XR2204D
______________________________________ ____________________________________________________ ________________________________
1.2MHZ，14V Step-up DC/DC Converter
GENERAL DESCRIPTION
The XR2204D is a high frequency, high
efficiency DC to DC converter with an
integrated 4A, 0.1Ω power switch capable
of providing an output voltage up to 14V.
The fixed 1.2MHz allows the use of small
external inductions and capacitors and
provides fast transient response. It
integrates Soft start, Comp,. only need few
components outside.
FEATURES
1.6V to 6V input voltage Rangel
Efficiency up to 96%
14V Boost converter with 4A switch
current
1.2Mhz fixed Switching Frequency
Integrated soft-start
Thermal Shutdown
Under voltage Lockout
ESD 8KV Pass( HBM )
8-Pin SOP-PP Package
APPLICATIONS
Handheld Devices
GPS Receiver
Digital Still Camera
Portable Applications
DSL Modem
PCMCIA Card
TFT LCD Bias Supply
Figure 1. Typical Application Circuit1
Suzhou XySemi Electronic Technology Co., Limited.
-1-
www.xysemi.com.cn
REV0.7
XR2204D
______________________________________ ____________________________________________________ ________________________________
Figure 2. Typical Application Circuit2
Figure 3. Typical Application Circuit2
Notes: If the input voltage is below 2.5V, such as 2.0V or 1.8V. from two 1.5V dry cell series, Please
contact with Xysemi FAE for detail application information.
Suzhou XySemi Electronic Technology Co., Limited.
-2-
www.xysemi.com.cn
REV0.7
XR2204D
______________________________________ ____________________________________________________ _____________________________
ABSOLUTE MAXIMUM RATINGS
(Note: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating
conditions for long periods may affect device reliability.)
PARAMETER
VALUE
UNIT
Supply Voltage VIN
FB, EN Voltage
SW Voltage
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
-0.3 to 6.5
-0.3 to VIN+0.3
Vin+0.3 to 15V
-40 to 85
150
-55 to 150
300
V
V
V
°
C
°
C
°
C
°
C
ELECTRICAL CHARACTERISTICS
(V
IN
= 3.6V, T
A
= 25
C unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input Voltage Range
Boost output voltage range
Operating Supply Current
Shutdown Supply Current
Regulated Feedback
Voltage
Peak Inductor Current
Oscillator Frequency
Rds(ON) of N-channel FET
Enable Threshold
Enable Leakage Current
SW Leakage Current
V
IN
Vout
V
FB
=1.5V，EN=Vin, I
Load
=0
I
SUPPLY
V
EN
=0V, V
IN
=4.2V
1.6
14
75
0.1
1.21 1.24
4.0
0.9
I
SW
=-100mA
V
IN
= 1.6V to 5.5V
0.3
-0.1
V
EN
= 0V, V
SW
= 0V or 5V, V
IN
= 5V
1.2
0.1
1
6.0
V
V
135
µA
1
1.27
V
A
1.5
0.2
1.5
0.1
1
MHz
Ohm
V
µA
uA
V
FB
I
PEAK
F
OSC
Suzhou XySemi Electronic Technology Co., Limited.
-4-
www.xysemi.com.cn
REV0.7
XR2204D
______________________________________ ____________________________________________________ _____________________________
Figure 5. Functional Block Diagram
FUNCTIONAL DESCRIPTION
NORMAL OPERATION
The boost converter is designed for output
voltage up to 14V with a switch peak current limit of
4.0 A. The device, which operates in a current
mode scheme with quasi-constant frequency, is
externally 1.2MHZ and the minimum input voltage is
1.6 V. To control the inrush current at start-up a soft-
start pin is available.
During the on-time, the voltage across the
inductor causes the current in it to rise. When the
current reaches a threshold value set by the internal
GM amplifier, the power transistor is turned off, the
energy stored into the inductor is then released and
the current flows through the Schottky diode
towards the output of the boost converter. The off-
time is fixed for a certain Vin and Vs, and therefore
maintains the same frequency when varying these
parameters.
However, for different output loads, the
frequency may slightly change due to the voltage
Suzhou XySemi Electronic Technology Co., Limited.
-5-
www.xysemi.com.cn
REV0.7
drop across the Rdson of the power transistor
which will have an effect on the voltage across the
inductor and thus on
T
on
(
T
off
remains fixed).
Some slight frequency changes might also appear
with a fixed output load due to the fact that the
output voltage Vs is not sensed directly but via the
SW Pin, which affects accuracy.
Because of the quasi-constant frequency
behavior of the device , the XR2204D eliminates
the need for an internal oscillator and slope
compensation, which provides better stability for the
system over a wide of input and output voltages
range, and more stable and accurate current
limiting operation compared to boost converters
operating with a conventional PWM scheme .The
XR2204D topology has also the benefits of
providing very good load and line regulations, and
excellent load transient response.
电源技术
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
