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LTC3405A-1.5 Datasheet

  • LTC3405A-1.5

  • 1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators i...

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LTC3405A-1.5/LTC3405A-1.8
1.5V, 1.8V, 1.5MHz, 300mA
Synchronous Step-Down
Regulators in ThinSOT
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
High Efficiency: Up to 93%
Very Low Quiescent Current: Only 20
碌
A
During Operation
300mA Output Current at V
IN
= 3V
2.5V to 5.5V Input Voltage Range
1.5MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Stable with Ceramic Capacitors
Shutdown Mode Draws < 1碌A(chǔ) Supply Current
鹵3%
Output Voltage Accuracy
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (1mm) ThinSOT
TM
Package
The LTC
廬
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碌A(chǔ) and drops to <1碌A(chǔ) 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.
APPLICATIO S
s
s
s
s
s
s
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
TYPICAL APPLICATIO
V
IN
2.7V
TO 5.5V
4
C
IN
**
4.7碌F
CER
V
IN
RUN
MODE
V
OUT
2
5
SW
3
100
V
IN
= 2.7V
90
4.7碌H*
EFFICIENCY (%)
LTC3405A-1.8
1
6
V
OUT
1.8V
300mA
C
OUT
**
4.7碌F
CER
80
70
60
50
40
0.1
V
IN
= 5.5V
GND
3405A1518 F01
*MURATA LQH3C4R7M34
**TAIYO YUDEN JMK212BJ475MG
Figure 1a. High Efficiency Step-Down Converter
Figure 1b. Efficiency vs Load Current
sn3405a1518 3405a1518fs
U
V
IN
= 3.6V
V
IN
= 4.2V
1
100
10
OUTPUT CURRENT (mA)
1000
3405A1518 F01b
U
U
1

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