ltc3405a Linear Technology Corporation, ltc3405a Datasheet - Page 14

• Manufacturer Part Number: ltc3405a
• Description: 1.5mhz, 300ma Synchronous Step-down Regulator In Thinsot
• Manufacturer: Linear Technology Corporation

LTC3405A
14
TYPICAL APPLICATIO S
100
90
80
70
60
50
40
30
0.1
V
IN
90
80
70
60
50
40
30
OUTPUT CURRENT (mA)
1
= 4.2V
0.1
V
TO 4.2V
IN
= 3.6V
10
2.7V
TO 4.2V
V
OUTPUT CURRENT (mA)
1
IN
V
2.7V
V
IN
IN
V
= 2.7V
Using All Ceramic Capacitors Optimized for Small Footprint
IN
V
U
100
IN
= 3.6V
C
2.2µF
CER
= 4.2V
10
IN
3405A TA01b
Using Ceramic and Tantalum Output Capacitors
**
C
4.7µF
CER
IN
V
**
IN
1000
Single Li-Ion to 1.2V/300mA Regulator
4
1
6
= 2.7V
Single Li-Ion to 1V/200mA Regulator
100
V
RUN
MODE
4
1
6
IN
LTC3405A
3405A TA02b
V
RUN
MODE
GND
IN
LTC3405A
2
GND
1000
SW
V
2
FB
SW
V
FB
3
5
3
5
1.774M
3405A TA01a
4.7µH*
22pF
887k
1M
3.3µH*
22pF
249k
**
*
TAIYO YUDEN LM2016T3R3M
TAIYO YUDEN CERAMIC JMK212BJ475MG
***
**
*
AC COUPLED
AC COUPLED
†
MURATA LQH3C4R7M34
TAIYO YUDEN CERAMIC LMK212BJ225MG
TAIYO YUDEN CERAMIC JMK107BJ105MA
AVX TAJA226M006R
100mV/DIV
200mA/DIV
200mA/DIV
100mV/DIV
100mA/DIV
100mA/DIV
I
I
V
V
C
1µF
CER
LOAD
LOAD
OUT
OUT
OUT1
3405A TA02a
I
I
C
4.7µF
CER
L
L
OUT
***
V
V
I
V
V
I
LOAD =
LOAD =
IN
OUT
IN
OUT
**
= 3.6V
= 3.6V
+
= 1.2V
= 1V
V
1V
OUT
100mA TO 300mA
100mA TO 200mA
C
22µF
TANT
V
1.2V
OUT2
OUT
†
20µs/DIV
20µs/DIV
3405A TA01c
3405A TA02c
3405afa