LTC3772
典型应用S
550kHz的微功耗， 1A ， 2节锂离子电池至3.3V
OUT
降压型DC / DC转换器
100pF
15k
I
TH
/ RUN
LTC3772
GND
56.2k
I
PRG
V
FB
SW
UPS120
22pF
174k
3772 TA02a
效率（％）
启动
V
OUT
100mV/DIV
AC耦合
V
OUT
2V/DIV
I
TH
/ RUN
1V/DIV
I
L
1A/DIV
V
IN
= 5.5V
V
OUT
= 3.3V
R
负载
= 3
500s/DIV
U
V
IN
22F
Si2341DS
L1 4.7μH
PGATE
V
IN
5V至8.4V
47F
V
OUT
3.3V
1A
L1 ： SUMIDA CR43-4R7
EF网络效率与负载电流
100
V
IN
= 5.5V
90
80
V
IN
= 8.4V
70
60
50
40
1
100
1000
10
负载电流（mA ）
10000
3772 TA02b
V
OUT
= 3.3V
V
IN
= 7.2V
负载阶跃
I
L
500mA/DIV
I
负载
500mA/DIV
3772 TA02c
V
IN
= 5.5V
20s/DIV
V
OUT
= 3.3V
I
负载
= 40毫安500mA的电流
3772 TA02d
3772f
15
