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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
Notes and Comments
30V/0.5A internal switch, low supply current
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Information Index
Document Ref.: 19-1219
Rev 1;
1997-06-01
This page last modified: 2007-06-01
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