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AX3803 Datasheet Preview

AX3803 Datasheet

500KHz Synchronous Rectified Step-Down Converter

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AX3803
3A, 23V, 500KHz Synchronous Rectified
Step-Down Converter
GENERAL DESCRIPTION
The AX3803 is a monolithic synchronous buck regulator. The device integrates two
110mΩ MOSFETs, and provides 3A of continuous load current over a wide input voltage of
4.75V to 23V. Current mode control provides fast transient response and cycle-by-Cycle
current limit.
Internal soft-start prevents inrush current at turn-on, and in shutdown mode the supply
current drops to 5μA.
This device, available in SOP-8L-EP package, provides a very compact solution with
minimal external components.
FEATURES
- 3A Output Current
- Wide 4.75V to 23V Operating Input Range
- Integrated 110mΩ Power MOSFET Switches
- Output adjust from VFB to 20V
- Internal compensation
- Up to 94% Efficiency
- Stable with Low ESR Ceramic Output Capacitors
- Fixed 500KHz Frequency
- Cycle-by-Cycle Over Current Protection
- Thermal shutdown and short circuit protections
BLOCK DIAGRAM
FB 5
OSCILLATOR
140/500KHz
RAMP
CLK
NC 8
0.925V
-
+
+
ERROR
AMPLIFIER
6μA
NC 6
EN 7
+
1.5V -
SHUTDOWN
COMPARATOR
CURRENT
SENSE
AMPLIFIER
+ SQ
RQ
- CURRENT
COMPARATOR
2 IN
+
5V
-
1 BS
M1
110mΩ
3 SW
M2
110mΩ
4 GND
EN
IN
INTERNAL
REGULATORS
5V
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Nov.22, 2012




AXElite

AX3803 Datasheet Preview

AX3803 Datasheet

500KHz Synchronous Rectified Step-Down Converter

No Preview Available !

AX3803
PIN ASSIGNMENT
The package of AX3803 is SOP-8L-EP; the pin assignment is given by:
Name
Description
High-Side Gate Drive Boost Input. BS
supplies the drive for the high-side
BS N-Channel MOSFET switch. Connect a
0.01μF or greater capacitor from SW to
BS to power the high side switch.
Power Input. IN supplies the power to
the IC, as well as the step-down
converter switches. Drive IN with a
IN 4.75V to 23V power source. Bypass IN
( Top View )
to GND with a suitably large capacitor
to eliminate noise on the input to the IC.
BS 1
8 NC
See Input Capacitor.
Power Switching Output. SW is the
IN 2
SW 3
Exposed
Pad
(GND)
7 EN
6 NC
switching node that supplies power to
SW
the output. Connect the output LC filter
from SW to the output load. Note that a
capacitor is required from SW to BS to
GND 4
5
FB
power the high-side switch.
GND Ground.
SOP-8L-EP
Feedback Input. FB senses the output
voltage to regulate that voltage. Drive
FB
FB with a resistive voltage divider from
the output voltage. The feedback
threshold is 0.925V. See Setting the
Output Voltage.
NC Not connect
Enable Input. EN is a digital input that
turns the regulator on or off. Drive EN
EN high to turn on the regulator, drive it low
to turn it off. Pull up with 100kΩ resistor
for automatic startup.
RDER/MARKING INFORMATION
Order Information
AX3803 XX X
Package Type Packing
ES: SOP-8L-EP Blank: Tube
A : Taping
Top Marking
Logo
AX 3 8 0 3
Y Y W WX
Part number
ID code:internal
WW: 01~52
Year: 11=2011
12=2012
:
:
19=2019
2/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Nov.22, 2012


Part Number AX3803
Description 500KHz Synchronous Rectified Step-Down Converter
Maker AXElite
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