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MAX1733, MAX1734
Low-Voltage, Step-Down DC-DC Converters in SOT23
High-Efficiency DC-DC Solution for Low-Voltage Logic Supplies
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Status
Active: In Production.
Description
The MAX1733/MAX1734 step-down DC-DC converters deliver over 250mA to outputs as low as 1.25V. These converters use a unique proprietary current-limited control scheme that achieves over 90% efficiency. These devices maintain extremely low quiescent supply current (40µA), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination of features makes the MAX1733/ MAX1734 excellent high-efficiency alternatives to linear regulators in space-constrained applications.
Internal synchronous rectification greatly improves efficiency and eliminates the external Schottky diode required in conventional step-down converters. Both devices also include internal digital soft-start to limit input current upon startup and reduce input capacitor requirements.
The MAX1733 provides an adjustable output voltage (1.25V to 2.0V). The MAX1734 provides factory-preset output voltages (see Selector Guide). Both are available in space-saving 5-pin SOT23 packages.
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Data Sheet
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An evaluation kit is available: MAX1734EVKIT
Key Features
- 250mA Guaranteed Output Current
- Synchronous Rectifier for Over 90% Efficiency
- Tiny 5-Pin SOT23 Package
- 40µA Quiescent Supply Current
- 0.01µA Logic-Controlled Shutdown
- Up to 1.2MHz Switching Frequency
- Fixed 1.8V or 1.5V Outputs (MAX1734)
- Adjustable Output Voltage (MAX1733)
- ±1.5% Initial Accuracy
- 2.7V to 5.5V Input Range
- Soft-Start Limits Startup Current
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Applications/Uses
- Cell Phones
- Computers: Desktop, Workstation, Server
- Consumer Audio
- Digital Still Cameras
- Global Positioning Systems (GPS)
- Palmtop Computers
- POS Terminals
- Wireless Data
- Wireless Local Area Networks (WLANs)
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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 |
| MAX1733 |
2.7 |
5.5 |
1.25 |
2 |
- |
0.25 |
0.25 |
Resistor |
1 |
1200 |
|
9 |
$1.89 @1k |
| MAX1734 |
1.5 |
1.8 |
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$1.89 @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
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-1586
Rev 0;
2000-09-15
This page last modified: 2007-06-06
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