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| 型号： | LTC1876EG |
| 厂商： | Linear Technology |
| 文件页数： | 27/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 36-SSOP |
| 标准包装： | 37 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 3 |
| 频率 - 最大： | 360kHz |
| 占空比： | 99.4% |
| 电源电压： | 3.5 V ~ 36 V |
| 降压： | 是 |
| 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 ~ 85°C |
| 封装/外壳： | 36-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
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LTC1876
APPLICATIO S I FOR ATIO
Once the value of L is known, select an inductor that can
handle at least 1A without saturating. In addition, ensure
that the inductor has a low DCR (copper wire resistance)
to minimize I 2 R power losses.
between V OUT3 and AUXV FB as shown in Figure 11. The
frequency of the zero is determined by the following
equation.
Auxiliary Regulator’s Capacitor Selection
f Z =
1
2 π ? R 8 ? C 3
Low ESR (equivalent series resistance) capacitors should
be used at the output to minimize the output ripple voltage.
Multilayer ceramic capacitors are an excellent choice, as
they have extremely low ESR and are available in very
small packages. X5R dielectrics are preferred, followed by
X7R, as these materials retain the capacitance over wide
voltage and temperature ranges. A 4.7 μ F to 10 μ F output
capacitor is sufficient for most applications, but systems
By choosing the appropriate values for the resistor and
capacitor, the zero frequency can be designed to slightly
improve the phase margin of the overall converter. The
typical target value for the zero frequency is between
50kHz to 150kHz.
V OUT3
with very low output current may need only a 1 μ F or 2.2 μ F
LTC1876
R8
C3
output capacitor. Solid tantalum or OS-CON capacitors
can be used, but they will occupy more board area than a
ceramic and will have a higher ESR. Always use a capacitor
with a sufficient voltage rating.
Ceramic capacitors also make a good choice for the input
decoupling capacitor, and should be placed as close as
possible to the AUXV IN pin. A 1 μ F to 4.7 μ F input capacitor
is sufficient for most applications. Table 2 shows a list of
several ceramic capacitor manufacturers. Consult the
manufacturers for detailed information on their entire
selection of ceramic parts.
Table 2. Ceramic Capacitor Manufacturers
AUXV FB
R7
1876 F11
Figure 11. Adding a Phase Lead Zero
Auxiliary Regulator’s Diode Selection
A Schottky diode is recommended for use with the auxil-
iary regulator. The ON Semiconductor MBR0520 is a very
good choice. Where the input to output voltage differential
exceeds 20V, use the MBR0530 (a 30V diode). These
diodes are rated to handle an average forward current of
0.5A. In applications where the average forward current of
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the diode exceeds 0.5A, a Microsemi UPS5817 rated at 1A
is recommended.
Driving AUXSD Above 10V
The decision to use either low ESR (ceramic) capacitors or
higher ESR (tantalum or OS-CON) capacitors can affect
the stability of the overall system. The ESR of any capaci-
tor, along with the capacitance itself, contributes a zero to
the system. For the tantalum and OS-CON capacitors, this
The maximum voltage allowed on the AUXSD pin is 10V.
In some applications if the applied voltage on this pin is
going to exceed 10V, then a series resistor can be con-
nected to this pin. The value for this resistor is given by:
zero is located at a lower frequency due to the higher value
of the ESR, while the zero of a ceramic capacitor is a much
higher frequency and can generally be ignored.
R SERIES =
(V AUXSD – 10)
( 60 ? 10 – 6 )
A phase lead zero can be intentionally introduced by
placing a capacitor (C3) in parallel with the resistor (R8)
By placing this series resistor, it ensures that the voltage
seen by the pin will not exceed 10V.
1876fa
27
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相关代理商/技术参数 |
参数描述 |
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| LTC1876EG#PBF | 功能描述:IC REG CTRLR BST PWM CM 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC1876EG#TR | 功能描述:IC REG CTRLR BST PWM CM 36-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC1876EG#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC1877EMS8 | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1877EMS8#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP 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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