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ADP1111AN

更新时间： 2024-02-18 00:48:06
品牌 Logo 应用领域
亚德诺 - ADI 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
16页 409K
描述
Micropower, Step-Up/Step-Down SW Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V

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ADP1111AN 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Active零件包装代码：SOIC
包装说明：SOIC-8针数：8
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.14
Is Samacsys：N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：e3长度：4.9 mm
湿度敏感等级：1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
标称输出电压：1.25 V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）：260认证状态：Not Qualified
座面最大高度：1.75 mm子类别：Switching Regulator or Controllers
最大供电电流 (Isup)：0.4 mA表面贴装：YES
切换器配置：BUCK-BOOST最大切换频率：88 kHz
技术：BIPOLAR温度等级：COMMERCIAL
端子面层：Matte Tin (Sn)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：30宽度：3.9 mm
Base Number Matches：1

ADP1111AN 数据手册

 浏览型号ADP1111AN的Datasheet PDF文件第7页浏览型号ADP1111AN的Datasheet PDF文件第8页浏览型号ADP1111AN的Datasheet PDF文件第9页浏览型号ADP1111AN的Datasheet PDF文件第11页浏览型号ADP1111AN的Datasheet PDF文件第12页浏览型号ADP1111AN的Datasheet PDF文件第13页 
ADP1111  
V
IN  
CIRCUIT OPERATION, STEP DOWN (BUCK) MODE)  
The ADP1111’s step down mode is used to produce an output  
voltage that is lower than the input voltage. For example, the  
output of four NiCd cells (+4.8 V) can be converted to a +3 V  
logic supply.  
+
R
3
C
2
2
3
1
V
OUT  
I
V
SW1  
LIM  
IN  
8
4
FB  
D2  
L1  
R2  
ADP1111  
SW2  
A typical configuration for step down operation of the ADP1111  
is shown in Figure 19. In this case, the collector of the internal  
power switch is connected to VIN and the emitter drives the  
inductor. When the switch turns on, SW2 is pulled up towards  
VIN. This forces a voltage across L1 equal to VIN – VCE – VOUT  
and causes current to flow in L1. This current reaches a final  
value of:  
GND  
+
5
C
1
D1  
R1  
D1, D2 = 1N5818 SCHOTTKY DIODES  
Figure 20. Step-Down Model, VOUT > 6.2 V  
If the input voltage to the ADP1111 varies over a wide range, a  
current limiting resistor at Pin 1 may be required. If a particular  
circuit requires high peak inductor current with minimum input  
supply voltage, the peak current may exceed the switch maxi-  
mum rating and/or saturate the inductor when the supply  
voltage is at the maximum value. See the “Limiting the Switch  
Current” section of this data sheet for specific recommendations.  
V
−VCE −VOUT  
IN  
IPEAK  
• 7µs  
L
where 7 µs is the ADP1111 switch’s “on” time.  
V
IN  
+
R
LIM  
100Ω  
C
2
2
3
1
I
V
IN  
SW1  
LIM  
8
4
FB  
INCREASING OUTPUT CURRENT IN THE STEP-DOWN  
REGULATOR  
L1  
ADP1111  
V
OUT  
SW2  
AO SET GND  
+
R2  
R1  
Unlike the boost configuration, the ADP1111’s internal power  
switch is not saturated when operating in step-down mode. A  
conservative value for the voltage across the switch in step-down  
mode is 1.5 V. This results in high power dissipation within the  
ADP1111 when high peak current is required. To increase the  
output current, an external PNP switch can be added (Figure  
21). In this circuit, the ADP1111 provides base drive to Q1  
through R3, while R4 ensures that Q1 turns off rapidly. Because  
the ADP1111’s internal current limiting function will not work  
in this circuit, R5 is provided for this purpose. With the value  
shown, R5 limits current to 2 A. In addition to reducing power  
dissipation on the ADP1111, this circuit also reduces the switch  
voltage. When selecting an inductor value for the circuit of  
Figure 21, the switch voltage can be calculated from the  
formula:  
6
7
5
D1  
1N5818  
C
L
NC NC  
Figure 19. Step-Down Mode Operation  
When the switch turns off, the magnetic field collapses. The  
polarity across the inductor changes, and the switch side of the  
inductor is driven below ground. Schottky diode D1 then turns  
on, and current flows into the load. Notice that the Absolute  
Maximum Rating for the ADP1111’s SW2 pin is 0.5 V below  
ground. To avoid exceeding this limit, D1 must be a Schottky  
diode. If a silicon diode is used for D1, Pin SW2 can go to  
–0.8 V, which will cause potentially damaging power dissipation  
within the ADP1111.  
VSW = VR5 + VQ1(SAT) 0.6 V + 0.4 V  
1 V  
The output voltage of the buck regulator is fed back to the  
ADP1111’s FB pin by resistors R1 and R2. When the voltage at  
pin FB falls below 1.25 V, the internal power switch turns “on”  
again, and the cycle repeats. The output voltage is set by the  
formula:  
INPUT  
R5  
0.3Ω  
R4  
220Ω  
+
Q1  
C
INPUT  
MJE210  
R3  
330Ω  
1
L1  
I
LIM  
3
8
SW1  
OUTPUT  
R2  
VOUT = 1. 25 V • 1 +  
R1  
R2  
R1  
ADP1111  
2
V
IN  
FB  
AO SET GND SW2  
+
6
7
5
4
C
L
D1  
1N5821  
When operating the ADP1111 in step-down mode, the output  
voltage is impressed across the internal power switch’s emitter-  
base junction when the switch is off. To protect the switch, the  
output voltage should be limited to 6.2 V or less. If a higher  
output voltage is required, a Schottky diode should be placed in  
series with SW2 as shown in Figure 20.  
NC NC  
Figure 21. High Current Step-Down Operation  
REV. 0  
–10–  
1...78910111213...16

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