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LTC3448EDD#TRPBF

更新时间： 2024-01-08 09:14:23
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
20页 274K
描述
LTC3448 - 1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode; Package: DFN; Pins: 8; Temperature Range: -40°C to 85°C

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中文翻译

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LTC3448EDD#TRPBF 技术参数

是否Rohs认证：符合生命周期：Transferred
零件包装代码：DFN包装说明：HVSSON,
针数：8Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.2Is Samacsys：N
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：5.5 V
最小输入电压：2.5 V标称输入电压：3.6 V
JESD-30 代码：S-PDSO-N8JESD-609代码：e3
长度：3 mm湿度敏感等级：1
功能数量：1端子数量：8
最高工作温度：70 °C最低工作温度：
最大输出电流：0.8 A封装主体材料：PLASTIC/EPOXY
封装代码：HVSSON封装形状：SQUARE
封装形式：SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE, SHRINK PITCH峰值回流温度（摄氏度）：260
认证状态：Not Qualified座面最大高度：0.8 mm
表面贴装：YES切换器配置：BUCK
最大切换频率：2700 kHz温度等级：COMMERCIAL
端子面层：Matte Tin (Sn)端子形式：NO LEAD
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：30宽度：3 mm
Base Number Matches：1

LTC3448EDD#TRPBF 数据手册

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LTC3448  
1.5MHz/2.25MHz, 600mA  
Synchronous Step-Down  
Regulator with LDO Mode  
U
FEATURES  
DESCRIPTIO  
TheLTC®3448isahighefficiency,monolithic,synchronous  
buck regulator using a constant frequency, current mode  
architecture. Supplycurrentduringoperationisonly32µA  
(linearregulatormode)anddropsto<1µAinshutdown.The  
2.5V to 5.5V input voltage range makes the LTC3448 ide-  
ally suited for single Li-Ion battery-powered applications.  
100% duty cycle provides low dropout operation, extend-  
ingbatterylifeinportablesystems.Atmoderateoutputload  
levels, PWMpulseskippingmodeoperationprovidesvery  
low output ripple voltage for noise sensitive applications.  
■
High Efficiency: Up to 96%  
■
Very Low Quiescent Supply Current: 32µA During  
Linear Regulator Operation  
600mA Output Current (Buck Converter)  
Optionally Operates as Linear Regulator Below  
3mA—External or Automatic ON/OFF  
2.5V to 5.5V Input Voltage Range  
1.5MHz or 2.25MHz Constant Frequency Operation  
or External Synchronization  
No Schottky Diode Required  
■
■
■
■
■
■
■
■
■
Low Dropout Operation: 100% Duty Cycle  
0.6V Reference Allows Low Output Voltages  
Shutdown Mode Draws <1µA Supply Current  
Current Mode Operation for Excellent Line and  
Load Transient Response  
The LTC3448 automatically switches into linear regulator  
operation at very low load currents to maintain <5mVP-P  
output voltage ripple. Supply current in this mode is  
typically 32µA. The switch to linear regulator mode occurs  
atathresholdof3mA.Linearregulatoroperationcanbeset  
to on, off or automatic turn on/off.  
■
■
Overtemperature Protected  
Low Profile (3mm × 3mm) 8-Lead DFN and 8-Lead  
MSOP PackagesU  
Switching frequency is selectable at either 1.5MHz or  
2.25MHz, allowing the use of small surface mount induc-  
tors and capacitors.  
APPLICATIO S  
■
Cellular Telephones  
The internal synchronous switch increases efficiency and  
eliminates the need for an external Schottky diode. Low  
output voltages are easily supported with the 0.6V feed-  
back reference voltage. The LTC3448 is available in a low  
profile 3mm × 3mm DFN package or thermally enhanced  
8-lead MSOP.  
■
Personal Information Appliances  
■
Wireless and DSL Modems  
■
Digital Still Cameras  
■
MP3 Players  
■
Portable Instruments  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815,  
6498466, 6611131. Others pending.  
U
Efficiency and Power Loss vs Load Current  
TYPICAL APPLICATIO  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1
V
V
A
= 3.6V  
IN  
OUT  
= 1.5V  
1.5V High Efficiency Regulator with Automatic LDO Mode  
T
= 25°C  
0.1  
2.2µH  
EFFICIENCY  
V
V
OUT  
1.5V  
IN  
2.5V TO 5.5V  
V
SW  
OUT  
LTC3448  
MODE  
IN  
RUN  
POWER LOSS  
C
0.01  
0.001  
0.0001  
V
OUT  
4.7µF  
C
IN  
4.7µF  
474k  
316k  
22pF  
FREQ  
SYNC  
V
FB  
GND  
0.0001  
0.001  
0.01  
0.1  
1
3448 TA01a  
23448 TA01b  
LOAD CURRENT (A)  
3448f  
1
1234567...20

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