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LTC1778 PDF预览

LTC1778

更新时间： 2024-11-22 22:55:51
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
24页 304K
描述
Wide Operating Range, No RSENSE Step-Down Controller

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中文翻译

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LTC1778 数据手册

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LTC1778/LTC1778-1  
Wide Operating Range,  
No RSENSETM Step-Down Controller  
U
FEATURES  
DESCRIPTIO  
■
No Sense Resistor Required  
The LTC®1778 is a synchronous step-down switching  
regulator controller optimized for CPU power. The con-  
troller uses a valley current control architecture to deliver  
very low duty cycles with excellent transient response  
without requiring a sense resistor. Operating frequency is  
selected by an external resistor and is compensated for  
variations in VIN.  
■
True Current Mode Control  
■
Optimized for High Step-Down Ratios  
■
t
ON(MIN) ≤ 100ns  
■
■
■
■
■
■
■
■
■
■
■
■
■
■
Extremely Fast Transient Response  
Stable with Ceramic COUT  
Dual N-Channel MOSFET Synchronous Drive  
Power Good Output Voltage Monitor (LTC1778)  
Adjustable On-Time (LTC1778-1)  
Wide VIN Range: 4V to 36V  
±1% 0.8V Voltage Reference  
Adjustable Current Limit  
Adjustable Switching Frequency  
Programmable Soft-Start  
Output Overvoltage Protection  
Optional Short-Circuit Shutdown Timer  
Micropower Shutdown: IQ < 30µA  
Available in a 16-Pin Narrow SSOP Package  
U
Discontinuous mode operation provides high efficiency  
operation at light loads. A forced continuous control pin  
reduces noise and RF interference, and can assist second-  
ary winding regulation by disabling discontinuous opera-  
tion when the main output is lightly loaded.  
Fault protection is provided by internal foldback current  
limiting, an output overvoltage comparator and optional  
short-circuitshutdowntimer.Soft-startcapabilityforsup-  
ply sequencing is accomplished using an external timing  
capacitor.Theregulatorcurrentlimitlevelisuserprogram-  
mable.Widesupplyrangeallowsoperationfrom4Vto36V  
at the input and from 0.8V up to (0.9)VIN at the output.  
APPLICATIO S  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
No RSENSE is a trademark of Linear Technology Corporation.  
Notebook and Palmtop Computers  
Distributed Power Systems  
■
U
TYPICAL APPLICATIO  
R
ON  
Efficiency vs Load Current  
1.4MΩ  
I
ON  
100  
C
SS  
V
= 2.5V  
OUT  
V
IN  
0.1µF  
V
IN  
V
= 5V  
IN  
5V TO 28V  
C
IN  
M1  
10µF  
50V  
×3  
RUN/SS  
TG  
Si4884  
L1  
90  
80  
70  
60  
C
C
1.8µH  
V
2.5V  
10A  
SW  
OUT  
500pF  
C
0.22µF  
V
= 25V  
B
IN  
C
I
TH  
BOOST  
OUT  
+
D
180µF  
4V  
B
R
C
20k  
LTC1778  
SGND INTV  
CMDSH-3  
×2  
CC  
M2  
Si4874  
D1  
B340A  
BG  
+
C
VCC  
4.7µF  
R2  
30.1k  
PGOOD PGND  
V
FB  
0.01  
1
10  
0.1  
R1  
14k  
LOAD CURRENT (A)  
1778 F01b  
1778 F01a  
Figure 1. High Efficiency Step-Down Converter  
1778fa  
1
1234567...24

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