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QX2303 Datasheet Preview

QX2303 Datasheet

PFM Step-Up DC-DC Converter

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QX2303
PFM Step-Up DC-DC Converter
General Description
The QX2303 Series are PFM step-up DC-DC converters
with very low ripple noise due to the high operation
frequency. The maximum operation frequency is
260KHz.
Only three components are required to realize the
conversion from the battery voltage to a selected output
voltage.
A driver pin (EXT) is provided for driving external
power transistor to extend the output current capability
where large current is required.
Enable pin (EN) is also provided so that the circuit can
be powered down.
Ordering Information
QX2303 X X X X
Package Type:
T: SOT-23-3
F: SOT-23-5
E: SOT-89
Output Voltage:
20: 2.0V
21: 2.1V
49: 4.9V
50: 5.0V
External switch
E: use external switch
L: use internal switch
Features
y 260KHz Maximum Operation Frequency
y 2.0V to 5.0V Output Voltage With 0.1V
Step
y Low Start-up Voltage: 0.8V at 1mA
y ±2.5% Output Voltage Accuracy
y Up to 87% Efficiency
y Output current: 300mA at 2.5V input, 3.3V
output
y Low Ripple and Low Noise
y Output Current Extendable by External
Switch
Applications
y Power source for applications where a
higher voltage than the battery voltage is
required
y One to three cell battery devices
y Power source for cameras, camcorders,
VCRs, PDAs, LED and hand held
communication instrument
Typical Applications
L
33uH
+
-
VIN
1N5819
QX2303LXXE
LX VOUT
GND
VOUT
C
47uF
L
33uH
+
-
VIN
ZTX650
Cb
0.01uF
300
Rb
1N5819
QX2303EXXE
EXT VOUT
GND
VOUT
C
47uF
SHIWEI SEMICONDUCTOR Co.,LTD.




SHIWEI

QX2303 Datasheet Preview

QX2303 Datasheet

PFM Step-Up DC-DC Converter

No Preview Available !

QX2303
Block Diagram
Current
limiting
- comparator
LX +
EXT
Error
buffer
PFM
Amplifier
+
control
-
Chip
EN Enable
OSC
260KHz
1.24V
bandgap
VOUT
GND
Pin Assignment
Pin
Name
QX2303
LXXT
SOT-23-3
Part Marking and Package Type
QX2303
LXXF
SOT-23-5
QX2303
LXXE
SOT-89
QX2303
EXXT
SOT-23-3
QX2303
EXXF
SOT-23-5
QX2303
EXXE
SOT-89
Description
LX
EXT
VOUT
EN
GND
NC
2
-
3
-
1
-
53 -
- -2
223
1- -
411
3- -
5 - Switching pin
3 3 Buffer output for external transistor
2 2 Output voltage
1 - Chip enable (active high)
4 1 Ground
- - No connection
VOUT
3
QX2303LXXT
(SOT-23-3)
12
GND LX
VOUT
3
QX2303EXXT
(SOT-23-3)
12
GND EXT
LX GND
54
QX2303LXXF
(SOT-23-5)
12 3
EN VOUT NC
LX GND
54
QX2303EXXF
(SOT-23-5)
12 3
EN VOUT EXT
QX2303LXXE
(SOT-89)
123
GND VOUT LX
QX2303EXXE
(SOT-89)
123
GND VOUT EXT
SHIWEI SEMICONDUCTOR Co.,LTD.


Part Number QX2303
Description PFM Step-Up DC-DC Converter
Maker SHIWEI
Total Page 10 Pages
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