鈻?/div>
Fixed 3.3V or 5V Outputs
V
IN
Range:
1.8V to 4.5V (LTC3204-3.3/LTC3204B-3.3)
2.7V to 5.5V (LTC3204-5/LTC3204B-5)
Output Current:
Up to 150mA (LTC3204-5/LTC3204B-5)
Up to 50mA (LTC3204-3.3/LTC3204B-3.3)
Automatic Burst Mode
庐
Operation with I
Q
= 48碌A
(LTC3204-3.3/LTC3204-5)
Constant Frequency Operation at All Loads
(LTC3204B-3.3/LTC3204B-5)
Low Noise Constant Frequency (1.2MHz) Operation*
Built-In Soft-Start Reduces Inrush Current
Shutdown Disconnects Load from Input
Shutdown Current <1碌A
Short-Circuit/Thermal Protection
Available in Low Pro铿乴e 6-Lead DFN Package
2 AA Cell to 3.3V
Li-Ion to 5V
USB On-The-Go Devices
White LED Drivers
Handheld Devices
The LTC
庐
3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5
are low noise, constant frequency (1.2MHz) switched ca-
pacitor voltage doublers. The LTC3204-3.3/LTC3204B-3.3
can produce a regulated output voltage of 3.3V
from a minimum input voltage of 1.8V (2 alkaline cells)
whereas the LTC3204-5/LTC3204B-5 can produce 5V from
a minimum of 2.7V (Li-Ion battery) input.
LTC3204-3.3/LTC3204-5 feature automatic Burst Mode
庐
operation at light loads to maintain low supply current
whereas LTC3204B-3.3/LTC3204B-5 feature constant
frequency operation at any load. Built-in soft-start circuitry
prevents excessive inrush current during start-up. Thermal
shutdown and current-limit circuitry allow the parts to
survive a continuous short-circuit from V
OUT
to GND.
High switching frequency minimizes overall solution
footprint by allowing the use of tiny ceramic capaci-
tors. In shutdown, the load is disconnected from the
input and the quiescent current is reduced to <1碌A. The
LTC3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5 are
available in a low pro铿乴e (0.75mm) 6-lead 2mm 脳 2mm
DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Burst Mode is a registered trademark of Linear Technology Corporation.
*Protected by U.S. Patents including 6411531.
APPLICATIO S
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
2.2碌F
25
2.7V TO 5.5V
2.2碌F
1, 7
6
2
C
鈥?/div>
V
IN
C
+
3
V
OUT
OUTPUT RIPPLE (mVp-p)
5
4
20
15
10
5
0
LTC3204-5/
LTC3204B-5
GND
SHDN
OFF ON
U
TYPICAL APPLICATIO
U
Output Ripple vs Load Current
30
OUTPUT CAPACITANCE = 2.2碌F
V
IN
= 3.6V
5V
2.2碌F
LTC3204-5
3204 TA01a
0
25
3204fa
1
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