04S_01XC9101/9102新規 02.09.12 14:37 ページ 387
Series
PWM Controlled Step-Up DC/DC Controllers
ꢁInput Voltage Range :2.5V ~ 20V
ꢁOutput Voltage Range
■Applications
ꢀMobile, Cordless phones
ꢀPalm top computers, PDAs
ꢀPortable games
:2.5V ~ 16V
(Fixed Voltage Type)
:30V + (Adjustable Type)
ꢀCameras, Digital cameras
ꢀLaptops
ꢁOscillation Frequency Range
:100kHz ~ 600kHz
:up to 1.5A
ꢁOutput Current
4
ꢁCeramic Capacitor Compatible
ꢁMSOP-8A Package
■General Description
The XC9101 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 1.5A.
With output voltage fixed internally, VOUT is selectable in 0.1V steps
within a 2.5V - 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 resistor and capacitor.
During shutdown (CE pin =L), consumption current can be reduced to
as little as 0.5µA (TYP.) or less.
■Typical Application Circuit
■Typical Performance
Characteristic
U3FWJ44N
22μH
VOUT:5.0V FOSC:180kHz
XP161A1355PR
100
Vss 8
1 EXT
VOUT 7
2 Isen
3 VIN
50m�
150k�
GAIN 6
CLK 5
80
4.2V
94μF
4 CE/SS
220μF�
+10μF
0.1μF
470pF
3.3V
22K�
1μF
180pF
60
40
VIN=2.5V
1
10
100
1000
Output Current : IOUT (mA)
387