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LTC3701EGN

更新时间： 2024-11-04 22:09:43
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
20页 251K
描述
2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller

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LTC3701EGN 数据手册

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LTC3701  
2-Phase, Low Input Voltage,  
Dual Step-Down DC/DC Controller  
U
FEATURES  
DESCRIPTIO  
The LTC®3701 is a 2-phase dual constant frequency cur-  
rentmodestep-downDC/DCcontrollerprovidingexcellent  
load and line regulation. Power loss and noise due to ESR  
of the input capacitor are minimized by operating the two  
controller output stages out-of-phase.  
■
Out-of-Phase Controllers Reduce Required  
Input Capacitance  
■
True PLL for Frequency Locking or Frequency  
Adjustment  
■
Operating Frequency Range: 300kHz to 750kHz  
■
Wide VIN Range: 2.5V to 10V  
The LTC3701 provides a 0.8V ±2% voltage reference and  
consumes only 460µA of quiescent current. To further  
maximize the life of a battery source, the external  
P-channel MOSFET is turned on continuously in dropout  
(100% duty cycle).  
■
Constant Frequency Current Mode Architecture  
■
Low Dropout: 100% Duty Cycle  
■
Power Good Output Voltage Monitor  
■
Internal Soft-Start Circuitry  
Selectable Burst Mode®/Pulse Skipping Operation  
at Light Loads  
■
Switching frequency is internally set at 550kHz, allowing  
the use of small inductors and capacitors. For noise sen-  
sitive applications, the LTC3701 can be externally syn-  
chronized using its phase-locked loop. The frequency can  
also be externally set from 300kHz to 750kHz by applying  
avoltagetothePLLLPFpin.BurstModeoperationisinhib-  
ited during synchronization or when the EXTCLK/MODE  
pin is pulled low to reduce noise and RF interference.  
■
■
■
■
Output Overvoltage Protection  
Low Quiescent Current: 460µA  
0.8V ±2% Voltage Reference  
Small 16-Lead Narrow SSOP Package  
U
APPLICATIO S  
■
One or Two Lithium-Ion Powered Applications  
Notebook and Handheld Computers  
Personal Digital Assistants  
Portable Instruments  
Distributed DC Power Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
The LTC3701 contains independent internal soft-start  
circuitry for each controller. Other features include a  
power good output voltage monitor and output overvolt-  
age and short-circuit protection.  
■
■
■
■
The LTC3701 is available in a small footprint 16-lead nar-  
row SSOP package.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
V
IN  
2.5V TO 9.8V  
Efficiency vs Load Current  
100  
169k  
V
= 3.3V  
1
3
2
4
6
5
7
8
16  
15  
14  
13  
12  
11  
10  
9
V
= 4.2V  
IN  
–
+
IN  
SENSE1  
SENSE1  
V
OUT1  
L1  
0.03Ω  
0.03Ω  
90  
80  
2.5V  
220pF  
78.7k  
V
FB1  
V
4.7µH  
IN  
10k  
10k  
2A  
10µF  
M1  
M2  
+
I
/RUN1  
PGATE1  
PGND  
D1  
TH  
SGND  
/RUN2  
47µF  
47µF  
LTC3701  
V
IN  
= 6V  
V
= 8.4V  
IN  
I
PGATE2  
PGOOD  
70  
60  
TH  
D2  
80.6k  
100k  
V
220pF  
FB2  
+
L2  
4.7µH  
V
1.8V  
2A  
OUT2  
PLLLPF EXTCLK/MODE  
–
+
SENSE2  
SENSE2  
50  
40  
V
= 2.5V  
OUT  
3701 F01a  
D1, D2: IR10BQ015 L1, L2: LQN6C-4R7 M1, M2: FDC638P  
1
10  
100  
1000  
10000  
LOAD CURRENT (mA)  
3701 F01b  
Figure 1. High Efficiency 2-Phase 550kHz Dual Step-Down Converter  
3701fa  
1
1234567...20

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