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LTC1773

更新时间： 2024-11-20 14:57:47
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
20页 293K
描述
同步降压型 DC/DC 控制器

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中文翻译

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LTC1773 数据手册

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LTC1773  
Synchronous Step-Down  
DC/DC Controller  
U
FEATURES  
DESCRIPTIO  
The LTC®1773 is a current mode synchronous buck regu-  
lator controller that drives external complementary power  
MOSFETs using a fixed frequency architecture. The oper-  
ating supply range is from 2.65V to 8.5V, making it  
suitable for 1- or 2-cell lithium-ion battery powered appli-  
cations. BurstMode® operationprovideshighefficiencyat  
low load currents. 100% duty cycle provides low dropout  
operation which extends operating time in battery-oper-  
ated systems.  
■
High Efficiency: Up to 95%  
■
Constant Frequency 550kHz Operation  
■
VIN from 2.65V to 8.5V  
■
VOUT from 0.8V to VIN  
OPTI-LOOP® Compensation Minimizes COUT  
■
■
Synchronizable up to 750kHz  
■
Selectable Burst Mode Operation  
■
Low Quiescent Current: 80µA  
■
Low Dropout Operation: 100% Duty Cycle  
■
Secondary Winding Regulation  
Soft-Start  
The operating frequency is internally set at 550kHz, allow-  
ing the use of small surface mount inductors. For switch-  
ing-noisesensitiveapplications, itcanbesynchronizedup  
to 750kHz. Peak current limit is user programmable with  
an external high side sense resistor. A SYNC/FCB control  
pin guarantees regulation of secondary windings regard-  
less of load on the main output by forcing continuous  
operation. Burst Mode operation is inhibited during syn-  
chronization or when the SYNC/FCB pin is pulled low to  
reducenoiseandRFinterference. Soft-startisprovidedby  
an external capacitor.  
■
■
Current Mode Operation for Excellent Line and  
Load Transient Response  
■
Low Shutdown IQ = 10µA  
■
±1.5% Reference Accuracy  
■
Precision 2.5V Undervoltage Lockout  
■
Available in 10-LUead MSOP  
APPLICATIO S  
■
Cellular Telephones  
■
RF PA Supplies  
Synchronous rectification increases efficiency and elimi-  
nates the need for a Schottky diode, saving components  
and board space. The LTC1773 comes in a 10-lead MSOP  
package.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology Corporation.  
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815.  
■
Portable Instruments  
■
Wireless MODEMS  
■
Distributed Power Systems  
■
Notebook and Palm Top Computers, PDAs  
■
Single and Dual Cell Lithium-Ion Powered Devices  
U
TYPICAL APPLICATIO  
V
IN  
2.65V TO 8.5V  
High Efficiency  
100  
+
V
= 3.3V  
IN  
95  
90  
85  
80  
75  
70  
65  
60  
55  
V
R
C
SYNC/FCB  
IN  
SENSE  
IN  
68µF  
0.025Ω  
V
IN  
= 5V  
RUN/SS SENSE–  
0.1µF  
L1  
3µH  
V
= 8V  
IN  
I
TH  
TG  
V
OUT  
2.5V  
LTC1773  
GND  
47pF  
30k  
SW  
BG  
220pF  
V
FB  
+
Si9801DY  
169k  
C
OUT  
180µF  
L = SUMIDA CDRH6D28-3R0  
80.6k  
1
10  
100  
1000 5000  
1773 F01  
OUTPUT CURRENT (mA)  
1773 F1b  
Figure 1. Step-Down Converter  
1773fb  
1
1234567...20

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