05S_1XC9201/9202新規 02.09.12 15:16 ページ 535
Series
PWM Controlled Step-Down DC/DC Converters
ꢁInput Voltage Range
ꢁOutput Voltage Range
: 2.5V ~20V
: 1.2V ~ 16V
■Applications
ꢀMobile, Cordless phones
ꢀPalm top computers, PDAs
ꢀPortable games
ꢁOscillation Frequency Range : 100kHz ~
600kHz
ꢀCameras, Digital cameras
ꢀLaptops
ꢁOutput Current
: up to 3.0A
ꢁCeramic Capacitor Compatible
ꢁMSOP-8A Package
5
■General Description
The XC9201 series are step-up multiple current and voltage feedback
DC/DC controller ICs. Current sense, clock frequencies and amp
feedback gain can all be externally regulated.
■Features
ꢀStable Operations via Current & Voltage Multiple Feedback
ꢀUnlimited Options for Peripheral Selection
ꢀCurrent Protection Circuit
A stable power supply is possible with output currents of up to 3.0A.With
output voltage fixed internally, VOUT is selectable in 0.1V steps within a
1.2V - 16.0V range ( 2.5%).
ꢀCeramic Capacitor Compatible
For output voltages outside this range, we recommend the FB version
which has a 0.9V internal reference voltage. Using this version, the
required output voltage can be set-up using 2 external resistors.
Switching frequencies can also be set-up externally within a range of
100~600 kHz and therefore frequencies suited to your particular
application can be selected.
With the current sense function, peak currents (which flow through the
driver transistor and the coil) can be controlled. Soft-start time can be
adjusted using external resistors and capacitors.
During shutdown (CE pin =L), consumption current can be reduced to as
little as 0.5µA (TYP.) or less and with U.V.L.O
(Under Voltage Lock Out) built-in, the external transistor will be
automatically shut off below the regulated voltage.
■Typical Application Circuit
■Typical Performance
Characteristic
22μH
V
OUT:5.0V FOSC:330kHz
XP132A11A1SR
100
80
60
40
20
1 EXT
2 Isen
Vss 8
VOUT 7
GAIN 6
CLK 5
U3FWJ44N
33m�
3 VIN
240k�
V
IN=5.4V
7.2V
10.0V
12.0V
15.0V
4 CE/SS
40μF+220μF
94μF
0.33μF
1μF
470pF
10K�
220pF
0
0.1
1
10
100
1000 10000
Output Current:IOUT(mA)�
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