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参数资料
| 型号： | ADP2120ACPZ-1.2-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.2V 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： | 1.2V |
| 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： | 是 |
| 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-1.2-R7DKR |
( V IN ? V OUT ) × D
Δ I L × f S
ADP2119/ADP2120
APPLICATIONS INFORMATION
ADIsimPower DESIGN TOOL
The ADP2119/ADP2120 are supported by ADIsimPower design
tool set. ADIsimPower is a collection of tools that produce
complete power designs optimized for a specific design goal.
The tools enable the user to generate a full schematic, bill of
materials, and calculate performance in minutes. ADIsimPower
can optimize designs for cost, area, efficiency, and parts count
while taking into consideration the operating conditions and
limitations of the IC and all real external components. For
more information about ADIsimPower design tools, refer to
www.analog.com/ADIsimPower . The tool set is available from
this website, and users can also request an unpopulated board
through the tool.
This section describes the selection of the external components
for the ADP2119/ADP2120. The typical application circuit for
C1
0.1μF
Data Sheet
L =
where:
V IN is the input voltage.
V OUT is the output voltage.
Δ I L is the inductor current ripple.
D is the duty cycle. D = V OUT / V IN .
The regulator uses slope compensation in the current loop to
prevent subharmonic oscillations when the duty cycle is larger
than 50%. The internal slope compensation limits the minimum
inductor value.
The negative current limit (?0.6 A) also limits the minimum
inductor value. The inductor current ripple (ΔI L ) calculated
by the selected inductor should not exceed 1.2 A.
The peak inductor current should be kept below the peak current
limit threshold value and can be calculated from
I PEAK = I O +
V IN
5V
C IN
22μF
X5R
6.3V
R1
10?
1
VIN
ADP2119
EN 10
? I L
2
Ensure that the rms current of the selected inductor is greater
than the maximum load current and that its saturation current
V OUT
2.5V
2A
C OUT
22μF
X5R
6.3V
R BOT
15k?
L
1.5μH
R TOP
47.5k?
2
3
4
5
PVIN
SW
PGND
GND
SYNC/MODE 9
PGOOD 8
TRK 7
FB 6
R2
10k?
is greater than the peak current limit of the regulator.
OUTPUT CAPACITOR SELECTION
The output voltage ripple, load step transient, and loop stability
determine the output capacitor selection.
The ESR and the capacitance determine the output ripple.
? V OUT = ? I L × ? ? ESR +
?
?
Figure 50. Typical Application Circuit
?
?
1
8 × C OUT × f S
?
?
V OUT = 0.6 × (1 +
R TOP
OUTPUT VOLTAGE SELECTION
The output voltage of the adjustable version can be set by an
external resistive voltage divider, and the following equation
calculates the output voltage.
)
R BOT
To limit the output voltage accuracy degradation due to FB bias
current (0.1 μA maximum) to less than 0.5% (maximum), ensure
that R BOT is less than 30 k?.
INDUCTOR SELECTION
The load transient response depends on the inductor, the output
capacitor, and the control loop.
The ADP2119/ADP2120 have integrated loop compensation to
provide a simple power solution design. Table 5 and Table 6 show
the typical recommended inductors and capacitors for the ADP2119/
ADP2120. X5R or X7R ceramic capacitors are highly recommended.
Table 5. Recommended L and C OUT Values for the ADP2119
V IN (V) V OUT (V) L (μH) C OUT (μF)
3.3 1.0 1 22 + 22
3.3 1.2 1 22 + 22
3.3 1.5 1 22 + 10
The inductor value is determined by the operating frequency,
input voltage, output voltage, and ripple current. A small inductor
value leads to a larger inductor current ripple and provides a
faster transient response; however, it degrades efficiency. A
large inductor value leads to a smaller current ripple and good
efficiency but slows the transient response. As a guideline, the
inductor current ripple, ΔI L , is typically set to 1/3 of the maximum
load current trade-off between the transient response and efficiency.
3.3
3.3
5
5
5
5
5
5
1.8
2.5
1.0
1.2
1.5
1.8
2.5
3.3
1
1
1
1.5
1.5
1.5
1.5
1.5
22
22
22 + 22
22 + 22
22 +10
22 +10
22
22
The inductor value can be calculated using the following equation:
Rev. A | Page 18 of 24
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