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| 型号： | RE031 |
| 英文描述： | RE031 [Updated 3/03. 10 Pages] A dual mode Low Drop Out (LDO) voltage regulator macrocell with a fixed 2.5V output voltage. rated for loads of up to 5 mA. A typical application is real-time clock. backup battery supply in mobile terminals. |
| 中文描述： | RE031 [更新3月3日。 10页]双模式的低压差（LDO）稳压器电压固定的2.5V输出电压调节器宏单元。额定高达5毫安的负载。一个典型的应用是实时时钟。在移动终端的备用电池供电。 |
| 文件页数： | 4/8页 |
| 文件大小： | 123K |
| 代理商： | RE031 |
4
RE031 2.5V 5 mA LDO Voltage Regulator
2707B–PMGMT–03/03
Control Modes
Trimming
The bandgap inside RE031 has trimming capability, i.e., it is possible to compensate the
bandgap resistance variations due to process gradients through the TRIMBG20[9:0] sig-
nal. In order to reduce the sensitivity of the bandgap voltage to resistance varitions, the
trimming has been designed to compensate up to ±40% of resistance variations.
Application Example
A ceramic capacitor of 2.2 μF with ESR between 20 m
and 250 m
connected from
V
SAUV
to ground is needed for external compensation.
Figure 3.
Application Example
Table 2.
Truth Table
Resistance Variation
TRIMBG20[9:0]
+35% to +40%
1001000000
+20% to +35%
0101000000
+5% to +25%
0011000000
-5% to +5%
0000000000
-15% to -5%
0001100000
-22.5% to -15%
0001010000
-27.5% to -22.5%
0001001000
-32.5% to -27.5%
0001000100
-35% to -32.5%
0001000010
-37.5% to -35%
0001000001
-40% to -37.5%
0001000000
Description
Min
Typ
Max
Units
Capacitor (C
L
)
1.8
2.2
2.6
μF
Digital
Core
V
BAT2A
V
SAUVS
V
SAUV
TRIMBG20[9:0]
RST
Internal
Voltage Reference
Battery
Pack
V
SAUVC
V
BG20
GND2
C
L
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