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參數資料
| 型號： | LT3407 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| 中文描述： | 雙同步，400mA/800mA，2.25MHz降壓直流/直流穩(wěn)壓器 |
| 文件頁數： | 1/16頁 |
| 文件大?。?/td> | 239K |
| 代理商： | LT3407 |
LTC3548
1
3548f
, 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.
APPLICATIOU
■
PDAs/Palmtop PCs
■
Digital Cameras
■
Cellular Phones
■
Portable Media Players
■
PC Cards
■
Wireless and DSL Modems
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
■
High Efficiency: Up to 95%
■
Very Low Quiescent Current: Only 40
μ
A
■
2.25MHz Constant Frequency Operation
■
High Switch Current: 0.7A and 1.2A
■
No Schottky Diodes Required
■
Low R
DS(ON)
Internal Switches: 0.35
■
Current Mode Operation for Excellent Line
and Load Transient Response
■
Short-Circuit Protected
■
Low Dropout Operation: 100% Duty Cycle
■
Ultralow Shutdown Current: I
Q
< 1
μ
A
■
Output Voltages from 5V down to 0.6V
■
Power-On Reset Output
■
Externally Synchronizable Oscillator
■
Small Thermally Enhanced MSOP and 3mm
×
3mm
DFN Packages
Dual Synchronous,
400mA/800mA, 2.25MHz
Step-Down DC/DC Regulator
The LTC
3548 is a dual, constant frequency, 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 0.35
, 0.7A/1.2A
power switches provide high efficiency without the need
for external Schottky diodes.
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.
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
current of only 40
μ
A. In shutdown, the device draws <1
μ
A.
LTC3548 Efficiency Curve
Figure 1. 2.5V/1.8V at 400mA/800mA Step-Down Regulators
RUN2
V
IN
V
IN
= 2.8V
TO 5.5V
V
OUT2
= 2.5V
V
= 1.8V
AT 800mA
RUN1
POR
SW1
V
FB1
GND
V
FB2
SW2
MODE/SYNC
LTC3548
10
μ
F
100k
RESET
33pF
68pF
2.2
μ
H
4.7
μ
H
887k
604k
301k
280k
4.7
μ
F
10
μ
F
3548 TA01
LOAD CURRENT (mA)
1
E
100
95
90
85
80
75
70
65
60
P
1000
100
10
1
0.1
10
100
1000
3548 TA02
V
= 3.3V, V
= 1.8V
Burst Mode OPERATION
CHANNEL 1, NO LOAD ON CHANNEL 2
POWER LOSS
EFFICIENCY
相關PDF資料 |
PDF描述 |
|---|---|
| LT3407-2 | Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548 | 12-Bit To 24-Bit Registered Bus Exchanger With 3-State Outputs 56-SSOP -40 to 85 |
| LTC3548EMSE | Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3701EGN | 2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller |
| LTC3701 | 16-Bit Universal Bus Driver With 3-State Outputs 48-SSOP -40 to 85 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LT3407-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LT340Z | 制造商:SEOUL 制造商全稱:Seoul Semiconductor 功能描述:GREEN OVAL LAMP LED |
| LT341 | 制造商:SEOUL 制造商全稱:Seoul Semiconductor 功能描述:BLUE OVAL LAMP LED |
| LT3412G | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
| LT341BC | 制造商:Datak Corporation 功能描述: |
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