|
|
PDF ISL97646 Data sheet ( Hoja de datos )
| Número de pieza | ISL97646 | |
| Descripción | Boost + LDO + VON Slice + VCOM | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ISL97646 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
|
No Preview Available !
®
Data Sheet
December 21, 2006
ISL97646
FN6265.0
Boost + LDO + VON Slice + VCOM
The ISL97646 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, an integrated logic LDO 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 logic LDO includes a 350mA FET for driving the low
voltage needed by the external digital circuitry.
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 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.
Pinout
ISL97646
(24 LD 4x4 QFN)
TOP VIEW
24 23 22 21 20 19
GND 1
18 LX
VGH_M 2
17 VIN_2
VFLK 3
16 FREQ
VDPM 4
15 COMP
VDD_1 5
14 SS
VDD_2 6
13 VIN_1
7 8 9 10 11 12
Features
• 3V to 5.5V Input
• 2.6A Integrated Boost for Up to 20V AVDD
• Integrated VON Slice
• 350mA VLOGIC LDO
- 2.5V, 2.85V, 3.3V Output Voltage Selectable
• 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 Plus Anneal Available (RoHS Compliant)
Applications
• LCD Monitors (15”+)
• Notebook Display (up to 16”)
Ordering Information
TEMP.
PART NUMBER PART RANGE
(Note)
MARKING (°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL97646IRZ-T 97646IRZ -40 to +85 24 Ld 4x4 QFN L24.4x4D
6k pc Tape & Reel
ISL97646IRZ-TK 97646IRZ -40 to +85 24 Ld 4x4 QFN L24.4x4D
1k pc Tape & Reel
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
tin plate termination finish, which are 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.
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. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL97646
Electrical Specifications VIN1 = VIN2 = ENABLE = 5V, VDD1 = VDD2 = 14V, VGH = 25V, AVDD = 10V, TA = -40°C to +85°C
Unless Otherwise Noted. (Continued)
SYMBOL
PARAMETER
TEST CONDITION
MIN TYP MAX UNIT
ISC Output Short Circuit Current
SR Slew Rate
250 400
50
mA
V/µs
BW Gain Bandwidth
-3dB gain point
30 MHz
GATE PULSE MODULATOR
VGH
VGH Voltage
7 30 V
IVGH
VGH Input Current
VFLK = 0
RE = 33kΩ, VFLK = VDD1
260 µA
40 µA
VDD1
VDD1 Voltage
IVDD1
VDD1 Input Current
RONVGH
VGH to VGH_M On Resistance
IDIS_VGH
VGH_M Discharge Current (Note 1) RE = 33kΩ
TDEL
DELAY Time (Note 2)
CE = 470pF, RE = 33kΩ
NOTES:
1. Nominal discharge current = 300/(RE+5kΩ).
2. Nominal delay time = 4000*CE.
3
VGH - 2
V
-2 0.1 2 µA
70 Ω
8 mA
1.9 µs
5 FN6265.0
December 21, 2006
5 Page 
ISL97646
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:
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
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 zero volts.
The following table 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 ISL97646 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 15. The voltage rating of the external
MOSFET should be greater than AVDD.
VIN AVDD
INTERSIL
ISL97646
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: the voltage drop due to the
inductor ripple current flowing through the ESR of output
capacitor, and the 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)
For low ESR ceramic capacitors, the output ripple is
dominated by the charging and discharging of the output
FIGURE 15. CASCADED MOSFET TOPOLOGY FOR HIGH
OUTPUT VOLTAGE APPLICATIONS
Linear-Regulator (LDO)
The ISL97646 includes a LDO with adjustable output, and it
can supply current up to 350mA. The output voltage is
adjusted by connection of ADJ pin. When ADJ pin is
connected to ground, the output voltage is set to 3.3V; when
ADJ pin is floating, the output voltage is set to 2.85V, and
when ADJ pin is connected to LDO_OUT pin, the output
voltage is set to 2.5V.
11 FN6265.0
December 21, 2006
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ISL97646.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL97642 | TFT-LCD DC/DC | Intersil Corporation |
| ISL97644 | Boost + LDO + VON Slice + VCOM | Intersil Corporation |
| ISL97645 | Boost VON Slice VCOM | Intersil Corporation |
| ISL97645A | Boost + VON Slice + VCOM + Reset |  Intersil |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |