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參數(shù)資料
| 型號(hào)： | AN8018 |
| 廠商： | Panasonic Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1.8-volt 2-channel step-up, step-down, or inverting DC-DC converter control IC |
| 中文描述： | 1.8伏雙通道升壓，降壓，或倒轉(zhuǎn)DC - DC轉(zhuǎn)換器控制IC |
| 文件頁(yè)數(shù)： | 9/26頁(yè) |
| 文件大?。?/td> | 268K |
| 代理商： | AN8018 |
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9
Voltage Regulators
AN8018SA
I
Usage Notes
[1] The loss P of this IC increases in proportion to the supply voltage. Use the IC so as not to exceed the allowable
power dissipation of package P
D
.
Reference formula:
P
=
V
O(SAT)1
×
I
OUT1
×
Du
1
+
(V
CC
V
BEQ2
)
×
I
SO(OUT)
×
Du
2
+ V
CC
×
I
CC
<
P
D
V
O(SAT)1
: Out1 terminal saturation voltage (0.5 V maximum at I
OUT1
=
30 mA)
I
OUT1
: Out1 terminal output current (
=
{V
CC
V
BEQ1
V
O(SAT)1
} / R
O1
)
Du
1
: Output1 duty ratio
V
BEQ2
: Base-emitter voltage of NPN transistor Q2
I
SO(OUT)
: Out2 terminal output source current
(set by RB, I
SO(OUT)
=
40 mA maximum at RB2
=
820
)
Du
2
: Output2 duty ratio
I
CC
: V
CC
terminal current (8.0 mA maximum but at V
CC
=
2.4 V)
[2] Since the output 2 of the AN8018SA is assuming the bipolar transistor driving, it is necessary to pay attention to
the following points when directly driving n-channel MOSFET.
1. Select an n-channel MOSFET having a low input
capacitance
The AN8018SA is of the constant-current (50 mA
maximum) output source-current type circuit assum-
ing the bipolar transistor driving. Also, its sink cur-
rent capability is around 80 mA maximum. For those
reason, it is necessary to pay attention to the increase
of loss due to the extension of the output rise time and
the output fall time.
If any problem arises, there is a method to solve it
by amplifying with inverters as shown in figure 1.
2. Select an n-channel MOSFET having a low gate
threshold value
The output high-level voltage of Out2 pin of the
AN8018SA is V
CC
1.0 V minimum, so that it is
necessary to select a low V
T
MOSFET having a suffi-
ciently low on-state resistance in accordance with the
using operating supply voltage.
If a larger V
GS
is desired, there is a method to apply
the double-voltage of the input to the IC's V
CC
pin by
using the transformer as shown in figure 2.
[3] In order to realize a low noise and high efficiency, a care should be taken in the following points in designing the
board layout.
1. The wiring for ground line should be taken as wide as possible and grounded separately from the power system.
2. The input filter capacitor should be arranged in a place as close to V
CC
and GND pin as possible so as not to
allow switching noise to enter into the IC inside.
3. The wiring between the Out terminal and switching device (transistor or MOSFET) should be as short as possible
to obtain a clean switching waveform.
4. In wiring the detection resistor of the output voltage, the wiring for the low impedance side should be longer.
[4] There is a case in which this IC does not start charging to the S.C.P. capacitor when the output is short-circuited
due to the malfunction of U.V.L.O. circuit biased by V
CC
that has ripples generated by turning on and off of the
switching transistor. The allowable range of the V
CC
ripple is as shown in the following figure. Reduce the V
CC
ripple
by inserting a capacitor near the V
CC
terminal and GND terminal of this IC so that the V
CC
ripple is in this allowable
range. However, this allowable range is design reference value and not the guaranteed value.
SBD
V
IN
Figure 1. Output boost circuit example
Figure 2. Gate drive voltage increasing method
Out2
Out2
V
OUT
SBD
V
IN
V
CC
≈
2
×
V
IN
V
D
V
CC
9
V
OUT
SBD
10
10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AN8018SA | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:1.8-volt 2-channel step-up, step-down, or inverting DC-DC converter control IC |
| AN8018SA-E1 | 功能描述:IC REG CTRLR BST INV PWM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤(pán) 包裝:帶卷 (TR) |
| AN8018SA-E1V | 功能描述:IC REG CTRLR BST INV PWM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無(wú) 升壓:無(wú) 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁(yè)面:1316 (CN2011-ZH PDF) |
| AN8019 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| AN-8019 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Reliable USB Modem Design Using the Combination of an Integrated Load Switch and a Buck Converter |
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