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LTC3700

更新时间： 2024-10-02 22:55:55
品牌 Logo 应用领域
凌特 - Linear 稳压器控制器
页数 文件大小 规格书
16页 211K
描述
Constant Frequency Step-Down DC/DC Controller with LDO Regulator

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中文翻译

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LTC3700 数据手册

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LTC3700  
Constant Frequency  
Step-Down DC/DC Controller  
with LDO Regulator  
U
FEATURES  
DESCRIPTIO  
The LTC®3700 is a constant frequency current mode step-  
down (buck) DC/DC controller with excellent AC and DC  
load and line regulation. The on-chip 150mA low dropout  
(LDO) linear regulator can be powered from the buck  
controller’s input supply, its own independent input supply  
or the buck regulator’s output. The buck controller incor-  
poratesanundervoltagelockoutfeaturethatshutsdownthe  
controller when the input voltage falls below 2.1V.  
■
Dual Output Regulator in Tiny 10-Pin MSOP  
■
High Efficiency: Up to 94%  
■
Wide VIN Range: 2.65V to 9.8V  
Constant Frequency 550kHz Operation  
■
■
150mA LDO Regulator with Current Limit and  
Thermal Shutdown Protection  
■
High Output Currents Easily Achieved  
Burst Mode® Operation at Light Load  
■
■
Low Dropout: 100% Duty Cycle  
Thebuckregulatorprovidesa±2.5%outputvoltageaccu-  
racy. It consumes only 210µA of quiescent current in nor-  
maloperationwiththeLDOconsuminganadditional50µA.  
In shutdown, a mere 10µA (combined) is consumed.  
■
Current Mode Operation for Excellent Line and Load  
Transient Response  
■
0.8V Reference Allows Low Output Voltages  
■
Low Quiescent Current: 260µA Total  
■
■
Forapplicationswhereefficiencyisaprimeconsideration,  
thebuckcontrollerisconfiguredforBurstModeoperation  
which enhances efficiency at low output current. To fur-  
ther maximize the life of a battery source, the external  
P-channel MOSFET is turned on continuously in dropout  
(100% duty cycle). High constant operating frequency of  
550kHz allows the use of a small external inductor.  
Shutdown Mode Draws Only 10µA Supply Current  
Common Power Good Output for Both Supplies  
U
APPLICATIO S  
■
Notebook Computers  
Portable Instruments  
One or Two Li-Ion Battery-Powered Applications  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
■
The LDO is protected by both current limit and thermal  
shutdown circuits.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
The LTC3700 is available in a tiny 10-pin MSOP.  
U
TYPICAL APPLICATIO  
V
IN1  
5V  
V
IN2  
3.3V  
Buck Efficiency vs Load Current  
C1  
10µF  
10V  
C3  
R1  
0.068Ω  
10µF  
10V  
V
V
IN2  
90  
86  
82  
78  
74  
70  
66  
62  
58  
54  
50  
IN  
V
R
= 1.8V  
SENSE  
OUT  
V
= 3.3V  
V
–
OUT2  
IN  
SENSE  
PGATE  
LDO  
= 0.068Ω  
2.5V AT  
150mA  
169k  
L1  
10µH  
C4  
M1  
V
2.2µF  
V
FB2  
OUT1  
1.8V  
16V  
V
= 5V  
78.7k  
IN  
AT 1A  
100k  
LTC3700  
D1  
V
= 4.2V  
IN  
C2  
+
47µF  
80.6k  
6V  
C1, C3: TAIYO YUDEN EMK325BJ106MNT  
C2: SANYO POSCAP 6TPA47M  
C4: MURATA GRM42-6X7R225K016AL  
D1: MOTOROLA MBRM120T3  
L1: COILTRONICS UP1B-100  
M1: Si3443DV  
V
PGOOD  
/RUN GND  
FB  
10k  
I
TH  
220pF  
3700 F01  
R1: DALE 0.25W  
1
10  
100  
1000  
LOAD CURRENT (mA)  
3700 F01a  
Figure 1. High Efficiency 5V to 1.8V/1A Buck with 3.3V to 2.5V/150mA LDO  
3700f  
1
1234567...16

中文翻译

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