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LTC1773EMS

更新时间： 2024-11-19 05:43:43
品牌 Logo 应用领域
凌特 - Linear 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
20页 285K
描述
Synchronous Step-Down DC/DC Controller

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中文翻译

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LTC1773EMS 技术参数

是否Rohs认证：不符合生命周期：Transferred
零件包装代码：MSOP包装说明：PLASTIC, MSOP-10
针数：10Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.15Is Samacsys：N
模拟集成电路 - 其他类型：SWITCHING CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：8.5 V
最小输入电压：2.65 V标称输入电压：5 V
JESD-30 代码：S-PDSO-G10JESD-609代码：e0
长度：3 mm湿度敏感等级：1
功能数量：1端子数量：10
最高工作温度：70 °C最低工作温度：
封装主体材料：PLASTIC/EPOXY封装代码：TSSOP
封装等效代码：TSSOP10,.19,20封装形状：SQUARE
封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH峰值回流温度（摄氏度）：235
认证状态：Not Qualified座面最大高度：1.1 mm
子类别：Switching Regulator or Controllers表面贴装：YES
切换器配置：BUCK最大切换频率：600 kHz
技术：CMOS温度等级：COMMERCIAL
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：0.5 mm端子位置：DUAL
处于峰值回流温度下的最长时间：20宽度：3 mm
Base Number Matches：1

LTC1773EMS 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

中文翻译

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