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ML1565 데이터시트(PDF) 10 Page - Minilogic Device Corporation Limited

부품명 ML1565
상세설명  Step-Up-Down DC-DC Converts
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제조업체  MINILOGIC [Minilogic Device Corporation Limited]
홈페이지  http://www.minilogic.com.hk
Logo MINILOGIC - Minilogic Device Corporation Limited

ML1565 데이터시트(HTML) 10 Page - Minilogic Device Corporation Limited

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P10/21
Rev. C, Sep 2005
ML1565
Detailed Description (1)
The ML1565 is a complete digital still camera power con-
version IC. It can accept input from a variety of sources
including single-cell Li+ batteries, 2-cell alkaline or NiMH
batteries, as well as systems designed to accept both
battery types. The ML1565 includes five DC-to-DC con-
verter channels to generate all required voltages.
1)
Synchronous rectified step-up DC-to-DC converter
with on-chip MOSFETs--This typically supplies 3.3V
for main system power.
2)
Synchronous rectified step-down DC-to-DC converter
with on-chip MOSFETs ---Powering the stepdown
from the step-up output provides efficient (up to 90%)
buck-boost functionality that supplies a regulated
output when the battery voltage is above or below the
output voltage. The step-down can also be powered
from the battery.
3)
Auxiliary DC-to-DC Controller 1 -- Typically used for
5V output for motor, strobe, or other functions as
required.
4)
Auxiliary DC-to-DC Controller 2--Typically supplies
LCD bias voltages with either a multi-output flyback
transformer, or boost converter with charge pump
inverter. Alternately may power white LEDs for LCD
backlighting.
5)
Auxiliary DC-to-DC Controller 3
Typically supplies
CCD bias voltages with either a multi-output flyback
transformer, or boost converter with charge pump
inverter.
All ML1565 DC-to-DC converter channels employ fixed
frequency PWM
operation.
In
addition to multiple
DC-to-DC channels, the ML1565 also includes overload
protection, soft-start circuitry, adjustable PWM operating
frequency, and a power-OK(POK) output to signal when
the step-down converter output voltage (for CPU core) is
in regulation.
Step-up DC-to-DC Converter
The step-up DC-to-DC converter channel generates a
2.7V to 5.5V output voltage range from a 0.9V to 5.5V
battery input voltage. An internal switch and synchronous
rectifier allow conversion efficiencies as high as 95% while
reducing both circuit size and the number of external
com ponents. Under m oderate to heavy loading,
The converter operates in a low-noise PWM mode with
constant frequency. Switching harmonics generated by
fixed-frequency operation are consistent and easily filtered.
The step-up is a current-mode PWM. An error signal (at
COMPSU) represents the difference between the feedback
voltage and the reference. The error signal programs the
inductor current to regulate the output voltage. At light
loads (under 75mA when boosting from 2V to 3.3V),
efficiency is enhanced by burst mode in which switching
occurs only as needed to service the load. In this mode, the
inductor current peak is limited to typically 200mA for each
pulse.
Step-Down DC-to-DC Converter
The step-down DC-to-DC converter channel is optimized
for generating output voltages down to 1.25V. Lower output
voltages can be set by adding an additional resistor (see
the Applications Information section). An internal switch
and synchronous rectifier allow conversion efficiencies as
high as 95% while reducing both circuit size and the
number of external components. Under moderate to heavy
loading, the converter operates in a low-noise PWM mode
with constant frequency. Switching harmonics generated
by fixed-frequency, operation are consistent and easily
filtered. The step-down is a current-mode PWM. An error
signal (at COMPSD) represents the difference between the
feedback voltage and the reference. The error signal
programs the inductor current to regulate the output
voltage. At light loads (under 120 mA), efficiency is
enhanced by burst mode in which switching occurs only as
needed to service the load. In this mode, the inductor
current peak is limited to 150mA (typ) for each pulse.
The step-down remains inactive until the step-up DC-to-DC
is in regulation. This means that the step-down DC-to-DC
on/off pin (ONSD) is overridden by ONSU. The soft-start
sequence for the step-down begins 1024 OSC cycles after
the step-up output is in regulation. If the step-up,
step-down, or any of the auxiliary controllers remains
faulted for 200ms, all channels turn off. The step-down also
features and open-drain SDOK output that goes low when
the output is in regulation.


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