参数资料
型号: ADP2120ACPZ-1.0-R7
厂商: Analog Devices Inc
文件页数: 19/24页
文件大小: 0K
描述: IC REG BUCK SYNC 1V 10LFCSP
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: 1V
输入电压: 2.3 V ~ 5.5 V
PWM 型: 电流模式
频率 - 开关: 1.2MHz
电流 - 输出: 1.25A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 10-WFDFN 裸露焊盘,CSP
包装: 标准包装
供应商设备封装: 10-LFCSP-WD(3x3)
其它名称: ADP2120ACPZ-1.0-R7DKR
Data Sheet
ADP2119/ADP2120
Table 6. Recommended L and C OUT Values for the ADP2120
V IN (V) V OUT (V) L (μH) C OUT (μF)
V MASTER
ADP2119/
ADP2120
V SLAVE
3.3
1.0
1.5
22 + 10
R TRKT
3.3
3.3
3.3
3.3
1.2
1.5
1.8
2.5
1.5
1.5
1.5
1.5
22 + 10
22 + 10
10 + 10
10 + 10
R TRKB
TRK
FB
R TOP
R BOT
5
5
5
5
5
5
1.0
1.2
1.5
1.8
2.5
3.3
1.5
1.5
2.2
2.2
2.2
2.2
22 + 10
22 + 10
22 + 10
10 + 10
10 + 10
10 + 10
Figure 51. Voltage Tracking
A common application is coincident tracking (see Figure 52).
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 .
Higher or lower inductor and output capacitor values can be
R TOP
V SLAVE R BOT
R TRKT
used in the regulator, but the system stability and load transient
performance need to be checked. The minimum output capacitor
is 22 μF for the ADP2119 and 10 μF for the ADP2120, and the
inductor range is 1 μH to 3.3 μH.
Table 7. Recommended Inductors
Manufacturer Part Number
Sumida CDRH5D18BHPNP, CDR6D23MNNP
TOKO DE4518C, D62LCB
Coilcraft LPS5030, LPS5015
Table 8. Recommended Capacitors
Manufacturer Part Number Description
Murata GRM31CR60J226KE19 22 μF, 6.3 V, X5R, 1206
Murata GRM319R60J106KE19 10 μF, 6.3 V, X5R, 1206
TDK C3216X5R0J226M 22 μF, 6.3 V, X5R, 1206
TDK C3216X5R0J106M 10 μF, 6.3 V, X5R, 1206
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 10 μF or 22 μF ceramic capacitor is
recommended. The rms current rating of the input capacitor
should be larger than calculated by the following equation:
I RMS = I O × D × ( 1 ? D )
VOLTAGE TRACKING
The ADP2119/ADP2120 include a tracking feature that allows
V MASTER
V SLAVE
TIME
Figure 52. Coincident Tracking
Ratiometric tracking is shown in Figure 53. The slave output is
limited to a fraction of the master voltage. In this application,
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 (see the following equation).
1 +
=
V MASTER 1 +
R TRKB
V MASTER
V SLAVE
TIME
Figure 53. Ratiometric Tracking
the output (slave voltage) to be configured to track an external
voltage (master voltage), as shown in Figure 51.
Rev. A | Page 19 of 24
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