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參數(shù)資料
| 型號： | LTC3620EDC#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 2 X 2 MM, LEAD FREE, PLASTIC, DFN-8 |
| 文件頁數(shù)： | 2/18頁 |
| 文件大?。?/td> | 318K |
| 代理商： | LTC3620EDC#PBF |
LTC3620
10
3620fa
The part is optimized to get 35mA peaks for VIN = 3.6V and
VOUT = 1.1V with an 18μH inductor. If the falling slope is
too steep the NFET will continue to conduct shortly after
the inductor current reaches zero, causing a small reverse
current. This means the net power delivered with every
pulse will decrease. To mitigate this problem the inductor
can be resized. Table 2 shows recommended inductors and
output capacitors for commonly used output voltages.
Table 2. Recommended Inductor and Output Capacitor Sizes for
Different VOUT
VOUT (V)
L (μH)
COUT (μF)
0.9
15
2.2
1.1
22
1
1.1 (LTC3620-1)
22
2.2
1.8
33
2.2
2.5
47
4.7
Because the rising dI/dt decreases for increased VOUT
and increased L, the inductor current peaks will decrease,
causing the maximum load current to decrease as well.
Figure 2 shows typical maximum load current versus
output voltage.
APPLICATIONS INFORMATION
Choosing an Inductor
There are a number of different values, sizes and brands
of inductors that will work well with this part. Table 1 has a
number of recommended inductors, though there are many
other manufacturers and devices that may also be suitable.
Consult each manufacturer for more detailed information
and for their entire selection of related parts.
Table 1: Representative Surface Mount Inductors
VENDOR
PART
NUMBER
VALUE
(μH)
DCR (Ω)
MAX DC
CURRENT
(mA)
W × L × H
(mm3)
Taiyo
Yuden
CBMF1608T 22 ±10% 1.3 Max
70
0.8 × 1.6 × 0.8
Murata
LQH2MC_02 18 ±20%
22 ±20%
1.8 ±30%
2.1 ±30%
190
185
1.6 × 2 × 0.9
Würth
Electronics
744028220 22 ±30% 1.48 Max
270
2.8 × 2.8 × 1.1
Coilcraft
LPS3010
18 ±20%
22 ±20%
1.0 Max
1.2 Max
380
320
2.95 × 2.95 × 0.9
There is a trade-off between physical size and efciency;
The inductors in Table 1 are shown because of their small
footprints, choose larger sized inductors with less core
loss and lower DCR to maximize efciency.
The ideal inductor value will vary depending on which
characteristics are most critical to the designer. Use the
equations and recommendations in the next sections to help
you nd the correct inductance value for your design.
Avoiding Audio Range Switching
In order to best avoid switching in the audio range at the
lowest possible load current, the minimum frequency
should be set as low as is acceptable, and the inductor
value should be minimized. For a 1.1V output the smallest
recommended inductor value is 15μH.
Adjusting for VOUT
The inductor current peak and zero crossing are dependent
on the dI/dt. The equations for the rising and falling slopes
are as follows:
Rising dI/dt = (VIN-VOUT)/L
Falling dI/dt = VOUT/L
OUTPUT VOLTAGE (V)
0.6
10
MAXIMUM
LOAD
CURRENT
(mA)
11
13
14
15
20
TA = 25°C
17
1.1
1.6
3620 F02
12
18
19
16
2.1
2.6
Figure 2. Maximum Output Current vs VOUT, VIN = 3.6V
Output Voltage Ripple
The quantity of charge transferred from VIN to VOUT per
switching cycle is directly proportional to the inductor
value. Consequently, the output voltage ripple is directly
proportional to the inductor value, and the switching
frequency for a given load is inversely proportional to the
inductor value. For a given load current, higher switching
frequency will typically lower the efciency because of the
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