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参数资料
| 型号： | ADP2118ACPZ-1.5-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.5V 3A 16LFCSP |
| 特色产品： | ADP2118 High Efficiency Step-Down DC-to-DC Regulator |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.5V |
| 输入电压： | 2.3 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 600kHz，1.2MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘，CSP |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-LFCSP-WQ（3x3） |
| 产品目录页面： | 791 (CN2011-ZH PDF) |
| 其它名称： | ADP2118ACPZ-1.5-R7DKR |
Data Sheet
The ADP2118 has integrated loop compensation for simple
power design. Table 5 and Table 6 show the typical recom-
mended inductors and capacitors for the ADP2118. X5R or X7R
ceramic capacitors are highly recommended.
Table 5. Recommended L and C OUT Value at f S = 1.2 MHz
ADP2118
INPUT CAPACITOR SELECTION
The input capacitor reduces the input voltage ripple caused by
the switch current on PVIN. Place the input capacitor as close
as possible to the PVIN pin. A 22 μF or 47 μF ceramic capacitor
is recommended. The rms current rating of the input capacitor
V IN (V)
3.3
3.3
3.3
3.3
3.3
5
5
5
5
5
5
V OUT (V)
1.0
1.2
1.5
1.8
2.5
1.0
1.2
1.5
1.8
2.5
3.3
L (μH )
1
1
1
1
1
1
1
1
1
1
1
C OUT (μF)
100 + 47
100
100
100
100
100 + 47
100
100
100
100
100
should be larger than the following equation:
I RMS ? I O ? D ? ? 1 ? D ?
VOLTAGE TRACKING
The ADP2118 includes a tracking feature that allows the
ADP2118 output (slave voltage) to be configured to track an
Coincident tracking limits the slave output voltage to be the
same as the master voltage until it reaches regulation. Connect
the TRK pin to a resistor divider from the master voltage. For
coincident tracking, set R TRKT = R TOP and R TRKB = R BOT .
Table 6. Recommended L and C OUT Value at f S = 600 kHz
V IN (V) V OUT (V) L (μH ) C OUT (μF)
Ratiometric tracking is shown in Figure 44. The slave output is
limited to a fraction of the master voltage. In this application,
3.3
3.3
3.3
1.0
1.2
1.5
1.5
1.5
1.5
100 + 47
100
100
the slave and master voltages reach the final value at the same
time. The ratio of the slave output voltage to the master voltage
is a function of the two dividers.
3.3
3.3
5
5
5
1.8
2.5
1.0
1.2
1.5
1.5
1.5
1.5
1.5
2.2
100
100
100 + 47
100
100
V SLAVE
V MASTER
?
1 ?
1 ?
R TOP
R BOT
R TRKT
R TRKB
5
1.8
2.2
100
V MASTER
5
5
2.5
3.3
2.2
2.2
100
100
R TRKT
ADP2118
V SLAVE
Higher or lower inductors and output capacitors can be used in
the regulator, but the system stability and load transient
performance need to be checked.
The minimum output capacitor can be 47 μF. If f S = 1.2 MHz,
the inductor range is 0.8 μH to 3.3 μH. If f S = 600 kHz, the
inductor range is 1.5 μH to 3.3 μH.
R TRKB
TRK
FB
R TOP
R BOT
Table 7. Recommended Inductors
Figure 42. Voltage Tracking
Manufacturer
Part Number
Coilcraft
Sumida
MSS1038, MSS1048, MSS1260
CDRH103R, CDRH104R, CDRH105R
V MASTER
V SLAVE
Table 8. Recommended Capacitors
Manufacturer
Part Number
Description
Murata
Murata
TDK
TDK
GRM32ER60J107ME20
GRM32ER60J476ME20
C3225X5R0J107M
C3225X5R0J476M
100 μF, 6.3 V, X5R, 1210
47 μF, 6.3 V, X5R, 1210
100 μF, 6.3 V, X5R, 1210
47 μF, 6.3 V, X5R, 1210
TIME
Figure 43. Coincident Tracking
V MASTER
V SLAVE
TIME
Figure 44. Ratiometric Tracking
Rev. C | Page 17 of 24
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