Rainbow-electronics MAX1672 Manual de usuario descargar pdf

________________General Description

The MAX1672 integrates a step-up DC-DC converter with a

linear regulator to provide step-up/down voltage conver-

sion. This device provides a constant output voltage for

inputs that vary above and below the output voltage. It has

a 1.8V to 11V input range and a preset 3.3V or 5V output.

The output can also be set from 1.25V to 5.5V using two

resistors. Typical efficiency is 85%.

The MAX1672’s step-up/linear-regulator configuration per-

mits the use of a single, physically smaller inductor than

can be used with competing SEPIC and flyback configura-

tions. Switch current is also selectable, permitting the use

of smaller inductors in low-current applications. The linear

regulator also acts as a filter to reduce output ripple voltage.

The MAX1672 has a low 85µA quiescent supply current, which

is further reduced to 0.1µA in logic-controlled shutdown. The

output voltage is disconnected from the input in shutdown.

The MAX1672 also has a PGI/PGO low-battery detector.

The MAX1672 comes in a 16-pin QSOP package (same size

as a standard 8-pin SO). For a larger device that delivers more

output current, refer to the MAX710/MAX711. The preassem-

bled MAX1672 evaluation kit is available to speed designs.

________________________Applications

Single-Cell, Lithium-Powered 2-Cell to 4-Cell AA Alkaline

Portable Devices Hand-Held Equipment

3.3V and Other Low-Voltage Battery-Powered Devices

Systems with AC Input Adapters

Digital Cameras

____________________________Features

♦ Step-Up/Down Voltage Conversion

♦ 1.8V to 11V Input Range

♦ 3.3V/5V or Adjustable Output Voltage Range

♦ Output Current:

300mA at 5V (V

≥ 2.5V)

150mA at 5V (V

≥ 1.8V)

♦ Smaller Inductor than SEPIC and Flybacks

♦ Load Disconnects from Input in Shutdown

♦ Supply Current from Battery:

85µA (No-Load)

0.1µA (Shutdown)

♦ PGI/PGO Low-Battery Comparator

♦ 16-Pin QSOP Package

(same footprint as 8-pin SO)

♦ No External FETs Required

♦ Thermal and Short-Circuit Protection

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

MAX1672

Step-Up/Down DC-DC Converter

in QSOP Package

________________________________________________________________

Maxim Integrated Products

19-1307; Rev 0a; 11/97

EVALUATION KIT

AVAILABLE

______________Ordering Information

Dice are tested at T

= +25°C.

LX LX

PGND

GND

REF

OUT

TOP VIEW

MAX1672

QSOP

PGND

ONA

ILIM

PGO

PGI

3/5

ONB

__________________Pin Configuration

MAX1672

ONA

PGI

ONB

OFF

PGND GND

3.3V/5V

OUTPUT

INPUT

1.8V TO 11V

LOW-BATTERY

DETECTOR

OUTPUT

OUT

PG0

REF

OFF

3/5

ILIM

0.8A

3.3V

0.5A

__________Typical Operating Circuit

PART

MAX1672C/D

MAX1672EEE -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

Dice*

16 QSOP

1 2 3 4 5 6 ... 11 12

Step-Up/Down DC-DC Converter 1

Indice de contenidos

Pagina 1 - Step-Up/Down DC-DC Converter

________________General DescriptionThe MAX1672 integrates a step-up DC-DC converter with alinear regulator to provide step-up/down voltage conver-sion

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MAX1672Step-Up/Down DC-DC Converter in QSOP Package12 ______________________________________________________________________________________NOTES

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MAX1672Step-Up/Down DC-DC Converter in QSOP Package2 _______________________________________________________________________________________ABSOLUTE M

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MAX1672Step-Up/Down DC-DC Converterin QSOP Package_______________________________________________________________________________________ 3ELECTRICAL

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MAX1672Step-Up/Down DC-DC Converterin QSOP Package_______________________________________________________________________________________ 5___________

Pagina 9

MAX1672Step-Up/Down DC-DC Converter in QSOP Package6 _______________________________________________________________________________________NLXILIMPGN

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Pagina 12

MAX1672Step-Up/Down DC-DC Converterin QSOP Package_______________________________________________________________________________________ 9Capacitor S

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Rainbow-electronics MAX1672 Manual de usuario

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