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LT3471 Datasheet(PDF) 7 Page - Linear Technology

Part # LT3471
Description  Dual 1.3A, 1.2MHz Boost/Inverter in 3mm x 3mm DFN
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3471 Datasheet(HTML) 7 Page - Linear Technology

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LT3471
3471f
APPLICATIONS INFORMATION
Supply Current of Figure 2 During
Start-Up without Soft-Start RC Network
VOUT1
2V/DIV
ISUPPLY
0.5A/DIV
0.1ms/DIV
3471 F02b
Supply Current of Figure 2 During
Start-Up with Soft-Start RC Network
RSS1
4.7k
RSS2
4.7k
CONTROL 1
3471 F02
CSS1
0.33µF
CSS2
0.33µF
10µF
VIN
2.6V TO 4.2V
Li-Ion
SHDN/SS1
FB1N
9
0V
1.8V
CONTROL 2
0V
1.8V
8
7
SW1
SW2
LT3471
L2
10µH
L3
15µH
GND
FB1P
VIN
FB2P
FB2N
VREF
C2
0.1µF
C3
4.7µF
CPL
33pF
VOUT1
7V
VOUT2
–7V
C1, C2: X5R OR X7R 6.3V
C3, C4: X5R OR X7R 10V
C5: XR5 OR X7R 16V
CPL: OPTIONAL
D1, D2: ON SEMICONDUCTOR MBRM-120
L1: SUMIDA CR43-2R2
L2: SUMIDA CDRH4D18-100
L3: SUMIDA CDRH4D18-150
C6
75pF
R2
15k
R3
90.9k
R4
15k
R1
105k
C5
1µF
SHDN/SS2
VIN
10
1
2
3
5
4
11
6
VIN
C4
10µF
D2
L1
2.2µH
D1
Figure 2. Li-Ion OLED Driver
sufficient for most applications. Table 2 shows a list of
several ceramic capacitor manufacturers. Consult the
manufacturers for detailed information on their entire
selection of ceramic parts.
Table 2. Ceramic Capacitor Manufacturers
Taiyo Yuden
(408) 573-4150
www.t-yuden.com
AVX
(803) 448-9411
www.avxcorp.com
Murata
(714) 852-2001
www.murata.com
The decision to use either low ESR (ceramic) capacitors or
the higher ESR (tantalum or OS-CON) capacitors can
affect the stability of the overall system. The ESR of any
capacitor, along with the capacitance itself, contributes a
zero to the system. For the tantalum and OS-CON capaci-
tors, this zero is located at a lower frequency due to the
higher value of the ESR, while the zero of a ceramic capaci-
tor is at a much higher frequency and can generally be
ignored.
A phase lead zero can be intentionally introduced by
placing a capacitor (CPL) in parallel with the resistor (R3)
between VOUT and VFB as shown in Figure 2. The frequency
of the zero is determined by the following equation.
VOUT1
2V/DIV
ISUPPLY
0.5A/DIV
0.2ms/DIV
3471 F02c



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