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LTC3405A-1.5

Description
0.63 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO6
Categorysemiconductor    Analog mixed-signal IC   
File Size223KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC3405A-1.5 Overview

0.63 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO6

LTC3405A-1.5 Parametric

Parameter NameAttribute value
Number of functions1
Number of terminals6
Rated input voltage3.6 V
Maximum limit input voltage5.5 V
Minimum limit input voltage2.5 V
Maximum operating temperature70 Cel
Minimum operating temperature0.0 Cel
Processing package descriptionPlastic, MO-193, TSOT-23, 6 PIN
stateACTIVE
packaging shapeRectangle
Package SizeSMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH
surface mountYes
Terminal formGULL WING
Terminal spacing0.9500 mm
terminal coatingtin lead
Terminal locationpair
Packaging MaterialsPlastic/Epoxy
Temperature levelCOMMERCIAL
control modePEAK current
Control TechnologyPulse width MODULATION
Maximum output current0.6300 A
Analog IC other typesswitching regulator
Switch configurationBUCK
Maximum switching frequency1800 kHz
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
µ
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 < 1µA Supply Current
±3%
Output Voltage Accuracy
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (1mm) ThinSOT
TM
Package
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 20µA and drops to <1µA 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
**
4.7µF
CER
V
IN
RUN
MODE
V
OUT
2
5
SW
3
100
V
IN
= 2.7V
90
4.7µH*
EFFICIENCY (%)
LTC3405A-1.8
1
6
V
OUT
1.8V
300mA
C
OUT
**
4.7µF
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

LTC3405A-1.5 Related Products

LTC3405A-1.5 LTC3405A-1.8 LTC3405AES6-1.5 LTC3405AES6-1.8
Description 0.63 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO6 0.63 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO6 0.63 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO6 0.63 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO6
Number of functions 1 1 1 1
Number of terminals 6 6 6 6
Maximum operating temperature 70 Cel 70 Cel 70 °C 70 °C
surface mount Yes Yes YES YES
Terminal form GULL WING GULL WING GULL WING GULL WING
Terminal location pair pair DUAL DUAL
Temperature level COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL
control mode PEAK current PEAK current CURRENT-MODE CURRENT-MODE
Control Technology Pulse width MODULATION Pulse width MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum output current 0.6300 A 0.6300 A 0.63 A 0.63 A
Switch configuration BUCK BUCK BUCK BUCK
Maximum switching frequency 1800 kHz 1800 kHz 1800 kHz 1800 kHz
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