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PDF A7230 Data sheet ( Hoja de datos )
| Número de pieza | A7230 | |
| Descripción | WIDE INPUT RANGE STEP-DOWN CONVERTER | |
| Fabricantes | AiT Semiconductor | |
| Logotipo |  |
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AiT Semiconductor Inc.
www.ait-ic.com
A7230
3A, 18V SYNCHRONOUS, WIDE INPUT RANGE
STEP-DOWN CONVERTER
DESCRIPTION
FEATURES
The A7230 is a monolithic synchronous buck
3A Output Current
regulator. The device integrates 100mΩ MOSFETS Wide 4.75V to 18V Operating Input Range
that provide 3A continuous load current over a wide Integrated 100mΩ Power MOSFET Switches
operating input voltage of 4.75V to 18V. Current mode Output Adjustable from 0.925V to 15V
control provides fast transient response and
Up to 95% Efficiency
cycle-by-cycle current limit.
Programmable Soft-Start
Stable with Low ESR Ceramic Output Capacitors
An adjustable soft-start prevents inrush current at
Fixed 370KHz Frequency
turn-on. In shutdown mode, the supply current drops Cycle-by-Cycle Over Current Protection
below 1μA.
Input Under Voltage Lockout
Available in PSOP8 package
The A7230 provides a very compact system solution
with minimal reliance on external components.
APPLICATION
The A7230 is available in PSOP8 Package.
ORDERING INFORMATION
Package Type
Part Number
PSOP8
A7230MP8R
MP8
A7230MP8VR
Note
R: Tape & Reel
V: Green Package
AiT provides all Pb free products
Suffix “ V “ means Green Package
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
TYPICAL APPLICATION
REV1.0
- MAR 2011 RELEASED -
-1-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A7230
3A, 18V SYNCHRONOUS, WIDE INPUT RANGE
STEP-DOWN CONVERTER
APPLICATION CIRCUIT
Figure 1. Typical Application Circuit
Figure 2. Typical Efficiency Curve, VOUT=5V
Figure 3. A7230 with 3.3V output,
2x22uF Ceramic Output Capacitor
REV1.0
- MAR 2011 RELEASED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
A7230
3A, 18V SYNCHRONOUS, WIDE INPUT RANGE
STEP-DOWN CONVERTER
Output Capacitor
The output capacitor is required to maintain the DC output voltage. Ceramic, tantalum, or low ESR electrolytic
capacitors are recommended. Low ESR capacitors are preferred to keep the output voltage ripple low. The
output voltage ripple can be estimated by:
Where C2 is the output capacitance value and RESR is the equivalent series resistance (ESR) value of the
output capacitor. In the case of ceramic capacitors, the impedance at the switching frequency is dominated by
the capacitance. The output voltage ripple is mainly caused by the capacitance. For simplification, the output
voltage ripple can be estimated by:
In the case of tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching
frequency. For simplification, the output ripple can be approximated to:
The characteristics of the output capacitor also affect the stability of the regulation system. The A7230 can be
optimized for a wide range of capacitance and ESR values.
Compensation Components
A7230 employs current mode control for easy compensation and fast transient response. The sys- tem
stability and transient response are controlled through the COMP pin. COMP pin is the output of the internal
transconductance error amplifier. A series capacitor-resistor combination sets a pole-zero combination to
control the characteristics of the control system. The DC gain of the voltage feedback loop is given by:
REV1.0
- MAR 2011 RELEASED -
- 11 -
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet A7230.PDF ] | |
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