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LTC3407-4

更新时间： 2024-01-10 07:02:41
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
16页 240K
描述
Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator

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LTC3407-4 数据手册

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LTC3407-4  
Dual Synchronous, 800mA,  
2.25MHz Step-Down  
DC/DC Regulator  
U
DESCRIPTIO  
FEATURES  
The LTC®3407-4 is a dual, constant frequency, synchro-  
nous 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 ≤1mm. Each output voltage is adjustable  
from 0.6V to 5V. Internal synchronous 0.35Ω, 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: 1.2A on Each Channel  
■
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 life, the P-channel MOSFETs  
are turned on continuously in dropout (100% duty cycle),  
and both channels draw a total quiescent current of only  
40µA. In shutdown, the device draws <1µA.  
DFN Packages  
U
APPLICATIO S  
■
PDAs/Palmtop PCs  
■
Digital Cameras  
The LTC3407-4 is identical to the LTC3407-2 except for  
the reduced power-on reset delay time.  
, LT, LTC, LTM and Burst Mode 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  
■
Cellular Phones  
■
Portable Media Players  
■
PC Cards  
■
Wireless and DSL Modems  
U
TYPICAL APPLICATIO  
LTC3407-4 Efficiency/Power Loss Curve  
V
*
IN  
2.5V TO 5.5V  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1
R5  
C1  
10µF  
100k  
RUN2  
MODE/SYNC  
LTC3407-4  
V
RUN1  
POR  
IN  
RESET  
0.1  
L2  
L1  
2.2µH  
2.2µH  
V
V
OUT2  
2.5V  
800mA  
OUT1  
SW2  
SW1  
1.8V  
C5, 22pF  
C4, 22pF  
800mA  
0.01  
0.001  
0.0001  
V
FB1  
V
FB2  
R4  
887k  
R2  
604k  
GND  
C3  
10µF  
C2  
10µF  
R3  
280k  
R1  
301k  
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML  
L1, L2: MURATA LQH32CN2R2M33  
0.1  
1
10  
100  
1000  
3407 TA01  
*V CONNECTED TO V FOR V ≤ 2.8V  
OUT IN IN  
LOAD CURRENT (mA)  
34074 TA02  
Figure 1. 2.5V/1.8V at 800mA Step-Down Regulators  
34074f  
1
1234567...16

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