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| 型号： | ISL98012IUZ-TK |
| 厂商： | Intersil |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.6A 10MSOP |
| 标准包装： | 1,000 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 4.5 V ~ 17 V |
| 输入电压： | 1.8 V ~ 13.2 V |
| 频率 - 开关： | 600kHz ~ 750kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
| 其它名称： | ISL98012IUZ-TK-ND |
ISL98012
completely dried out before the MOSFET is turned on again.
The input voltage source, the inductor, and the MOSFET and
The inductor has peak and average current decided by
Equations 4 and 5:
output diode parasitic capacitors form a resonant circuit.
Oscillation will occur in this period. This oscillation is normal
and will not affect regulation.
At very low load, the MOSFET will skip pulses sometimes;
this is normal.
2
Δ I L
I LPK = I LAVG + --------
I O
1 – D
I LAVG = -------------
(EQ. 4)
(EQ. 5)
Current Limit
The MOSFET current limit is nominally 1.4A and guaranteed
1A. This restricts the maximum output current I OMAX based
on Equation 1:
The inductor should be chosen to handle this current.
Furthermore, due to fixed internal compensation, it is
recommended that maximum inductance of 10μH and 15μH
be used in the 5V and 12V or higher output voltage,
respectively.
I OMAX = ? 1 – -------- ? × ---------
V O
? 2 ?
Δ I L V IN
(EQ. 1)
The output diode has an average current of I O and peak
current is the same as the inductor's peak current. A
where:
? Δ I L is the inductor peak-to-peak current ripple and is
decided by Equation 2:
Schottky diode is recommended and it should be able to
handle those currents.
The output voltage ripple can be calculated as Equation 6:
Δ I L = --------- × -----
f S
Δ V O = ---------------------- + I LPK × ESR
V O – V IN
V O
V IN D
L
? D is the MOSFET turn-on ratio and is decided by
Equation 3:
D = ------------------------
(EQ. 2)
(EQ. 3)
I O × D
F S × C O
Where:
? C O is the output capacitance.
? The ESR is the output capacitor ESR value.
(EQ. 6)
? f S is the switching frequency
Table1 gives typical values:
TABLE 1. MAX CONTINUOUS OUTPUT CURRENTS
Low ESR capacitors should be used to minimize output
voltage ripple. Multilayer ceramic capacitors (X5R and X7R)
are preferred for output capacitors since they have a low
ESR and small packages. Tantalum capacitors also can be
used, but they take more board space and have higher ESR.
V IN
(V)
2
2
2
V O
(V)
5
9
12
L
(μH)
10
10
10
f S
(kHz)
750
750
750
I OMAX
(mA)
360
190
140
A minimum of 22μF output capacitor is sufficient for high
output current application. For lower output current, the
output capacitor can be smaller, like 4.7μF. The capacitor
should always have enough voltage rating. In addition to the
voltage rating, the output capacitor should also be able to
handle the RMS current, which is given by Equation 7:
?
?
Δ I L
( 1 – D ) × ? D + -------------------- × ------ ? × I LAVG
3.3
3.3
3.3
5
9
12
10
10
10
750
750
750
600
310
230
I CORMS =
? 2 12 ?
2
? I LAVG ?
1
(EQ. 7)
5
5
9
12
9
12
12
15
10
10
10
10
750
750
750
750
470
340
630
670
Output Voltage
An external resistor divider is required to divide the output
voltage down to the nominal reference voltage. The current
drawn by the resistor network should be limited to maintain
the overall converter efficiency. The maximum value of the
resistor network is limited by the feedback input bias current
Component Considerations
It is recommended that C IN is larger than 10μF.
Theoretically, the input capacitor has a ripple current of Δ I L .
Due to high-frequency noise in the circuit, the input current
ripple may exceed the theoretical value. A larger capacitor
will reduce the ripple further.
8
and the potential for noise being coupled into the feedback
pin. A resistor network less than 300k Ω is recommended.
FN6654.1
December 8, 2010
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