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| 型号： | SP6669EB |
| 厂商： | Exar Corporation |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6669 |
| 标准包装： | 1 |
| 系列： | * |
| 工具箱： | 1016-1749-ND - LOW POWER DESIGN KIT 732-3616-ND - LOW POWER DESIGN KIT |
S P 6 6 6 9
6 0 0 m A 1 . 5 M H z S y n c h r o n o u s S t e p D o w n C o n v e r t e r
V OUT ? ? 1 ? OUT
? ?
L ?
4- The SW and VFB nodes should be kept as
separate as possible to minize possible effects
from the high frequency and voltage swings of
the SW node.
5- The ground plates of C IN and C OUT should be
kept as close as possible.
O UPTUT V OLTAGE R IPPLE FOR V IN CLOSE TO
V OUT
When the input voltage V IN is close to the
output voltage V OUT , the SP6669 transitions
smoothly from the switching PWM converter
mode into a LDO mode. The following diagram
shows the output voltage ripple versus the
input voltage for a 3.3V output setting and a
200mA current load.
D ESIGN E XAMPLE
In a single Lithium-Ion battery powered
application, the V IN range is about 2.7V to
4.2V. The desired output voltage is 1.8V.
The inductor value needed can be calculated
using the following equation
1 ? V ?
f ? ? I L ? V IN ?
Substituting V OUT =1.8V, V IN =4.2V, ΔI L =180mA
to 240mA (30% to 40%) and f=1.3MHz gives
A 3.3μH inductor can be chosen with this
application. An inductor of greater value with
less equivalent series resistance would provide
better efficiency. The CIN capacitor requires
an RMS current rating of at least I LOAD(MAX) /2
and low ESR. In most cases, a ceramic
capacitor will satisfy this requirement.
Fig. 24: VOUT Ripple Voltage
for VIN decreasing close to V OUT
? 2012 Exar Corporation
9/11
Rev. 2.2.0
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