Linear Technology DC1296A Quick Start Manual page 2

HIGH EFFICIENCY USB POWER MANAGER + DUAL BUCK + BUCK-BOOST
the difference between the allowable USB load and the
battery charging current.
The LTC3556 also has an ideal diode function which al-
lows the maximum energy to be extracted from the bat-
tery. The ideal diode function supports an optional ex-
ternal MOSFET for higher battery currents.
The output voltage of one of the Buck regulators
(VOUT1) and the Buck-Boost can be changed via the I
channel, providing a 2 to 1 range of control.
The output regulators can be enabled, as a group, by the
ENALL pin, or individually over the I
tion, the sequence of regulator startup can be controlled
via the SEQ pin.
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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT
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C channel. In addi-
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C
Figure 1: Y=VOUT1, BLU=VOUT2, PK=VOUT3, GRN = ENALL, SEQ = 0V
Figure 2: Y=VOUT1, BLU=VOUT2, PK=VOUT3, GRN = ENALL, SEQ = VOUT
DC1296A
LTC3556EUFD
2