參數(shù)資料
型號(hào)： EL7583IREZ-T7
廠商： INTERSIL CORP
元件分類： 穩(wěn)壓器
英文描述： 3-Channel DC/DC Converter
中文描述： 1.75 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO20
封裝： ROHS COMPLIANT, MO-153, HTSSOP-20
文件頁數(shù)： 13/16頁
文件大?。?/td> 531K
代理商： EL7583IREZ-T7
13
FN7335.5
May 12, 2006
Two-Stage Negative Charge Pump Circuit
The maximum V
OFF
output voltage for N+1 stage charge pump is:
R
21
and R
22
determine V
OFF
output voltage:
where V
REF
is 1.310V.
Over-Temperature Protection
An internal temperature sensor continuously monitors the
die temperature. In the event that die temperature exceeds
the thermal trip point, the device will shut down and disable
itself. The upper and lower trip points are typically set to
130°C and 90°C respectively.
PCB Layout Guidelines
Careful layout is critical in the successful operation of the
application. The following layout guidelines are
recommended to achieve optimum performance.
V
REF
and V
DDB
bypass capacitors should be placed next
to the pins.
Place the boost converter diode and inductor close to the
LX pins.
Place the boost converter output capacitor close to the
PGND pins.
Locate feedback dividers close to their respected
feedback pins to avoid switching noise coupling into the
high impedance node.
Switching output PCB traces should not cross, or be laid
out adjacent to, feedback traces without using a grounded
shielding trace or layer. This is to prevent undesirable
switching interactions coupling into the feedback inputs.
Place the charge pump feedback resistor network after the
diode and output capacitor node to avoid switching noise.
All low-side feedback resistors should be connected
directly to V
SSB
. V
SSB
should be connected to the power
ground close at one point only.
A demo board is available to illustrate the proper layout
implementation.
-
+
V
SSN
DRVN
FBN
V
DDN
C
CPN
C
OUT2
V
LX
C
OUT2
R
21
R
22
C
CPN
V
REF
V
OFF
5V-17V
R
ONN
R
ONP
V
OFF
max
(
)
I
OUT
2
R
ONN
(
R
ONP
)
2
V
DIODE
- I
OUT
S
I
OUT
CPN
×
--------------------------------------------
×
×
+
+
×
×
- I
OUT
S
OUT2
-----------------------------------------------
-
V
DDN
×
- N
V
LX
max
(
)
N
2
V
DIODE
I
OUT
S
CPN
--------------------------------------------
×
+
×
×
+
×
0.5
F
S
C
OUT2
×
+
≥
V
OFF
-V
REF
R
22
---------
×
=
EL7583
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