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Datasheet > LTC1879EGN#PBF
LTC1879EGN#PBF PDF预览

LTC1879EGN#PBF

更新时间： 2024-09-29 21:15:55
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
页数 文件大小 规格书
20页 258K
描述
LTC1879 - 1.2A Synchronous Step-Down Regulator with 15µA Quiescent Current; Package: SSOP; Pins: 16; Temperature Range: -40°C to 85°C

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中文翻译

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LTC1879EGN#PBF 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：SSOP包装说明：SSOP, SSOP16,.25
针数：16Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：3.51模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：10 V最小输入电压：2.65 V
标称输入电压：5 VJESD-30 代码：R-PDSO-G16
JESD-609代码：e3长度：4.9 mm
湿度敏感等级：1功能数量：1
端子数量：16最高工作温度：85 °C
最低工作温度：-40 °C最大输出电流：3 A
封装主体材料：PLASTIC/EPOXY封装代码：SSOP
封装等效代码：SSOP16,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, SHRINK PITCH峰值回流温度（摄氏度）：260
认证状态：Not Qualified座面最大高度：1.75 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：605 kHz
技术：CMOS温度等级：INDUSTRIAL
端子面层：Matte Tin (Sn)端子形式：GULL WING
端子节距：0.635 mm端子位置：DUAL
处于峰值回流温度下的最长时间：30宽度：3.9116 mm
Base Number Matches：1

LTC1879EGN#PBF 数据手册

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LTC1879  
1.2A Synchronous  
Step-Down Regulator with  
15µA Quiescent Current  
U
FEATURES  
DESCRIPTIO  
■
High Efficiency: Up to 95%  
The LTC®1879 is a high efficiency monolithic synchro-  
nous buck regulator using a constant frequency, current  
mode architecture. Operating supply current is only 15µA  
with no load and drops to <1µA in shutdown. The input  
supply voltage range of 2.65V to 10V makes the LTC1879  
ideally suited for both single and dual Li-Ion battery-pow-  
ered applications. 100% duty cycle provides low dropout  
operation, extending battery life in portable systems.  
■
Low Quiescent Current: Only 15µA with No Load  
■
550kHz Constant Frequency Operation  
■
2.65V to 10V Input Voltage Range  
■
VOUT from 0.8V to VIN, IOUT to 1.2A  
■
True PLL Frequency Locking from 350kHz to 750kHz  
■
Power Good Output Voltage Monitor  
■
Low Dropout Operation: 100% Duty Cycle  
Burst Mode® or Pulse Skipping Operation  
■
The switching frequency is internally set to 550kHz, allow-  
ing the use of small surface mount inductors and capaci-  
tors. For noise sensitive applications, the LTC1879 can be  
externally synchronized from 350kHz to 750kHz. Burst  
Mode operation is inhibited during synchronization or  
when the SYNC/MODE pin is pulled low.  
■
Current Mode Operation for Excellent Line and Load  
Transient Response  
■
Shutdown Mode Draws <1µA Supply Current  
■
±2% Output Voltage Accuracy  
■
Overcurrent and Overtemperature Protected  
■
Available in 16-Lead SSOP Package  
The internal synchronous rectifier switch increases effi-  
ciency and eliminates the need for an external Schottky  
diode. Low output voltages are easily supported with a  
0.8Vfeedbackreferencevoltage. TheLTC1879isavailable  
in a 16-lead SSOP package.  
U
APPLICATIO S  
■
Cellular Telephones  
■
Portable Computers  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
Wireless Modems  
Burst Mode is a registered trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
High Efficiency Step-Down Converter  
Efficiency vs Output Load Current  
V
IN  
2.65V TO 10V  
100  
13  
V
IN  
= 3.6V  
C
IN  
10µF  
90  
80  
70  
60  
50  
40  
30  
SV  
IN  
2
15  
14  
4
8, 9  
5, 12  
6, 11  
7, 10  
3
RUN/SS  
PV  
IN  
V
= 7.2V  
IN  
L1  
SYNC/MODE  
LTC1879  
PGOOD  
SWP  
SWN  
6.2µH  
V
*
OUT  
V
IN  
= 10V  
3.1V  
C
OUT  
47µF  
150k  
I
TH  
PGND  
Burst Mode OPERATION  
= 3.1V  
47pF  
220pF  
V
V
OUT  
L = 6.2µH  
FB  
80.6k  
SGND  
1
28.0k  
0.1  
1
10 100  
OUPUT CURRENT (mA)  
1000  
1879 TA01a  
1879 TA01b  
C
C
: TAIYO YUDEN CERAMIC LMK325BJ106MN  
IN  
: TDK CERAMIC C4532X5ROJ476M  
OUT  
L1: TOKO A921CY6R2M  
*V  
CONNECTED TO V (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V < 3.1V  
OUT  
I
N
I
N
1879f  
1
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