LTC3251_15 Datasheet, PDF (16/16 Pages) Linear Technology – 500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter

LTC3251/
LTC3251-1.2/LTC3251-1.5
TYPICAL APPLICATIO
1.2V Output with mProcessor Control of Operating Modes (Spread Spectrum Disabled)
1-CELL Li-Ion
OR
3-CELL NiMH
µP
1µF
19
MD0 MD1
2
3
1µF ₄
5,11
LTC3251-1.2 ₇
V_IN
V_OUT
C1⁺
C2^{+ 8}
C1^–
C2^{– 6}
10
GND MODE
V_OUT = 1.2V
10µF
X5R
I_OUT UP TO 300mA, V_IN ≥ 2.8V
I_OUT UP TO 500mA, V_IN ≥ 3.0V
1µF 6.3V
3251 TA04
RELATED PARTS
PART NUMBER DESCRIPTION
LTC1514
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LT1776
500mA (I_OUT), 200kHz, High Efficiency
Step-Down DC/DC Converter
LTC1911-1.5/
LTC1911-1.8
250mA, 1.5MHz, High Efficiency
Step-Down Charge Pump
LTC3250-1.5
250mA, 1.5MHz, High Efficiency
Step-Down Charge Pump
LTC3252
250mA, Dual, Low Noise, Inductorless
Step-Down DC/DC Converter
LTC3404
600mA (I_OUT), 1.4MHz, Synchronous
Step-Down DC/DC Converter
LTC3405/LTC3405A 300mA (I_OUT), 1.5MHz, Synchronous
Step-Down DC/DC Converter
LTC3406/LTC3406B 600mA (I_OUT), 1.5MHz, Synchronous
Step-Down DC/DC Converter
LTC3411
1.25A (I_OUT), 4MHz, Synchronous Step-Down
DC/DC Converter
LTC3412
2.5A (I_OUT), 4MHz, Synchronous Step-Down
DC/DC Converter
LTC3440
600mA (I_OUT), 2MHz, Synchronous
Buck-Boost DC/DC Converter
LTC3441
1.2A (I_OUT), 1MHz, Synchronous
Buck-Boost DC/DC Converter
COMMENTS
V_IN: 2.7V to 10V, V_OUT: 3V or 5V, Regulated Output, I_Q: 60µA,
I_SD: 10µA, S8 Package
V_IN: 2.7V to 10V, V_OUT: 3.3V or 5V, Regulated Output, I_Q: 60µA,
I_SD: <1µA, S8 Package
90% Efficiency, V_IN: 7.4V to 40V, V_OUT(MIN): 1.24V,
I_Q: 3.2mA, I_SD: 30µA, N8, S8 Packages
Up to 90% Efficiency, V_IN: 2.7V to 5.5V, V_OUT: 1.5V/1.8V, Regulated Output,
I_Q: 180µA, I_SD: 10µA, MS8 Package
Up to 90% Efficiency, V_IN: 3.1V to 5.5V, V_OUT: 1.5V, Regulated Output,
I_Q: 35µA, I_SD: <1µA, ThinSOT Package
Up to 90% Efficiency, V_IN: 2.7V to 5.5V, V_OUT: 0.9V to 1.6V,
I_Q: 60µA, DFN Package
95% Efficiency, V_IN: 2.7V to 6V, V_OUT(MIN): 0.8V,
I_Q: 10µA, I_SD: <1µA, MS8 Package
95% Efficiency, V_IN: 2.7V to 6V, V_OUT(MIN): 0.8V,
I_Q: 20µA, I_SD: <1µA, ThinSOT Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN): 0.6V,
I_Q: 20µA, I_SD: <1µA, ThinSOT Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN): 0.8V,
I_Q: 60µA, I_SD: <1µA, MS Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN): 0.8V,
I_Q: 60µA, I_SD: <1µA, TSSOP-16E Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT: 2.5V to 5.5V,
I_Q: <25µA, I_SD: 1µA, MS Package
95% Efficiency, V_IN: 2.4V to 5.5V, V_OUT: 2.4V to 5.25V,
I_Q: <25µA, I_SD: 1µA, DFN Package
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
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LT 0306 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2003