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LTC3203B PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 LTC3203B
部品説明 500mA Output Current Low Noise Dual Mode Step-Up Charge Pumps
メーカ Linear
ロゴ Linear ロゴ 

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LTC3203B Datasheet, LTC3203B PDF,ピン配置, 機能
FEATURES
Selectable Dual Mode Operation: 1:1.5 or 1:2
High Output Current: Up to 500mA
Low Noise Constant Frequency (1MHz/0.9MHz)
Operation*
VIN Range: 2.7V to 5.5V
Adjustable Output Voltage (LTC3203/LTC3203B)
User Selectable Fixed Output Voltages: 4.5V or 5V
(LTC3203-1 and LTC3203B-1)
Burst Mode® Operation with
IQ ~ 120µA (LTC3203/LTC3203-1)
Constant Freqency Operation at All Loads
(LTC3203B/LTC3203B-1)
Soft-Start Limits Inrush Current at Turn-On
Short-Circuit/Thermal Protection
Shutdown Disconnects Load from Input
Shutdown Current: < 1µA
Available in a 10-pin (3mm × 3mm) DFN Package
U
APPLICATIO S
High Current LED Backlight Supply for
Cellphones/PDAs
Cellphone Camera Light Supply
General Purpose 3.3V or Li-Ion to 5V Supply
USB ON THE GO(OTG) Devices
LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
500mA Output Current
Low Noise Dual Mode
Step-Up Charge Pumps
DESCRIPTIO
The LTC®3203/LTC3203-1/LTC3203B/LTC3203B-1 are low
noise, high efficiency charge pump DC/DC converters
capable of driving loads up to 500mA from a 2.7V to 5.5V
input. Low external parts count (two flying capacitors and
bypass capacitors at VIN and VOUT) make the LTC3203
family ideally suited for small, battery-powered applica-
tions.
Built-in soft-start circuitry prevents excessive inrush
current during start-up. High switching frequency enables
the use of small external capacitors. The LTC3203/
LTC3203-1 feature Burst Mode operation at light load to
achieve high efficiency whereas the LTC3203B/
LTC3203B-1 operate at constant frequency to achieve
lowest noise operation.
The LTC3203-1/LTC3203B-1 have a user selectable fixed
output voltage of 4.5V or 5V to power LEDs or logic
circuits. The FB pin of the LTC3203/LTC3203B can be used
to program the desired output voltage. The parts are short-
circuit and overtemperature protected and are available in
a low profile (3mm × 3mm) DFN package.
, LT, LTC and LTM 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 6411531.
TYPICAL APPLICATIO
VIN
2.2µF
ON/OFF
R1*
100k
2.2µF
SHDN VSEL
LTC3203-1
VIN VOUT
C1+ C2+
C1– C2–
MODE GND
IOUT(MAX)
300mA
300mA
500mA
500mA
VSEL
LOW
HIGH
LOW
HIGH
VOUT
4.5V
5V
4.5V
5V
*R1
316k
357k
357k
402k
OUTPUT PROGRAMMING
2.2µF
VOUT
500mA
10µF
3203 F02
Efficiency vs VIN at 300mA Load Current
100
90
80
VOUT = 5V
70
VOUT = 4.5V
60
50
40
30
20
10
0
2.5 3 3.5 4 4.5 5 5.5
VIN (V)
3203 G05
32031fa
1

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