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MAX1626, MAX1627
5V/3.3V or Adjustable, 100% Duty Cycle, High-Efficiency, Step-Down DC-DC Controllers
Efficient, Low-Cost, Step-Down Controllers Ideally Suitable for 1.5V CPU I/O Power
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Status
Active: In Production.
Description
The MAX1626/MAX1627 step-down DC-DC switching controllers provide high efficiency over loads ranging from 1mA to more than 2A. A unique current-limited, pulse-frequency-modulated (PFM) control scheme operates with up to a 100% duty cycle, resulting in very low dropout voltages. This control scheme eliminates minimum load requirements and reduces the supply current under light loads to 90µA (versus 2mA to 10mA for common pulse-width modulation controllers).
These step-down controllers drive an external P-channel MOSFET, allowing design flexibility for applications to 12W or higher. Soft-start reduces current surges during start-up. A high switching frequency (up to 300kHz) and operation in continuous-conduction mode allow the use of tiny surface-mount inductors. Output capacitor requirements are also reduced, minimizing PC board area and system costs.
The output voltage is preset at 5V or 3.3V for the MAX1626 and adjustable for the MAX1627. Input voltages can be up to 16.5V. The MAX1626/MAX1627 are functional upgrades for the MAX1649/MAX1651.
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Data Sheet
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An evaluation kit is available: MAX1626EVKIT
Key Features
- Low Dropout Voltage
- 100% Maximum Duty Cycle
- Soft-Start Limits Start-Up Current
- Efficiency >90% (3mA to 2A Loads)
- Output Power >12.5W
- 90µA Max Quiescent Current
- 1µA Max Shutdown Current
- Up to 300kHz Switching Frequency
- 16.5V Max Input Voltage
- Output Voltage:
- 5V/3.3V (MAX1626)
- Adjustable (MAX1627)
- Current-Limited Control Scheme
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Applications/Uses
- 5V to 3.3V Green PC Applications
- Battery-Powered Applications
- Handheld Computers
- High-Efficiency Step-Down Regulation
- Low-Cost Notebook Computer Supplies
- Minimum Component DC-DC Converters
- PCMCIA Power Supplies
- PDAs and Other Handheld Devices
- Portable Terminals
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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) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≥ |
≤ |
max w/pins |
See Notes |
| MAX1626 |
3 |
16.5 |
3.3 |
5 |
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3 |
3 |
Preset |
1 |
300 |
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30.9 |
$1.50 @1k |
| MAX1627 |
1.3 |
16 |
- |
Resistor |
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$1.50 @1k |
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See All Step-Down Switching Regulators (284)
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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
Functional upgrades for MAX1649/ MAX1651, with 100% duty cycle, high efficiency
Didn't Find What You Need?
Information Index
Document Ref.: 19-1075
Rev 0;
1996-06-01
This page last modified: 2007-07-17
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