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MAX1672

Step-Up/Down DC-DC Converter in QSOP Package

Compact, Low-Noise, Transformerless Step-Up/Down Regulator with Single Small Inductor Has Low Output Ripple

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Overview

Description

The MAX1672 integrates a step-up DC-DC converter with a linear regulator to provide step-up/down voltage conversion. 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 permits the use of a single, physically smaller inductor than can be used with competing SEPIC and flyback configurations. 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-bar 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 preassembled MAX1672 evaluation kit is available to speed designs.

MAX1672: Typical Operating Circuit

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Key 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_IN > 2.5V)
- 150mA at 5V (V_IN > 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-bar Low-Battery Comparator
16-Pin QSOP Package (Same Footprint as 8-pin SO)
No External FETs Required
Thermal and Short-Circuit Protection

Applications/Uses

2-Cell to 4-Cell AA Alkaline Handheld Equipment
3.3V and Other Low-Voltage Systems
Battery-Powered Devices
Digital Cameras
Single-Cell, Lithium-Powered Portable Devices with AC Input Adapters

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Preset V_OUT
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Power Good Signal

DC-DC Outputs

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX1672

1.8

1.25

5.5

3.3

Preset

Resistor

0.26

Internal

Yes

QSOP/16

$3.16 @1k

See All Step-Down Switching Regulators (404)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

MAX1672EVKIT: Evaluation Kit for the MAX1672

Technical Documents

App Note 1763 Dual-Voltage Supply Powers SIM Card

Quality and Environmental Data

Product Reliability Reports: MAX1672.pdf
Lead-Free Package Tin (Sn) Whisker Reports

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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