MAX1523EUT+T Maxim Integrated Products, MAX1523EUT+T Datasheet

MAX1523EUT+T

Manufacturer Part Number

MAX1523EUT+T

Description

IC SIMPLE BOOST CNTRLR SOT23-6

Manufacturer

Maxim Integrated Products

Type

Step-Up (Boost), Flyback, Sepicr

Datasheet

1.MAX1524EUT-T.pdf (14 pages)

Specifications of MAX1523EUT+T

Internal Switch(s)

Synchronous Rectifier

Number Of Outputs

Voltage - Output

2.5 ~ 100 V

Frequency - Switching

1MHz

Voltage - Input

2.5 ~ 5.5 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

SOT-23-6

Power - Output

696mW

Output Voltage

2.5 V to 100 V

Output Current

0.95 A

Input Voltage

2.5 V to 5.5 V

Supply Current

25 uA

Mounting Style

SMD/SMT

Maximum Operating Temperature

+ 85 C

Minimum Operating Temperature

- 40 C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current - Output

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Current page: 1 of 14
Download datasheet (437Kb)

The MAX1522/MAX1523/MAX1524 are simple, compact

boost controllers designed for a wide range of DC-DC

conversion topologies, including step-up, SEPIC, and

flyback applications. They are for applications where

extremely low cost and small size are top priorities.

These devices are designed specifically to provide a

simple application circuit and minimize the size and

number of external components, making them ideal for

PDAs, digital cameras, and other low-cost consumer

electronics applications.

These devices use a unique fixed on-time, minimum off-

time architecture, which provides excellent efficiency

over a wide-range of input/output voltage combinations

and load currents. The fixed on-time is pin selectable to

either 0.5µs (50% max duty cycle) or 3µs (85% max

duty cycle), permitting optimization of external compo-

nent size and ease of design for a wide range of output

voltages.

The MAX1522/MAX1523 operate from a +2.5V to +5.5V

input voltage range and are capable of generating a

wide range of outputs. The MAX1524 is intended for

bootstrapped operation, permitting startup with lower

input voltage. All devices have internal soft-start and

short-circuit protection to prevent excessive switching

current during startup and under output fault condi-

tions. The MAX1522/MAX1524 have a latched fault

mode, which shuts down the controller when a short-

circuit event occurs, whereas the MAX1523 reenters

soft-start mode during output fault conditions. The

MAX1522/MAX1523/MAX1524 are available in a space-

saving 6-pin SOT23 package.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

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

________________________Applications

19-1926; Rev 1; 8/10

Low-Cost, High-Current,

or High-Voltage Boost

Conversion

LCD Bias Supplies

Industrial +24V and +28V

Power Supplies

TOP VIEW

GND

SET

________________________________________________________________ Maxim Integrated Products

General Description

MAX1522

MAX1523

MAX1524

SOT23

Pin Configuration

Low-Cost, Multi-Output

Flyback Converters

SEPIC Converters

Low-Cost Battery-

Powered Applications

EXT

SHDN

Simple SOT23 Boost Controllers

o Simple, Flexible Application Circuit

o 2-Cell NiMH or Alkaline Operation (MAX1524)

o Low Quiescent Current (25µA typ)

o Output Fault Protection and Soft-Start

o High Efficiency Over 1000:1 I

o Pin-Selectable Maximum Duty Factor

o Micropower Shutdown Mode

o Small 6-Pin SOT23 Package

o No Current-Sense Resistor

____________________________Features

+ Denotes a lead(Pb)-free/RoHS-compliant package.

- Denotes a package containing lead(Pb).

T = Tape and reel.

MAX1522EUT+T

MAX1523EUT+T

MAX1524EUT+T

__________Typical Operating Circuit

MAX1522EUT-T

MAX1523EUT-T

MAX1524EUT-T

50% 85%

OFF ON

PART

INPUT

SET

SHDN

TEMP. RANGE

-40°C to +85°C

MAX1522

MAX1523

MAX1524

Ordering Information

GND

EXT

OUT

PIN-

PACKAGE

6 SOT23

Range

+AAOX

+AAOY

+AAOZ

OUTPUT

MARK

AAOX

AAOY

AAOZ

TOP

Related parts for MAX1523EUT+T

MAX1523EUT+T Summary of contents

Page 1

... Output Fault Protection and Soft-Start o High Efficiency Over 1000 Pin-Selectable Maximum Duty Factor o Micropower Shutdown Mode o Small 6-Pin SOT23 Package o No Current-Sense Resistor PART MAX1522EUT-T MAX1523EUT-T MAX1524EUT-T MAX1522EUT+T MAX1523EUT+T MAX1524EUT+T + Denotes a lead(Pb)-free/RoHS-compliant package. - Denotes a package containing lead(Pb Tape and reel. __________Typical Operating Circuit 50% 85% ...

Page 2

Simple SOT23 Boost Controllers ABSOLUTE MAXIMUM RATINGS , FB, SHDN, SET to GND ...................................-0. EXT to GND ................................................-0. Continuous Power Dissipation (T = +70°C) A 6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........696mW Operating Temperature ...

Page 3

A EFFICIENCY vs. LOAD CURRENT (DESIGN EXAMPLE 1) 100 +5V OUT 100 1000 LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT ...

Page 4

Simple SOT23 Boost Controllers (T = +25°C, unless otherwise noted.) A SOFT-START RESPONSE 200Ω RESISTIVE LOAD 5V/div OUT 5V/div SHDN 1A/div L LINE-TRANSIENT RESPONSE A ...

Page 5

PIN NAME 1 GND Ground 2 FB Feedback Input. Connect FB to external resistive voltage-divider. FB regulates to 1.25V. On-Time Control. Connect SET SET GND to set the fixed 0.5µs on-time (50% duty cycle). See On-Time SET ...

Page 6

Simple SOT23 Boost Controllers guarantees startup with input voltages down to 1. The startup oscillator has a fixed 25% duty cycle CC and will toggle the MOSFET gate and begin boosting the output voltage. Once the output ...

Page 7

The selection of 30% ripple current causes this to happen at loads less than approximately 1/6th of maximum load. There are two common reasons not to run in CCM: 1) High output voltage. In this case, the ...

Page 8

Simple SOT23 Boost Controllers INPUT 3.3V ±10% R3 10Ω C3 0.1µF OFF ON Figure 2. MAX1524 Standard Operating Circuit For CCM, the ideal inductor value is given by: × TYP ( ) ON TYP = L IDEAL ...

Page 9

C typically needed. Output ripple due to ESR is: ≅ × RIPPLE ESR ( ) PEAK at light and medium loads, and three times as great at ...

Page 10

Simple SOT23 Boost Controllers Optional Feed-Forward Capacitor Selection For proper control of peak inductor current during soft- start and for stable switching, the ripple at FB should be greater than 25mV. Without a feed-forward capaci- tor connected between the output ...

Page 11

The MAX1522/MAX1523/MAX1524s’ high switching fre- quency demands a high-speed rectifier. Schottky diodes are recommended for most applications because of their fast recovery time and low forward voltage. Ensure that the diode’s current rating is ade- quate to withstand the diode’s ...

Page 12

Simple SOT23 Boost Controllers Table 1. Design Examples Using CCM PARAMETER 3.3V ±10 OUT I 700mA OUT(MAX) 274kΩ, 90.9kΩ R1, R2 Duty Cycle (max) 45.5% t 0.5µs (SET = GND) ON 691kHz to 909kHz f SWITCHING ...

Page 13

Table 2. Design Examples Using DCM PARAMETER EXAMPLE 4 V 2. 24V OUT I 30mA OUT(MAX) R1, R2 909kΩ, 49.9kΩ Duty Cycle (max) 89.0% 3µ (SET = 11.9µH IDEAL Sumida ...

Page 14

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products ...

Related keywords

max1595
max152
max1556
max1523eut
max1523
max1522eut
max1522
max1510
max15053
max15041
max15038
MAX1523EUT+T datasheet
MAX1523EUT+T data sheet
MAX1523EUT+T pdf datasheet
MAX1523EUT+T component
MAX1523EUT+T part
MAX1523EUT+T distributor
MAX1523EUT+T RoHS
MAX1523EUT+T datasheet download