Rainbow-electronics MAX1801 User Manual download pdf

General Description

The MAX1801 step-up slave DC-DC controller is used

with either the MAX1800 (step-up) or the MAX1802 (step-

down) master DC-DC converter to provide a complete

power-supply solution for digital still and digital video

cameras. By using the master converter’s reference volt-

age and oscillator, the size and the cost of the slave con-

troller are reduced and all converters are guaranteed to

switch at the same frequency.

The MAX1801 drives an external N-channel MOSFET

and can be used in step-up, single-ended primary

inductance converter (SEPIC), and flyback topologies. If

extra supplies are required for a new design, slave con-

trollers can be added to an existing master circuit with

minimal redesign, saving both cost and time. The

MAX1801 features a built-in soft-start, short-circuit pro-

tection, and an adjustable duty-cycle limit.

The MAX1801 is available in a space-saving 8-pin

SOT23 package. Separate evaluation kits combining the

MAX1800/MAX1801 (MAX1800EVKIT) and MAX1802/

MAX1801 (MAX1802EVKIT) are available to expedite

designs.

________________________Applications

Features

♦ Provides Simple Expandability for the MAX1800

and MAX1802 Master Converters

♦ Operates in Step-Up, SEPIC, and Flyback

Topologies

♦ 100kHz to 1MHz Adjustable Operating Frequency

♦ Duty-Cycle Limit Adjustable from 40% to 90%

♦ Soft-Start

♦ Short-Circuit Protection

♦ 0.01µA Supply Current in Shutdown Mode

♦ Tiny 8-Pin SOT23 Package

MAX1801

Digital Camera Step-Up Slave

DC-DC Controller

________________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuit

19-1741 Rev 0; 10/00

Ordering Information

Pin Configuration appears at end of data sheet.

8 SOT23-8

PIN-PACKAGETEMP. RANGE

-40°C to +85°CMAX1801EKA-T

PART

MAX1801

COMP

GND

REF

1.25V

2.2V TO 5.5V

OSC

DCON

BATTERY

0.7V TO V

OUT

MAX1800

MAX1802

Digital Still Cameras

Digital Video Cameras

Portable DVD Players

Internet Access Tablets

PDAs

Hand-Held Devices

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.

1 2 3 4 5 6 ... 15 16

Summary of Contents

Page 1 - DC-DC Controller

General DescriptionThe MAX1801 step-up slave DC-DC controller is usedwith either the MAX1800 (step-up) or the MAX1802 (step-down) master DC-DC convert

Page 2

MAX1801Digital Camera Step-Up SlaveDC-DC Controller10 ______________________________________________________________________________________Inductor S

Page 3

MAX1801Digital Camera Step-Up SlaveDC-DC Controller______________________________________________________________________________________ 11Since the

Page 4

MAX1801Digital Camera Step-Up SlaveDC-DC Controller12 ______________________________________________________________________________________1) Choose

Page 5

MAX1801Digital Camera Step-Up SlaveDC-DC Controller______________________________________________________________________________________ 13To configu

Page 6

MAX1801Digital Camera Step-Up SlaveDC-DC Controller14 ______________________________________________________________________________________Using the

Page 7

MAX1801Digital Camera Step-Up SlaveDC-DC Controller______________________________________________________________________________________ 15FBCOMPDCON

Page 8

MAX1801Digital Camera Step-Up SlaveDC-DC ControllerMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied

Page 9

MAX1801Digital Camera Step-Up SlaveDC-DC Controller2 _______________________________________________________________________________________ABSOLUTE M

Page 10

MAX1801Digital Camera Step-Up SlaveDC-DC Controller_______________________________________________________________________________________ 3ELECTRICAL

Page 11

MAX1801Digital Camera Step-Up SlaveDC-DC Controller4 _______________________________________________________________________________________PARAMETER

Page 12

MAX1801Digital Camera Step-Up SlaveDC-DC Controller_______________________________________________________________________________________ 50206040801

Page 13

MAX1801Digital Camera Step-Up SlaveDC-DC Controller6 _______________________________________________________________________________________Pin Descri

Page 14

MAX1801Digital Camera Step-Up SlaveDC-DC Controller_______________________________________________________________________________________ 7MAX1801DLF

Page 15

MAX1801Digital Camera Step-Up SlaveDC-DC Controller8 _______________________________________________________________________________________Oscillator

Page 16

MAX1801Digital Camera Step-Up SlaveDC-DC Controller_______________________________________________________________________________________ 9ShutdownSe

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Rainbow-electronics MAX1801 User Manual

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Summary of Contents

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