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ML1565QFNG Scheda tecnica(PDF) 7 Page - Minilogic Device Corporation Limited

Il numero della parte ML1565QFNG
Spiegazioni elettronici  Step-Up-Down DC-DC Converts
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Produttore elettronici  MINILOGIC [Minilogic Device Corporation Limited]
Homepage  http://www.minilogic.com.hk
Logo MINILOGIC - Minilogic Device Corporation Limited

ML1565QFNG Scheda tecnica(HTML) 7 Page - Minilogic Device Corporation Limited

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P7/21
Rev. C, Sep 2005
ML1565
Pin Description
Pin1
COMP1
Pin2
FB1
Pin3
PGNDA
Pin4
LXSD
Pin5
INSD
Pin6
ONSD
Pin7
COMPSD
Pin8
FBSD
Pin9
ON1
Pin10
ON2
Pin11
ON3
Pin12
ONSU
Pin13
REF
Pin14
FBSU
Pin15
COMPSU
Auxiliary Controller 1 Compensation Node. Connect a series RC from COMP1 To GND to compensate
the control loop. COMP1 is actively driven to GND in shutdown and thermal limit.
Auxiliary Controller 1 Feedback Input. For 5V output, short FBSEL1 to GND and connect FB1 to the
output voltage. For other output voltages, connect FBSEL1 to OUTSU and connect a resistive voltage
divider from the step-up converter output to FB1 to GND. The FB1 feedback threshold is then 1.25V.
This pin is high impedance in shutdown.
Power Ground. Connect PGNDA and PGNDB together and to GND with short trace as close to the IC
as possible.
Step-Down Converter Power-Switching Node. Connect LXSD to the step-down converter inductor.
LXSD is the drain of the P-channel switch and N-channel synchronous rectifier. LXSD is high
impedance in shutdown.
Step-Down Converter Input. INSD can connect to OUTSU, effectively making OUTSD a buck-boost
output from the battery. Bypass to GND with a 1µF ceramic capacitor if connected to OUTSU. INSD
may also be connected to the battery, but should not exceed OUTSU by more than a Schottky diode
forward voltage. Bypass INSD with a 10µF ceramic capacitor when connecting to the battery input. A
10kΩ internal resistance connects OUTSU and INSD.
Step-Down Converter On/Off Control Input. Drive ONSD high to turn on the step-down converter. This
pin has an internal 330kΩ pulldown resistor. ONSD does not start until OUTSU is in regulation.
Step-Down Converter Compensation Node. Connect a series RC from COMPSD to GND to
compensate the control loop. COMPSD is pulled to GND in normal shutdown and during thermal
shutdown (see the Step-Down Compensation section).
Step-Down Converter Feedback Input. For a 1.5V output, short FBSELSD to GND and connect FBSD
to OUTSD. For other voltages, short FBSELSD to OUTSU and connect a resistive voltage-divider
from OUTSD to FBSD to GND. The FBSD feedback threshold is 1.25V. This pin is high impedance in
shutdown.
Auxiliary Controller 1 On/Off control Input Drive ON1 high to turn on. This pin has an internal 330kΩ
pulldown resistor. ON1 cannot start until OUTSU is in regulation.
Auxiliary Controller 2 On/Off control Input Drive ON2 high to turn on. This pin has an internal 330kΩ
pulldown resistor. ON2 cannot start until OUTSU is in regulation.
Auxiliary Controller 3 On/Off control Input Drive ON3 high to turn on. This pin has an internal 330kΩ
pulldown resistor. ON3 cannot start until OUTSU is in regulation.
Step-up Converter On/Off Control. Drive ONSU high to turn on the step-up converter. All other control
pins are locked out until 2ms after the step-up output has reached its final value. This pin has an
internal 330kΩ resistance to GND.
Reference Output. Bypass REF to GND with a 0.1µF or greater capacitor. The maximum allowed load
on REF is 200µA. REF is actively pulled to GND when all converters are shut down.
Step-Up Converter Feedback Input. To regulate OUTSU to 3.35V, connect FBSELSU to GND. FBSU
may be connected to OUTSU or GND. For other output voltages, connect FBSELSU to OUTSU and
connect a resistive voltage-divider from OUTSU to FBSU to GND. The FBSU feedback threshold is
1.25V. This pin is high impedance in shutdown.
Step-Up Converter Compensation Node. Connect a series RC from COMPSU to GND to compensate
the control loop. COMPSD is pulled to GND in normal shutdown and during thermal shutdown (see
the Step-Down Compensation section).


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