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AX3484 Datasheet Preview

AX3484 Datasheet

340kHz Synchronous Rectified Step-Down Converter

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AX3484
3A, 23V, 340kHz Synchronous Rectified
Step-Down Converter
GENERAL DESCRIPTION
The AX3484 is a monolithic synchronous buck regulator. The device integrates two
100mΩ 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.
An adjustable soft-start prevents inrush current at turn-on, and in shutdown mode the
supply current drops to 1μA.
This device, available in an 8-pin SOP with exposed pad package, provides a very
compact solution with minimal external components.
FEATURES
- 3A Output Current
- Wide 4.75V to 23V Operating Input Range
- Integrated 100mΩ Power MOSFET Switches
- Output adjust from VFB to 20V
- Up to 95% Efficiency
- Programmable Soft-Start
- Stable with Low ESR Ceramic Output Capacitors
- Fixed 350KHz Frequency
- Cycle-by-Cycle Over Current Protection
- Thermal shutdown and short circuit protections
BLOCK DIAGRAM
FB 5
OSCILLATOR
90/350KHz
RAMP
CLK
SS 8
0.925V
-
+
+
ERROR
AMPLIFIER
6μA
CURRENT
SENSE
AMPLIFIER
+ SQ
RQ
- CURRENT
COMPARATOR
2 IN
+
5V
-
M1
100mΩ
1 BS
3 SW
M2
100mΩ
4 GND
COMP 6
EN 7
7V
Zener
+
1.5V -
SHUTDOWN
COMPARATOR
EN
IN
INTERNAL
REGULATORS
5V
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Sep.05, 2011




AXElite

AX3484 Datasheet Preview

AX3484 Datasheet

340kHz Synchronous Rectified Step-Down Converter

No Preview Available !

AX3484
PIN ASSIGNMENT
The package of AX3484 is SOP-8L-EP; the pin assignment is given by:
( Top View )
BS 1
IN 2
SW 3
GND 4
GND
8 SS
7 EN
6 COMP
5 FB
SOP-8L-EP
Name
Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel
BS 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
IN switches. Drive IN with a 4.75V to 23V power source. Bypass IN to GND with a suitably
large capacitor to eliminate noise on the input to the IC. See Input Capacitor.
Power Switching Output. SW is the switching node that supplies power to the output.
SW Connect the output LC filter from SW to the output load. Note that a capacitor is required
from SW to BS to power the high-side switch.
GND Ground.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a
FB resistive voltage divider from the output voltage. The feedback threshold is 0.925V. See
Setting the Output Voltage.
Compensation Node. COMP is used to compensate the regulation control loop. Connect
COMP
a series RC
some cases,
network from
an additional
COMP to
capacitor
GND to compensate the regulation control loop. In
from COMP to GND is required. See Compensation
Components.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn
EN on the regulator, drive it low to turn it off. Pull up with 100kΩ resistor for automatic
startup.
Soft-Start Control Input. SS controls the soft start period. Connect a capacitor from SS to
SS GND to set the soft-start period. A 0.1μF capacitor sets the soft-start period to 15ms. To
disable the soft-start feature, leave SS unconnected.
2/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Sep.05, 2011


Part Number AX3484
Description 340kHz Synchronous Rectified Step-Down Converter
Maker AXElite
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