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| LTC3405A_15 Datasheet, PDF (14/16 Pages) Linear Technology – 1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT | |||
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LTC3405A
TYPICAL APPLICATIO S
100
90
80
70
60
50
40
30
0.1
VIN
2.7V
TO 4.2V
Single Li-Ion to 1.2V/300mA Regulator
Using Ceramic and Tantalum Output Capacitors
CIN**
2.2µF
CER
4
VIN
3
SW
LTC3405A
1
RUN
6
5
MODE VFB
GND
2
4.7µH*
22pF
COUT1*** +
1µF
CER
VOUT
1.2V
COUT2â
22µF
TANT
887k *MURATA LQH3C4R7M34
1.774M **TAIYO YUDEN CERAMIC LMK212BJ225MG
***TAIYO YUDEN CERAMIC JMK107BJ105MA
3405A TA01a â AVX TAJA226M006R
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
VOUT
100mV/DIV
AC COUPLED
IL
200mA/DIV
ILOAD
200mA/DIV
1
10
100
OUTPUT CURRENT (mA)
1000
3405A TA01b
VIN = 3.6V
20µs/DIV
VOUT = 1.2V
ILOAD = 100mA TO 300mA
Single Li-Ion to 1V/200mA Regulator
Using All Ceramic Capacitors Optimized for Small Footprint
VIN
2.7V
TO 4.2V
CIN**
4.7µF
CER
4
VIN
3
SW
LTC3405A
1
RUN
6
5
MODE VFB
GND
2
3.3µH*
22pF
VOUT
1V
COUT**
4.7µF
CER
249k
3405A TA02a
1M
*TAIYO YUDEN LM2016T3R3M
**TAIYO YUDEN CERAMIC JMK212BJ475MG
14
90
80
70
60
50
40
30
0.1
VIN = 2.7V
VIN = 4.2V
VIN = 3.6V
1
10
100
OUTPUT CURRENT (mA)
1000
3405A TA02b
VOUT
100mV/DIV
AC COUPLED
IL
100mA/DIV
ILOAD
100mA/DIV
VIN = 3.6V
20µs/DIV
VOUT = 1V
ILOAD = 100mA TO 200mA
3405A TA01c
3405A TA02c
3405afa
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