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LTC1876

更新时间： 2023-12-20 18:45:20
品牌 Logo 应用领域
亚德诺 - ADI 开关控制器稳压器
页数 文件大小 规格书
36页 363K
描述
高效率、两相、双通道、同步降压型开关控制器和升压型稳压器

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中文翻译

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LTC1876 数据手册

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LTC1876  
High Efficiency, 2-Phase,  
Dual Synchronous Step-Down Switching  
Controller and Step-Up Regulator  
U
FEATURES  
DESCRIPTIO  
Step-Down Controller  
The LTC®1876 isahigh performance triple output switching  
■
regulator. It incorporates a dual step-down switching con-  
trollerthatdrivesallN-channelsynchronouspowerMOSFET  
stages.Astep-upregulatorwithaninternal1A,36Vswitch  
provides the third output.  
Out-of-Phase Controllers Reduce Required Input  
Capacitance and Power Supply Induced Noise  
■
Power Good Output Voltage Indicator  
OPTI-LOOPTM Compensation Minimizes COUT  
■
■
DC Programmed Fixed Frequency 150kHz to 300kHz  
The step-down controllers minimize power loss and noise  
by operating the output stage of each controller out of  
phase. OPTI-LOOP compensation allows the transient  
response to be optimized over a wide range of output  
capacitance and ESR values. A RUN/SS pin for each  
controller provides both soft-start and an optional timed,  
short-circuit shutdown that can be configured to latch off  
one or both controllers. Current foldback provides  
additional short-circuit protection. In an overvoltage  
condition, the bottom MOSFET is latched on until VOUT  
returns to normal. The FCB pin can be used to inhibit Burst  
Mode operation or to enable regulation of a secondary  
output voltage.  
■
Wide VIN Range: 3.5V to 36V Operation  
■
Very Low Dropout Operation: 99% Duty Cycle  
■
Adjustable Soft-Start Current Ramping  
■
Latched Short-Circuit Shutdown with Defeat Option  
■
Remote Output Voltage Sense and OV Protection  
■
5V and 3.3V Standby Regulators  
Selectable Const. Freq. or Burst ModeTM Operation  
■
Step-Up Regulator  
■
High Operating Switching Frequency of 1.2MHz  
■
Low Internal VCESAT Switch: 400mV @ 1A, VIN = 3V  
■
Wide VIN Range: 2.6V to 16V Operation  
■
High Output VoltUage: Up to 34V  
The step-up regulator operates at 1.2MHz, allowing the  
use of tiny low cost capacitors and inductors. In addition,  
its internal 1A switch allows high current outputs to be  
generated. Its current mode control scheme provides  
excellent line and load regulation.  
APPLICATIO S  
■
3.3V Input Step-Down Converter  
Notebook and Palmtop Computers, PDAs  
■
■
Battery-Operated Digital Devices  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
10µH  
V
IN  
5.2V  
+
10µF  
35V  
33µF  
35V  
TO 28V  
+
10V  
V
OUT3  
1µF  
4.7µF  
12V  
CER  
CER  
ALUM  
INTV  
TG2  
AUXV  
V
CC  
IN  
IN  
200mA  
+
M3  
M1  
M2  
10µF  
TG1  
20V  
0.1µF  
0.1µF  
BOOST2  
SW2  
BOOST1  
SW1  
6.3µH  
6.8µH  
LTC1876  
M4  
BG2  
BG1  
AUXSW  
PGND  
AUXV  
FB  
PGOOD  
AUXSD  
86.6k, 1%  
+
+
SENSE1  
SENSE2  
SENSE2  
0.01Ω  
1000pF  
0.01Ω  
1000pF  
–
–
V
5V  
4A  
SENSE1  
OUT1  
V
OUT2  
3.3V  
5A  
V
V
OSENSE1  
OSENSE2  
63.4k  
1%  
105k  
1%  
I
I
TH1  
TH2  
+
56µF  
4V  
SP  
+
47µF  
220pF  
15k  
RUN/SS2 SGND RUN/SS1  
220pF  
15k  
6.3V  
SP  
20k  
1%  
10.2k  
1%  
20k  
1%  
0.1µF  
0.1µF  
M1, M2, M3, M4: FDS6680A  
1876 TA01  
Figure 1. High Efficiency Triple 5V/3.3V/12V Power Supply  
1876fa  
1
1234567...36

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