ADP1871 datasheet(1/44 Pages) AD

Part #	ADP1871

Description	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

ADP1870/ADP1871

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 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 (ADP1871 only)

Resistor-programmable current-sense gain

Thermal overload protection

Short-circuit protection

Precision enable input

Integrated bootstrap diode for high-side drive

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

GENERAL DESCRIPTION

The ADP1870/ADP1871 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 utilizing valley

current-mode control architecture. This allows the ADP1870/

ADP1871 to drive all N-channel power stages to regulate output

voltages as low as 0.6 V.

The ADP1871 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 (ADP1871)

section for more information).

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

1.0 MHz, plus the PSM option), the ADP1870/ADP1871 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 LDO.

TYPICAL APPLICATIONS CIRCUIT

COMP/EN BST

FB

DRVH

GND

SW

VREG

DRVL

PGND

VIN

CC

CVREG

CVREG2

CC2

RC

RBOT

RTOP

VOUT

Q1

Q2

RRES

L

COUT

VOUT

CBST

LOAD

CIN

VIN = 2.95V TO 20V

ADP1870/

ADP1871

Figure 1.

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 = 1.8m

Ω

INFINEON FETs:

BSC042N03MS G (UPPER/LOWER)

VIN = 5V (PSM)

VIN = 13V (PSM)

VIN = 16.5V (PSM)

VIN = 13V

VIN = 16.5V

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

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 ADP1870/ADP1871 operate over the −40°C to +125°C

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

package.

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