PM6644 データシートの表示（PDF） - STMicroelectronics

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PM6644

350 mA adjustable step-down regulator

STMicroelectronics 

PM6644

350 mA adjustable step-down regulator

Datasheet − production data

Features

■ 4.5 V to 25 V input voltage range

■ Output voltage VOUT: fixed 3.47 V or adjustable

0.9 V to 8 V

■ 350 mA valley current limit

■ Constant-on-time control

■ Programmable switching frequency

■ Pulse skipping mode (skip mode) at light loads

■ Independent EN signals

■ Latched OVP and UVP

DFN10

switching regulator can be programmed to

regulate a fixed value of 3.47 V or it can deliver an

adjustable voltage, depending on the FB pin set-

up.

Applications

■ Networking power supply

■ Portable applications

■ Microcontroller supply

■ Industrial supply

Description

The PM6644 is a 350 mA valley current limit step-

down regulator capable of delivering an

adjustable output voltage in the range between

0.9 V and 8 V. A fixed value of output voltage is

also available (3.47 V), saving the external

resistor divider. It is housed in a small DFN10 3x3

package. The switching regulator is based on

COT (constant-on-time) architecture, that assures

fast load transient response; the embedded

voltage feed-forward provides nearly constant

switching frequency operation. The pulse skipping

technique increases efficiency at very light load.

The switching frequency can be adjusted from

200 kHz to 600 kHz through a simple resistor. The

Table 1. Device summary

Part number

Package

PM6644

PM6644TR

DFN10

DFN10

Packing

Tube

Tape and reel

June 2012

This is information on a product in full production.

Doc ID 023203 Rev 1

1/35

www.st.com

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