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参数资料
| 型号： | LSP5502SAC |
| 厂商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 470 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 7/11页 |
| 文件大小： | 275K |
| 代理商： | LSP5502SAC |
LSP5502
2A Synchronous Step Down DC/DC Converter
5/11
Rev. 1.7
www.liteon-semi.com
The input capacitor needs to be carefully selected to maintain sufficiently low ripple at the supply input of the
converter. A low ESR capacitor is highly recommended. Since large current flows in and out of this capacitor during
switching, its ESR also affects efficiency.
The input capacitance needs to be higher than 10F. The best choice is the ceramic type; however, low ESR
tantalum or electrolytic types may also be used provided that the RMS ripple current rating is higher than 50% of the
output current. The input capacitor should be placed close to the IN and G pins of the IC, with the shortest traces
possible. In the case of tantalum or electrolytic types, they can be further away if a small parallel 0.1F ceramic
capacitor is placed right next to the IC.
Output Capacitor
The output capacitor also needs to have low ESR to keep low output voltage ripple. The output ripple voltage is:
ESR
RIPPLE
OUTMAX
RIPPLE
R
K
I
V
=
OUT
LC
SW
f
IN
V
2
8
+
(3)
where IOUTMAX is the maximum output current, KRIPPLE is the ripple factor, RESR is the ESR of the output capacitor, fSW
is the switching frequency, L is the inductor value, and COUT is the output capacitance. In the case of ceramic output
capacitors, RESR is very small and does not contribute to the ripple. Therefore, a lower capacitance value can be
used for ceramic capacitors. In the case of tantalum or electrolytic capacitors, the ripple is dominated by RESR
multiplied by the ripple current. In that case, the output capacitor is chosen to have sufficiently low ESR.
For ceramic output capacitors, typically choose a capacitance of about 22F. For tantalum or electrolytic capacitors,
choose a capacitor with less than 50m ESR.
Optional Schottky Diode
During the transition between high-side switch and low-side switch, the body diode of the low side power MOSFET
conducts the inductor current. The forward voltage of this body diode is high. An optional Schottky diode may be
paralleled between the SW pin and GND pin to improve overall efficiency. Table 2 lists example Schottky diodes and
their Manufacturers.
Table 2-Diode Selection Guide
Part Number
Voltage/Current Rating
Vendor
B130
30V,1A
Lite-on Semiconductor Corp.
MBRS130
30V,1A
International Rectifier
VIN = 12V
LSP5502
IN
EN
FB
SW
C1
C2
0.1uF
C5
47pF
C6
10nF
R2
10k
R3
6.8k
COMP
R4
100k
BS
C4
2.2nF
2
7
3
5
1
8
6
SS
0.1uF
C3
4
22uF/16V
15uH/2A
L1
44.2k
VOUT = 5V/2A
R1
D1
B130/SK13
(Option)
GND
C7
22F/10V
CERAMIC
x2
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