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LT3491
APPLICATIO S I FOR ATIO
INDUCTOR SELECTION
A 10 μ H inductor is recommended for most LT3491 appli-
cations. Although small size and high efficiency are major
concerns, the inductor should have low core losses at
Table 2 shows a list of several ceramic capacitor manufac-
turers. Consult the manufacturers for detailed information
on their entire selection of ceramic parts.
Table 2. Recommended Ceramic Capacitor Manufacturers
2.3MHz and low DCR (copper wire resistance). Some
small inductors in this category are listed in Table 1. The
efficiency comparison of different inductors is shown in
Figure 3.
Table 1. Recommended Inductors
CURRENT
Taiyo Yuden
AVX
Murata
(800) 368-2496
www.t-yuden.com
(803) 448-9411
www.avxcorp.com
(714) 852-2001
www.murata.com
L
DCR
RATING
PART
LQH32CN100K53
LQH2MCN100K02
SD3112-100
( μ H)
10
10
10
( ? )
0.3
1.2
0.446
(mA)
450
225
550
VENDOR
Murata
www.murata.com
Cooper
OVERVOLTAGE PROTECTION
The LT3491 has an internal open-circuit protection circuit.
In the cases of output open circuit, when the LEDs are
www.cooperet.com
disconnected from the circuit or the LEDs fail open circuit,
1001AS-100M
(TYPE D312C)
CDRH2D11
CDRH2D14
10
10
10
0.48
0.5375
0.294
460
280
700
Toko
www.toko.com
Sumida
www.sumida.com
V CAP is clamped at 27V (typ). The LT3491 will then switch
at a very low frequency to minimize input current. The V CAP
and input current during output open circuit are shown in
the Typical Performance Characteristics. Figure 4 shows
80
75
70
65
60
the transient response when the LEDs are disconnected.
I L
200mA/DIV
55
50
45
V IN = 3.6V
4 LEDs
FRONT PAGE
APPLICATION CIRCUIT
MURATA LQH2MCN100K02
V CAP
10V/DIV
40
35
30
0
5
MURATA LQH32CN100K53
TOKO 10001AS-100M
SUMIDA CDRH2D11
SUMIDA CDRH2D14
10 15
LED CURRENT (mA)
20
V IN = 3.6V
CIRCUIT OF
FRONT PAGE
APPLICATION
500 μ s/DIV
LEDs DISCONNECTED
AT THIS INSTANT
3491 F04
3491 F03
Figure 3. Efficiency Comparison of Different Inductors
CAPACITOR SELECTION
The small size of ceramic capacitors make them ideal for
LT3491 applications. Use only X5R and X7R types be-
cause they retain their capacitance over wider temperature
ranges than other types such as Y5V or Z5U. A 1 μ F input
capacitor and a 1 μ F output capacitor are sufficient for
Figure 4. Output Open-Circuit Waveform
INRUSH CURRENT
The LT3491 has a built-in Schottky diode. When supply
voltage is applied to the V IN pin, an inrush current flows
through the inductor and the Schottky diode and charges
up the CAP voltage. The Schottky diode inside the LT3491
can sustain a maximum current of 1A.
most applications.
3491fa
7
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