04S_08XC6381 02.09.12 14:52 ページ 475
Series
PFM Controlled, Step‐Up DC/DC Converters (Duty Ratio 58%)
NDuty
58%
NCMOS
Low Power Consumption
NOperating
Voltage
NOutput
Voltage Range
: 0.9V~10.0V
: 2.0V~7.0V
■Applications
GCellular
phones, pagers
GPalmtops
GCameras,
video recorders
GPortable
equipment
NOutput
Voltage Accuracy : ±2.5%
4
■General Description
The XC6381 series is a group of PFM controlled step-up DC/DC
converters.
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: ±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.
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 V
DD
pin
function (separated power and voltage detect pins).
SOT-23, SOT-25, and SOT-89-5 super mini-mold packages.
■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 ±2.5%
Maximum oscillator frequency
: 155kHz (±15%)
Duty Ratio
: 58% (±5%)
Both built-in switching transistor and external types are
available
Five-lead packaged units offer either Chip Enable or
independent V
OUT
pin option.
Small package
: SOT-23, 25 mini-mold (3-pin, 5-pin)
SOT-89, 89-5 mini-power mold
(3-pin, 5-pin)
■Typical Application Circuit
L
2
1
■Typical Performance
Characteristic
XC6381A301
L=100μH,C=47μF（Tantalum）
V
IN
C
IN
SOT-23
(TOP VIEW)
100
Efficiency:EFFI（％）
3
V
OUT
SD
C
L
（Tantalum）
80
V
IN
=2.0V
60
40
20
0
0.9V
1.2V
1.5V
1.8V
GND
0
20
40
60
80
100
Output Current:I
OUT
（mA）
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04S_08XC6381 02.09.12 14:52 ページ 477
XC6381
Series
■Product Classification
GSelection
Guide
PART TYPE
XC6381A
DUTY
RATIO
58%
PACKAGE
SOT-23,
SOT-89
SOT-25,
SOT-89-5
SOT-25,
SOT-89-5
SWITCHING
RELATED
Built-in Transistor
"Lx" lead
Built-in Transistor
"Lx" lead
Built-in Transistor
"Lx" lead
ADDITIONAL
FUNCTION
–
•
Accommodates
FEATURES
a duty ratio of 58%.
XC6381C
58%
Chip enable(CE)
(CE) function added version to the
XC6381A.
•
Stand-by current: 0.5µA max.
•
Stand-by
XC6381E
58%
•
Independent power supply and set-up voltage
Separated
"V
DD
" and "V
OUT
" leads sensing leads allow designing of PFM controllers.
4
GOrdering
Information
XC6381qwerty
XC6381 Series
A
q
C
E
w
e
r
1
M
t
P
y
R
L
Package
PFM Controlled Duty 58%
3-pin. Built-in switching transistor
Stand-by capability. (5-pin) Built-in switching transistor
Separated V
DD
and V
OUT
. (5-pin) Built-in switching transistor
Output Voltage
e.g.V
OUT
=3.5V
➔
w=3, e=5
Maximum Oscillator Frequency
Package
q=A~B
q=C~F
q=A~B
q=C~F
155kHz
SOT-23
SOT-25
SOT-89
SOT-89-5
Embossed tape : Standard Feed
Embossed tape : Reverse Feed
477
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