Datasheet

LTC3129-1
25
31291fa
For more information www.linear.com/LTC3129-1
5V Converter Operates from Tw o to Eight AA or AAA Cells Using Bootstrap Diode to Increase Efficiency
at High V
IN
and Extend Operation at Low V
IN
Typical applicaTions
3.3V Converter Uses MPPC Function to Work with High Resistance Battery Pack
BST1
V
OUT
V
OUT
3.3V
SW1 SW2
LTC3129-1
22nF
BST2
PGOOD
GND
10Ω
V
CC
V
CC
V
IN
V
IN
V
MPPC
= 2.9V
RUN
MPPC
PWM
VS1
VS2
VS3
22nF
3.3µH
1.5M
R
C
150k
1M
10µF
C
C
33pF
10µF
2.2µF
31291 TA07
PGND
I
OUT
= 100mA
1.5V
1.5V
1.5V
NOTE: R
C
AND C
C
HAVE BEEN ADDED FOR IMPROVED MPPC LOOP STABILITY WHEN USING AN INPUT
CAPACITOR VALUE LESS THAN THE RECOMMENDED MINIMUM OF 22µF
V
CC
BST1
V
OUT
V
OUT
5V
SW1 SW2
LTC3129-1
22nF
BST2
PGOOD
GND
V
CC
V
IN
V
IN
1.92V TO 15V
RUN
22nF
8.2µH
BAT54
22µF
2.2µF
31291 TA06
PGND
V
IN
< 5V, I
OUT
= 100mA
V
IN
> 5V, I
OUT
= 200mA
TWO TO EIGHT
AA OR AAA
BATTERIES
MPPC
PWM
VS1
VS2
VS3
10µF
AFTER STARTUP