04S_08XC6381 02.09.12 14:52 ページ 475
Series
PFM Controlled, Step‐Up DC/DC Converters (Duty Ratio 58%)
NDuty 58%
■Applications
GCellular phones, pagers
NCMOS Low Power Consumption
GPalmtops
NOperating Voltage
: 0.9V~10.0V
: 2.0V~7.0V
GCameras, video recorders
GPortable equipment
NOutput Voltage Range
NOutput Voltage Accuracy: 2.5%
4
■General Description
The XC6381 series is a group of PFM controlled step-up DC/DC
converters.
■Features
Operating (start-up) voltage range
: 0.9V~10V
The XC6381 series employs CMOS process and laser trimming
technologies so as to attain low power and high accuracy.
Max. oscillator frequency is trimmed to 155kHz (accuracy: 15ꢀ%.
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.
Output voltage range : 2.0V~7.0V in 0.1V increments
Highly accurate
Maximum oscillator frequency
: 155kHz ( 15ꢀ%
: 58ꢀ ( 5ꢀ%
: Set-up voltage 2.5ꢀ
Duty Ratio
Both built-in switching transistor and external types are
available
Both built-in and external transistor types include 5-pin and 3-pin
packages, which are provided with either a CE (chip enable% function that
reduces power consumption during shut-down mode, or a VDD pin
function (separated power and voltage detect pins%.
Five-lead packaged units offer either Chip Enable or
independent VOUT pin option.
Small package
: SOT-23, 25 mini-mold (3-pin, 5-pin%
SOT-89, 89-5 mini-power mold
(3-pin, 5-pin%
SOT-23, SOT-25, and SOT-89-5 super mini-mold packages.
■Typical Application Circuit
■Typical Performance
Characteristic
2
1
L
XC6381A301
L=100μH,C=47μF(Tantalum)�
100
SOT-23�
(TOP VIEW)
VIN
CIN
80
3
V
IN=2.0V
VOUT
60
40
20
0
0.9V
1.2V
1.5V
1.8V
SD
CL�
(Tantalum)�
GND
0
20
40
60
80
100
Output Current:IOUT(mA)�
475