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参数资料
| 型号： | LTC3520EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 24QFN |
| 标准包装： | 91 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.2 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 100kHz ~ 2MHz |
| 电流 - 输出： | 600mA，1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
LTC3520
APPLICATIONS INFORMATION
output capacitors. Larger value output capacitors can
be accommodated provided they have suf?cient ESR to
stabilize the loop or by adding a feedforward capacitor in
parallel with the upper feedback resistor.
feedforward capacitor be placed in parallel with R2 in
order to improve the transient response and reduce Burst
Mode ripple.
Table 2. Buck Output Capacitor Range
V OUT C MIN
0.8V 30μF
C MAX
100μF
Buck-Boost Output Voltage Programming
The buck-boost output voltage is set by a resistive divider
according to the following formula:
V OUT = 0 . 782 V ? 1 +
1.2V
1.8V
2.7V
15μF
10μF
7μF
50μF
30μF
22μF
?
?
R2 ?
R 1 ? ?
3.3V
6μF
20μF
The external divider is connected to the output as shown in
Figure 5. In addition to setting the output voltage, the value
Buck Input Capacitor Selection
The PV IN2 pin provides current to the buck converter PMOS
power switch. It is recommended that a low ESR ceramic
capacitor with a value of at least 22μF be used to bypass
this pin. The capacitor should be placed as close to the
pin as possible and have a short return to ground.
Buck Output Voltage Programming
The buck converter output voltage is set by a resistive
divider according to the following formula:
of R2 plays an integral role in compensation of the buck-
boost control loop. For more details, see the Closing the
Buck-Boost Feedback Loop section of this datasheet.
Buck-Boost Inductor Selection
To achieve high ef?ciency, a low ESR inductor should be
utilized for the buck-boost converter. The inductor must
have a saturation rating greater than the worst case average
inductor current plus half the ripple current. The peak-to-
peak inductor current ripple will be larger in buck and boost
mode than in the buck-boost region. The peak-to-peak
V OUT = 0 . 790 V ? 1 +
?
?
R2 ?
R 1 ? ?
inductor current ripple for each mode can be calculated
from the following formulas, where f is the frequency in
MHz and L is the inductance in μH:
Δ I L , P ? P , BUCK =
Δ I L , P ? P , BO O ST
=
The external divider is connected to the output as shown
in Figure 4. A reasonable compromise between noise
immunity and quiescent current is provided by choosing
R2 = 249k. The required value for R1 can then be solved
via the formula above. It is recommended that a 27pF
f L V IN
f L V OUT
1 V OUT ( V IN ? V OUT )
1 V IN ( V OUT ? V IN )
0.8V ≤ V OUT ≤ 5.25V
2.2V ≤ V OUT ≤ 5.25V
LTC3520
R2
27pF
LTC3520
R2
FB2
R1
GND
3520 F04
Figure 4. Setting the Buck Output Voltage
FB1
R1
GND
3520 F05
Figure 5. Setting the Buck-Boost Output Voltage
3520fa
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3520EUF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Synchronous 1A Buck-Boost and 600mA Buck Converters |
| LTC3520IUF#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3520IUF#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3521 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters |
| LTC3521EFE#PBF | 功能描述:IC REG BUCK BST SYNC ADJ 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 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:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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