LT1054_06 Datasheet, PDF (17/27 Pages) Texas Instruments – SWITCHED-CAPACITOR VOLTAGE CONVERTERS WITH REGULATORS

LT1054
SWITCHEDĆCAPACITOR VOLTAGE CONVERTERS
WITH REGULATORS
SLVS033F − FEBRUARY 1990 − REVISED NOVEMBER 2004
APPLICATION INFORMATION
VIN
3.5 V to 15 V
+
2.2 µF
+
10 µF
1
FB/SD
8
VCC
2
CAP+
7
OSC
+ 10 µF
3
LT1054 #1 ₆
GND VREF
4
CAP−
VOUT ⁵
VOUT
SET
R1
40 kΩ
1
2
+ 10 µF
3
4
+
10 µF
FB/SD
VCC ⁸
CAP+ OSC
LT1054 #2
GND VREF
7
HP5082-2810
CAP+ of
LT1054 #1
6
20 kΩ
CAP− VOUT ⁵
1N4002
10 µF
+
0.002 µF ⁺
1N4002
1N4002
1N4002
R2
1N4002
500 kΩ
VOUT
100 µF
+
VIN = 3.5 V to 15 V
IOUT ≅ 100 mA MAX
ǒ Ǔ ǒ^{Ť Ť} Ǔ ^{VOUT MAX ≈ −2 VIN + [LT1054 Voltage Loss +2 (VDiode)]}
R2 + R1
Ť Ť _VOUT
VREF
2
*
40
mV
)
1
V
+ R1
OUT
1.21 V
)
1
Pin numbers shown are for the P package.
Figure 23. 100-mA Regulating Negative Doubler
+ ^{10 µF}
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17