MAX1672EEE+ Maxim Integrated Products, MAX1672EEE+ Datasheet

MAX1672EEE+

Manufacturer Part Number

MAX1672EEE+

Description

IC DC/DC CONV STP-UP/DWN 16-QSOP

Manufacturer

Maxim Integrated Products

Type

Step-Down (Buck), Step-Up (Boost)r

Datasheet

1.MAX1672EEE.pdf (11 pages)

Specifications of MAX1672EEE+

Internal Switch(s)

Yes

Synchronous Rectifier

Number Of Outputs

Voltage - Output

3.3V, 5V, Adj

Current - Output

300mA

Voltage - Input

1.8 ~ 11 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

16-QSOP

Power - Output

667mW

Output Voltage

1.25 V to 5.5 V

Output Current

300 mA

Input Voltage

1.8 V to 11 V

Supply Current

85 uA

Mounting Style

SMD/SMT

Maximum Operating Temperature

+ 85 C

Minimum Operating Temperature

- 40 C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Frequency - Switching

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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________________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

Portable Devices

3.3V and Other Low-Voltage

Systems

Digital Cameras

19-1307; Rev 2; 11/02

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

1.8V TO 11V

3.3V

0.5A

INPUT

0.8A

OFF

Typical Operating Circuit

________________________________________________________________ Maxim Integrated Products

PGI

3/5

ILIM

ONA

ONB

REF

PGND

MAX1672

2-Cell to 4-Cell AA Alkaline

Hand-Held Equipment

Battery-Powered Devices

with AC Input Adapters

GND

OUT

PG0

Step-Up/Down DC-DC Converter

LOW-BATTERY

DETECTOR

OUTPUT

3.3V/5V

OUTPUT

*Dice are tested at T

____________________________Features

MAX1672C/D

MAX1672EEE

Step-Up/Down Voltage Conversion

1.8V to 11V Input Range

3.3V/5V or Adjustable Output Voltage Range

Output Current:

Smaller Inductor than SEPIC and Flybacks

Load Disconnects from Input in Shutdown

Supply Current from Battery:

PGI/PGO Low-Battery Comparator

16-Pin QSOP Package

(Same Footprint as 8-pin SO)

No External FETs Required

Thermal and Short-Circuit Protection

TOP VIEW

PART

300mA at 5V (V

150mA at 5V (V

85µA (No-Load)

0.1µA (Shutdown)

in QSOP Package

PGND

ONB

ONA

PGO

ILIM

PGI

3/5

-40°C to +85°C

= +25°C.

TEMP RANGE

0°C to +70°C

Ordering Information

MAX1672

QSOP

2.5V)

1.8V)

Pin Configuration

PIN-PACKAGE

Dice*

16 QSOP

PGND

GND

REF

OUT

Related parts for MAX1672EEE+

MAX1672EEE+ Summary of contents

Page 1

... ILIM REF PGND GND ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Step-Up/Down DC-DC Converter ____________________________Features Step-Up/Down Voltage Conversion 1.8V to 11V Input Range 3.3V/5V or Adjustable Output Voltage Range ...

Page 2

Step-Up/Down DC-DC Converter in QSOP Package ABSOLUTE MAXIMUM RATINGS IN, PS, LX, OUT, PGO to GND ......................... -0.3V to +11.5V ILIM, ONA, ONB, FB, 3/5, REF, PGI to GND......................................-0. PGND to GND .......................................................-0.3V to +0.3V OUT Short Circuit ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 6V 0.1µ 4.7µ REF OUT PARAMETER Thermal Shutdown Threshold Thermal Shutdown Hysteresis PGI/PGO COMPARATOR PGI Input Bias Current V PGI Hysteresis T A PGI Threshold Voltage T A PGO ...

Page 4

Step-Up/Down DC-DC Converter in QSOP Package (T = +25°C, unless otherwise noted.) A MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (V = 5V) OUT 400 MAXIMUM RECOMMENDED OUTPUT CURRENT 300 ILIM = PS (0.8A) 200 ILIM = GND (0.5A) 100 0 ...

Page 5

A OUTPUT RIPPLE (HEAVY LOAD) MAX1672-13 10 s/div (20mV/div, AC COUPLED) OUT B: I (500mA/div 2.7V 250mA OUT ______________________________________________________________Pin Description PIN NAME 1 LX ...

Page 6

Step-Up/Down DC-DC Converter in QSOP Package REF ERROR AMP INPUT MONITOR OUT PS REF ONA REFERENCE GENERATOR REF + OFFSET ONB REF FB 70mV 3/5 PGO REF PGI Figure 1. Functional Diagram 6 _______________________________________________________________________________________ T ON FIXED ...

Page 7

Description The MAX1672 integrates a step-up, switch-mode DC- DC converter with a linear regulator to provide step- up/down voltage conversion. The step-up converter contains an N-channel power MOSFET switch, while the linear regulator contains a P-channel MOSFET pass element ...

Page 8

Step-Up/Down DC-DC Converter in QSOP Package __________________Design Procedure Output Voltage Selection For fixed output voltages of 3.3V or 5V, connect 3 GND and connect FB to GND (Table 2). Alternatively, adjust the output voltage from 1.25V to ...

Page 9

Table 3. Suggested Inductor Values ILIM 3/5 0 (5V) 0 (0.5A) 0 (5V) 1 (0.8A) 1 (3.3V) 0 (0.5A) 1 (3.3V) 1 (0.8A) Capacitor Selection The equivalent series resistance (ESR) of both bypass and filter capacitors affects efficiency and output ...

Page 10

Step-Up/Down DC-DC Converter in QSOP Package __________Applications Information Using a Single, Pushbutton On/Off Switch A single pushbutton switch can be used to turn the MAX1672 on and off. As shown in Figure 3, ONA is pulled low and ONB is ...

Page 11

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2002 Maxim Integrated Products ...

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