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This IC is based on a unique SANYO idea and is a high-efficiency charge pump IC that was newly-developed taking advantage
of CMOS technologies that fuse SANYO's circuit and process technologies. This IC is optimal for power supplies in portable
electronic equipment.
This IC introduces technologies that completely overturn the previous common knowledge that although charge pump circuits
were low noise, they suffered from poor efficiency.
2928
Support for High-Resolution CCDs
New Charge Pump ICs
CCD image sensors require a high drive voltage of 10 to 20 V. This 10 to 20 V level is created by stepping up the 3 V
power supply level.
Since conventional charge pump voltage step-up technologies suffer from increased power loss when used to step up
the original voltage by over three times, their use in cell phones was problematic.
SANYO has, however, discovered a way of fusing their high level analog circuit and device technologies to overcome
this problem.
This new charge pump technology can step up a regulated voltage by a factor of three or higher with an efficiency as
high as 70%. Furthermore it can provide an output current of several tens of mA.
SANYO was the first in the industry to develop a high-performance charge pump.
This new charge pump technology can provide both positive and negative stepped up levels, can be combined into
multiple stages, and can provide multiple output levels. Thus this circuit technology is optimal for use in future camera
cell phones that include a megapixel-class CCD image sensor.
● High efficiency
(Prior to the regulator: 90 to 95 %)
● Coilless, low noise
● Supports high output current designs
● The only external components are thin form
capacitors (no coils or diodes required)
● Can provide both positive and negative
stepped-up outputs
● Supports fine step-up step sizes
+0.5 × n × V
DD
-0.5 × n × V
DD
(n: integer)
● Optimal for use as the power supply in
portable equipment
Clock
Clock generator & driver
C1 C2 Cn Cn+1
V
O
V
DD
Regulator
Charge pump
V
IN
V
OUT
Dependency of efficiency on the supply voltage
90
Output current, I
OUT
(mA)
2.9 V
3.1 V
3.3 V
3.5 V
3.7 V
V
DD
=3.3V
At I
OUT
=50 mA, efficiency=80.6%
At I
OUT
=100 mA, efficiency=72.0%
Maximum efficiency: 80.8%
Efficiency (%)
80
70
60
50
40
30
20
10
0
0102030405060708090100
Output current, I
OUT
(mA)
Positive step-up voltage vs. output current
Output current, I
OUT
(mA)
Negative step-up voltage vs. output current
■Plus step-up ■Minus step-up
IOUT=-50 mA
At V
DD=2.9 V, VPP=7.78 V
At V
DD=3.3 V, VPP=9.03 V
At V
DD=3.7 V, VPP=10.26 V
Output voltage, V
OUT
(V)
Output voltage, V
OUT
(V)
12
10
8
6
4
2
0
0102030405060708090100
IOUT=50 mA
At V
DD=2.9 V, Vbb=-7.44 V
At V
DD=3.3 V, Vbb=-8.71 V
At V
DD=3.7 V, Vbb=-9.96 V
-12
-10
-8
-6
-4
-2
-0
0102030405060708090100
2.9 V
2.9 V
3.3 V
3.3 V
3.7 V
3.7 V
Output voltages from positive and negative step-up operation
Sample characteristics of a high-current
charge pump (single supply voltage→±3×)
● Regulates a 3.3 to 4.5 V battery level
to 3.1 V and steps up that level 3×
and 6× using a charge pump, to
provide the two regulated power
supply levels required by the CCD
image sensor.
●
VH = +15.0 V
●
VL = -8 V
● Two independent charge pump
systems are provided for VH and VL
● Built-in regulators for the analog
system power supply, vertical driver
system, and DSP core
3 V
Charge pump
CCD
+15 V(10 mA)
-8 V(5 mA)
3 V
Charge pump LTPS
+7 V(500 µA)
-8 V(5 mA)
3V
Charge pump White LED
+4.5 V(100 mA)
The ability to provide a stepped-up voltage with low noise makes this circuit optimal for
embedding in modules.
30
24
23
15
19
7
26
6
4
5
32
33
1
2
27
29
2528
14
22
16
21
18
20
11
12
34
44
35
43
36
42
37
41
38
40
31
39
8
10
9
13
17
3
3.3 to 4.5 V
1 µF
OUT2
VBAT2 VBAT1
VBAT3
VBAT4
OUT3
VSS2
OUT4
VDD3
VSS4
VSS5
C21A
C21B
C22A
C22B
C23B
VL_C24
(VDD✕3)
(VDD✕2)
(VDD✕3)
(VDD✕1)
VL_C25
STBY
SLEEP
EN VDD4 VSS7
NC
VH_C17
VH_C16
VSS6
VSS3
C15B
C15A
C14B
C14A
C13B
C13A
C12B
C12A
C11B
C11A
VSS1
OUT1
VDD1,2,3,4
VDD1
VDD2
C23A
FVREF
1 µF
1 µF
1µF
0.1 µF
0.47 µF
0.47 µF
0.47 µF
1 µF
1 µF
3.1 V / 100 mA
LDO
1.8 V / 100 mA
LDO
Bandgap
voltage
reference
1.19 V
Timing
generator
Sequence
generator
-8-V Reg
15-V Reg
1/2 Divider
1.2-MHz
Oscillator
3.1 V / 1 mA
3.1 V / 100 mA
LDO
(VDD✕6)
(VDD✕5)
0.22 µF
1 µF
1 µF
(VDD✕4)
0.22 µF
(VDD✕3)
0.22 µF
(VDD✕2)
0.22 µF
(VDD✕1)
0.22 µF
1 µF
-3 times
step up
circuit
6 times
step up
circuit
* Values in parentheses are actual
applied voltages to the capacitor.
Note: Short OUT1 to VDD1 through VDD4.
Features of New Charge Pump ICs Charge pump power supply application
CCD Power Supply IC for Camera Cell Phones
Under
development
LV5711FN
IPBlock diagram
Block diagram