參數(shù)資料
型號(hào)： LTC3405A-1.8
廠商： Linear Technology Corporation
英文描述： 1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT
中文描述： 為1.5V，1.8V的，為1.5MHz，300mA的同步降壓型穩(wěn)壓器在采用ThinSOT
文件頁(yè)數(shù)： 1/16頁(yè)
文件大小： 235K
代理商： LTC3405A-1.8
1
LTC3405A-1.5/LTC3405A-1.8
1.5V, 1.8V, 1.5MHz, 300mA
Synchronous Step-Down
Regulators in ThinSOT
sn3405a1518 3405a1518fs
I
High Efficiency: Up to 93%
I
Very Low Quiescent Current: Only 20
μ
A
During Operation
I
300mA Output Current at V
IN
= 3V
I
2.5V to 5.5V Input Voltage Range
I
1.5MHz Constant Frequency Operation
I
No Schottky Diode Required
I
Low Dropout Operation: 100% Duty Cycle
I
Stable with Ceramic Capacitors
I
Shutdown Mode Draws <1
μ
A Supply Current
I
±
3% Output Voltage Accuracy
I
Current Mode Operation for Excellent Line and
Load Transient Response
I
Overtemperature Protected
I
Low Profile (1mm) ThinSOT
TM
Package
APPLICATIU
The LTC
3405A-1.5/LTC3405A-1.8 are high efficiency
monolithic synchronous buck regulators using a constant
frequency, current mode architecture. Supply current
during operation is only 20
μ
A and drops to <1
μ
A in
shutdown. The 2.5V to 5.5V input voltage range makes the
LTC3405A-1.5/LTC3405A-1.8 ideally suited for single
Li-Ion battery-powered applications. 100% duty cycle
provides low dropout operation, extending battery life in
portable systems.
Switching frequency is internally set at 1.5MHz, allowing
the use of small surface mount inductors and capacitors.
The LTC3405A-1.5/LTC3405A-1.8 are 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
LTC3405A-1.5/LTC3405A-1.8 are available in a low profile
(1mm) ThinSOT package.
For adjustable output voltage, refer to the LTC3405A data
sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
I
Cellular Telephones
I
Personal Information Appliances
I
Wireless and DSL Modems
I
Digital Still Cameras
I
MP3 Players
I
Portable Instruments
Figure 1a. High Efficiency Step-Down Converter
Figure 1b. Efficiency vs Load Current
V
IN
LTC3405A-1.8
C
IN
**
4.7
μ
F
CER
V
IN
2.7V
TO 5.5V
*
**
RUN
MODE
3
4.7
μ
H*
3405A1518 F01
MURATA LQH3C4R7M34
TAIYO YUDEN JMK212BJ475MG
5
4
6
1
2
SW
V
OUT
GND
C
OUT
**
4.7
μ
F
CER
V
1.8V
300mA
DESCRIPTIOU
FEATURES
TYPICAL APPLICATIO
U
OUTPUT CURRENT (mA)
0.1
E
10
1000
100
90
80
70
60
50
40
3405A1518 F01b
1
100
V
IN
= 2.7V
V
IN
= 5.5V
V
IN
= 4.2V
V
IN
= 3.6V
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