AP3211 datasheet(2/12 Pages) BCDSEMI

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Data Sheet

1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER

AP3211

Jul. 2011

Rev. 1.3

BCD Semiconductor Manufacturing Limited

1 Dot by Marking

GND

Pin Configuration

K Package

(SOT-23-6)

Figure 2. Pin Configuration of AP3211 (Top View)

Pin Description

Pin Number

Pin Name

Function

Bootstrap pin. A bootstrap capacitor is connected between the

BS pin and SW pin. The voltage across the bootstrap capacitor

drives the internal high-side NMOS switch

GND

Ground pin

Feedback pin. This pin is connected to an external resistor

divider to program the system output voltage. When VFB exceeds

20% of the nominal regulation value of 0.81V, the OVP is

triggered. When VFB＜0.25V, the oscillator frequency is lowered

to realize short circuit protection

Control input pin. Forcing this pin above 1.5V enables the IC.

Forcing this pin below 0.4V shuts down the IC. When the IC is

in shutdown mode, all functions are disabled to decrease the

supply current below 1

μA

Supply input pin. A capacitor should be connected between the

IN pin and GND to keep the DC input voltage constant

Power switch output pin. This pin is connected to the inductor

and bootstrap capacitor

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