LTC3405AES6 Linear Technology Corporation, LTC3405AES6 Datasheet
LTC3405AES6
Manufacturer Part Number
LTC3405AES6
Description
Manufacturer
Linear Technology Corporation
Specifications of LTC3405AES6
Date_code
04
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APPLICATIO S
FEATURES
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TYPICAL APPLICATIO
TO 5.5V
High Efficiency: Up to 96%
Very Low Quiescent Current: Only 20
During Operation
300mA Output Current at V
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
0.8V Reference Allows Low Output Voltages
Shutdown Mode Draws < 1µA Supply Current
±2% Output Voltage Accuracy
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (1mm) ThinSOT
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
2.7V
V
IN
Figure 1a. High Efficiency Step-Down Converter
**
††
*
C
2.2µF
CER
†
V
MURATA LQH3C4R7M34
TAIYO YUDEN LMK212BJ225MG
TAIYO YUDEN JMK212BJ475MG
IN
OUT
†
CONNECTED TO V
4
1
6
U
V
RUN
MODE
IN
LTC3405A
GND
2
SW
V
FB
IN
FOR 2.7V < V
3
5
IN
TM
= 3V
280k
Package
3405A F01a
U
4.7µH**
22pF
887k
IN
< 3.3V
µ
A
C
4.7µF
CER
OUT
††
V
3.3V
OUT
*
DESCRIPTIO
The LTC
nous buck regulator 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 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 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. Low
output voltages are easily supported with the 0.8V feed-
back reference voltage. The LTC3405A is available in a low
profile (1mm) ThinSOT package.
For fixed 1.5V and 1.8V output versions, refer to the
LTC3405A-1.5/LTC3405A-1.8 data sheet.
ThinSOT is a trademark of Linear Technology Corporation.
Protected by U.S. Patents, including 6580258, 5481178.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Synchronous Step-Down
®
3405A is a high efficiency monolithic synchro-
100
95
90
85
80
75
70
65
60
Figure 1b. Efficiency vs Load Current
0.1
Regulator in ThinSOT
V
IN
= 5.5V
U
OUTPUT CURRENT (mA)
1
V
V
IN
IN
1.5MHz, 300mA
= 3.6V
= 4.2V
10
100
3405A F01b
LTC3405A
1000
3405afa
1
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