Rainbow-electronics MAX1800 Bedienungsanleitung PDF herunterladen (Seite 1)

General Description

The MAX1800 provides a complete power-supply solu-

tion for digital still cameras and video cameras. The

device integrates a high-efficiency main step-up DC-DC

converter, three auxiliary step-up controllers, and an

uncommitted gain block that drives an external P-channel

MOSFET for a linear regulator. The MAX1800 is targeted

for applications that use either two or three primary cells

or a single lithium-ion (Li+) battery.

The main DC-DC converter accepts inputs from +0.7V to

+5.5V and regulates a resistor-adjustable output from

2.7V to 5.5V. It uses an internal synchronous rectifier to

regulate the output with 95% efficiency. An adjustable

operating frequency facilitates designs for optimum size,

cost, and efficiency.

The auxiliary step-up controllers can be used to power a

digital camera’s CCD, LCD, and backlight. The MAX1800

also features expandability by supplying power, oscillator

signal, and reference to the MAX1801, a low-cost slave

DC-DC controller that supports step-up, SEPIC, and fly-

back configurations.

The MAX1800 is available in a space-saving 32-pin TQFP

package (5mm x 5mm body), and the MAX1801 is avail-

able in an 8-pin SOT package. An evaluation kit

(MAX1800EVKIT) featuring both devices is available to

expedite designs.

________________________Applications

Digital Still Cameras PDAs

Digital Video Cameras DVD Players

Hand-Held Devices

Internet Access Tablets

Features

♦ +0.7V to +5.5V Input Voltage Range

♦ Main DC-DC Converter

95% Efficiency

+2.7V to +5.5V Adjustable Output Voltage

1.5A Load Current

♦ Uncommitted Gain Block for Linear Regulator

♦ Three Independent Auxiliary Step-Up Controllers

Adjustable Maximum Duty Cycle

♦ Oscillator and Reference Outputs to Drive External

Slave Controllers (MAX1801)

♦ Power-Ready Output

♦ Up to 1MHz Switching Frequency

♦ 1µA Supply Current in Shutdown Mode

♦ Internal Soft-Start Control

♦ Overload Protection for all DC-DC Converters

♦ Compact 32-Pin TQFP Package (5mm x 5mm body)

MAX1800

Digital Camera Step-Up

Power Supply

________________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuit

19-1833; 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.

EVALUATION KIT

AVAILABLE

Ordering Information

MAX1800

MASTER

MAX1801

SLAVE

INPUT

0.7V TO 5.5V

OSC REF

MOTOR

TFT

CCD

CCFL

CORE

MAIN

MAX1800

TQFP

TOP VIEW

32 28

293031

ON3

FB3

COMP3

DCON3

DL3

ONA

1611 12

ON2

COMP2

FB2

OUT

DCON2

GND

REF

OSC

RDYM

24 ONM

POUT

PGND

COMPM

FBM

8DL2

POUT

DCON1

COMP1

FB1

ON1

DL1

1PGND

Pin Configuration

PART TEMP. RANGE

PIN-PACKAGE

MAX1800EHJ -40°C to +85°C 32 TQFP

1 2 3 4 5 6 ... 23 24

Digital Camera Step-Up 1
Power Supply 1

Inhaltsverzeichnis

Seite 1 - Power Supply

General DescriptionThe MAX1800 provides a complete power-supply solu-tion for digital still cameras and video cameras. Thedevice integrates a high-eff

Seite 2

MAX1800Digital Camera Step-UpPower Supply10 ______________________________________________________________________________________CC2+5VINPUT0.7V TO 5

Seite 3

MAX1800Digital Camera Step-UpPower Supply______________________________________________________________________________________ 11the output voltage.

Seite 4

MAX1800Digital Camera Step-UpPower Supply12 ______________________________________________________________________________________Analog Gain BlockThe

Seite 5

MAX1800Digital Camera Step-UpPower Supply______________________________________________________________________________________ 13heavy loads (see the

Seite 6

MAX1800Digital Camera Step-UpPower Supply14 ______________________________________________________________________________________Setting the Output V

Seite 7

MAX1800Digital Camera Step-UpPower Supply______________________________________________________________________________________ 15input source so that

Seite 8

MAX1800Digital Camera Step-UpPower Supply16 ______________________________________________________________________________________To determine the com

Seite 9

MAX1800Digital Camera Step-UpPower Supply______________________________________________________________________________________ 17Auxiliary Controller

Seite 10

MAX1800Digital Camera Step-UpPower Supply18 ______________________________________________________________________________________4) Place the compens

Seite 11

MAX1800Digital Camera Step-UpPower Supply______________________________________________________________________________________ 19The Bode plot of the

Seite 12

MAX1800Digital Camera Step-UpPower Supply2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RAT

Seite 13

MAX1800Digital Camera Step-UpPower Supply20 ______________________________________________________________________________________Applications Informa

Seite 14

Choose the MOSFET for low dropout. The maximumacceptable on-resistance of the MOSFET is determinedby the maximum load current to achieve the requiredd

Seite 15

MAX1800up/step-down DC/DC converter. One way of makingsuch a circuit is to add a low-dropout linear regulatorafter a step-up converter. When the batte

Seite 16

MAX1800Digital Camera Step-UpPower Supply______________________________________________________________________________________ 23Package Information3

Seite 17

MAX1800Digital Camera Step-UpPower SupplyMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim

Seite 18

MAX1800Digital Camera Step-UpPower Supply_______________________________________________________________________________________ 3ELECTRICAL CHARACTER

Seite 19

MAX1800Digital Camera Step-UpPower Supply4 _______________________________________________________________________________________ELECTRICAL CHARACTER

Seite 20

MAX1800Digital Camera Step-UpPower Supply_______________________________________________________________________________________ 5Typical Operating Ch

Seite 21

MAX1800Digital Camera Step-UpPower Supply6 _______________________________________________________________________________________Typical Operating Ch

Seite 22

MAX1800Digital Camera Step-UpPower Supply_______________________________________________________________________________________ 7Typical Operating Ch

Seite 23

MAX1800Digital Camera Step-UpPower Supply8 _______________________________________________________________________________________Pin Description PIN

Seite 24

MAX1800Digital Camera Step-UpPower Supply_______________________________________________________________________________________ 9Detailed Description

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Inhaltsverzeichnis

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Rainbow-electronics MAX1800 Bedienungsanleitung Seite 1

Stöbern Sie online oder laden Sie Bedienungsanleitung nach Sensoren Rainbow-electronics MAX1800 herunter. Rainbow Electronics MAX1800 User Manual Benutzerhandbuch

Inhaltsverzeichnis

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