PM6675AS datasheet, PDF - EEWORLD Datasheet

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PM6675AS: DescriptionLDO Voltage Controllers DDR 2/3 Memory Pwr Cntrl; CategoryPower/power management The power supply circuit; File Size2MB，48 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/; Environmental Compliance

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PM6675AS Overview

LDO Voltage Controllers DDR 2/3 Memory Pwr Cntrl

PM6675AS Parametric

Parameter Name	Attribute value
Brand Name	STMicroelectronics
Is it Rohs certified?	conform to
Parts packaging code	QFN
package instruction	HVQCCN, LCC24,.16SQ,20
Contacts	24
Manufacturer packaging code	VFQFPN
Reach Compliance Code	unknown
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	VOLTAGE-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	36 V
Minimum input voltage	4.5 V
Nominal input voltage	24 V
JESD-30 code	S-XQCC-N24
JESD-609 code	e3
length	4 mm
Humidity sensitivity level	3
Number of functions	1
Number of terminals	24
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output current	3 A
Package body material	UNSPECIFIED
encapsulated code	HVQCCN
Encapsulate equivalent code	LCC24,.16SQ,20
Package shape	SQUARE
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1 mm
surface mount	YES
Switch configuration	PUSH-PULL
Temperature level	INDUSTRIAL
Terminal surface	Matte Tin (Sn) - annealed
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	NOT SPECIFIED
width	4 mm
Base Number Matches	1

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PM6675AS

High efficiency step-down controller

with embedded 2 A LDO regulator

Features

■

Switching section

– 4.5 V to 36 V input voltage range

– 0.6 V, ±1 % voltage reference

– Selectable 1.5 V fixed output voltage

– Adjustable 0.6 V to 3.3 V output voltage

– 1.237 V ±1 % reference voltage available

– Very fast load transient response using

constant-on-time control loop

– No R

SENSE

current sensing using low side

MOSFETs' R

DS(ON)

– Negative current limit

– Latched OVP and UVP

– Soft-start internally fixed at 3 ms

– Selectable pulse skipping at light load

– Selectable No-audible (33 kHz) pulse skip

mode

– Ceramic output capacitors supported

– Output voltage ripple compensation

– Output soft-end

LDO regulator section

– Adjustable 0.6 V to 3.3 V output voltage

– Selectable ±1 Apk or ±2 Apk current limit

– Dedicated power-good signal

– Ceramic output capacitors supported

– Output soft-end

VFQFPN-24 4x4

Description

The PM6675AS device consists of a single high

efficiency step-down controller and an

independent low drop-out (LDO) linear regulator.

The constant on-time (COT) architecture assures

fast transient response supporting both

electrolytic and ceramic output capacitors. An

embedded integrator control loop compensates

the DC voltage error due to the output ripple.

Selectable low-consumption mode allows the

highest efficiency over a wide range of load

conditions. The low-noise mode sets the minimum

switching frequency to 33 kHz for audio-sensitive

applications. The LDO linear regulator can sink

and source up to 2 Apk. Two fixed current limit

(±1 A- ±2 A) can be chosen.

An active soft-end is independently performed on

both the switching and the linear regulators

outputs when disabled.

■

Applications

■

Industrial application on 24 V

Graphic cards

Embedded computer systems

Table 1.

Device summary

Order codes

PM6675AS

VFQFPN-24 4x4 (exposed pad)

PM6675ASTR

Tape and reel

Package

Packaging

Tube

February 2008

Rev 1

1/48

www.st.com

Contents

PM6675AS

Contents

Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1

2.2

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1

3.2

3.3

Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7.1

Switching section - constant on-time pwm controller . . . . . . . . . . . . . . . . 16

7.1.1

7.1.2

7.1.3

7.1.4

7.1.5

7.1.6

7.1.7

7.1.8

7.1.9

7.1.10

7.1.11

Constant-on-time architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Output ripple compensation and loop stability . . . . . . . . . . . . . . . . . . . . 19

Pulse-skip and no-audible pulse-skip modes . . . . . . . . . . . . . . . . . . . . . 24

Mode-of-operation selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Current sensing and current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

POR, UVLO and soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Switching section power-good signal . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Switching section output discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Gate drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Reference voltage and bandgap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Switching section OV and UV protections . . . . . . . . . . . . . . . . . . . . . . . 30

2/48

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