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LT3407

更新时间： 2024-11-22 22:46:51
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
16页 239K
描述
Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

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LT3407 数据手册

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LTC3548  
Dual Synchronous,  
400mA/800mA, 2.25MHz  
Step-Down DC/DC Regulator  
U
DESCRIPTIO  
FEATURES  
TheLTC®3548isadual, constantfrequency, synchronous  
step down DC/DC converter. Intended for low power  
applications, it operates from 2.5V to 5.5V input voltage  
range and has a constant 2.25MHz switching frequency,  
allowing the use of tiny, low cost capacitors and inductors  
with a profile ≤1.2mm. Each output voltage is adjustable  
from 0.6V to 5V. Internal synchronous 0.35Ω, 0.7A/1.2A  
power switches provide high efficiency without the need  
for external Schottky diodes.  
■
High Efficiency: Up to 95%  
■
Very Low Quiescent Current: Only 40µA  
■
2.25MHz Constant Frequency Operation  
■
High Switch Current: 0.7A and 1.2A  
■
No Schottky Diodes Required  
■
Low RDS(ON) Internal Switches: 0.35Ω  
■
Current Mode Operation for Excellent Line  
and Load Transient Response  
Short-Circuit Protected  
■
■
Low Dropout Operation: 100% Duty Cycle  
A user selectable mode input is provided to allow the user  
to trade-off noise ripple for low power efficiency. Burst  
Mode® operation provides high efficiency at light loads,  
while Pulse Skip Mode provides low noise ripple at light  
loads.  
■
Ultralow Shutdown Current: IQ < 1µA  
■
Output Voltages from 5V down to 0.6V  
■
Power-On Reset Output  
■
Externally Synchronizable Oscillator  
■
Small Thermally Enhanced MSOP and 3mm × 3mm  
To further maximize battery runtime, the P-channel  
MOSFETs are turned on continuously in dropout (100%  
duty cycle), and both channels draw a total quiescent  
currentofonly40µA.Inshutdown,thedevicedraws<1µA.  
, LTC and LT are registered trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. Burst Mode is a registered  
trademark of Linear Technology Corporation. Protected by U.S. Patents including 5481178,  
6580258, 6304066, 6127815, 6498466, 6611131.  
DFN Packages  
U
APPLICATIO S  
■
PDAs/Palmtop PCs  
■
Digital Cameras  
■
Cellular Phones  
■
Portable Media Players  
■
PC Cards  
■
Wireless and DSL Modems  
U
TYPICAL APPLICATIO  
LTC3548 Efficiency Curve  
V
= 2.8V  
IN  
TO 5.5V  
100  
95  
90  
85  
80  
75  
70  
65  
60  
1000  
100  
10  
10µF  
100k  
RUN2  
V
RUN1  
POR  
IN  
MODE/SYNC  
RESET  
EFFICIENCY  
LTC3548  
4.7µH  
2.2µH  
V
= 2.5V  
V
= 1.8V  
OUT1  
OUT2  
SW2  
SW1  
AT 400mA  
AT 800mA  
POWER LOSS  
68pF  
887k  
33pF  
604k  
1
V
V
FB1  
FB2  
V
= 3.3V, V  
= 1.8V  
OUT  
IN  
GND  
Burst Mode OPERATION  
280k  
301k  
4.7µF  
10µF  
CHANNEL 1, NO LOAD ON CHANNEL 2  
0.1  
1
10  
100  
1000  
3548 TA01  
LOAD CURRENT (mA)  
3548 TA02  
Figure 1. 2.5V/1.8V at 400mA/800mA Step-Down Regulators  
3548f  
1
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