ADP1874ARQZ-1.0-R7 datasheet(1/44 Pages) AD

номер детали	ADP1874ARQZ-1.0-R7

подробное описание детали	Synchronous Buck Controller with Constant On-Time and Valley Current Mode

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Synchronous Buck Controller with Constant

On-Time and Valley Current Mode

ADP1874/ADP1875

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

FEATURES

Power input voltage range: 2.95 V to 20 V

On-board bias regulator

Minimum output voltage: 0.6 V

0.6 V reference voltage with ±1.0% accuracy

Supports all N-channel MOSFET power stages

Available in 300 kHz, 600 kHz, and 1.0 MHz options

No current-sense resistor required

Power saving mode (PSM) for light loads (ADP1875 only)

Resistor programmable current limit

Power good with internal pull-up resistor

Externally programmable soft start

Thermal overload protection

Short-circuit protection

Standalone precision enable input

Integrated bootstrap diode for high-side drive

Starts into a precharged output

Available in a 16-lead QSOP package

APPLICATIONS

Telecom and networking systems

Mid- to high-end servers

Set-top boxes

DSP core power supplies

GENERAL DESCRIPTION

The ADP1874/ADP1875 are versatile current mode, synchronous

step-down controllers. They provide superior transient response,

optimal stability, and current-limit protection by using a constant

on-time, pseudo fixed frequency with a programmable current

limit, current control scheme. In addition, these devices offer

optimum performance at low duty cycles by using a valley, current

mode control architecture. This allows the ADP1874/ADP1875

to drive all N-channel power stages to regulate output voltages

to as low as 0.6 V.

The ADP1875 is the power saving mode (PSM) version of

the device and is capable of pulse skipping to maintain output

regulation while achieving improved system efficiency at light

loads (see the ADP1875 Power Saving Mode (PSM) section for

more information).

Available in three frequency options (300 kHz, 600 kHz, and

1.0 MHz, plus the PSM option), the ADP1874/ADP1875 are well

suited for a wide range of applications that require a single-input

power supply range from 2.95 V to 20 V. Low voltage biasing is

supplied via a 5 V internal low dropout regulator (LDO).

TYPICAL APPLICATIONS CIRCUIT

COMP

BST

FB

DRVH

GND

SW

VREG

VREG_IN

RES

DRVL

SS

CSS

PGND

VIN

CC

CVREG

CVREG2

CC2

RC

RBOT

RTOP

VOUT

EN

10kΩ

VREG

Q1

Q2

L

COUT

VOUT

CBST

LOAD

CIN

VIN = 2.95V TO 20V

ADP1874/

ADP1875

RRES

RTRK1

PGOOD

RPGD

VEXT

TRACK

RTRK2

VMASTER

Figure 1. Typical Applications Circuit

100

95

90

85

80

75

70

65

60

55

50

45

40

35

30

25

10

100

1k

10k

100k

LOAD CURRENT (mA)

TA = 25°C

VOUT = 1.8V

fSW = 300kHz

WÜRTH INDUCTOR:

744325120, L = 1.2µH, DCR = 1.8mΩ

INFINEON FETs:

BSC042N03MS G (UPPER/LOWER)

VIN = 5V (PSM)

VIN = 13V (PSM)

VIN = 16.5V (PSM)

VIN = 13V

VIN = 16.5V

Figure 2. ADP1874/ADP1875 Efficiency vs. Load Current (VOUT = 1.8 V, 300 kHz)

In addition, soft start programmability is included to limit input in-

rush current from the input supply during startup and to

provide reverse current protection during precharged output

conditions. The low-side current sense, current gain scheme, and

integration of a boost diode, along with the PSM/forced pulse-

width modulation (PWM) option, reduce the external part count

and improve efficiency.

The ADP1874/ADP1875 operate over the −40°C to +125°C

junction temperature range and are available in a 16-lead QSOP

package.

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