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| 型号： | LTC1876EG |
| 厂商： | Linear Technology |
| 文件页数： | 26/36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
Low V IN Applications
INPUT
SUPPLY
TO SENSE1 +
AND SENSE1 –
In applications where the input supply is low (<5V), the
LTC1876 auxiliary regulator can be used to step-up the
input to provide the gate drive to the external MOSFETs as
R C
C C
V IN
I TH1
I TH2
LTC1876
EXTERNAL
MOSFETs
L1
R S1
V OUT
shown in Figure 9.
Shown in the Typical Application section of the data sheet
is a circuit (3.3V IN Dual-Phase High Efficiency Power
R1
R2
V OSENSE1
V OSENSE2
SGND
L2
TO SENSE2 +
AND SENSE2 –
R S2
+
Supply) with input supply of 3.3V. The boost section of the
LTC1876 is set up to generate 5V and is used to provide the
gate drive to the external MOSFETs. The circuit provides
dual outputs, a 2.5V/15A and 1.8V/15A. Both drawing
power directly from V IN .
INPUT
SUPPLY
L1
AUXV IN
1876 F10
Figure 10. Single Output Configuration
Auxiliary Regulator’s Inductor Value Calculation
Since the current limit for the auxiliary regulator is inter-
nally set at 1A, it makes the selection of components
easier. For the boost regulator, the duty cycle is given by:
AUXSW
LTC1876
BOOST
SECTION
AUXV FB
D1
R8
+
C OUT
V IN
LTC1876
STEP-DOWN
SECTION
EXTERNAL
MOSFETs
Duty Cycle = 1 –
V IN
V OUT
SGND
R7
1876 F09
Since energy is only transferred to the output capacitor(s)
during the off-time, the maximum output current that can
Figure 9. Generating the Gate Drive
for Low Input Supply Applications
Single Output/High Current Applications
In applications that demand current much higher than a
single stage can supply (>20A), the LTC1876 can be
configured as a single output converter. Figure 10 shows
the block diagram of the configuration. Note that the
be supplied by the regulator without losing regulation is:
I OUT = 0.5(2 ? I PK – ? I L )(1 – Duty Cycle)
where I PK = peak inductor current and is internally set at
1A.
? I L = inductor’s ripple current
With the required ripple current determined, the value of
the inductor is:
compensation pins (I TH1 and I TH2 ) of the two channels are
connected together, saving a set of passive components.
In addition, the output voltage sense pins (V OSENSE1 and
L =
(V IN ? Duty Cycle )
( f ? ? I L )
V OSENSE2 ) are shorted together, using only one resistor
divider to set the output voltage.
Although the output current requirement is high, the input
capacitors ripple current requirement is not much differ-
ent compared to the dual outputs circuit. This is attributed
to the fact that the current is shared between two channels
and an out-of-phase architecture is implemented for the
controllers (See Theory and Benefits of 2-Phase
where f = operating frequency (1.2MHz)
In most cases, a larger value of inductance is used. This is
done to account for component variation. It also lowers
the inductor ripple current and results in lower core
losses. In addition, lower ripple also translates into lower
ESR losses in the output capacitors and smaller output
voltage ripple.
Operation).
1876fa
26
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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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