PE2118 Просмотр технического описания (PDF) - Zetex => Diodes

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PE2118

Synchronous Boost DC/DC Regulator

Zetex => Diodes 

PE2118

Application Information

PIN ASSIGNMENT

SW (Pin 1): Switch Pin. Connect inductor between SW and VIN. Keep these PCB trace lengths

as short and wide as possible to reduce EMI and voltage overshoot.

GND (Pin 2): Signal and Power Ground. Provide a short direct PCB path between GND and the

(–) side of the output capacitor(s).

FB (Pin 3): Feedback Input to the gm Error Amplifier. Connect resistor divider tap to this pin. The

output voltage can be adjusted from 2.5V to 5V by: VOUT = 1.203V • [1 + (R1/R2)].

EN (Pin 4): Logic Controlled Shutdown Input. EN = High: Normal free running operation,

1.5MHz typical operating frequency. EN = Low: Shutdown, quiescent current <1µA. Output

capacitor can be completely discharged through the load or feedback resistors.

VOUT (Pin 5): Output Voltage Sense Input and Drain of the Internal Synchronous Rectifier

MOSFET. Bias is derived from VOUT. PCB trace length from VOUT to the output filter capacitor(s)

should be as short and wide as possible.

VIN (Pin 6): Battery Input Voltage. The device gets its start-up bias from VIN. Once VOUT exceeds

VIN, bias comes from VOUT. Thus, once started, operation is completely independent from VIN.

Operation is only limited by the output power level and the battery’s internal series resistance.

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