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PDF ISL97645A Data sheet ( Hoja de datos )
| Número de pieza | ISL97645A | |
| Descripción | Boost + VON Slice + VCOM + Reset | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Data Sheet
October 21, 2010
ISL97645A
FN6353.1
Boost + VON Slice + VCOM + Reset
The ISL97645A represents an integrated DC/DC regulator
for monitor and notebook applications with screen sizes up
to 20”. The device integrates a boost converter for
generating AVDD, a VON slice circuit, and a high performance
VCOM amplifier.
The boost converter features a 2.6A FET and has user
programmable soft-start and compensation. With efficiencies
up to 92%, the AVDD is user selectable from 7V to 20V.
The VON slice circuit can control gate voltages up to 30V.
High and low levels are programmable, as well as discharge
rate and timing.
The supply monitor can be used to monitor the input voltage
to prevent low voltage operation.
The integrated VCOM features high speed and drive
capability. With 30MHz bandwidth and 50V/µs slew rate, the
VCOM amplifier is capable of driving 400mA peaks, and
100mA continuous output current.
Ordering Information
PART
NUMBER
(Notes 1, 2, 3)
TEMP.
PART RANGE
MARKING (°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL97645AIRZ 976 45AIRZ -40 to +85 24 Ld 4x4 QFN L24.4x4D
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details
on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-
free material sets, molding compounds/die attach materials, and
100% matte tin plate plus anneal (e3 termination finish, which is
RoHS compliant and compatible with both SnPb and Pb-free
soldering operations). Intersil Pb-free products are MSL classified at
Pb-free peak reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device
information page for ISL97645A. For more information on
MSL please see techbrief TB363.
Features
• 2.7V to 5.5V Input
• 2.6A Integrated Boost for Up to 20V AVDD
• Integrated VON Slice
• RESET signal generated by Supply Monitor
• 600kHz/1.2MHz fS
• VCOM Amplifier
- 30MHz BW
- 50V/µs SR
- 400mA Peak Output Current
• UV and OT Protection
• 24 Ld 4x4 QFN
• Pb-Free (RoHS Compliant)
Applications
• LCD Monitors (15”+)
• Notebook Display (up to 16”)
Pinout
ISL97645A
(24 LD 4x4 QFN)
TOP VIEW
24 23 22 21 20 19
GND 1
18 LX
VGH_M 2
17 VIN2
VFLK 3
16 FREQ2
VDPM 4
15 COMP
VDD1 5
14 SS
VDD2 6
13 RESET
7 8 9 10 11 12
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007, 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL97645A
Electrical Specifications
VIN = ENABLE = 5V, VDD1 = VDD2 = 14V, VGH = 25V, AVDD = 10V, TA = -40°C to +85°C
Unless Otherwise Noted. Boldface limits apply over the operating temperature range,
-40°C to +85°C. (Continued)
SYMBOL
PARAMETER
TEST CONDITION
MIN
(Note 6)
TYP
MAX
(Note 6) UNIT
SUPPLY MONITOR
VIH_VDIV
VIL_VDIV
ICD2
VDIV High Threshold
VDIV Low Threshold
CD2 Charge Current
VDIV rising
VDIV falling
1.18 V
1.05 V
10 µA
RIL_RESET
RESET Pull-Down Resistance
750 Ω
tDELAY_RESET
RESET Delay on the Rising Edge
121.5k*CD
s
NOTE:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
I
Typical Performance Curves
100
fOSC = 650kHz
90
80 fOSC = 1.2MHz
70
60
50
40
30
20
10
0
0 200 400 600 800 1000
IAVDD (mA)
FIGURE 1. AVDD EFFICIENCY vs IAVDD
1200
0
-0.1
-0.2
-0.3 fOSC = 650kHz
-0.4
-0.5
-0.6 fOSC = 1.2MHz
-0.7
-0.8
-0.9
0
200 400 600 800 1000 1200
IAVDD (mA)
FIGURE 2. AVDD LOAD REGULATION vs IAVDD
10.5
10.45
10.4
10.35
AVDD 150mA
AVDD 500mA
10.3
10.25
10.2
10.15
3
3.5 4.0 4.5 5.0 5.5
VIN (V)
FIGURE 3. LINE REGULATION AVDD vs VIN
6.0
L = 10µH, COUT = 40µF, CCOMP = 2.2nF, RCOMP = 10k
IAVDD
AVDD (AC COUPLED)
FIGURE 4. BOOST CONVERTER TRANSIENT RESPONSE
5 FN6353.1
October 21, 2010
5 Page 
ISL97645A
Inductor
The boost inductor is a critical part which influences the
output voltage ripple, transient response, and efficiency.
Values of 3.3µH to 10µH are used to match the internal
slope compensation. The inductor must be able to handle
the following average and peak current are in Equation 5:
ILAVG
=
----I--O-------
1–D
ILPK
=
IL
AVG
+
-Δ----I--L-
2
(EQ. 5)
Some inductors are recommended in Table 3.
TABLE 3. BOOST INDUCTOR RECOMMENDATION
DIMENSIONS
INDUCTOR
(mm)
MFG
PART NUMBER
6.8µH/3APEAK 7.3x6.8x3.2
10µH/4APEAK 8.3x8.3x4.5
5.2µH/4.55APEAK 10x10.1x3.8
TDK
RLF7030T-6R8N3R0
Sumida CDR8D43-100NC
Cooper CD1-5R2
Bussmann
Rectifier Diode
A high-speed diode is necessary due to the high switching
frequency. Schottky diodes are recommended because of
their fast recovery time and low forward voltage. The reverse
voltage rating of this diode should be higher than the
maximum output voltage. The rectifier diode must meet the
output current and peak inductor current requirements. The
following table is some recommendations for boost converter
diode.
TABLE 4. BOOST CONVERTER RECTIFIER DIODE
RECOMMENDATION
DIODE
SS23
VR/IAVG RATING
30V/2A
PACKAGE
MFG
SMB
Fairchild
Semiconductor
MBRS340
40V/3A
SMC
International
Rectifier
SL23
30V/2A
SMB
Vishay
Semiconductor
For low ESR ceramic capacitors, the output ripple is
dominated by the charging and discharging of the output
capacitor. The voltage rating of the output capacitor should
be greater than the maximum output voltage.
Note: Capacitors have a voltage coefficient that makes their
effective capacitance drop as the voltage across then
increases. COUT in the equation above assumes the
effective value of the capacitor at a particular voltage and not
the manufacturer’s stated value, measured at 0V.
Table 5 shows some selections of output capacitors.
TABLE 5. BOOST OUTPUT CAPACITOR RECOMMENDATION
CAPACITOR SIZE MFG
PART NUMBER
10µF/25V
1210 TDK
C3225X7R1E106M
10µF/25V
1210 Murata GRM32DR61E106K
Compensation
The boost converter of ISL97645A can be compensated by
a RC network connected from CM1 pin to ground. 4.7nF and
10k RC network is used in the demo board. The larger value
resistor and lower value capacitor can lower the transient
overshoot, however, at the expense of stability of the loop.
Cascaded MOSFET Application
An 20V N-Channel MOSFET is integrated in the boost
regulator. For the applications where the output voltage is
greater than 20V, an external cascaded MOSFET is needed
as shown in Figure 14. The voltage rating of the external
MOSFET should be greater than AVDD.
VIN AVDD
INTERSIL
ISL97645A
LX
FB
Output Capacitor
The output capacitor supplies the load directly and reduces
the ripple voltage at the output. Output ripple voltage
consists of two components:
1. the voltage drop due to the inductor ripple current flowing
through the ESR of output capacitor.
2. charging and discharging of the output capacitor.
VRIPPLE
=
ILP
K
×
E
S
R
+
V-----O-----–-----V----I--N--
VO
×
------I--O-------
COUT
×
-1--
fs
(EQ. 6)
FIGURE 14. CASCADED MOSFET TOPOLOGY FOR HIGH
OUTPUT VOLTAGE APPLICATIONS
11 FN6353.1
October 21, 2010
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL97645A.PDF ] | |
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