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参数资料
| 型号： | LM2664MDC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 80 kHz SWITCHING FREQ-MAX, UUC |
| 封装： | DIE |
| 文件页数： | 11/12页 |
| 文件大小： | 340K |
| 代理商： | LM2664MDC |
Other Applications (Continued)
Regulating V
OUT
It is possible to regulate the negative output of the LM2664
by use of a low dropout regulator (such as LP2980). The
whole converter is depicted in Figure 6. This converter can
give a regulated output from 1.8V to 5.5V by choosing the
proper resistor ratio:
V
out = Vref (1+R1/R2)
where, V
ref = 1.23V
Note that, the following conditions must be satisfied simulta-
neously for worst case design:
V
in_min >Vout_min +Vdrop_max (LP2980)
+I
out_max xRout_max (LM2664)
V
in_max < Vout_max +Vdrop_min (LP2980)
+I
out_min xRout_min (LM2664)
DS100031-12
FIGURE 5. Combined Voltage Doubler and Inverter
DS100031-24
FIGURE 6. Combining LM2664 with LP2980 to Make a Negative Adjustable Regulator
LM2664
www.national.com
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