參數(shù)資料
型號: ISL97516IUZ-T
廠商: INTERSIL CORP
元件分類: 穩(wěn)壓器
英文描述: 600kHz/1.2MHz PWM Step-Up Regulator
中文描述: 2 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO8
封裝: 1.10 MM HEIGHT, ROHS COMPLIANT, MSOP-8
文件頁數(shù): 5/9頁
文件大小: 318K
代理商: ISL97516IUZ-T
5
FN9261.2
March 16, 2007
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 C
SS
capacitor. The EN pin
allows the user to completely shutdown the device.
Boost Converter Operations
Figure 10 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 11, 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
V
IN
and the inductor current ramps up in a rate of V
IN
/L, L is
the inductance. The inductance is magnetized and energy is
stored in the inductor. The change in inductor current is:
FIGURE 7. TRANSIENT RESPONSE
FIGURE 8. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
FIGURE 9. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
Typical Performance Curves
(Continued)
V
O
= 12V
f
s
= 1.2MHz
V
IN
= 3.3V
I
O
= 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
25
50
75
100
125
AMBIENT TEMPERATURE (°C)
P
85
870mW
θ
JA
=+115°CW
MSOP8
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)
P
85
486mW
θ
JA
=+206°CW
MSOP8
0.5
Δ
I
L1
Δ
T1
V
---------
×
=
Δ
T1
SW
------------
=
D
Duty Cycle
=
Δ
V
O
I
OUT
---------------
Δ
T
1
×
=
(EQ. 1)
相關(guān)PDF資料
PDF描述
ISL97516IUZ-TK 600kHz/1.2MHz PWM Step-Up Regulator
ISL97536 Monolithic 1A Step-Down Regulator with Low Quiescent Current
ISL97536IUZ Monolithic 1A Step-Down Regulator with Low Quiescent Current
ISL97536IUZ-T Monolithic 1A Step-Down Regulator with Low Quiescent Current
ISL97536IUZ-TK Monolithic 1A Step-Down Regulator with Low Quiescent Current
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