Rainbow-electronics MAX1802 Uživatelský manuál stáhnout pdf

General Description

The MAX1802 provides a complete power-supply solu-

tion for digital still cameras and video cameras by inte-

grating two high-efficiency step-down DC-DC converters

and three auxiliary step-up controllers. This complete

solution is targeted for applications that use either three

to four alkaline cells or two lithium-ion (Li+) cells.

The main step-down DC-DC controller accepts inputs

from 2.5V to 11V and regulates a resistor-adjustable out-

put from 2.7V to 5.5V. It uses a synchronous rectifier to

regulate the output with up to 94% efficiency. An

adjustable operating frequency (up to 1MHz) facilitates

designs for optimum size, cost, and efficiency.

The core step-down DC-DC converter accepts inputs

from 2.7V to 5.5V and regulates a resistor-adjustable

output from 1.25V to 5.5V. It delivers 500mA with up to

94% efficiency.

The three auxiliary step-up controllers can be used to

power the digital camera’s CCD, LCD, and backlight.

The MAX1802 also features expandability by supplying

power, an oscillator signal, and a reference to the

MAX1801, a low-cost slave DC-DC controller that sup-

ports step-up, single-ended primary inductance con-

verter (SEPIC), and fly-back configurations.

The MAX1802 is available in a space-saving 32-pin

TQFP package (5mm x 5mm body), and the MAX1801

is available in an 8-pin SOT-23 package. An evaluation

kit (MAX1802EVKIT) featuring both devices is available

to expedite designs.

________________________Applications

Digital Still Cameras

Digital Video Cameras

Hand-Held Devices

Internet Access Tablets

PDAs

DVD Players

Features

♦ 2.5V to 11V Input Voltage Range

♦ Main DC-DC Controller

94% Efficiency

+2.7V to +5.5V Adjustable Output Voltage

Up to 100% Duty Cycle

Independent Shutdown

♦ Core DC-DC Converter

94% Efficiency

Up to 500mA Load Efficiency

Output Voltage Adjustable Down to 1.25V

Independent Shutdown

♦ Three Auxiliary DC-DC Controllers

Adjustable Maximum Duty Cycle

Independent Shutdown

♦ Power, Oscillator, and Reference Outputs to Drive

External Slave Controllers (MAX1801)

♦ Up to 1MHz Switching Frequency

♦ 3µA Supply Current in Shutdown Mode

♦ Internal Soft-Start

♦ Overload Protection for All DC-DC Converters

♦ Compact 32-Pin TQFP Package

MAX1802

Digital Camera Step-Down

Power Supply

________________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuit

19-1850; Rev 0; 10/00

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.

Ordering Information

Note: Refer to the separate data sheet for MAX1801EKA in an 8-

pin SOT.

Pin Configuration appears at end of data sheet.

32 TQFP

PIN-PACKAGETEMP. RANGE

-40°C to +85°CMAX1802EHJ

PART

MAX1802

MASTER

MAX1801

SLAVE

INPUT

2.5V TO 11V

OSC POWER REF

MOTOR

CORE

MAIN

CCD

CCFL

TFT

1 2 3 4 5 6 ... 27 28

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Strany 1 - Power Supply

General DescriptionThe MAX1802 provides a complete power-supply solu-tion for digital still cameras and video cameras by inte-grating two high-efficie

Strany 2

1.2471.2491.2481.2511.2501.2521.2530 10050 150 200 250MAX1802 toc10REFERENCE CURRENT (µA)REFERENCE VOLTAGE (V)REFERENCE VOLTAGEvs. REFERENCE CURRENT02

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MAX1802Digital Camera Step-DownPower Supply______________________________________________________________________________________ 11Typical Operating

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MAX1802Digital Camera Step-DownPower Supply12 ______________________________________________________________________________________Pin Description PI

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MAX1802Digital Camera Step-DownPower Supply______________________________________________________________________________________ 13 PIN NAME FUNCTI

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MAX1802Digital Camera Step-DownPower Supply14 ______________________________________________________________________________________Detailed Descripti

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MAX1802Digital Camera Step-DownPower Supply______________________________________________________________________________________ 15OSC45VLVLREFREFOSC

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MAX1802Digital Camera Step-DownPower Supply16 ______________________________________________________________________________________Core DC-DC Convert

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MAX1802Digital Camera Step-DownPower Supply______________________________________________________________________________________ 17trollers regulate

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MAX1802Digital Camera Step-DownPower Supply18 ______________________________________________________________________________________age lockout thresh

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MAX1802Digital Camera Step-DownPower Supply______________________________________________________________________________________ 19ROSC= (200ns - 1/f

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MAX1802Digital Camera Step-DownPower Supply2 _______________________________________________________________________________________ABSOLUTE MAXIMUM R

Strany 13

MAX1802Digital Camera Step-DownPower Supply20 ______________________________________________________________________________________Use discontinuous

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MAX1802Digital Camera Step-DownPower Supply______________________________________________________________________________________ 21the N-channel turn

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MAX1802Digital Camera Step-DownPower Supply22 ______________________________________________________________________________________and the output vol

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MAX1802Digital Camera Step-DownPower Supply______________________________________________________________________________________ 23To achieve a stabl

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MAX1802Digital Camera Step-DownPower Supply24 ______________________________________________________________________________________3) Place the compe

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MAX1802Digital Camera Step-DownPower Supply______________________________________________________________________________________ 25The frequency (in

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MAX1802Digital Camera Step-DownPower Supply26 ______________________________________________________________________________________converter is the S

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MAX1802Digital Camera Step-DownPower Supply______________________________________________________________________________________ 27RCGCMAX1802+ OUTPU

Strany 21

MAX1802Digital Camera Step-DownPower SupplyMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Max

Strany 22

MAX1802Digital Camera Step-DownPower Supply_______________________________________________________________________________________ 3ELECTRICAL CHARACT

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MAX1802Digital Camera Step-DownPower Supply4 _______________________________________________________________________________________PARAMETER SYMBOL C

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MAX1802Digital Camera Step-DownPower Supply_______________________________________________________________________________________ 5PARAMETER SYMBOL C

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MAX1802Digital Camera Step-DownPower Supply6 _______________________________________________________________________________________ELECTRICAL CHARACT

Strany 26

MAX1802Digital Camera Step-DownPower Supply_______________________________________________________________________________________ 7ELECTRICAL CHARACT

Strany 27

MAX1802Digital Camera Step-DownPower Supply8 _______________________________________________________________________________________ PA

Strany 28

MAX1802Digital Camera Step-DownPower Supply_______________________________________________________________________________________ 910001 10 100 1000E

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Rainbow-electronics MAX1802 Uživatelský manuál

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