04S_05XC6372 02.09.12 14:46 ページ 451
Series
Dual Mode [PWM/PFM] Step‐Up DC/DC Controllers/Converters
NCMOS Low Power Consumption
■Applications
GCellular phones, pagers
NOperating Voltage
:0.9V~10.0V
:2.0V~7.0V
GPalmtops
NOutput Voltage Range
GCameras, video recorders
GPortable equipment
NOutput Voltage Accuracy: 2.5%
NSelectable Oscillator Frequency
:50kHz, 100kHz,
180kHz
4
■General Description
■Features
The XC6372 series, unlike the conventional PWM controlled converters,
are a group of step-up DC/DC converters that automatically change their
operation modes into PFM modes while loads are light, such as when
the duty ratios are less than 10%.
Operating (start-up) voltage range
: 0.9V~10V
Output voltage range : 2.0V~7.0V in 0.1V increments
Highly accurate
: Set-up voltage 2.ꢀ%
When loads are light, as in the stand-by mode, the XC6372 changes to
PFM control so as to decrease oscillator frequencies, resulting in
reduced supply current.
Oscillator frequency : ꢀ0kHz, 100kHz, 180kHz ( 1ꢀ%ꢁ
selectable
Maximum output currents (Tr built-in)
: Typ.100mA @ VIN=3.0,
Therefore, the XC6372 is suitable for use with portable equipment that
requires the PWM controlled performance of low ripple and high output
current, and a supply current that varies between low and high. Built-in
proprietary phase compensation and soft start-up circuits ensure
excellent transient response and improved performance.
VOUT=ꢀ.0V....Note(1ꢁ
Highly efficient (Tr built-in)
: Typ.8ꢀ% @ VIN=3.0V,
VOUT=ꢀ.0V.....Note(1ꢁ
Output voltage can be selected from 2.0V to 7.0V in 0.1V increments
(accuracy: 2.ꢀ%ꢁ. Oscillator frequency is also selectable from three
frequencies; ꢀ0, 100, and 180kHz (accuracy: 1ꢀ%ꢁ.
Both switching transistor built-in and external Tr types are
available.
Five-lead packaged units offer either Chip Enable or
independent VOUT pin option.
Every built-in switching transistor type enables a step-up circuit to be
configured using only three external components; a coil, a diode, and a
capacitor. External transistor versions are available to accommodate
high output current applications.
Phase compensation and soft startup circuits included.
Small package
: SOT-89 mini-power mold (3-pin, ꢀ-pinꢁ
Note(1ꢁ: Performance depends on external components and
PCB layout.
SOT-89 small package.
■Typical Application Circuit
■Typical Performance
Characteristic
SD
VOUT
XC6372A301PR
L
L＝100μH（CＲ54），CL＝47μF（Tantalum）�
100
2.7V
VIN
80
SOT-89�
(TOP VIEW)
CIN
CL�
（Tantalum）�
60
40
20
0
VIN=0.9V
1
2
3
�
1.8V
1.2V
10
1.5V
GND
0.1
1
100
1000
Output Voltage:IOUT (mA)
451
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