POWER LOSS (W)
LTC3406-1.2
1.5MHz, 600mA
Synchronous Step-Down
Regulator in ThinSOT
FEATURES
DESCRIPTIO
High Efficiency: Up to 90% The LTC 3406-1.2 is a high efficiency monolithic syn-
Very Low Quiescent Current: Only 20A chronous buck regulator using a constant frequency,
600mA Output Current at V = 3V current mode architecture. Supply current during opera-
IN
2.5V to 5.5V Input Voltage Range tion with only 20A drops <1A in shutdown. The 2.5V to
1.5MHz Constant Frequency Operation
5.5V input voltage range makes the LTC3406-1.2 ideally
No Schottky Diode Required
suited for single Li-Ion battery-powered applications. 100%
Shutdown Mode Draws < 1A Supply Current
duty cycle provides low dropout operation, extending
Current Mode Operation for Excellent Line and
battery life in portable systems. Automatic Burst Mode
Load Transient Response
operation further increases efficiency at light loads.
Overtemperature Protected
Switching frequency is internally set at 1.5MHz, allowing
TM
Low Profile (1mm) ThinSOT Package
the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and
U
APPLICATIO S
eliminates the need for an external Schottky diode. The
LTC3406-1.2 is available in a low profile (1mm) ThinSOT
Cellular Telephones
package.
Personal Information Appliances
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
Wireless and DSL Modems
trademarks are the property of their respective owners. ThinSOT is a trademark of Linear
Technology Corporation. Protected by U.S. Patents including 5481178, 6580258, 6304066,
Digital Still Cameras
6127815, 6498466, 6611131.
MP3 Players
Portable Instruments
TYPICAL APPLICATIO
Efficiency and Power Loss
100 1
High Efficiency Step-Down Converter
EFFICIENCY
90
2.2H
80 0.1
V V
IN V SW OUT
IN
2.7V TO 5.5V C 1.2V
C
OUT
IN
70
10F 600mA
4.7F
LTC3406-1.2
CER
CER 60 0.01
50
RUN V
OUT
340612 TA01a
POWER LOSS
40 0.001
GND
30
20 0.0001
V = 2.7V
IN
V = 3.6V
10 IN
V = 4.2V
IN
0 0.00001
0.1 1000
1 10 100
LOAD CURRENT (mA)
340612 TA01b
340612fa
1
EFFICIENCY (%)
U
ULTC3406-1.2
UUW
ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO
(Note 1)
TOP VIEW
Input Supply Voltage .................................. 0.3V to 6V
RUN, V Voltages................................... 0.3V to V
RUN 1 5 V
OUT
OUT IN
GND 2
SW Voltage (DC) ......................... 0.3V to (V + 0.3V)
IN
SW 3 4 V
IN
P-Channel Switch Source Current (DC) ............. 800mA
N-Channel Switch Sink Current (DC) ................. 800mA
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
Peak SW Sink and Source Current (V = 3V)........ 1.3A
IN
T = 125C, = 250C/ W, = 90C/ W
JMAX JA JC
Operating Temperature Range (Note 2) .. 40C to 85C
Junction Temperature (Notes 3, 5) ...................... 125C
S5 PART MARKING
ORDER PART NUMBER
Storage Temperature Range ................ 65C to 150C
LTC3406ES5-1.2 LTBMQ
Lead Temperature (Soldering, 10 sec)................. 300C
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: