ADP1883ARMZ-1.0-R7 datasheet(1/40 Pages) AD

номер детали	ADP1883ARMZ-1.0-R7

подробное описание детали	Synchronous Current-Mode with Constant On-Time,PWM Buck Controller

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Synchronous Current-Mode with

Constant On-Time, PWM Buck Controller

ADP1882/ADP1883

Rev. 0

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

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother

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 as low as 2.75 V to 20 V

Bias supply voltage range: 2.75 V to 5.5 V

Minimum output voltage: 0.8 V

0.8 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 (ADP1883 only)

Resistor-programmable current-sense gain

Thermal overload protection

Short-circuit protection

Precision enable input

Integrated bootstrap diode for high-side drive

140 μA shutdown supply current

Starts into a precharged load

Small, 10-lead MSOP package

APPLICATIONS

Telecom and networking systems

Mid to high end servers

Set-top boxes

DSP core power supplies

TYPICAL APPLICATIONS CIRCUIT

COMP/EN BST

FB

DRVH

GND

SW

VDD

DRVL

PGND

VIN

CC

CVDD

VDD = 2.75V TO 5.5V

CVDD2

CC2

RC

RBOT

RTOP

VOUT

VIN = 2.75V TO 20V

Q1

Q2

RRES

L

COUT

VOUT

CBST

LOAD

CIN

ADP1882/

ADP1883

Figure 1.

100

95

90

85

80

75

70

65

60

55

50

45

25

30

35

40

100

1k

10k

100k

LOAD CURRENT (mA)

VDD = 5.5V, VIN = 13.0V

VDD = 5.5V, VIN = 16.5V

VDD = 5.5V, VIN = 5.5V (PSM)

VDD = 5.5V, VIN = 5.5V

VDD = 3.6V, VIN = 5.5V

TA = 25°C

VOUT = 1.8V

fSW = 300kHz

WURTH INDUCTOR:

744325120, L = 1.2µH, DCR = 1.8m

Ω

INFINEON MOSFETs:

BSC042N03MS G (UPPER/LOWER)

Figure 2. ADP1882/ADP1883 Efficiency vs. Load Current

(VOUT = 1.8 V, 300 kHz)

GENERAL DESCRIPTION

The ADP1882/ADP1883 are versatile current-mode, synchronous

step-down controllers that 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 valley current-

mode control architecture. This allows the ADP1882/ADP1883

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

as low as 0.8 V.

The ADP1883 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 Power Saving Mode (PSM) Version (ADP1883)

section for more information).

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

1.0 MHz, plus the PSM option), the ADP1882/ADP1883 are

well suited for a wide range of applications. These ICs not only

operate from a 2.75 V to 5.5 V bias supply, but they also can

accept a power input as high as 20 V.

In addition, an internally fixed soft start period is included to limit

input in-rush current from the input supply during startup and

to provide reverse current protection during soft start for a pre-

charged output. 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 ADP1882/ADP1883 operate over the −40°C to +125°C

junction temperature range and are available in a 10-lead MSOP.

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