EL7581IREZ Intersil, EL7581IREZ Datasheet - Page 14
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EL7581IREZ
Manufacturer Part Number
EL7581IREZ
Description
IC CONV DC/DC 3-CHAN 20-HTSSOP
Manufacturer
Intersil
Datasheet
1.EL7581IREZ.pdf
(17 pages)
Specifications of EL7581IREZ
Applications
Converter, TFT, LCD
Voltage - Input
2.7 ~ 14 V
Number Of Outputs
2
Voltage - Output
5 ~ 17 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
EL7581IREZ
Manufacturer:
INTERSIL
Quantity:
20 000
Part Number:
EL7581IREZ-T13
Manufacturer:
INTERSIL
Quantity:
20 000
Two-Stage Positive Charge Pump Circuit
The maximum V
R
Where V
Negative Charge Pump Design Considerations
The criteria for the negative charge pump is similar to the
positive charge pump. For a single stage charge pump, the
maximum V
Similar to positive charge pump, if additional stage is
required, the LX switching signal is recommended to drive
the additional charge pump diodes. The figure on the next
page shows a two stage negative charge pump circuit.
V
----------------------------------------------- -
0.5
V
V
ON
11
ON
OFF
×
and R
(
F
max
=
(
max
S
V
1
×
FPB
FBP
)
C
12
)
≤
OUT1
OFF
≥
2
×
set the V
is nominal 1.310V.
I
×
OUT
R
-------------------------- -
V
11
ON
output voltage is:
+
DDP
R
N
×
+
11
output voltage for N+1 stage charge pump is:
2
×
R
- I
×
12
V
ON
(
LX
OUT
R
ONN
output voltage:
(
max
×
14
2
+
) - N
×
R
(
1.265V
ONP
R
R
R
V
V
+
DRNP
-
ONN
×
DDP
ONP
ONN
SSP
FBP
)
2
+
×
+
2 V
+
-
V
R
×
DIODE
ONP
DIODE
) - 2
C
+
CPP
I
OUT
×
- I
V
OUT
DIODE
×
------------------------------------------- -
0.5
×
EL7581
C
------------------------------------------- -
0.5
OUT1
×
- I
V
(5V-17V)
F
BOOST
×
OUT
S
1
F
×
S
C
1
×
×
CPP
C
------------------------------------------- -
0.5
CPN
×
+
V
F
I
OUT
LX
- I
S
1
C
×
OUT
CPP
C
C
×
OUT1
CPP
----------------------------------------------- -
0.5
×
----------------------------------------------- -
0.5
×
- I
F
×
OUT
S
1
F
×
S
C
1
×
×
OUT1
C
R
R
OUT2
12
11
V
ON
- V
DDN