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LTC3707EGN-PBF PDF预览

LTC3707EGN-PBF

更新时间： 2024-02-05 12:59:09
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
32页 392K
描述
High Effi ciency, 2-Phase Synchronous Step-Down Switching Regulator

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LTC3707EGN-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, SSOP28,.25
针数：28Reach 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 CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：28 V
最小输入电压：4.5 V标称输入电压：15 V
JESD-30 代码：R-PDSO-G28JESD-609代码：e3
长度：9.9 mm湿度敏感等级：1
功能数量：1端子数量：28
最高工作温度：85 °C最低工作温度：-40 °C
最大输出电流：3 A标称输出电压：3.3 V
封装主体材料：PLASTIC/EPOXY封装代码：SSOP
封装等效代码：SSOP28,.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：PHASE-SHIFT最大切换频率：360 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：3.9 mm
Base Number Matches：1

LTC3707EGN-PBF 数据手册

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LTC3707  
High Efficiency, 2-Phase  
Synchronous Step-Down  
Switching Regulator  
DESCRIPTION  
FEATURES  
The LTC®3707 is a high performance dual step-down  
switching regulator controller that drives N-channel  
synchronouspowerMOSFETstages.Aconstantfrequency  
current mode architecture allows adjustment of the  
frequency up to 300kHz. Power loss and noise due to the  
ESR of the input capacitors are minimized by operating  
the two controller output stages out of phase.  
■
180° Phased Dual Controllers Reduce Required  
Input Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes C  
■
OUT  
■
1.5% Output Voltage Accuracy over Temperature  
■
Dual N-Channel MOSFET Synchronous Drive  
■
Power Good Output Voltage Monitor  
■
DC Programmed Fixed Frequency 150kHz to 300kHz  
■
Wide V Range: 4.5V to 28V Operation  
IN  
OPTI-LOOPcompensationallowsthetransientresponseto  
be optimized over a wide range of output capacitance and  
ESR values. The precision 0.8V reference and power good  
outputindicatorarecompatiblewithfuturemicroprocessor  
generations, and a wide 3.5V to 30V input supply range  
encompasses all battery chemistries.  
■
■
■
■
■
■
■
■
■
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft-Start Current Ramping  
Foldback Output Current Limiting  
Latched Short-Circuit Shutdown with Defeat Option  
Output Overvoltage Protection  
Remote Output Voltage Sense  
A RUN/SS pin for each controller provides both soft-start  
and optional timed, short-circuit shutdown. Current  
foldback limits MOSFET dissipation during short-circuit  
conditions when overcurrent latchoff is disabled. Output  
overvoltage protection circuitry latches on the bottom  
Low Shutdown I : 20μA  
Q
5V and 3.3V Standby Regulators  
Selectable Constant Frequency, Burst Mode®  
Operation or PWM Operation  
■
Small 28-Lead Narrow SSOP Package  
MOSFET until V  
returns to normal. The FCB mode  
OUT  
APPLICATIONS  
pin can select among Burst Mode operation, constant  
frequency mode and continuous inductor current mode  
or regulate a secondary winding.  
■
Notebook and Palmtop Computers, PDAs  
■
Battery Chargers  
■
Portable Instruments  
L, LT, LTC, LTM, Burst Mode, and OPTI-LOOP are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners. Protected by U.S.  
Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6304066, 6580258.  
■
Battery-Operated Digital Devices  
■
DC Power Distribution Systems  
V
IN  
5.2V TO 28V  
C
22μF  
50V  
TYPICAL APPLICATION  
IN  
+
1μF  
4.7μF  
D3  
CERAMIC  
D4  
V
INTV  
IN  
CC  
CERAMIC  
M1  
M2  
M3  
M4  
TG1  
TG2  
L1  
6.3μH  
L2  
6.3μH  
C
, 0.1μF  
C
, 0.1μF  
B2  
B1  
BOOST1  
SW1  
BOOST2  
SW2  
LTC3707  
BG1  
BG2  
D1  
D2  
SGND  
SENSE1  
PGND  
+
+
SENSE2  
R
R
SENSE1  
SENSE2  
0.01Ω  
1000pF  
1000pF  
0.01Ω  
–
–
SENSE1  
SENSE2  
V
V
3.3V  
5A  
OUT1  
5V  
5A  
OUT2  
V
V
OSENSE2  
OSENSE1  
R2  
105k  
1%  
R4  
63.4k  
1%  
I
I
TH1  
TH2  
C
C
C2  
C
C1  
220pF  
C
56μF  
6V  
OUT1  
OUT  
RUN/SS1  
RUN/SS2  
+
+
R1  
20k  
1%  
R3  
20k  
1%  
220pF  
R
C2  
47μF  
6V  
R
C1  
C
C
SS2  
0.1μF  
SS1  
0.1μF  
15k  
15k  
SP  
SP  
M1, M2, M3, M4: FDS6680A  
3707 F01  
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter  
3707fb  
1
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