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PDF ISL97516 Data sheet ( Hoja de datos )
| Número de pieza | ISL97516 | |
| Descripción | PWM Step-Up Regulator | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
December 22, 2006
ISL97516
FN9261.1
600kHz/1.2MHz PWM Step-Up Regulator
The ISL97516 is a high frequency, high efficiency step-up
voltage regulator operated at constant frequency PWM
mode. With an internal 2.0A, 200mΩ MOSFET, it can deliver
up to 1A output current at over 90% efficiency. The
selectable 600kHz and 1.2MHz allows smaller inductors and
faster transient response. An external compensation pin
gives the user greater flexibility in setting frequency
compensation allowing the use of low ESR Ceramic output
capacitors.
When shut down, it draws <1µA of current and can operate
down to 2.3V input supply. These features along with
1.2MHz switching frequency makes it an ideal device for
portable equipment and TFT-LCD displays.
The ISL97516 is available in an 8 Ld MSOP package with a
maximum height of 1.1mm. The device is specified for
operation over the full -40°C to +85°C temperature range.
Pinout
ISL97516
(8 LD MSOP)
TOP VIEW
COMP 1
FB 2
EN 3
GND 4
8 SS
7 FSEL
6 VDD
5 LX
Features
• >90% Efficiency
• 2.0A, 200mΩ Power MOSFET
• 2.3V to 5.5V Input
• Up to 25V Output
• 600kHz/1.2MHz Switching Frequency Selection
• Adjustable Soft-Start
• Internal Thermal Protection
• 1.1mm Max Height 8 Ld MSOP Package
• Pb-free Plus Anneal Available (RoHS compliant)
Applications
• TFT-LCD displays
• DSL modems
• PCMCIA cards
• Digital cameras
• GSM/CDMA phones
• Portable equipment
• Handheld devices
Ordering Information
PART NUMBER PART
(Note)
MARKING
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL97516IUZ-T
7516Z 8 Ld MSOP
MDP0043
ISL97516IUZ-TK
7516Z 8 Ld MSOP
MDP0043
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  
ISL97516
Typical Performance Curves (Continued)
VO = 12V
IO = 50mA to 300mA
VO = 12V
IO = 50mA to 300mA
VIN = 3.3V
fs = 600kHz
VIN = 3.3V
fs = 1.2MHz
FIGURE 7. TRANSIENT RESPONSE
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
1
0.9
0.8 870mW
0.7
0.6
0.5
θJA =11M5S°OC/PW8
0.4
0.3
0.2
0.1
0
0
25
50
75 85 100
125
AMBIENT TEMPERATURE (°C)
FIGURE 9. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
Applications Information
The ISL97516 is a high frequency, high efficiency boost
regulator operated at constant frequency PWM mode. The
boost converter stores energy from an input voltage source
and deliver it to a higher output voltage. The input voltage
range is 2.3V to 5.5V and output voltage range is 5V to 25V.
The switching frequency is selectable between 600kHz and
1.2MHz allowing smaller inductors and faster transient
response. An external compensation pin gives the user
greater flexibility in setting output transient response and
tighter load regulation. The converter soft-start characteristic
can also be controlled by external CSS capacitor. The EN pin
allows the user to completely shutdown the device.
Boost Converter Operations
Figure 11 shows a boost converter with all the key
components. In steady state operating and continuous
conduction mode where the inductor current is continuous,
the boost converter operates in two cycles. During the first
cycle, as shown in Figure 12, the internal power FET turns
5
FIGURE 8. TRANSIENT RESPONSE
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
0.6
0.5
486mW
0.4
0.3
0.2
θJA =2M06S°OCP/W8
0.1
0
0
25
50
75 85 100
125
AMBIENT TEMPERATURE (°C)
FIGURE 10. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
on and the Schottky diode is reverse biased and cuts off the
current flow to the output. The output current is supplied
from the output capacitor. The voltage across the inductor is
VIN and the inductor current ramps up in a rate of VIN/L, L is
the inductance. The inductance is magnetized and energy is
stored in the inductor. The change in inductor current is:
ΔIL1
=
ΔT1 × -V----I--N--
L
ΔT1
=
-----D-------
FSW
D = Duty Cycle
ΔVO
=
--I--O----U----T---
COUT
×
ΔT1
(EQ. 1)
FN9261.1
December 22, 2006
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ISL97516.PDF ] | |
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