EL7581IRE Intersil, EL7581IRE Datasheet - Page 13
![IC CONV DC/DC 3-CHAN 20-HTSSOP](/photos/28/16/281692/20-tssop_mdp_sml.jpg)
EL7581IRE
Manufacturer Part Number
EL7581IRE
Description
IC CONV DC/DC 3-CHAN 20-HTSSOP
Manufacturer
Intersil
Datasheet
1.EL7581IREZ.pdf
(17 pages)
Specifications of EL7581IRE
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
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
EL7581IRE
Manufacturer:
ELANTEC
Quantity:
50 000
Company:
Part Number:
EL7581IRE-T13
Manufacturer:
VIA
Quantity:
17
Part Number:
EL7581IRE-T7
Manufacturer:
EL
Quantity:
20 000
Part Number:
EL7581IREZ
Manufacturer:
INTERSIL
Quantity:
20 000
Part Number:
EL7581IREZ-T13
Manufacturer:
INTERSIL
Quantity:
20 000
Positive Charge Pump Design Considerations
A single stage charge pump is shown above. The maximum V
where:
• R
If additional stage is required, the LX switching signal is
recommended to drive the additional charge pump diodes.
The drive impedance at the LX switching is typically 150mΩ.
The figure on the next page illustrates an implementation for
two-stage positive charge pump circuit.
V
ON
voltage levels. For 12V supply, R
6V supply, R
V
ONN
OFF
(
max
5V to
and R
17V
)
≤
2
×
R
ON
ONP
21
V
R
C
3.3µF
DDCPP
22
OUT2
is typically 45Ω.
resistance values depend on the V
0.1µF
C
V
(1.32V)
- I
CPN
REF
OUT
13
×
V
DRVN
V
FBN
DDN
2
SSN
R
R
×
ON
ONP
ONN
(
R
ONN
is typically 33Ω. For
+
R
+
-
ONP
R
) - 2
ON
is 30 - 40Ω for V
DDP
×
V
DIODE
EL7581
ON
OSC
- I
output voltage is determined by the following equation:
OUT
DD
6V to 17V
×
------------------------------------------- -
0.5
×
F
S
1
×
C
+
-
CPP
+
-
- I
V
R
R
FBP
OUT
ONP
ONN
DRVP
V
V
FBP
DDP
SSP
×
----------------------------------------------- -
0.5
×
F
S
1
×
C
0.1µF
OUT1
R
12
C
CPP
R
11
C
2.2µF
OUT1
5V to
17V
V
ON