LTC3129-1_15 Datasheet, PDF (25/30 Pages) Linear Technology – 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3A Quiescent Current

Typical Applications
LTC3129-1
5V Converter Operates from Two to Eight AA or AAA Cells Using Bootstrap Diode to Increase Efficiency
at High V_IN and Extend Operation at Low V_IN
V_IN
1.92V TO 15V
AFTER STARTUP
TWO TO EIGHT
AA OR AAA
BATTERIES
V_CC
10µF
22nF _8.2µH 22nF
BST1 SW1
V_IN
SW2 BST2
V_OUT
LTC3129-1
RUN
MPPC
PGOOD
V_IN < 5V, I_OUT = 100mA
V_IN > 5V, I_OUT = 200mA
22µF
V_OUT
5V
BAT54
PWM
VS1
VS2
VS3 _GND
V_CC
PGND
2.2µF
31291 TA06
3.3V Converter Uses MPPC Function to Work with High Resistance Battery Pack
22nF _3.3µH 22nF
V_IN
V_MPPC = 2.9V
10Ω
10µF
1.5M
BST1 SW1
V_IN
SW2 BST2
V_OUT
LTC3129-1
RUN
I_OUT = 100mA
V_OUT
3.3V
10µF
MPPC
PGOOD
1.5V
1.5V
R_C
150k
V_CC
PWM
VS1
V_CC
1.5V
C_C
VS2
33pF 1M
VS3 _{GND PGND}
2.2µF
31291 TA07
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
For more information www.linear.com/LTC3129-1
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