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| 型号： | LTC1876EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/36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 |
| 产品目录页面： | 1333 (CN2011-ZH PDF) |
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LTC1876
OPERATIO
(Refer to Functional Diagram)
path, which could include batteries, switches, trace/con-
nector resistances and protection circuitry. Improvements
the input capacitor requirement to that for just one channel
operating at maximum current and 50% duty cycle.
in both conducted and radiated EMI also directly accrue as
a result of the reduced RMS input current and voltage.
Of course, the improvement afforded by 2-phase opera-
tion is a function of the dual switching regulator’s relative
duty cycles which, in turn, are dependent upon the input
voltage V IN (Duty Cycle = V OUT /V IN ). Figure 4 shows how
the RMS input current varies for single-phase and 2-phase
operation for 3.3V and 5V regulators over a wide input
voltage range.
3.0
2.5
2.0
1.5
1.0
0.5
V O1 = 5V/3A
SINGLE PHASE
DUAL CONTROLLER
2-PHASE
DUAL CONTROLLER
It can readily be seen that the advantages of 2-phase
operation are not just limited to a narrow operating range,
0
0
V O2 = 3.3V/3A
10 20 30
INPUT VOLTAGE (V)
40
but in fact extend over a wide region. A good rule of thumb
for most applications is that 2-phase operation will reduce
APPLICATIO S I FOR ATIO
Figure 1 on the first page is a basic LTC1876 application
circuit. For the step-down regulators, the external compo-
nent selection is driven by the load requirement, and
1876 F04
Figure 4. RMS Input Current Comparison
Allowing a margin for variations in the LTC1876 and
external component values yields:
begins with the selection of R SENSE . Once R SENSE is
known, L can be chosen. Next, the power MOSFETs and D1
are selected. Finally, C IN and C OUT are selected . The circuit
shown in Figure 1 can be configured for operation up to an
R SENSE =
50mV
I MAX
input voltage of 28V (limited by the external MOSFETs).
For the step-up regulator, its component selection is much
simpler. A 4.7 μ H or 10 μ H inductor that can handle at least
1A without saturating will work well with most design. A
Shottky diode is recommended and a MBR0520 from ON
2.5
2.0
1.5
Semiconductor is a very good choice.
1.0
R SENSE Selection For Output Current
R SENSE is chosen based on the required output current.
0.5
The LTC1876 current comparator has a maximum thresh-
old of 75mV/R SENSE and an input common mode range of
0
120
170 220 270
320
SGND to 1.1(INTV CC ). The current comparator threshold
sets the peak of the inductor current, yielding a maximum
average output current I MAX equal to the peak value less
half the peak-to-peak ripple current, ? I L .
OPERATING FREQUENCY (kHz)
1876 F05
Figure 5. FREQSET Pin Voltage vs Frequency
1876fa
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LTC1877EMS8#TR | 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#TRPBF | 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: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 |
| LTC1877EMS8PBF | 制造商:Linear Technology 功能描述:1.5A Regulator Step Down LTC1877EMS8 |
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