- 您现在的位置：买卖IC网 > PDF目录1832 > LTC3822EGN-1#PBF (Linear Technology)IC REG CTRLR BUCK PWM CM 16-SSOP PDF资料下载
参数资料
| 型号： | LTC3822EGN-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SSOP |
| 标准包装： | 100 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 850kHz |
| 占空比： | 99% |
| 电源电压： | 2.75 V ~ 4.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1336 (CN2011-ZH PDF) |
LTC3822-1
APPLICATIONS INFORMATION
The selection of C OUT is driven by the effective series
resistance (ESR). Typically, once the ESR requirement
V OUT
is satis?ed, the capacitance is adequate for ?ltering. The
output ripple ( Δ V OUT ) is approximated by:
LTC3822-1
V FB
R B
C FF
≈ I RIPPLE ? ? ESR +
8 ? f ? C
V OUT
?
?
1
OUT
?
? ?
R A
38221 F07
Figure 7. Setting the Output Voltage
where f is the operating frequency, C OUT is the output
capacitance and I RIPPLE is the ripple current in the induc-
tor. The output ripple is highest at maximum input voltage
since I RIPPLE increase with input voltage.
Topside MOSFET Drive Supply (C B , D B )
In the Functional Diagram, external bootstrap capaci-
tor C B is charged from a boost power source (usually
V IN ) through diode D B when the SW node is low. When
a MOSFET is to be turned on, the C B voltage is applied
across the gate source of the desired device. When the
Low Input Supply Voltage
Although the LTC3822-1 can function down to below
2.4V, the maximum allowable output current is reduced
as V IN decreases below 3V. Figure 8 shows the amount
of change as the supply is reduced down to 2.4V. Also
shown is the effect on V REF .
105
V REF
100
topside MOSFET is on, the BOOST pin voltage is above
the input supply. V BOOST = 2V IN . C B must be 100 times
the total input capacitance of the topside MOSFET. The
reverse breakdown of D B must be greater than V IN(MAX) .
Note that in applications where the supply voltage to C B
exceeds V IN , the boost pin will draw approximately 500μA
in shutdown mode.
95
90
85
80
75
MAXIMUM
SENSE VOLTAGE
2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0
Setting Output Voltage
INPUT VOLTAGE (V)
38221 F08
V OUT = 0 . 6 V ? ? 1 + B ?
The LTC3822-1 output voltage is set by an external feed-
back resistor divider carefully placed across the output,
as shown in Figure 7. The regulated output voltage is
determined by:
? R ?
? R A ?
For most applications, a 59k resistor is suggested for R A .
In applications where minimizing the quiescent current is
critical, R A should be made bigger to limit the feedback
Figure 8. Line Regulation of V REF and Maximum Sense Voltage
Minimum On-Time Considerations
Minimum on-time, t ON(MIN) , is the smallest amount of
time that the LTC3822-1 is capable of turning the top
MOSFET on. It is determined by internal timing delays
and the gate charge required to turn on the top MOSFET.
Low duty cycle and high frequency applications may ap-
proach the minimum on-time limit and care should be
taken to ensure that:
f OSC IN
dividercurrent.IfR B thenresultsinveryhighimpedance,
it may be bene?cial to bypass R B with a 10pF to 100pF
capacitor C FF .
t ON ( MIN ) <
V OUT
? V
38221f
17
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3822EMSE#TRPBF | IC REG CTRLR BUCK PWM CM 10-MSOP |
| LTC3823IUH#PBF | IC REG CTRLR BUCK PWM CM 32-QFN |
| LTC3824EMSE#PBF | IC REG CTRLR BUCK PWM CM 10-MSOP |
| LTC3826IUH#TRPBF | IC REG CTRLR BUCK PWM CM 32-QFN |
| LTC3827IG-1#TRPBF | IC REG CTRLR BUCK PWM CM 28-SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3822EMSE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3822EMSE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3823EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3823EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3823EUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。