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LTC3409A Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC3409A
Description  600mA Low VIN Buck Regulator in 3mm 3mm DFN
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC3409A Datasheet(HTML) 1 Page - Linear Technology

 
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LTC3409A
1
3409af
FEATURES
DESCRIPTION
n Cellular Phones
n Digital Cameras
n MP3 Players
High Efficiency Step-Down Converter
600mA Low VIN Buck
Regulator in 3mm
× 3mm DFN
n 1.6V to 5.5V Input Voltage Range
n 0.62V to 5.5V Output Voltage Range
n Internal Soft-Start
n Selectable 1.7MHz or 2.6MHz Constant Frequency
Operation
n Internal Oscillator Can Be Synchronized to an
External Clock, 1MHz to 3MHz Range
n High Efficiency: Up to 95%
n 65μA Quiescent Current, Burst Mode® Operation
n 600mA Output Current (VIN = 1.8V, VOUT = 1.2V)
n 750mA Peak Inductor Current
n No Schottky Diode Required
n Low Dropout Operation: 100% Duty Cycle
n 0.612V Reference Voltage
n Stable with Ceramic Capacitors
n Shutdown Mode Draws <1μA Supply Current
n Current Mode Operation for Excellent Line and Load
Transient Response
n Overtemperature Protection
n Available in a Low Profile (0.75mm)
8-Lead (3mm
× 3mm) DFN Package
Burst Mode Efficiency, 1.8VOUT
The LTC®3409A is a high efficiency, monolithic synchronous
buck regulator using a constant frequency, current mode
architecture. The LTC3409A improves upon the LTC3409’s
light load regulation in Burst Mode operation. 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,
including ceramics.
Supply current during Burst Mode operation is only
65μA dropping to <1μA in shutdown. The 1.6V to 5.5V
input voltage range makes the LTC3409A 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 bat-
tery life in portable systems. Burst Mode operation can be
user-enabled, increasing efficiency at light loads, further
extending battery life.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Internal
soft-start offers controlled output voltage rise time at start-
up without the need for external components.
APPLICATIONS
TYPICAL APPLICATION
LOAD CURRENT (mA)
0
100
60
70
80
90
40
20
50
30
10
0
1
0.01
0.1
0.001
0.0001
10
3409A TA01b
1000
100
1
2.5VIN, BURST
4.2VIN, BURST
3.6VIN, BURST
POWER LOST
3.6VIN, BURST
VIN
RUN
MODE
SYNC
SW
VFB
GND
LTC3409A
2.2μH*
VOUT
1.8V
267k
4.7μF
VIN
1.8V TO 5.5V
137k
*SUMIDA CDRH2D18/LD
3409A TA01
10pF
22μF
2
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks 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.


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