Purchase MAX1921, In-stock MAX1921 From SeekIC.
Part Number: MAX1921
Description: The MAX1920/MAX1921 step-down converters deliver over 400mA to outputs as low as 1.25V. These converte...
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MAX1921
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General Description
MAX1921 General Description
The MAX1920/MAX1921 step-down converters deliver over 400mA 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 (50A), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination makes the MAX1920/MAX1921 excellent highefficiency alternatives to linear regulators in spaceconstrained 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 MAX1920 provides an adjustable output voltage (1.25V to 4V). The MAX1921 provides factory-preset output voltages (see the Selector Guide). Both are available in space-saving 6-pin SOT23 packages.
MAX1921 Maximum Ratings
IN, FB, SHDN to AGND . . . . . . . . . . . . . . . . . . . . .-0.3V to +6V
OUT to AGND, LX to PGND . . . . . . . . . .. . .-0.3V to (IN + 0.3V)
AGND to PGND . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to +0.3V
OUT Short Circuit to GND . . . . . . . . . . . . . . . . . . . . . . . . . .10s
Continuous Power Dissipation (TA = +70)
6-Pin SOT23-6 (derate 8.7mW/ above +70) . . .. . .695mW
Operating Temperature Range . . . . . . . . . . . . .-40 to +85
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . .+150
Storage Temperature . . . . . . . . . . . . . . . . . . .-65 to +150
Lead Temperature (soldering 10s) . . . . . . . . . . . . . . . .+300
OUT to AGND, LX to PGND . . . . . . . . . .. . .-0.3V to (IN + 0.3V)
AGND to PGND . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to +0.3V
OUT Short Circuit to GND . . . . . . . . . . . . . . . . . . . . . . . . . .10s
Continuous Power Dissipation (TA = +70)
6-Pin SOT23-6 (derate 8.7mW/ above +70) . . .. . .695mW
Operating Temperature Range . . . . . . . . . . . . .-40 to +85
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . .+150
Storage Temperature . . . . . . . . . . . . . . . . . . .-65 to +150
Lead Temperature (soldering 10s) . . . . . . . . . . . . . . . .+300
MAX1921 Features
`400mA Guaranteed Output Current
`Internal Synchronous Rectifier for >90% Efficiency
`Tiny 6-Pin SOT23 Package
`Up to 1.2MHz Switching Frequency for Small External Components
`50A Quiescent Supply Current
` 0.1A Logic-Controlled Shutdown
`2V to 5.5V Input Range
`Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output Voltages (MAX1921)
`Adjustable Output Voltage (MAX1920)
`±1.5% Initial Accuracy
`Soft-Start Limits Startup Current
`Internal Synchronous Rectifier for >90% Efficiency
`Tiny 6-Pin SOT23 Package
`Up to 1.2MHz Switching Frequency for Small External Components
`50A Quiescent Supply Current
` 0.1A Logic-Controlled Shutdown
`2V to 5.5V Input Range
`Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output Voltages (MAX1921)
`Adjustable Output Voltage (MAX1920)
`±1.5% Initial Accuracy
`Soft-Start Limits Startup Current
MAX1921 Typical Application
Next-Generation Wireless Handsets
PDAs, Palmtops, and Handy-Terminals
Battery-Powered Equipment
CDMA Power Amplifier Supply
PDAs, Palmtops, and Handy-Terminals
Battery-Powered Equipment
CDMA Power Amplifier Supply
MAX1921 Connection Diagram
MAX1921
PDF/DataSheet Download
- Datasheet: MAX1921
- File Size: 95757 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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