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MAX629
28V, Low-Power, High-Voltage, Boost or Inverting DC-DC Converter
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Status
Active: In Production.
Description
The MAX629 low-power DC-DC converter features an internal N-channel MOSFET switch and programmable current limiting. It is designed to supply positive or negative bias voltages up to ±28V from input voltages in the 0.8V to VOUT range, and can be configured for boost, flyback, and SEPIC topologies.
The MAX629's current-limited pulse-frequency-modulation (PFM) control scheme provides high efficiency over a wide range of load conditions. An internal, 0.5A N-channel MOSFET switch reduces the total part count, and a high switching frequency (up to 300kHz) allows for tiny surface-mount magnetics.
The MAX629's combination of low supply current, logic-controlled shutdown, small package, and tiny external components makes it an extremely compact and efficient high-voltage biasing solution that's ideal for battery-powered applications. The MAX629 is available in an 8-pin SO package.
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Data Sheet
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An evaluation kit is available: MAX629EVKIT
Key Features
- Internal, 500mA, 28V N-Channel Switch (No External FET Required)
- Generates Positive or Negative Output Voltages
- 80µA Supply Current
- 1µA Max Shutdown Current
- Up to 300kHz Switching Frequency
- Adjustable Current Limit Allows Use of Small, Inexpensive Inductors
- 8-Pin SO Package
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Applications/Uses
- 2-Cell and 3-Cell Battery-Powered Applications
- High-Efficiency DC-DC Boost Converters
- Palmtop Computers
- Positive or Negative LCD Bias Generators
- Varactor Tuning Diode Bias
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Key Specifications:
| Inverting Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
Max. IOUT
(A) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Alternate Topology |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
≥ |
≤ |
max w/pins |
See Notes |
| MAX629 |
2.7 |
5.5 |
0.5 |
0.5 |
Resistor |
1 |
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300 |
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30.9 |
$3.16 @1k |
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See All Inverting Switching Regulators (25)
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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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| Step-Up Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
Max. IOUT
(A) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
≥ |
≤ |
max w/pins |
See Notes |
| MAX629 |
2.7 |
5.5 |
0.5 |
0.5 |
Resistor |
1 |
300 |
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30.9 |
$3.16 @1k |
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See All Step-Up Switching Regulators (95)
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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
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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| MAX629C/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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| MAX629ESA
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Active |
SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX629ESA+
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Active |
SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX629ESA+G071
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Active |
N.SO;
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX629ESA+T
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Active |
SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX629ESA+TG071
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Active |
SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX629ESA-T
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Active |
SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8-4*
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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
30V/0.5A internal switch, low supply current
Similar Products by Function
| MAX686 |
DAC-Controlled Boost Inverter LCD Bias Supply with Internal Switch |
| MAX1620, MAX1621 |
Digitally Adjustable LCD Bias Supplies |
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Evaluation Kits
Products with Similar Part Numbers
Didn't Find What You Need?
Information Index
Document Ref.: 19-1219
Rev 1;
1997-06-01
This page last modified: 2007-06-01
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