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MAX1556ETB+ Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1556ETB+ Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 12 page General Description The MAX1556/MAX1556A/MAX1557 are low-operating- current (16µA), fixed-frequency step-down regulators. High efficiency, low-quiescent operating current, low dropout, and minimal (27µA) quiescent current in dropout make these converters ideal for powering portable devices from 1-cell Li-ion or 3-cell alkaline/NiMH batteries. The MAX1556 delivers up to 1.2A; has pin- selectable 1.8V, 2.5V, and 3.3V outputs; and is also adjustable. The MAX1557 delivers up to 600mA; has pin- selectable 1V, 1.3V, and 1.5V outputs; and is also adjustable. The MAX1556/MAX1556A/MAX1557 contain a low-on- resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and dropout perfor- mance while minimizing external component count. A proprietary topology offers the benefits of a high fixed- frequency operation while still providing excellent effi- ciency at both light and full loads. A 1MHz PWM switching frequency keeps components small. Both devices also feature an adjustable soft-start to minimize battery transient loading. The MAX1556/MAX1556A/MAX1557 are available in a tiny 10-pin TDFN (3mm x 3mm) package. Applications PDAs and Palmtop Computers Cell Phones and Smart Phones Digital Cameras and Camcorders Portable MP3 and DVD Players Hand-Held Instruments Features o Up to 97% Efficiency o 95% Efficiency at 1mA Load Current o Low 16µA Quiescent Current o 1MHz PWM Switching o Tiny 3.3µH Inductor o Selectable 3.3V, 2.5V, 1.8V, 1.5V, 1.3V, 1.2V, 1.0V, and Adjustable Output o 1.2A Guaranteed Output Current (MAX1556/MAX1556A) o Voltage Positioning Optimizes Load-Transient Response o Low 27µA Quiescent Current in Dropout o Low 0.1µA Shutdown Current o No External Schottky Diode Required o Analog Soft-Start with Zero Overshoot Current o Small, 10-Pin, 3mm x 3mm TDFN Package 16µA IQ, 1.2A PWM Step-Down DC-DC Converters ________________________________________________________________ Maxim Integrated Products 1 TOP VIEW LX OUT SHDN 6 7 8 9 10 INP D1 3 2 1 SS GND IN 5 PGND D2 4 TDFN MAX1556 MAX1556A MAX1557 Pin Configuration Ordering Information LX SS ON OFF SHDN GND INPUT 2.6V TO 5.5V VOLTAGE SELECT OUTPUT 0.75V TO VIN PGND OUT INP IN D1 D2 MAX1556 MAX1556A MAX1557 Typical Operating Circuit 19-3336; Rev 2; 6/10 EVALUATION KIT AVAILABLE PART TEMP RANGE PIN-PACKAGE TOP MARK MAX1556ETB+ -40 °C to +85°C 10 TDFN-EP* ACQ MAX1556AETB+ -40 °C to +85°C 10 TDFN-EP* AUJ MAX1557ETB+ -40 °C to +85°C 10 TDFN-EP* ACR * EP = Exposed paddle. + Denotes a lead(Pb)-free/RoHS-compliant package. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. |
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