LTC3409
600mA Low V
IN
Buck
Regulator in 3mm
脳
3mm DFN
DESCRIPTIO
The LTC
廬
3409 is a high efficiency, monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. The output voltage is adjusted via an
external resistor divider.
Fixed switching frequencies of 1.7MHz and 2.6MHz are
supported. Alternatively, an internal PLL will synchronize
to an external clock in the frequency range of 1MHz to
3MHz. This range of switching frequencies allows the use
of small surface mount inductors and capacitors, includ-
ing ceramics.
Supply current during Burst Mode operation is only 65碌A(chǔ)
dropping to <1碌A(chǔ) in shutdown. The 1.6V to 5.5V input
voltage range makes the LTC3409 ideally suited for single
cell Li-Ion, Li-Metal and 2-cell alkaline, NiCd or NiMH
battery-powered applications. 100% duty cycle capability
provides low dropout operation, extending battery life in
portable systems. Burst Mode operation can be user-
enabled, increasing efficiency at light loads, further ex-
tending battery life.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Inter-
nal soft-start offers controlled output voltage rise time at
start-up without the need for external components.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815,
6498466, 6611131.
FEATURES
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1.6V to 5.5V Input Voltage Range
Internal Soft-Start
Selectable 1.7MHz or 2.6MHz Constant Frequency
Operation
Internal Oscillator can be Synchronizable to an
External Clock, 1MHz to 3MHz Range
High Efficiency: Up to 95%
Very Low Quiescent Current: Only 65碌A(chǔ) During
Burst Mode
廬
Operation
600mA Output Current (V
IN
= 1.8V, V
OUT
= 1.2V)
750mA Peak Inductor Current
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.613V Reference Voltage
Stable with Ceramic Capacitors
Shutdown Mode Draws <1碌A(chǔ) Supply Current
Current Mode Operation for Excellent Line and Load
Transient Response
Overtemperature Protection
Available in a Low Profile (0.75mm) 8-Lead
(3mm
脳
3mm) DFN Package
APPLICATIO S
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Cellular Phones
Digital Cameras
MP3 Players
TYPICAL APPLICATIO
Burst Mode Efficiency, 1.8V
OUT
100
90
2.5V
IN
, BURST
4.2V
IN
, BURST
3.6V
IN
, BURST
0
POWER LOST
3.6V
IN
, BURST
0.1
POWER LOSS (W)
High Efficiency Step-Down Converter
V
IN
1.8V TO 5.5V
LTC3409
SW
V
IN
RUN
MODE
SYNC
*SUMIDA CDRH2D18/LD
V
FB
GND
133k
255k
2.2碌H*
10pF
10碌F
CER
EFFICIENCY (%)
80
70
4.7碌F
CER
V
OUT
1.8V
60
50
40
30
20
3409 TA01
10
0
0.1
1
10
100
LOAD CURRENT (mA)
1000
3409 TA01b
U
U
U
1.0
3409f
1
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