LTC3405A_15 Datasheet, PDF (16/16 Pages) Linear Technology – 1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT

LTC3405A
TYPICAL APPLICATIO
Single Li-Ion to 1.5V/150mA Regulator
Using All Ceramic Capacitors Optimized for Smallest Footprint
V_IN
2.7V
TO 4.2V
C_IN**
2.2µF
CER
4
V_IN
3
SW
LTC3405A
1
RUN
6
5
MODE V_FB
GND
2
2.2µH*
22pF
887k
1M
3405A TA03a
*TAIYO YUDEN LB2012T2R2M
**TAIYO YUDEN CERAMIC LMK212BJ225MG
V_OUT
1.5V
C_OUT**
2.2µF
CER
90
V_OUT = 1.5V
V_IN = 2.7V
80
V_IN = 3.6V
70
V_IN = 4.2V
60
50
40
V_OUT
100mV/DIV
AC COUPLED
I_L
200mA/DIV
I_LOAD
100mA/DIV
30
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3405A TA03b
V_IN = 3.6V
20µs/DIV
V_OUT = 1.5V
I_LOAD = 50mA TO 150mA
3405A TA03c
RELATED PARTS
PART NUMBER
LTC1174/LTC1174-3.3
LTC1174-5
LTC1265
LTC1474/LTC1475
LTC1504A
LT1616
LTC1627
DESCRIPTION
High Efficiency Step-Down and Inverting DC/DC Converters
1.2A, High Efficiency Step-Down DC/DC Converter
Low Quiescent Current Step-Down DC/DC Converters
Monolithic Synchronous Step-Down Switching Regulator
600mA, 1.4MHz Step-Down DC/DC Converter
Monolithic Synchronous Step-Down Switching Regulator
LTC1701
Monolithic Current Mode Step-Down Switching Regulator
LTC1707
Monolithic Synchronous Step-Down Switching Regulator
LTC1767
LTC1779
LTC1877
LTC1878
LTC3404
LTC3405A-1.5/
LTC3405A-1.8
1.5A, 1.25MHz Step-Down Switching Regulator
Monolithic Current Mode Step-Down Switching Regulator
High Efficiency Monolithic Step-Down Regulator
High Efficiency Monolithic Step-Down Regulator
1.4MHz High Efficiency Monolithic Step-Down Regulator
1.5MHz High Efficiency Monolithic Step-Down Regulators
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
COMMENTS
Monolithic Switching Regulators, I_OUT to 450mA,
Burst Mode Operation
Constant Off-Time, Monolithic, Burst Mode Operation
Monolithic, I_OUT to 250mA, I_Q = 10µA, 8-Pin MSOP
Low Cost, Voltage Mode I_OUT to 500mA, V_IN from 4V to 10V
6-Pin ThinSOT, V_IN from 3.6V to 25V
Constant Frequency, I_OUT to 500mA, Secondary Winding
Regulation, V_IN from 2.65V to 8.5V
Constant Off-Time, I_OUT to 500mA, 1MHz Operation,
V_IN from 2.5V to 5.5V
1.19V V_REF Pin, Constant Frequency, I_OUT to 600mA,
V_IN from 2.65V to 8.5V
3V to 25V Input, 8-Lead MSOP Package
550kHz, 6-Lead ThinSOT, V_IN from 2.5V to 9.8V
550kHz, MS8, V_IN Up to 10V, I_Q = 10µA, I_OUT to 600mA at V_IN = 5V
550kHz, MS8, V_IN Up to 6V, I_Q = 10µA, I_OUT to 600mA at V_IN = 3.3V
1.4MHz, MS8, V_IN Up to 6V, I_Q = 10µA, I_OUT to 600mA at V_IN = 3.3V
Fixed Output Versions of the LTC3405A
3405afa
LT/TP 0604 1K REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2002