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PDF A7320 Data sheet ( Hoja de datos )

Número de pieza A7320
Descripción 2A 23V SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
Fabricantes AiT Semiconductor 
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No Preview Available ! A7320 Hoja de datos, Descripción, Manual

AiT Semiconductor Inc.
www.ait-ic.com
A7320
DC-DC CONVERTER/ BUCK (STEP-DOWN)
2A, 23V SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
DESCRIPTION
The A7320 is a monolithic synchronous buck
regulator. The device integrates 130mΩ
MOSFETS that provide 2A continuous load
current over a wide operating 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. Shutdown mode drops the supply
current to 1μA.
This device, available in an 8-pin SOP package,
provides a very compact system solution with
minimal reliance on external components.
A7320 is available in SOP8 Package
ORDERING INFORMATION
Package Type
Part Number
SOP8
M8
A7320M8R
A7320M8VR
Note
V: Halogen free Package
R : Tape & Reel
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
FEATURES
2A Output Current
Wide 4.75V to 23V Operating Input Range
Integrated 130mΩ Power MOSFET Switches
Output Adjustable from 0.923V to 20V
Up to 93% Efficiency
Programmable Soft-Start
Stable with Low ESR Ceramic Output Capacitors
Fixed 450KHz Frequency
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Available in SOP8 Package
APPLICATIONS
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Notebook Computers
TYPICAL APPLICATION
REV1.1
- FEB 2012 RELEASED, JUN 2012 REVISED –
-1-

1 page




A7320 pdf
AiT Semiconductor Inc.
www.ait-ic.com
A7320
DC-DC CONVERTER/ BUCK (STEP-DOWN)
2A, 23V SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
Parameter
Input Under Voltage Lockout
Threshold
Input Under Voltage Lockout
Threshold Hysteresis
Soft-Start Current
Soft-Start Period
Thermal ShutdownNote4
NOTE4: Guaranteed by design, not tested.
Symbol
Conditions
VIN Rising
VSS = 0V
CSS = 0.1μF
Min Typ. Max Units
3.80 4.10 4.40
V
210 mV
6 μA
15 ms
160 °C
REV1.1
- FEB 2012 RELEASED, JUN 2012 REVISED –
-5-

5 Page





A7320 arduino
AiT Semiconductor Inc.
www.ait-ic.com
A7320
DC-DC CONVERTER/ BUCK (STEP-DOWN)
2A, 23V SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
Where ILOAD is the load current. The choice of which style inductor to use mainly depends on the price vs. size
requirements and any EMI requirements.
Optional Schottky Diode
During the transition between high-side switch and low-side switch, the body diode of the low-side power
MOSFET conducts the inductor current. The forward voltage of this body diode is high. An optional Schottky
diode may be paralleled between the SW pin and GND pin to improve overall efficiency.
Input Capacitor
The input current to the step-down converter is discontinuous, therefore a capacitor is required to supply the
AC current to the step-down converter while maintaining the DC input voltage. Use low ESR capacitors for the
best performance. Ceramic capacitors are preferred, but tantalum or low-ESR electrolytic capacitors may also
suffice. Choose X5R or X7R dielectrics when using ceramic capacitors. Since the input capacitor (C1)
absorbs the input switching current it requires an adequate ripple current rating. The RMS current in the input
capacitor can be estimated by:
The worst-case condition occurs at VIN = 2VOUT, where IC1 = ILOAD/2. For simplification, choose the input
capacitor whose RMS current rating greater than half of the maximum load current.
The input capacitor can be electrolytic, tantalum or ceramic. When using electrolytic or tantalum capacitors, a
small, high quality ceramic capacitor, i.e. 0.1μF, should be placed as close to the IC as possible. When using
ceramic capacitors, make sure that they have enough capacitance to provide sufficient charge to prevent
excessive voltage ripple at input. The input voltage ripple for low ESR capacitors can be estimated by:
Where C1 is the input capacitance value.
REV1.1
- FEB 2012 RELEASED, JUN 2012 REVISED –
- 11 -

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