MAX1965TEEP Maxim Integrated, MAX1965TEEP Datasheet

MAX1965TEEP

Manufacturer Part Number

MAX1965TEEP

Description

Current & Power Monitors & Regulators

Manufacturer

Maxim Integrated

Datasheet

1.MAX1965TEEP.pdf (30 pages)

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19-2084; Rev 0; 7/01

The MAX1964/MAX1965 power-supply controllers are

designed to address cost-sensitive applications

demanding voltage sequencing/tracking, such as

cable modem consumer premise equipment (CPE),

xDSL CPE, and set-top boxes. Operating off a low-cost,

unregulated DC supply (such as a wall adapter output),

the MAX1964 generates three positive outputs and the

MAX1965 generates four positive outputs and one neg-

ative output to provide an inexpensive system power

supply.

The MAX1964 includes a current-mode synchronous

step-down controller and two positive regulator gain

blocks. The MAX1965 has one additional positive gain

block and one negative regulator gain block. The main

synchronous step-down controller generates a high-

current output that is preset to 3.3V or adjustable from

1.236V to 0.75

The 200kHz operating frequency allows the use of low-

cost aluminum-electrolytic capacitors and low-cost

power magnetics. Additionally, the MAX1964/MAX1965

step-down controllers sense the voltage across the low-

side MOSFET’s on-resistance to efficiently provide the

current-limit signal, eliminating the need for costly cur-

rent-sense resistors.

The MAX1964/MAX1965 generate additional supply

rails at low cost. The positive regulator gain blocks use

an external PNP pass transistor to generate low voltage

rails directly from the main step-down converter (such

as 2.5V or 1.8V from the main 3.3V output) or higher

voltages using coupled windings from the step-down

converter (such as 5V, 12V, or 15V). The MAX1965’s

negative gain block uses an external NPN pass transis-

tor in conjunction with a coupled winding to generate

-5V, -12V, or -15V.

All output voltages are externally adjustable, providing

maximum flexibility. During startup, the MAX1964 fea-

tures voltage sequencing and the MAX1965 features

voltage tracking. Both controllers provide a power-

good output that monitors all of the output voltages.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Typical Operating Circuit appears at end of data sheet.

xDSL, Cable, and ISDN Modems

Set-Top Boxes

Wireless Local Loop

________________________________________________________________ Maxim Integrated Products

with an external resistive-divider.

General Description

Tracking/Sequencing Triple/Quintuple

Applications

Power-Supply Controllers

o 4.5V to 28V Input Voltage Range

o Master DC-DC Step-Down Converter:

o Two (MAX1964)/Four (MAX1965) Analog Gain

o Power-Good Indicator

o Voltage Sequencing (MAX1964) or Tracking

MAX1964TEEE

MAX1965TEEP

TOP VIEW

COMP

Blocks:

(MAX1965)

POK

OUT

FB2

FB3

Preset 3.3V or Adjustable (1.236V to 0.75 x V

Output Voltage

Fixed Frequency (200kHz) PWM Controller

No Current-Sense Resistor

Adjustable Current Limit

95% Efficient

Soft-Start

Positive Analog Blocks Drive Low-Cost PNP

Pass Transistors to Build Positive Linear

Regulators

Negative Analog Block (MAX1965) Drives a

Low-Cost NPN Pass Transistor to Build a

Negative Linear Regulator

PA RT

16-Pin QSOP

MAX1964

-40°C to +85°C

RANGE

TEMP.

Ordering Information

BST

GND

ILIM

Pin Configurations

COMP

POK

OUT

FB2

FB3

FB4

PIN-

PACKAGE

16 QSOP

20 QSOP

20-Pin QSOP

MAX1965

Features

(kHz)

200

OSC

BST

GND

ILIM

FB5

)

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