MAX1856 Maxim, MAX1856 Datasheet

MAX1856

Manufacturer Part Number

MAX1856

Description

Wide Input Range / Synchronizable / PWM SLIC Power Supply

Manufacturer

Maxim

Datasheet

1.MAX1856.pdf (18 pages)

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The MAX1856 offers a low-cost solution for generating a

SLIC (ringer and off-hook) power supply. Using standard

off-the-shelf transformers from multiple vendors, the

MAX1856 generates various output voltages: -24V and

-72V (dual output) for both ringer and off-hook supplies for

voice-enabled broadband consumer premises equipment

(CPE), -48V for IP phones and routers, -5V and -15V (sin-

gle or dual output) for DSL CO line drivers, or negative

voltages as high as -185V for MEMS bias supplies. The

output voltages are adjusted with an external voltage

divider.

Due to its wide operating voltage range, the MAX1856

operates from a low-cost, unregulated DC power supply

for cost-sensitive applications like xDSL, cable modems,

set-top boxes, LMDS, MMDS, WLL, and FTTH CPE. The

MAX1856 provides low audio-band noise for talk battery

and a sturdy output capable of handling the ring trip con-

ditions for ring battery.

The operating frequency can be set between 100kHz and

500kHz with an external resistor in free-running mode. For

noise-sensitive applications, the MAX1856’s operating fre-

quency can be synchronized to an external clock over its

operating frequency range.

The flyback topology allows operation close to 50% duty

cycle, offering high transformer utilization, low ripple cur-

rent, and less stress on input and output capacitors.

Internal soft-start minimizes startup stress on the input

capacitor, without any external components.

The MAX1856’s current-mode control scheme does not

require external loop compensation. The low-side current-

sense resistor provides accurate current-mode control

and overcurrent protection.

19-1898; Rev 0; 2/01

Idle Mode is a trademark of Maxim Integrated Products.

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

VoIP Ringer and Off-Hook Voltage Generators

Cable and DSL Modems

Set-Top Boxes

Wireless Local Loop

FTTH

LMDS/MMDS

Routers

Industrial Power Supplies

CO DSL Line Driver Supplies

MEMS Bias Supplies

________________________________________________________________ Maxim Integrated Products

General Description

Wide Input Range, Synchronizable,

Applications

PWM SLIC Power Supply

o Low-Cost, Off-the-Shelf Transformer

o 3V to 28V Input Range

o Low Audio-Band Noise on Talk Battery

o Effectively Handles Ring Trip Transients

o Powers 2-, 4-, or 12-Line Equipment

o High Efficiency Extends Battery Life During

o Adjustable 100kHz to 500kHz Switching

o Clock Synchronization

o Internal Soft-Start

o Current-Mode PWM and Idle Mode™ Control

o Logic-Level Shutdown

o 10-Pin µMAX Package

INPUT

3V TO 28V

Life-Line Support Conditions

Frequency

Scheme

MAX1856EUB

PART

LDO

SYNC/SHDN

FREQ

GND

PGND

Typical Operating Circuit

MAX1856

TEMP. RANGE

-40°C to +85°C

Ordering Information

EXT

REF

10 µMAX

PIN-PACKAGE

Features

OUT2

OUT1

-72V

-24V

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