UPD121W33A データシートの表示（PDF） - NEC => Renesas Technology

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UPD121W33A

HIGH CURRENT 1.5 A GENERAL-PURPOSE CMOS REGULATOR

NEC => Renesas Technology 

μ PD121WxxA Series

CIN : 0.1 μ F or higher. Be sure to connect CIN to prevent parasitic oscillation. Set this value according to the length

of the line between the regulator and the INPUT pin. Use of a film capacitor or other capacitor with first-rate

voltage and temperature characteristics is recommended. If using a laminated ceramic capacitor, it is

necessary to ensure that CIN is 0.1 μ F or higher for the voltage and temperature range to be used.

COUT : 10 μ F or higher. Be sure to connect COUT to prevent oscillation and improve excessive load regulation. Place

CIN and COUT as close as possible to the IC pins (within 1 to 2 cm). Also, in case of using a laminated ceramic

capacitor, please note following items.

• It is necessary to ensure that COUT is 10 μ F or higher for the voltage and temperature range to be used.

• In case of using laminated ceramic capacitor, it is easy to become state of parasitic oscillation. Because

ESR of laminated ceramic capacitor is very low. Therefore, the capacitor and load condition (output current)

which fulfill the condition of the stable operation area of ESR shown below are recommended.

• Stable Operation Area as below is regulated under condition of which this product is not on a substrate.

Therefore impedance on substrate is not considered.

D1 : If the OUTPUT pin has a higher voltage than the INPUT pin, connect a diode.

D2 : If the OUTPUT pin has a lower voltage than the GND pin, connect a Schottky barrier diode.

R1, R2: The total amount of R1 and R2 is sure to below 500 kΩ (375 kΩ TYP.). R2 = 100 kΩ is recommended.

VOUT = (1 + R1/R2) VADJ Note

Note When VOUT = 3.0 V: R1 = 275 kΩ, R2 = 100 kΩ

Caution Make sure that no external voltage is applied to the OUTPUT pin.

μ PD121WxxA Series COUT ESR Stable Operation Area

Unstable Operation Area

10

1

Stable Operation Area

0.1

Unstable Operation Area

0.01

0

150 300 450 600 750 900 1050 1200 1350 1500

IO (mA)

Data Sheet G18852EJ1V0DS

5

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