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PDF ISL97519A Data sheet ( Hoja de datos )
| Número de pieza | ISL97519A | |
| Descripción | 600kHz/1.2MHz PWM Step-Up Regulator | |
| Fabricantes | Intersil | |
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600kHz/1.2MHz PWM Step-Up Regulator
ISL97519A
The ISL97519A 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. Two selectable
frequencies, 600kHz and 1.2MHz, allow trade offs between
smaller components 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, make it an ideal device for portable
equipment and TFT-LCD displays.
The ISL97519A 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.
Features
• >90% Efficiency
• 2.0A, 200mΩ Power MOSFET
• 2.3V to 5.5V Input
• 1.1*VIN 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 (RoHS compliant)
• Halogen Free
Applications
• TFT-LCD displays
• DSL modems
• PCMCIA cards
• Digital cameras
• GSM/CDMA phones
• Portable equipment
• Handheld devices
VDD
REFERENCE
GENERATOR
FSEL
OSCILLATOR
EN SS
SHUTDOWN
AND START-UP
CONTROL
COMPARATOR
PWM LOGIC
CONTROLLER
CURRENT
SENSE
GM
AMPLIFIER
FET
DRIVER
LX
GND
FB
COMP
February 16, 2012
FN6683.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2008, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL97519A
Typical Performance Curves (Continued)
VO = 12V
IO = 50mA to 300mA
VIN = 3.3V
fs = 1.2MHz
FIGURE 7. TRANSIENT RESPONSE
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
1.0
0.9
0.8 870mW
0.7
0.6
0.5
0.4
θJA = +1M1S5O°CP/W8
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 ISL97519A 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 delivers 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
5
FIGURE 8. SS DELAY AND LX DELAY DURING EN = VDD
START- UP
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
0.6
0.5
486mW
0.4
0.3
0.2
θJA = +2M0S6O°CP/8W
0.1
0.0
0
25 50 75 85 100
AMBIENT TEMPERATURE (°C)
125
FIGURE 10. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
boost converter operates in two cycles. During the first cycle,
as shown in Figure 12, the internal power FET turns 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 shown in
Equation 1:
ΔIL1 = ΔT1 × V---L-I--N--
ΔT1 = -F---SD---W---
D = Duty Cycle
ΔVO = C-I--O-O---U-U---T-T × ΔT1
(EQ. 1)
FN6683.3
February 16, 2012
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ISL97519A.PDF ] | |
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