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ADP1173AR-3.3-REEL

更新时间： 2024-02-11 06:47:48
品牌 Logo 应用领域
亚德诺 - ADI 开关光电二极管
页数 文件大小 规格书
16页 476K
描述
IC 1.5 A SWITCHING REGULATOR, 32 kHz SWITCHING FREQ-MAX, PDSO8, PLASTIC, SO-8, Switching Regulator or Controller

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ADP1173AR-3.3-REEL 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
零件包装代码：SOIC包装说明：SOP, SOP8,.25
针数：8Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.68模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：VOLTAGE-MODE控制技术：PULSE FREQUENCY MODULATION
最大输入电压：30 V最小输入电压：2 V
标称输入电压：3 VJESD-30 代码：R-PDSO-G8
JESD-609代码：e0长度：4.9 mm
功能数量：1端子数量：8
最高工作温度：70 °C最低工作温度：
最大输出电流：1.5 A封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SOP8,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：NOT SPECIFIED认证状态：Not Qualified
座面最大高度：1.75 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：BOOST
最大切换频率：32 kHz技术：BIPOLAR
温度等级：COMMERCIAL端子面层：TIN LEAD
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：3.9 mmBase Number Matches：1

ADP1173AR-3.3-REEL 数据手册

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ADP1173  
For example, assume that +5 V at 300 mA is required from a  
12 V to +24 V input. Deriving the peak current from Equation 6  
yields:  
Using a standard inductor value of 220 µH, with 0.2 Ω dc  
resistance, will produce a peak switch current of:  
–0.85Ω × 23 µs  
4.5V –0.75V  
0.65 Ω+0.2 Ω  
220 µH  
IPEAK  
=
1– e  
= 375 mA  
2×300 mA  
5 + 0.5  
IPEAK  
=
= 545 mA  
0.55  
12 –1.5+ 0.5  
Once the peak current is known, the inductor energy can be  
calculated from Equation 5:  
The peak current can then be inserted into Equation 7 to calcu-  
late the inductor value:  
1
2
(220 µH)×(375 mA)2 =15.5µJ  
12 –1.5–5  
545 mA  
EL  
=
L =  
×23 µs = 232 µH  
The inductor energy of 15.5 µJ is greater than the PL/fOSC  
requirement of 11.5 µJ, so the 220 µH inductor will work in  
this application.  
Since 232 µH is not a standard value, the next lower standard  
value of 220 µH would be specified.  
To avoid exceeding the maximum switch current when the  
input voltage is at +24 V, an RLIM resistor should be specified.  
Using the step-down curve of Figure 5, a value of 180 Ω will  
limit the switch current to 600 mA.  
The input voltage only varies between 4.5 V and 5.5 V in this  
example. Therefore, the peak current will not change enough to  
require an RLIM resistor and the ILIM pin can be connected  
directly to VIN. Care should be taken to ensure that the peak  
current does not exceed 650 mA.  
Inductor Selection—Positive-to-Negative Converter  
The configuration for a positive-to-negative converter using the  
ADP1173 is shown in Figure 17. As with the step-up converter,  
all of the output power for the inverting circuit must be supplied  
by the inductor. The required inductor power is derived from  
the formula:  
CAPACITOR SELECTION  
For optimum performance, the ADP1173’s output capacitor  
must be carefully selected. Choosing an inappropriate capacitor  
can result in low efficiency and/or high output ripple.  
Ordinary aluminum electrolytic capacitors are inexpensive, but  
often have poor Equivalent Series Resistance (ESR) and  
Equivalent Series Inductance (ESL). Low ESR aluminum ca-  
pacitors, specifically designed for switch mode converter appli-  
cations, are also available, and these are a better choice than  
general purpose devices. Even better performance can be  
achieved with tantalum capacitors, although their cost is higher.  
Very low values of ESR can be achieved by using OS-CON*  
capacitors (Sanyo Corporation, San Diego, CA). These devices  
are fairly small, available with tape-and-reel packaging, and have  
very low ESR.  
PL = |VOUT|+VD × I  
) (  
(8)  
(
)
OUT  
The ADP1173 power switch does not saturate in positive-to-  
negative mode. The voltage drop across the switch can be  
modeled as a 0.75 V base-emitter diode in series with a 0.65 Ω  
resistor. When the switch turns on, inductor current will rise at  
a rate determined by:  
_R't  
L
VL  
R'  
IL (t)=  
1– e  
(9)  
where R' = 0.65 Ω + RL(DC)  
where VL = VIN – 0.75 V  
The effects of capacitor selection on output ripple are demon-  
strated in Figures 11, 12, and 13. These figures show the output  
of the same ADP1173 converter, which was evaluated with  
three different output capacitors. In each case, the peak switch  
current is 500 mA and the capacitor value is 100 µF. Figure 11  
shows a Panasonic HF-series* radial aluminum electrolytic.  
When the switch turns off, the output voltage jumps by about  
90 mV and then decays as the inductor discharges into the  
capacitor. The rise in voltage indicates an ESR of about  
0.18 Ω. In Figure 12, the aluminum electrolytic has been  
replaced by a Sprague 593D-series* tantalum device. In this  
case the output jumps about 35 mV, which indicates an ESR of  
0.07 Ω. Figure 13 shows an OS-CON SA series capacitor in the  
same circuit, and ESR is only 0.02 Ω.  
For example, assume that a –5 V output at 50 mA is to be  
generated from a +4.5 V to +5.5 V source. The power in the  
inductor is calculated from Equation 8:  
PL = |−5V|+ 0.5V ×(50 mA)= 275 mW  
(
)
During each switching cycle, the inductor must supply the  
following energy:  
PL 275 mW  
=
=11.5µJ  
fOSC 24 kHz  
*All trademarks are properties of their respective holders.  
REV. 0  
–7–  
1...45678910...16

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