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| LTC3549 Datasheet, PDF (16/16 Pages) Linear Technology – 250mA Low VIN Buck Regulator in 2mm × 3mm DFN | |||
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LTC3549
TYPICAL APPLICATIO
VIN
L1, 4.7µH*
2.5V TO
4.2V
CIN
4.7µF
RUN
SW
LTC3549
CL, 22pF
CERAMIC
VIN
MODE VFB
GND
R1, 267k
R2
137k
*TDK VLF3012AT-4R7MR74
3549 TA03a
VOUT
1.8V
COUT
4.7µF
CERAMIC
Efï¬ciency vs Load Current
100
90
VIN = 2.5V
VIN = 3.6V
80
70
VIN = 4.2V
60
50
40
30
20
10
0 VOUT = 1.8V
0.1
1
10
100
LOAD CURRENT (mA)
1000
3549 TA03b
Load Step Response
VOUT
100mV/DIV
AC COUPLED
ILOAD
200mA/DIV
IL
200mA/DIV
20µs/DIV
VIN = 3.6V
VOUT = 1.8V
ILOAD = 100mA to 250mA
3549 TA03c
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1878
600mA (IOUT), 550kHz, Synchronous
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96% Efï¬ciency, VIN: 2.7V to 6V, VOUT(MIN) = 0.8V, IQ = 10µA, ISD < 1µA,
MS8 Package
LTC1879
1.20A (IOUT), 550kHz, Synchronous
Step-Down DC/DC Converter
95% Efï¬ciency, VIN: 2.7V to 10V, VOUT(MIN) = 0.8V, IQ = 15µA, ISD < 1µA,
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LT3020
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100mA, Low Voltage VLDOâ¢
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Step-Down DC/DC Converter
VIN: 0.9V to 10V, VOUT(MIN) = 0.20V, Dropout Voltage = 0.15V, IQ = 120µA,
ISD < 3µA, VOUT = ADJ, DFN/MS8 Packages
VIN: 0.9V to 5.5V, VOUT(MIN) = 0.40V, Dropout Voltage = 0.05V, IQ = 54µA,
ISD < 1µA, VOUT = ADJ, DFN Package
96% Efï¬ciency, VIN: 2.7V to 6V, VOUT(MIN) = 0.8V, IQ = 10µA, ISD < 1µA,
MS8 Package
LTC3405/LTC3405A 300mA (IOUT), 1.5MHz, Synchronous
Step-Down DC/DC Converter
95% Efï¬ciency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.8V, IQ = 20µA, ISD < 1µA,
ThinSOT ⢠Package
LTC3406/LTC3406B 600mA (IOUT), 1.5MHz, Synchronous
Step-Down DC/DC Converter
96% Efï¬ciency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.6V, IQ = 20µA, ISD < 1µA,
ThinSOT Package
LTC3407/LTC3407-2 Dual, 800mA (IOUT), 2.25MHz, Synchronous 95% Efï¬ciency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.6V, IQ = 40µA, ISD < 1µA,
Step-Down DC/DC Converter
10-Lead MSE Package
LTC3409
600mA, 2.6MHz Low VIN, Synchronous
Step-Down DC/DC Converter
95% Efï¬ciency, VIN: 1.6V to 5.5V, VOUT(MIN) = 0.6V, IQ = 65µA, ISD < 1µA,
DFN Package
LTC3410/LTC3410B 300mA, 2.25MHz, Synchronous Step-Down 96% Efï¬ciency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.8V, IQ = 26µA/200µA, ISD < 1µA,
DC/DC Converter
SC70 Package
LTC3411
1.25A (IOUT), 4MHz, Synchronous
Step-Down DC/DC Converter
95% Efï¬ciency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.8V, IQ = 60µA, ISD < 1µA,
10-Lead MS Package
VLDO and ThinSOT are trademarks of Linear Technology Corporation.
3549f
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 â FAX: (408) 434-0507 â www.linear.com
LT 0706 ⢠PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2005
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