MAX829EUK+T Maxim Integrated Products, MAX829EUK+T Datasheet

MAX829EUK+T

Manufacturer Part Number

MAX829EUK+T

Description

IC INVERTER VOLT SOT23-5

Manufacturer

Maxim Integrated Products

Type

Switched Capacitor (Charge Pump), Doubler, Invertingr

Datasheet

1.MAX828EUKT.pdf (8 pages)

Specifications of MAX829EUK+T

Internal Switch(s)

Yes

Synchronous Rectifier

Number Of Outputs

Voltage - Output

-1.15 ~ 6 V, ±2.3 ~ ±12 V

Current - Output

25mA

Frequency - Switching

35kHz

Voltage - Input

1.5 ~ 5.5 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

SOT-23-5, SC-74A, SOT-25

Function

Inverting

Output Voltage

- 1.5 V to - 5.5 V

Output Current

25 mA

Supply Current

150 uA

Maximum Operating Temperature

+ 85 C

Input Voltage

1.5 V to 5.5 V

Maximum Power Dissipation

571 mW

Minimum Operating Temperature

- 40 C

Mounting Style

SMD/SMT

Switching Frequency

35 KHz

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Current page: 1 of 8
Download datasheet (175Kb)

The ultra-small MAX828/MAX829 monolithic, CMOS

charge-pump inverters accept input voltages ranging

from +1.5V to +5.5V. The MAX828 operates at 12kHz,

and the MAX829 operates at 35kHz. Their high efficiency

(greater than 90% over most of the load-current range)

and low operating current (60µA for the MAX828) make

these devices ideal for both battery-powered and board-

level voltage-conversion applications.

The MAX828/MAX829 combine low quiescent current

and high efficiency. Oscillator control circuitry and four

power MOSFET switches are included on-chip.

Applications include generating a -5V supply from a +5V

logic supply to power analog circuitry. Both parts come

in a 5-pin SOT23-5 package and can deliver 25mA with

a voltage drop of 500mV.

For a similar device with logic-controlled shutdown,

refer to the MAX1719/MAX1720/MAX1721. For applica-

tions requiring more power, the MAX860 delivers up to

50mA with a voltage drop of 600mV, in a space-saving

µMAX package.

19-0495; Rev 3; 9/99

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.

NEGATIVE VOLTAGE CONVERTER

Small LCD Panels

Cell Phones

Medical Instruments

Handy-Terminals, PDAs

Battery-Operated Equipment

Typical Operating Circuit

________________________________________________________________ Maxim Integrated Products

C1+

C1-

GND

General Description

Switched-Capacitor Voltage Inverters

MAX828

MAX829

OUT

Applications

INPUT

SUPPLY

VOLTAGE

NEGATIVE

OUTPUT

VOLTAGE

o 5-Pin SOT23-5 Package

o 95% Voltage Conversion Efficiency

o Inverts Input Supply Voltage

o 60µA Quiescent Current (MAX828)

o +1.5V to +5.5V Input Voltage Range

o Requires Only Two Capacitors

o 25mA Output Current

MAX828EUK

MAX829EUK

PART

TOP VIEW

-40°C to +85°C

TEMP. RANGE

OUT

C1-

Ordering Information

SOT23-5

MAX828

MAX829

Pin Configuration

5 SOT23-5

PACKAGE

PIN-

C1+

GND

Features

TOP MARK

AABJ

AABI

SOT

Related parts for MAX829EUK+T

MAX829EUK+T Summary of contents

Page 1

... MAX829 3 C1- 4 GND NEGATIVE VOLTAGE CONVERTER ________________________________________________________________ Maxim Integrated Products 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. o 5-Pin SOT23-5 Package o 95% Voltage Conversion Efficiency o Inverts Input Supply Voltage o 60µA Quiescent Current (MAX828 ...

Page 2

Switched-Capacitor Voltage Inverters ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................+6.0V, -0.3V OUT to GND .............................................................-6.0V, +0.3V OUT Output Current ...........................................................50mA OUT Short-Circuit to GND ............................................Indefinite Continuous Power Dissipation (T = +70°C) A SOT23-5 (derate 7.1mW/°C above +70°C)...................571mW Stresses beyond those ...

Page 3

Switched-Capacitor Voltage Inverters __________________________________________Typical Operating Characteristics (Circuit of Figure +5V C3 OUTPUT RESISTANCE vs. SUPPLY VOLTAGE MAX829 20 MAX828 1.5 2.5 3.5 4.5 ...

Page 4

Switched-Capacitor Voltage Inverters (Circuit of Figure +5V C3 OUTPUT VOLTAGE vs. OUTPUT CURRENT 0.5 -0 2. 3.3V IN -2.5 -3 -4.5 -5.5 0 ...

Page 5

Switched-Capacitor Voltage Inverters _______________Detailed Description The MAX828/MAX829 capacitive charge pumps invert the voltage applied to their input. For highest performance, use low equivalent series resistance (ESR) capacitors. During the first half-cycle, switches S2 and S4 open, switches S1 and S3 ...

Page 6

Switched-Capacitor Voltage Inverters Flying Capacitor (C1) Increasing the flying capacitor’s size reduces the output resistance. Small C1 values increase the output resis- tance. Above a certain point, increasing C1’s capaci- tance has a negligible effect, because the output resistance becomes ...

Page 7

Switched-Capacitor Voltage Inverters … MAX828 MAX829 “1” … C2 Figure 4. Cascading MAX828s or MAX829s to Increase Output Voltage + MAX828 D1 MAX829 ...

Page 8

... 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products ...

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