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ISL97519A Datasheet(PDF) 5 Page - Intersil Corporation

Part No. ISL97519A
Description  600kHz/1.2MHz PWM Step-Up Regulator
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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ISL97519A Datasheet(HTML) 5 Page - Intersil Corporation

   
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5
FN6683.2
June 30, 2008
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 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:
FIGURE 7. TRANSIENT RESPONSE
FIGURE 8. SS DELAY AND LX DELAY DURING EN = VDD
START- UP
FIGURE 9. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
FIGURE 10. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
Typical Performance Curves (Continued)
VO = 12V
fs = 1.2MHz
VIN = 3.3V
IO = 50mA to 300mA
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
1.0
0.9
0.6
0.4
0.3
0.2
0.1
0
0
255075
100
125
AMBIENT TEMPERATURE (°C)
85
870mW
θ
JA =
+1
15
°C
/W
M
SO
P8
0.8
0.5
0.7
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
0.6
0.4
0.3
0.2
0.1
0.0
0
25
50
75
100
125
AMBIENT TEMPERATURE (°C)
85
486mW
θ
JA =
+2
06
°C
/W
M
SO
P8
0.5
ΔI
L1
ΔT1
V
IN
L
---------
×
=
ΔT1
D
F
SW
------------
=
D
Duty Cycle
=
ΔV
O
I
OUT
C
OUT
----------------
ΔT
1
×
=
(EQ. 1)
ISL97519A


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