode is rated to
handle an average forward current of 500mA and performs
well across a wide temperature range. Schottky diodes
with very low forward voltage drops are also available.
These diodes may improve effi ciency at moderate and cold
temperatures, but will likely reduce effi ciency at higher
temperatures due to excessive reverse leakage currents.
LT3582/LT3582-5/LT3582-12
OUTP
PHONE
408-986-0424
814-237-1431
408-573-4150
847-803-6100
and V
OUTN
URL
www.kemet.com
www.murata.com
www.t-yuden.com
www.tdk.com
nodes will give excellent
19
3582512fb
OUTP
OUTP
.

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