XC6372 Series
x
CMOS Low Power Consumption
x
Operating Voltage: 0.9V~10.0V
x
Output Voltage Range: 2.0V~7.0V
x
Output Voltage Accuracy:
鹵2.5%
x
Selectable Oscillator Frequency:
(50kHz, 100kHz, 180kHz)
Dual Mode [PWM/PFM] Step-up DC/DC Converters
HP010199
s
Applications
q
Cellular phones, pagers
q
Palmtops
q
Cameras, video recorders
q
Portable equipment
s
General Description
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%.
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.
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 slow start-up circuits ensure excellent
transient response and improved performance.
Output voltage can be selected from 2.0V to 7.0V in 0.1V increments
(accuracy:
鹵2.5%).
Oscillator frequency is also selectable from three
frequencies; 50, 100, and 180kHz (accuracy:
鹵15%).
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.
SOT-89 small package.
s
Features
Operating (start-up) voltage range:0.9V~10V
Output voltage range:
2.0V~7.0V in 0.1V increments
Highly accurate:
Set-up voltage
鹵2.5%
Oscillator frequency:
50kHz, 100kHz, 180kHz (鹵15%) selectable
Maximum output currents (Tr built-in):
Typ.100mA
at V
IN
=3.0,V
OUT
=5.0V....Note(1)
Highly efficient (Tr built-in):
Typ.85%
at V
IN
=3.0V, V
OUT
=5.0V.....Note(1)
Both switching transistor built-in and external Tr types are available.
Five-lead packaged units offer either Chip Enable or independent
V
OUT
pin option.
Phase compensation and slow startup circuits included.
Small package:
SOT-89 mini-power mold (3-pin, 5-pin)
Note(1):
Performance depends on external components and PCB layout.
s
Selection Guide
PART TYPE
OPERATION
MODE
PWM/PFM
PACKAGE
SWITCHING
RELATED
Built-in Transistor
"Lx"lead
External Transitor
"EXT"lead
Built-in Transitor
"Lx"lead
External Transitor
"EXT"lead
Built-in Transitor
"Lx"lead
External Transitor
"EXT"lead
ADDITIONAL
FUNCTION
------------
FEATURES
鈥?/div>
Switching transistor incorporated standard
鈥?/div>
PFM operation during light loads.
XC6372A
SOT-89-3
type.
XC6372B
PWM/PFM
SOT-89-3
------------
鈥?/div>
External switching transistor standard type.
鈥?/div>
Adding external transistor can improve the
output capability up to several hundred mA.
Chip Enable(CE)
(CE) function added version to the
XC6372A
鈥?/div>
Stand-by current: 0.5碌A max.
鈥?/div>
Stand-by
鈥?/div>
Stand-by
XC6372C
PWM/PFM
SOT-89-5
XC6372D
PWM/PFM
SOT-89-5
Chip Enable(CE)
Separated
"V
DD
"and"V
OUT
"leads
Separated
"V
DD
"and"V
OUT
"leads
(CE) function added version to the
XC6372B
鈥?/div>
Stand-by current: 0.5碌A max.
鈥?/div>
Individual
XC6372E
PWM/PFM
SOT-89-5
power supply and set-up voltage
sensing leads are available
power supply and set-up voltage
sensing leads are available.
XC6372F
PWM/PFM
SOT-89-5
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