参数资料
| 型号： | LTC1736IG#TR |
| 厂商： | Linear Technology |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC REG SW SYNC STEPDWN HE 24SSOP |
| 标准包装： | 1,800 |
| 应用： | 转换器，Intel Pentium? II，III |
| 输入电压： | 3.5 V ~ 36 V |
| 输出数： | 1 |
| 输出电压： | 0.93 V ~ 2 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 带卷 (TR) |
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LTC1736
APPLICATIO S I FOR ATIO
Manufacturers such as Nichicon, United Chemicon and
Sanyo can be considered for high performance through-
hole capacitors. The OS-CON semiconductor dielectric
capacitor available from Sanyo has the lowest (ESR)(size)
product of any aluminum electrolytic at a somewhat
higher price. An additional ceramic capacitor in parallel
with OS-CON capacitors is recommended to reduce the
inductance effects.
In surface mount applications multiple capacitors may
need to be used in parallel to meet the ESR, RMS current
handling, and load step requirements of the application.
Aluminum electrolytic, dry tantalum and special polymer
capacitors are available in surface mount packages. Spe-
cial polymer surface mount capacitors offer very low ESR
but have much lower capacitive density per unit volume
than other capacitor types. These capacitors offer a very
cost-effective output capacitor solution and are an ideal
choice when combined with a controller having high loop
bandwidth. Tantalum capacitors offer the highest capaci-
tance density and are often used as output capacitors for
switching regulators having controlled soft-start. Several
excellent surge-tested choices are the AVX TPS, AVX
TPSV or the KEMET T510 series of surface mount
tantalums, available in case heights ranging from 2mm to
4mm. Aluminum electrolytic capacitors can be used in
cost-driven applications providing that consideration is
given to ripple current ratings, temperature and long-term
reliability. A typical application will require several to many
aluminum electrolytic capacitors in parallel. A combina-
tion of the above mentioned capacitors will often result in
maximizing performance and minimizing overall cost.
Other capacitor types include Nichicon PL series, NEC
Neocap, Panasonic SP and Sprague 595D series. Consult
manufacturers for other specific recommendations.
Like all components, capacitors are not ideal. Each ca-
pacitor has its own benefits and limitations. Combina-
tions of different capacitor types have proven to be a very
cost effective solution. Remember also to include high
frequency decoupling capacitors. They should be placed
as close as possible to the power pins of the load. Any
inductance present in the circuit board traces negates
their usefulness.
14
INTV CC Regulator
An internal P-channel low dropout regulator produces the
5.2V supply that powers the drivers and internal circuitry
within the LTC1736. The INTV CC pin can supply a maxi-
mum RMS current of 50mA and must be bypassed to
ground with a minimum of 4.7 μ F tantalum, 10 μ F special
polymer or low ESR type electrolytic capacitor. Good
bypassing is required to supply the high transient currents
required by the MOSFET gate drivers.
Higher input voltage applications in which large MOSFETs
are being driven at high frequencies may cause the
maximum junction temperature rating for the LTC1736 to
be exceeded. The system supply current is normally
dominated by the gate charge current. Additional loading
of INTV CC also needs to be taken into account for the
power dissipation calculations. The total INTV CC current
can be supplied by either the 5.2V internal linear regulator
or by the EXTV CC input pin. When the voltage applied to
the EXTV CC pin is less than 4.7V, all of the INTV CC current
is supplied by the internal 5.2V linear regulator. Power
dissipation for the IC in this case is highest: (V IN )(I INTVCC ),
and overall efficiency is lowered. The gate charge is
dependent on operating frequency as discussed in the
Efficiency Considerations section. The junction tempera-
ture can be estimated by using the equations given in
Note 2 of the Electrical Characteristics. For example, the
LTC1736G is limited to less than 17mA from a 30V supply
when not using the EXTV CC pin as follows:
T J = 70 ° C + (17mA)(30V)(110 ° C/W) = 126 ° C
Use of the EXTV CC input pin reduces the junction tempera-
ture to:
T J = 70 ° C + (17mA)(5V)(110 ° C/W) = 79 ° C
To prevent maximum junction temperature from being
exceeded, the input supply current must be checked
operating in continuous mode at maximum V IN .
EXTV CC Connection
The LTC1736 contains an internal P-channel MOSFET
switch connected between the EXTV CC and INTV CC pins.
Whenever the EXTV CC pin is above 4.7V the internal 5.2V
相关PDF资料 |
PDF描述 |
|---|---|
| 1210-393K | COIL 39.0UH FERRITE SMD |
| LTC1736IG#PBF | IC SW REG STEP-DONW SYNC 24-SSOP |
| 1210-333K | COIL 33.0UH FERRITE SMD |
| 1210-273K | COIL 27.0UH FERRITE SMD |
| LTC1736IG | IC REG SW SYNC STEPDWN HE 24SSOP |
相关代理商/技术参数 |
参数描述 |
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| LTC1740CG | 功能描述:IC ADC 14BIT 6MSPS 36SSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| LTC1740CG#PBF | 功能描述:IC ADC 14BIT 6MSPS 36SSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| LTC1740CG#TR | 功能描述:IC ADC SMPL 14BIT 6MSPS 36-SSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| LTC1740CG#TRPBF | 功能描述:IC ADC 14BIT 6MSPS 36SSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| LTC1740IG | 功能描述:IC ADC SMPL 14BIT 6MSPS 36-SSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
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