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參數(shù)資料
| 型號(hào)： | LSP3100CAD |
| 廠商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 12/12頁(yè) |
| 文件大?。?/td> | 368K |
| 代理商： | LSP3100CAD |
Liteon Semiconductor Corporation
LSP3100
1.5MHZ, 800mA Synchronous Step-Down Converter
Rev1.3
9/12
APPLICATION INFORMATION
R2
316K
R1
2
C3
10F
5
3
4
1
Vout 1.8V
GND
VFB
SW
Run
2.2H
Vin 2.7V-4.2V
L1
22pF
C2
C1
4.7F
632K
Vin
Fig.1 Basic Application Circuit with LSP3100 adjustable version
2
C3
10F
5
3
4
1
Vout 1.8V
GND
VOUT
SW
Run
2.2H
Vin 2.5V-5.5V
L1
C1
4.7F
Vin
Fig.2 Basic Application Circuit with fixed output versions
SETTING THE OUTPUT VOLTAGE
Figure 1 above shows the basic application circuit with LSP3100 adjustable output version. The external resistor
sets the output voltage according to the following equation:
+
×
=
2
1
OUT
R
1
V
6
.
0
V
For example, fixed R1=300k for all outputs; R2=300k for VOUT=1.2V, R2=200k for VOUT=1.5V, R2=150k for
VOUT=1.8V and R2=95.3k for VOUT=2.5V.
INDUCTOR SELECTION
For most designs, the LSP3100 operates with inductors of 1H to 4.7H. Low inductance values are physically
smaller but require faster switching, which results in some efficiency loss. The inductor value can be derived from
the following equation:
()
OUT
IN
OUT
IN
L
OSC
VV
V
L
VI
f
×
=
× ×
Where IL is inductor Ripple Current. Large value inductors lower ripple current and small value inductors result in
high ripple currents. Choose inductor ripple current approximately 35% of the maximum load current 800mA, or
IL=280mA.
For output voltages above 2.0V, when light-load efficiency is important, the minimum recommended inductor is
2.2H. For optimum voltage-positioning load transients, choose an inductor with DC series resistance in the 50m
to 150m range. For higher efficiency at heavy loads (above 200mA), or minimal load regulation (but some transient
overshoot), the resistance should be kept below 100m. The DC current rating of the inductor should be at least
equal to the maximum load current plus half the ripple current to prevent core saturation (800mA+140mA). Table 1
lists some typical surface mount inductors that meet target applications for the LSP3100.
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