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LTC3456 Datasheet(PDF) 18 Page - Linear Technology

Part # LTC3456
Description  2-Cell, Multi-Output DC/DC Converter with USB Power Manager
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3456 Datasheet(HTML) 18 Page - Linear Technology

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LTC3456
3456fa
RESET
The LTC3456 contains a RESET circuitry that is active
during both power-up and shutdown. The RESET pin is
held low during initial power-up. When both the VINT and
Core outputs come into regulation, a reset delay timer gets
activated. There is a full 262ms timeout before RESET is
released. During power-off mode RESET is pulled low.
This prevents the microprocessor from entering into any
spurious operating mode.
MODE
The LTC3456 has a user selectable MODE pin. When the
MODE pin is pulled logic high and the LTC3456 is battery
powered, the device will automatically enter into Burst
Mode operation under light load current situations. If the
load current in either of the regulators falls below a
predetermined value, the regulator will enter into Burst
Mode operation independent of the other regulator. When
the MODE pin is connected to ground, continuous PWM
operation is selected. It provides the lowest output voltage
ripple and current ripple, albeit at the cost of lower
efficiency under light load conditions.
OPERATIO
The Burst Mode operation is disabled when the device is
USB or wall powered. The device operates in forced PWM
mode when powered from USB or wall input (irrespective
of the state of the MODE pin). Also, at initial power up, the
device operates in forced PWM mode during the 262ms
initial delay timeout.
Figure 9 shows the Main and Core converters in Burst
Mode operation.
PWRKEY
VCORE
PWRKEY
PULLED LOW
PWRKEY
RELEASED
RESET
262ms
TIMEOUT
POWER-ON SEQUENCE
POWER-OFF SEQUENCE
PWRON
PBSTAT
3456 F08
Figure 8. Power-On/Power-Off Sequence
Figure 9. The LTC3456 in Burst Mode Operation
VMAIN
100mV/DIV
(AC COUPLED)
VCORE
100mV/DIV
(AC COUPLED)
IL1
100mA/DIV
IL2
500mA/DIV
20
µs/DIV
VBATT = 2.4V
IMAIN = 37.5mA
ICORE = 6.2mA
3456 F09



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