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| 型号： | LT3800EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR INV PWM CM 16-TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 220kHz |
| 占空比： | 95% |
| 电源电压： | 4 V ~ 60 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 是 |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3800
APPLICATIONS INFORMATION
Programming LT3800 V IN UVLO
V IN
Inductor Selection
The primary criterion for inductor value selection in LT3800
applications is ripple current created in that inductor. Basic
R B
R A
3
LT3800
SHDN
SGND
design considerations for ripple current are output voltage
ripple, and the ability of the internal slope compensation
waveform to prevent current mode instability. Once the
value is determined, an inductor must also have a satu-
17
3800 AI02
ration current equal to or exceeding the maximum peak
current in the inductor.
Ripple current ( ? I L ) in an inductor for a given value (L)
R A = R B ?
V OUT
I L = 1–
? OUT
The UVLO voltage, V IN(UVLO) , is set using the following
relation:
V IN(UVLO) – 1.35V
1.35V
If additional hysteresis is desired for the enable function,
an external positive feedback resistor can be used from
the LT3800 regulator output.
The shutdown function can be disabled by connecting the
SHDN pin to V IN through a large value pull-up resistor. This
pin contains a low impedance clamp at 6V, so the SHDN
can be approximated using the relation:
V
V IN f O ? L
The typical range of values for ? I is 20% to 40% of
I OUT(MAX) , where I OUT(MAX) is the maximum converter
output load current. Ripple currents in this range typically
yield a good design compromise between inductor perfor-
mance versus inductor size and cost, and values in this
range are generally a good starting point. A starting point
inductor value can thus be determined using the relation:
I SHDN = IN
V OUT
pin will sink current from the pull-up resistor (R PU ):
V – 6V
R PU
L = V OUT ?
1–
V IN
f O ? 0.3 ?I OUT(MAX)
Because this arrangement will pull the SHDN pin to the
6V clamp voltage, it will violate the 5V absolute maximum
voltage rating of the pin. This is permitted, however, as
long as the absolute maximum input current rating of
1mA is not exceeded. Input SHDN pin currents of <100μA
are recommended; a 1MΩ or greater pull-up resistor is
typically used for this con?guration.
Use of smaller inductors increase output ripple currents,
requiring more capacitance on the converter output. Also,
with converter operation with duty cycles greater than
50%, the slope compensation criterion, described later,
must be met. Designing for smaller ripple currents requires
larger inductor values, which can increase converter cost
and/or footprint.
3800fc
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3800IFE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 4V to 60V 16-Pin TSSOP EP |
| LT3800IFE#PBF | 功能描述:IC REG CTRLR INV PWM CM 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LT3800IFE#PBF | 制造商:Linear Technology 功能描述:IC SYNC STEP-DOWN REGULATOR CTRL 16-TSSO |
| LT3800IFE#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 4V to 60V 16-Pin TSSOP EP T/R |
| LT3800IFE#TRPBF | 功能描述:IC REG CTRLR INV PWM CM 16-TSSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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