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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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Status
Active: In Production.
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.
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Data Sheet
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An evaluation kit is available: MAX1672EVKIT
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 (VIN > 2.5V)
- 150mA at 5V (VIN > 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
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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
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Key Specifications:
| Step-Down Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Preset VOUT
(V) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≤ |
max w/pins |
See Notes |
| MAX1672 |
1.8 |
11 |
1.25 |
5.5 |
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0.26 |
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1 |
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30.9 |
$2.94 @1k |
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See All Step-Down Switching Regulators (288)
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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 prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
Application Notes
Reliability Reports
| Show FIT data for: |
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| Request Reliability Report for: |
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Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1672C/D
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Active |
DICE SALES;NA pin;DICE;
Land Pattern: Not Applicable
Use pkgcode/variation: DICE*
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See data sheet
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| MAX1672EEE
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-5*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1672EEE+
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+5*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1672EEE+T
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+5*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1672EEE-T
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Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-5*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Notes and Comments
Step-up/step-down converter, wide input voltage range
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Evaluation Kits
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Information Index
Document Ref.: 19-1307
Rev 2;
2002-12-10
This page last modified: 2007-07-19
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