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LTC1771IS8#TR PDF预览

LTC1771IS8#TR

更新时间： 2024-11-23 13:09:47
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管控制器
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16页 208K
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LTC1771IS8#TR 数据手册

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Final Electrical Specifications  
LTC1771  
Low Quiescent Current  
High Efficiency Step-Down  
DC/DC Controller  
February 2000  
U
FEATURES  
DESCRIPTIO  
The LTC®1771 is a high efficiency current mode step-  
down DC/DC controller that draws as little as 10µA DC  
supply current to regulate the output at no load while  
maintaining high efficiency for loads up to several amps.  
■
Very Low Standby Current: 10µA  
■
Available in Space-Saving 8-Lead MSOP Package  
■
High Output Currents  
■
Wide VIN Range: 2.8V to 20V Operation  
■
VOUT Range: 1.23V to 18V  
TheLTC1771drivesanexternalP-channelpowerMOSFET  
using a current mode, constant off-time architecture. An  
external sense resistor is used to program the operating  
current level. Current mode control provides short-circuit  
protection, excellent transient response and controlled  
start-up behavior. Burst Mode operation enables the  
LTC1771 to maintain high efficiency down to extremely  
low currents. Shutdown mode further reduces the supply  
current to a mere 2µA. For low noise applications, Burst  
Mode operation can be easily disabled with the MODE pin.  
■
High Efficiency: Over 93% Possible  
■
±2% Output Accuracy  
■
Very Low Dropout Operation: 100% Duty Cycle  
■
Current Mode Operation for Excellent Line and  
Load Transient Response  
Defeatable Burst ModeTM Operation  
■
■
Short-Circuit Protected  
Optional Programmable Soft-Start  
■
■
Micropower Shutdown: IQ = 2µA  
U
Wide input supply range of 2.8V to 18V (20V maximum)  
and 100% duty cycle operation for low dropout make the  
LTC1771 ideal for a wide variety of battery-powered appli-  
cations where maximizing battery life is important.  
APPLICATIO S  
■
Cellular Telephones and Wireless Modems  
■
1- to 4-Cell Lithium-Ion-Powered Applications  
■
Portable Instruments  
The LTC1771’s availability in both 8-lead MSOP and SO  
packages provides for a minimum area solution.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
■
Battery-Powered Equipment  
■
Battery Chargers  
■
Scanners  
U
TYPICAL APPLICATIO  
V
IN  
4.5V TO 18V  
LTC1771 Efficiency  
100  
10µF  
25V  
CER  
R
SENSE  
0.05Ω  
V
IN  
= 5V  
90  
80  
70  
60  
50  
40  
V
= 10V  
IN  
M1  
V
SENSE  
PGATE  
IN  
RUN/SS  
Si6447DQ  
L1  
V
IN  
= 15V  
15µH  
V
3.3V  
2A  
OUT  
C
SS  
0.01µF  
LTC1771  
I
TH  
R
C
V
V
MODE  
UPS5817  
+
FB  
IN  
C
OUT  
10k  
GND  
150µF  
R2  
1.64M  
1%  
C
C
6.3V  
22OpF  
R1  
V
= 3.3V  
SENSE  
OUT  
1M  
1%  
R
= 0.05Ω  
5pF  
0.1  
1
10  
100  
1000  
10000  
1771 F01  
LOAD CURRENT (mA)  
1771 F01b  
Figure 1. High Efficiency Step-Down Converter  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
1
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