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LTC1875

更新时间： 2024-02-20 16:45:05
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
20页 258K
描述
15mA Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator

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中文翻译

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LTC1875 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,
针数：16Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.16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：6 V最小输入电压：2.65 V
标称输入电压：3.6 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：70 °C
最低工作温度：最大输出电流：3 A
封装主体材料：PLASTIC/EPOXY封装代码：SSOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, SHRINK PITCH
峰值回流温度（摄氏度）：250认证状态：Not Qualified
座面最大高度：1.75 mm表面贴装：YES
切换器配置：BUCK最大切换频率：605 kHz
温度等级：COMMERCIAL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：NOT SPECIFIED
宽度：3.9116 mmBase Number Matches：1

LTC1875 数据手册

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LTC1875  
15µA Quiescent Current  
1.5A Monolithic Synchronous  
Step-Down Regulator  
U
FEATURES  
DESCRIPTIO  
■
High Efficiency: Up to 95%  
The LTC®1875 is a high efficiency 1.5A monolithic syn-  
chronous 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 6V makes the  
LTC1875 ideally suited for single Li-Ion battery-powered  
applications. 100% duty cycle provides low dropout op-  
eration, extending battery life in portable systems.  
■
Low Quiescent Current: Only 15µA with No Load  
■
550kHz Constant Frequency Operation  
■
2.65V to 6V Input Voltage Range  
■
VOUT from 0.8V to VIN, IOUT to 1.5A  
■
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 LTC1875 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 switch increases efficiency and  
eliminates the need for an external Schottky diode. Low  
output voltages are easily supported with a 0.8V feedback  
reference voltage. The LTC1875 is available in a 16-lead  
SSOP package.  
U
APPLICATIO S  
■
Portable Computers  
■
Portable Instruments  
, 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 6V  
100  
C
IN  
V
= 3.6V  
IN  
22µF  
95  
90  
85  
80  
75  
70  
65  
60  
55  
SV  
RUN/SS  
IN  
PV  
IN  
L1  
V
= 4.2V  
IN  
SYNC/MODE SWP  
LTC1875  
6.8µH  
V
*
V
IN  
= 6V  
OUT  
3.3V  
PGOOD  
SWN  
+
C
OUT  
47µF  
150k  
I
PGND  
TH  
88.7k  
47pF  
220pF  
V
FB  
Burst Mode OPERATION  
= 3.3V  
SGND  
V
OUT  
28.0k  
L = 6.8µH  
10 100  
OUPUT CURRENT (mA)  
1875 TA01  
0.1  
1
1000  
C
C
: TAIYO YUDEN CERAMIC JMK325BJ226MM  
IN  
: SANYO POSCAP 6TPA47M  
OUT  
1875 TA01a  
L1: TOKO 646CY-6R8M  
*V  
CONNECTED TO V (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V < 3.3V  
OUT  
I
N
I
N
1875f  
1
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中文翻译

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