MAX1556 Datasheet | Maxim Integrated

Description Features - Up to 97% Efficiency - 95% Efficiency at 1m A Load Current - Low 16µA Quiescent Current - 1MHz PWM Switching - Tiny 3.3µH Inductor - Selectable 3.3V, 2.5V, 1.8V, 1.5V, 1.3V, 1.0V, and Adjustable Output - 1.2A Guaranteed Output Current (MAX1556) - Voltage Positioning Optimizes Load-Transient Response - Low 27µA Quiescent Current in Dropout - Low 0.1µA Shutdown Current - No External Schottky Diode Required - Analog Soft-Start with Zero Overshoot Current - Small, 10-Pin, 3mm x 3mm TDFN Package MAX1556/MAX1557 The MAX1556/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/Ni MH 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 600m A; has pin-selectable 1V, 1.3V, and 1.5V outputs; and is also adjustable. The MAX1556/MAX1557 contain a low-on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and dropout performance while minimizing external ponent count. A proprietary topology offers the benefits of a high fixed-frequency operation while still providing excellent efficiency at both light and full loads. A 1MHz PWM switching frequency keeps ponents small. Both devices also feature an adjustable soft-start to minimize battery transient loading. The MAX1556/MAX1557 are available in a tiny 10-pin TDFN (3mm x 3mm) package. Applications PDAs and Palmtop puters Cell Phones and Smart Phones Digital Cameras and Camcorders Portable MP3 and DVD Players Hand-Held Instruments MAX1557ETB MAX1556ETB PART Ordering Information TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 10 TDFN-EP- (T1033-1) 10 TDFN-EP- (T1033-1) TOP MARK ACQ ACR - EP = Exposed paddle. Typical Operating Circuit INPUT 2.6V TO 5.5V...