参数资料
| 型号： | ADP1611ARMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1.2A 8MSOP |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 20V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 700kHz，1.23MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-MSOP |
| 其它名称： | ADP1611ARMZ-R7DKR |
ADP1611
For low ESR output capacitance, such as with a ceramic capaci-
tor, C2 is optional. For optimal transient performance, the
R COMP and C COMP might need to be adjusted by observing the
load transient response of the ADP1611. For most applications,
the compensation resistor should be in the range of 30 k? to
400 k?, and the compensation capacitor should be in the range
of 100 pF to 1.2 nF. Table 7 shows external component values
for several applications.
ERROR AMP
SOFT-START CAPACITOR
The voltage at SS ramps up slowly by charging the soft-start
lists the values for the soft-start period, based on maximum
output current and maximum switching frequency.
The soft-start capacitor limits the rate of voltage rise on the
COMP pin, which in turn limits the peak switch current at
startup. Table 8 shows a typical soft-start period, t SS , at
maximum output current, I OUT_MAX , for several conditions.
REF
COMP
FB 2
g m
1
RC
CC
C2
A 20 nF soft-start capacitor results in negligible input current
overshoot at startup, and so is suitable for most applications.
However, if an unusually large output capacitor is used, a longer
soft-start period is required to prevent input inrush current.
Conversely, if fast startup is a requirement, the soft-start
Figure 26. Compensation Components
capacitor can be reduced or even removed, allowing the
ADP1611 to start quickly, but allowing greater peak switch
Table 7. Recommended External Components for Popular Input/Output Voltage Conditions
V IN (V)
3.3
5
V OUT (V)
5
5
9
9
12
12
9
9
12
12
20
20
f SW (MHz)
0.70
1.23
0.70
1.23
0.70
1.23
0.70
1.23
0.70
1.23
0.70
1.23
L (μH)
4.7
2.7
10
4.7
10
4.7
10
4.7
10
4.7
10
6.8
C OUT (μF)
10
10
10
10
10
10
10
10
10
10
10
10
C IN (μF)
10
10
10
10
10
10
10
10
10
10
10
10
R 1 (k?)
30.9
30.9
63.4
63.4
88.7
88.7
63.4
63.4
88.7
88.7
154
154
R 2 (k?)
10
10
10
10
10
10
10
10
10
10
10
10
R COMP (k?)
50
90.9
71.5
150
130
280
84.5
178
140
300
400
400
C COMP (pF)
520
150
820
180
420
100
390
100
220
100
100
100
I OUT_MAX (mA)
600
600
350
350
250
250
450
450
350
350
250
250
Table 8. Typical Soft Start Period
V IN (V)
3.3
V OUT (V)
5
5
9
9
12
12
C OUT (μF)
10
10
10
10
10
10
C SS (nF)
20
100
20
100
20
100
t SS (ms)
0.3
2
2.5
8.2
3.5
15
V IN (V)
5
V OUT (V)
9
9
12
12
20
20
C OUT (μF)
10
10
10
10
10
10
C SS (nF)
20
100
20
100
20
100
t SS (ms)
0.4
1.5
0.62
2
1.1
4.1
Rev. 0 | Page 13 of 20
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