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LTC3410-1.875_15

Description
2.25MHz, 300mA Synchronous Step-Down Regulator in SC70
File Size212KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LTC3410-1.875_15 Overview

2.25MHz, 300mA Synchronous Step-Down Regulator in SC70

LTC3410-1.875
2.25MHz, 300mA
Synchronous Step-Down
Regulator in SC70
FEATURES
DESCRIPTIO
High Efficiency: Up to 93%
Very Low Quiescent Current: Only 26
µ
A
Low Output Voltage Ripple
300mA Output Current at V
IN
= 3V
380mA Minimum Peak Switch Current
2.5V to 5.5V Input Voltage Range
2.25MHz Constant Frequency Operation
No Schottky Diode Required
Stable with Ceramic Capacitors
Shutdown Mode Draws < 1µA Supply Current
±2%
Output Voltage Accuracy
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Available in Low Profile SC70 Package
The LTC
®
3410-1.875 is a high efficiency monolithic syn-
chronous buck regulator using a constant frequency,
current mode architecture. Supply current during opera-
tion is only 26µA, dropping to <1µA in shutdown. The 2.5V
to 5.5V input voltage range makes the LTC3410-1.875
ideally suited for single Li-Ion battery-powered applica-
tions. 100% duty cycle provides low dropout operation,
extending battery life in portable systems.
Switching frequency is internally set at 2.25MHz, allowing
the use of small surface mount inductors and capacitors.
The LTC3410-1.875 is specifically designed to work well
with ceramic output capacitors, achieving very low output
voltage ripple and a small PCB footprint.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. The
LTC3410-1.875 is available in a tiny, low profile SC70
package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 5994885, 6127815, 6304066, 6498466, 6580258, 6611131.
APPLICATIO S
Cellular Telephones
Wireless and DSL Modems
Digital Cameras
MP3 Players
Portable Instruments
TYPICAL APPLICATIO
V
IN
2.7V
TO 5.5V
V
IN
RUN
V
OUT
GND
SW
Efficiency and Power Loss vs
Output Current
100
90
V
OUT
1.875V
4.7µH
C
IN
4.7µF
CER
LTC3410-1.875
C
OUT
4.7µF
CER
EFFICIENCY
V
IN
80
70
EFFICIENCY (%)
60
50
40
30
34101875 TA01
20
10
4.2V
0
0.1
U
2.7V
1
4.2V
3.6V
3.6V
0.01
2.7V
POWER LOSS
V
IN
0.001
0.1
U
U
POWER LOSS (W)
1
10
100
OUTPUT CURRENT (mA)
0.0001
1000
34101875 TA02
34101875f
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