ISL97650ARTZ-T Intersil, ISL97650ARTZ-T Datasheet - Page 15

• Manufacturer Part Number: ISL97650ARTZ-T
• Description: IC LCD SUPPLY HP 4CHN 36-TQFN
• Manufacturer: Intersil

Specifications of ISL97650ARTZ-T

• Applications: LCD TV/Monitor
• Current - Supply: 250µA
• Voltage - Supply: 4 V ~ 14 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 36-TQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

In voltage doubler configuration, the maximum V
given by Equations 17, 18 and 19:
For Voltage Tripler:
V
Negative Charge Pump Design Consideration
The negative charge pump consists of an internal switcher
M1, M2 which drives external steering diodes D2 and D3 via
a pump capacitor (C12) to generate the negative V
supply. An internal comparator (A1) senses the feedback
voltage on FBN and turns on M1 for a period up to half a
CLK period to maintain V
0.2V. External feedback resistor R6 is referenced to V
V
V
V
ON
ON_MAX(3x)
ON_MAX(2x)
ON
output voltage is determined by Equation 19:
=
V
FBP
=
=
•
3
⎛
⎜
⎝
2
•
1
1.2MHz
(
•
+
V
(
0.9V
V
SUP
R
------ -
R
V
REF
8
9
SUP
⎞
⎟
⎠
–
(FBN)
V
–
DIODE
V
DIODE
15
in regulated operation at
)
–
)
CONTROL
2 I
ERROR
FB
–
•
2 I
•
OUT
OUT
•
(
•
3 r
FIGURE 16. V
(
•
2 r
ON
•
ONH
OFF
ONH
is as
REF
+
VSUP
2 r
+
.
•
r
(EQ. 18)
ISL97650
ONL
(EQ. 17)
(EQ. 19)
M1
ON
ONL
)
FUNCTION DIAGRAM
VSUP
)
VSUP
D3
M3
M5
M2
M4
Faults on V
are detected by comparator (A2) and cause the fault
detection system to start a fault ramp on C
cause the chip to power down if present for more than the
time TFD (see "Electrical Specification" section and also
Figure “V
D2
ON
D1
OFF
FUNCTION DIAGRAM” on page 15).
which cause V
C1-
C1+
POUT
C2+
C2-
FBP
C21
C22
C7
C8
FBN
External Connections
C14
and Components
to rise to more than 0.4V,
x2 Mode
x3 Mode
Both
R8
R9
DLY
pin which will
April 17, 2009
FN9198.4