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A7122 Datasheet(PDF) 10 Page - AIT Components Ltd.

No. de Pieza. A7122
Descripción  DC-DC CONVERTER BUCK SYNCHRONOUS BUCK CONVERTER
Descarga  13 Pages
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Fabricante  AITCOMPONENTS [AIT Components Ltd.]
Página de inicio  http://aitcomponents.com
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A7122 Datasheet(HTML) 10 Page - AIT Components Ltd.

 
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AiT Semiconductor Inc.
www.ait-ic.com
A7122
DC-DC CONVERTER BUCK (STEP-DOWN)
2A 3MHz 6V SYNCHRONOUS BUCK CONVERTER
REV1.1
- JUL 2012 RELEASED, DEC 2014 UPDATED -
- 10 -
For example, for VOUT
=1.8V, L=1μH, COUT=10μF, for VOUT =1.2V, L=0.47μH, COUT=22μF
Setting Output Voltage
Output voltages are set by external resistors. The FB_ threshold is 0.6V.
RTOP = RBOTTOM x [(VOUT / 0.6) - 1]
Guidelines for Input Capacitor and Output Capacitor
The input capacitor in a DC-to-DC converter reduces current peaks drawn from the battery or other input
power source and reduces switching noise in the controller. The impedance of the input capacitor at the
switching frequency should be less than that of the input source so high-frequency switching currents do not
pass through the input source. The output capacitor keeps output ripple small and ensures control-loop
stability. The output capacitor must also have low impedance at the switching frequency. Ceramic, polymer,
and tantalum capacitors are suitable, with ceramic exhibiting the lowest ESR and high-frequency impedance.
Output ripple with a ceramic output capacitor is approximately as follows:
VRIPPLE = IL(PEAK)
[1 / (2π x fOSC x COUT)]
If the capacitor has significant ESR, the output ripple component due to capacitor ESR is as follows:
VRIPPLE(ESR) = IL(PEAK) x ESR


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