Product Information

AX3484ESA

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Datasheet
DC-DC Converters Step-Down Adjustable 1 4.75V 23V 0.925V 20V 3A SOP-8_EP_150mil RoHS
Manufacturer: Axelite



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AX3484ESA
Axelite

1 : $ 0.5639
10 : $ 0.4198
30 : $ 0.3934
100 : $ 0.3669
500 : $ 0.3553
1000 : $ 0.3493

     
Manufacturer
Axelite
Product Category
Isolated DC/DC Converters
Number of Outputs
1
Category
Isolated Dc/Dc Converters
Rohs
Y
Package
Sop-8_Ep_150Mil
Brand Category
Axelite
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Adjustable
Voltage - Input Min
4.75 V
Voltage - Input Max
23 V
Voltage - Output Min/Fixed
0.925 V
Voltage - Output Max
20 V
Current - Output
3 A
Frequency - Switching
350Khz
Synchronous Rectifier
Yes
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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 100m 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 1A. 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 100m Power MOSFET Switches - Output adjust from V to 20V FB - 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 + OVP 2 IN CURRENT 1.1V - SENSE AMPLIFIER + RAMP OSCILLATOR 5V 5 FB + CLK - 90/350KHz 1 BS 0.3V - M1 + S Q 0.13 R - Q CURRENT SS 8 3 SW + - ERROR COMPARATOR 0.925V + AMPLIFIER M2 0.13 6 A GND 4 COMP 6 OVP EN IN<4.10V 2.7V + 1.2V EN OK LOCKOUT - COMPARATOR IN EN 7 + INTERNAL 5V REGULATORS SHUTDOWN 1.5V - COMPARATOR 1/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.3 Dec.21, 2017 AX3484 PIN ASSIGNMENT The package of AX3484 is SOP-8L-EP; the pin assignment is given by: ( ) Top View 1 8 SS BS 2 7 EN IN GND SW 3 6 COMP 4 5 GND 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 0.01F 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 a series RC network from COMP to GND to compensate the regulation control loop. In COMP some cases, an additional capacitor 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 100k 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 0.1F 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.1.3 Dec.21, 2017

Tariff Concession Code
Tariff Desc

9601650
8504.40.90 POWER SUPPLIES, having BOTH:
(a) input voltages of 176V-246VAC, 47Hz-63Hz single phase OR 200V-230VAC, 50Hz-60Hz single phase
(b) multiple DC output voltages from minus 200 V to positive 200V
TC 9603032

8504.40.90 CHARGERS, ADAPTERS AND INVERTERS, AC/DC OR DC/DC OR DC/AC having ALL of the following:
(a) input voltage NOT less than 10V and NOT greater than 252V
(b) output voltage NOT less than 2V and NOT greater than 252V
(c) wattage NOT less than 40 W and NOT greater than 160W
(d) output current NOT greater than 17A - TC 1021920

8504.50.10 81
(a) designed for use with equipment of 8471
(b) for telecommunication apparatus of 8517 Free

8504.40.90 POWER SUPPLY UNITS, DC AND/OR AC output, complying with AS/NZS 60950 & AS/NZS CISPR 22, having ALL of:
(a) voltage NOT less than 2.5 V and NOT greater than 55V
(b) wattage NOT less than 0.02 W and NOT greater than 105W
(c) current output NOT less than 0.01 amp and NOT greater than 2.5amp
TC 1014564

8504.40.90 POWER SUPPLY MODULES having ALL of the following:
(a) input power at EITHER of the following voltages:
(i) 120VAC/240VAC
(ii) 24VDC /48VDC
(b) output power at EITHER of the following voltages:
(i) 5VDC, +15VDC, -15VDC, and 24VDC field I/O
(ii) 24VDC field I/O only
(c) circuitry monitors
(d) output adjusters
TC 9810001

8504.40.90 POWER SUPPLIES DC having BOTH:
(a) variable voltage NOT exceeding 30V
(b) maximum current output NOT exceeding 25amps
TC 9900597

8504.40.90 CONVERTERS, DC/DC, power output not exceeding 5W, being ANY of:
(a) single in line package
(b) dual in line
(c) surface mount device
TC 9601650

8543.90.20 20 Electronic microassemblies Free

8504.40.30 Static converters
(a) separately housed units, designed to be housed in the same cabinet as the central processing unit of equipment of 8471
(b) for telecommunication apparatus of 8517
60 No Electric current rectifying assemblies Free
63 No Other Free

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